Add collaboration feature

Issue-ID: SDC-767
Change-Id: I14fb4c1f54086ed03a56a7ff7fab9ecd40381795
Signed-off-by: talig <talig@amdocs.com>

33 files changed, 2248 insertions, 391 deletions

diff --git a/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/ElementRepository.java b/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/ElementRepository.java
index 967814c4d8..7681327e40 100644
--- a/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/ElementRepository.java
+++ b/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/ElementRepository.java
@@ -1,15 +1,18 @@
 package org.openecomp.core.zusammen.plugin.dao;
 
+import com.amdocs.zusammen.datatypes.Id;
 import com.amdocs.zusammen.datatypes.SessionContext;
 import com.amdocs.zusammen.plugin.statestore.cassandra.dao.types.ElementEntityContext;
 import org.openecomp.core.zusammen.plugin.dao.types.ElementEntity;
 
-import java.util.Collection;
+import java.util.Map;
 import java.util.Optional;
 
 public interface ElementRepository {
 
-  Collection<ElementEntity> list(SessionContext context, ElementEntityContext elementContext);
+  Map<Id,Id> listIds(SessionContext context, ElementEntityContext elementContext);
+
+/*  void createVersionData(SessionContext context, ElementEntityContext elementContext, VersionDataElement element);*/
 
   void create(SessionContext context, ElementEntityContext elementContext, ElementEntity element);
 
@@ -20,8 +23,28 @@ public interface ElementRepository {
   Optional<ElementEntity> get(SessionContext context, ElementEntityContext elementContext,
                               ElementEntity element);
 
+  Optional<ElementEntity> getDescriptor(SessionContext context, ElementEntityContext elementContext,
+                                        ElementEntity element);
+
   void createNamespace(SessionContext context, ElementEntityContext elementContext,
                        ElementEntity element);
 
-  boolean checkHealth(SessionContext context);
+  Optional<Id> getHash(SessionContext context, ElementEntityContext elementEntityContext,
+               ElementEntity element);
+
+
+
+
+/*  Collection<SynchronizationStateEntity> listSynchronizationStates(SessionContext context,
+                                              ElementEntityContext elementContext);
+
+  void updateSynchronizationState(SessionContext context, ElementEntityContext elementContext,
+              SynchronizationStateEntity elementSyncState);
+
+  void markAsDirty(SessionContext context, ElementEntityContext elementContext,
+                   SynchronizationStateEntity elementSyncState);
+
+  Optional<SynchronizationStateEntity> getSynchronizationState(SessionContext context,
+                                           ElementEntityContext elementContext,
+                                           SynchronizationStateEntity elementSyncState);*/
 }
diff --git a/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/ElementStageRepository.java b/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/ElementStageRepository.java
new file mode 100644
index 0000000000..ac3dc4e4bf
--- /dev/null
+++ b/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/ElementStageRepository.java
@@ -0,0 +1,34 @@
+package org.openecomp.core.zusammen.plugin.dao;
+
+import com.amdocs.zusammen.datatypes.SessionContext;
+import com.amdocs.zusammen.datatypes.item.Action;
+import com.amdocs.zusammen.plugin.statestore.cassandra.dao.types.ElementEntityContext;
+import org.openecomp.core.zusammen.plugin.dao.types.ElementEntity;
+import org.openecomp.core.zusammen.plugin.dao.types.StageEntity;
+
+import java.util.Collection;
+import java.util.Optional;
+
+public interface ElementStageRepository
+    extends StageRepository<ElementEntityContext, ElementEntity> {
+
+  Optional<StageEntity<ElementEntity>> getDescriptor(SessionContext context,
+                                                     ElementEntityContext elementContext,
+                                                     ElementEntity element);
+
+  Collection<ElementEntity> listIds(SessionContext context,
+                                    ElementEntityContext elementContext);
+
+  Collection<ElementEntity> listConflictedIds(SessionContext context,
+                                              ElementEntityContext elementContext);
+
+  void markAsNotConflicted(SessionContext context, ElementEntityContext entityContext,
+                           ElementEntity entity, Action action);
+
+  void markAsNotConflicted(SessionContext context, ElementEntityContext entityContext,
+                           ElementEntity entity);
+
+  void update(SessionContext context, ElementEntityContext entityContext, ElementEntity entity,
+              Action action, boolean conflicted);
+
+}
diff --git a/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/ElementStageRepositoryFactory.java b/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/ElementStageRepositoryFactory.java
new file mode 100644
index 0000000000..1e41308ff2
--- /dev/null
+++ b/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/ElementStageRepositoryFactory.java
@@ -0,0 +1,14 @@
+package org.openecomp.core.zusammen.plugin.dao;
+
+import com.amdocs.zusammen.datatypes.SessionContext;
+import com.amdocs.zusammen.utils.facade.api.AbstractComponentFactory;
+import com.amdocs.zusammen.utils.facade.api.AbstractFactory;
+
+public abstract class ElementStageRepositoryFactory
+    extends AbstractComponentFactory<ElementStageRepository> {
+  public static ElementStageRepositoryFactory getInstance() {
+    return AbstractFactory.getInstance(ElementStageRepositoryFactory.class);
+  }
+
+  public abstract ElementStageRepository createInterface(SessionContext context);
+}
diff --git a/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/ElementSynchronizationStateRepository.java b/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/ElementSynchronizationStateRepository.java
new file mode 100644
index 0000000000..53c029bb6f
--- /dev/null
+++ b/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/ElementSynchronizationStateRepository.java
@@ -0,0 +1,21 @@
+package org.openecomp.core.zusammen.plugin.dao;
+
+import com.amdocs.zusammen.datatypes.SessionContext;
+import com.amdocs.zusammen.plugin.statestore.cassandra.dao.types.ElementEntityContext;
+import org.openecomp.core.zusammen.plugin.dao.types.SynchronizationStateEntity;
+
+import java.util.Collection;
+
+public interface ElementSynchronizationStateRepository
+    extends SynchronizationStateRepository<ElementEntityContext> {
+
+  Collection<SynchronizationStateEntity> list(SessionContext context,
+                                              ElementEntityContext elementContext);
+
+  void update(SessionContext context, ElementEntityContext entityContext,
+              SynchronizationStateEntity syncStateEntity);
+
+  void markAsDirty(SessionContext context, ElementEntityContext entityContext,
+                   SynchronizationStateEntity syncStateEntity);
+
+}
diff --git a/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/ElementSynchronizationStateRepositoryFactory.java b/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/ElementSynchronizationStateRepositoryFactory.java
new file mode 100644
index 0000000000..26f3bb4f56
--- /dev/null
+++ b/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/ElementSynchronizationStateRepositoryFactory.java
@@ -0,0 +1,14 @@
+package org.openecomp.core.zusammen.plugin.dao;
+
+import com.amdocs.zusammen.datatypes.SessionContext;
+import com.amdocs.zusammen.utils.facade.api.AbstractComponentFactory;
+import com.amdocs.zusammen.utils.facade.api.AbstractFactory;
+
+public abstract class ElementSynchronizationStateRepositoryFactory
+    extends AbstractComponentFactory<ElementSynchronizationStateRepository> {
+  public static ElementSynchronizationStateRepositoryFactory getInstance() {
+    return AbstractFactory.getInstance(ElementSynchronizationStateRepositoryFactory.class);
+  }
+
+  public abstract ElementSynchronizationStateRepository createInterface(SessionContext context);
+}
diff --git a/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/StageRepository.java b/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/StageRepository.java
new file mode 100644
index 0000000000..98b0d8242c
--- /dev/null
+++ b/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/StageRepository.java
@@ -0,0 +1,15 @@
+package org.openecomp.core.zusammen.plugin.dao;
+
+import com.amdocs.zusammen.datatypes.SessionContext;
+import org.openecomp.core.zusammen.plugin.dao.types.StageEntity;
+
+import java.util.Optional;
+
+public interface StageRepository<C, E> {
+
+  Optional<StageEntity<E>> get(SessionContext context, C entityContext, E entity);
+
+  void create(SessionContext context, C entityContext, StageEntity<E> stageEntity);
+
+  void delete(SessionContext context, C entityContext, E entity);
+}
diff --git a/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/SynchronizationStateRepository.java b/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/SynchronizationStateRepository.java
new file mode 100644
index 0000000000..f227b0c925
--- /dev/null
+++ b/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/SynchronizationStateRepository.java
@@ -0,0 +1,16 @@
+package org.openecomp.core.zusammen.plugin.dao;
+
+import com.amdocs.zusammen.datatypes.SessionContext;
+import org.openecomp.core.zusammen.plugin.dao.types.SynchronizationStateEntity;
+
+import java.util.Optional;
+
+public interface SynchronizationStateRepository<C> {
+
+  void create(SessionContext context, C entityContext, SynchronizationStateEntity syncStateEntity);
+
+  void delete(SessionContext context, C entityContext, SynchronizationStateEntity syncStateEntity);
+
+  Optional<SynchronizationStateEntity> get(SessionContext context, C entityContext,
+                                           SynchronizationStateEntity syncStateEntity);
+}
diff --git a/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/VersionDao.java b/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/VersionDao.java
new file mode 100644
index 0000000000..f8ad0405b2
--- /dev/null
+++ b/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/VersionDao.java
@@ -0,0 +1,29 @@
+package org.openecomp.core.zusammen.plugin.dao;
+
+
+import com.amdocs.zusammen.datatypes.Id;
+import com.amdocs.zusammen.datatypes.SessionContext;
+import org.openecomp.core.zusammen.plugin.dao.types.VersionEntity;
+
+import java.util.Collection;
+import java.util.Date;
+import java.util.Map;
+import java.util.Optional;
+
+public interface VersionDao {
+  Collection<VersionEntity> list(SessionContext context, String space, Id itemId);
+
+  Optional<VersionEntity> get(SessionContext context, String space, Id itemId, Id versionId);
+
+  void create(SessionContext context, String space, Id itemId, VersionEntity version);
+
+  void updateModificationTime(SessionContext context, String space, Id itemId, Id versionId, Date modificationTime);
+
+  void delete(SessionContext context, String space, Id itemId, Id versionId);
+
+  boolean checkHealth(SessionContext context);
+
+  void createVersionElements(SessionContext context, String publicSpace, Id itemId, Id versionId,
+                             Id revisionId, Map<Id, Id> versionElementIds, Date publishTime,
+                             String message);
+}
diff --git a/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/VersionDaoFactory.java b/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/VersionDaoFactory.java
new file mode 100644
index 0000000000..2847959f8f
--- /dev/null
+++ b/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/VersionDaoFactory.java
@@ -0,0 +1,13 @@
+package org.openecomp.core.zusammen.plugin.dao;
+
+import com.amdocs.zusammen.datatypes.SessionContext;
+import com.amdocs.zusammen.utils.facade.api.AbstractComponentFactory;
+import com.amdocs.zusammen.utils.facade.api.AbstractFactory;
+
+public abstract class VersionDaoFactory extends AbstractComponentFactory<VersionDao> {
+  public static VersionDaoFactory getInstance() {
+    return AbstractFactory.getInstance(VersionDaoFactory.class);
+  }
+
+  public abstract VersionDao createInterface(SessionContext context);
+}
diff --git a/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/VersionStageRepository.java b/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/VersionStageRepository.java
new file mode 100644
index 0000000000..568e0c9d2b
--- /dev/null
+++ b/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/VersionStageRepository.java
@@ -0,0 +1,9 @@
+package org.openecomp.core.zusammen.plugin.dao;
+
+
+import org.openecomp.core.zusammen.plugin.dao.types.VersionContext;
+import org.openecomp.core.zusammen.plugin.dao.types.VersionEntity;
+
+public interface VersionStageRepository extends StageRepository<VersionContext, VersionEntity> {
+
+}
diff --git a/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/VersionStageRepositoryFactory.java b/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/VersionStageRepositoryFactory.java
new file mode 100644
index 0000000000..fc9e7725eb
--- /dev/null
+++ b/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/VersionStageRepositoryFactory.java
@@ -0,0 +1,13 @@
+package org.openecomp.core.zusammen.plugin.dao;
+
+import com.amdocs.zusammen.datatypes.SessionContext;
+import com.amdocs.zusammen.utils.facade.api.AbstractComponentFactory;
+import com.amdocs.zusammen.utils.facade.api.AbstractFactory;
+
+public abstract class VersionStageRepositoryFactory extends AbstractComponentFactory<VersionStageRepository> {
+  public static VersionStageRepositoryFactory getInstance() {
+    return AbstractFactory.getInstance(VersionStageRepositoryFactory.class);
+  }
+
+  public abstract VersionStageRepository createInterface(SessionContext context);
+}
diff --git a/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/VersionSynchronizationStateRepository.java b/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/VersionSynchronizationStateRepository.java
new file mode 100644
index 0000000000..9134392d3b
--- /dev/null
+++ b/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/VersionSynchronizationStateRepository.java
@@ -0,0 +1,18 @@
+package org.openecomp.core.zusammen.plugin.dao;
+
+import com.amdocs.zusammen.datatypes.SessionContext;
+import org.openecomp.core.zusammen.plugin.dao.types.SynchronizationStateEntity;
+import org.openecomp.core.zusammen.plugin.dao.types.VersionContext;
+import org.openecomp.core.zusammen.plugin.dao.types.VersionEntity;
+
+import java.util.List;
+
+public interface VersionSynchronizationStateRepository
+    extends SynchronizationStateRepository<VersionContext> {
+
+  void updatePublishTime(SessionContext context, VersionContext entityContext,
+                         SynchronizationStateEntity syncStateEntity);
+
+  List<SynchronizationStateEntity> list(SessionContext context, VersionContext entityContext,
+                                                  VersionEntity versionEntity);
+}
diff --git a/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/VersionSynchronizationStateRepositoryFactory.java b/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/VersionSynchronizationStateRepositoryFactory.java
new file mode 100644
index 0000000000..dfedb5897b
--- /dev/null
+++ b/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/VersionSynchronizationStateRepositoryFactory.java
@@ -0,0 +1,14 @@
+package org.openecomp.core.zusammen.plugin.dao;
+
+import com.amdocs.zusammen.datatypes.SessionContext;
+import com.amdocs.zusammen.utils.facade.api.AbstractComponentFactory;
+import com.amdocs.zusammen.utils.facade.api.AbstractFactory;
+
+public abstract class VersionSynchronizationStateRepositoryFactory
+    extends AbstractComponentFactory<VersionSynchronizationStateRepository> {
+  public static VersionSynchronizationStateRepositoryFactory getInstance() {
+    return AbstractFactory.getInstance(VersionSynchronizationStateRepositoryFactory.class);
+  }
+
+  public abstract VersionSynchronizationStateRepository createInterface(SessionContext context);
+}
diff --git a/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/impl/CassandraElementRepository.java b/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/impl/CassandraElementRepository.java
deleted file mode 100644
index 6cc1350444..0000000000
--- a/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/impl/CassandraElementRepository.java
+++ /dev/null
@@ -1,375 +0,0 @@
-/*
- * Copyright © 2016-2017 European Support Limited
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.openecomp.core.zusammen.plugin.dao.impl;
-
-import com.amdocs.zusammen.datatypes.Id;
-import com.amdocs.zusammen.datatypes.Namespace;
-import com.amdocs.zusammen.datatypes.SessionContext;
-import com.amdocs.zusammen.datatypes.item.Info;
-import com.amdocs.zusammen.datatypes.item.Relation;
-import com.amdocs.zusammen.plugin.statestore.cassandra.dao.types.ElementEntityContext;
-import com.amdocs.zusammen.utils.fileutils.json.JsonUtil;
-import com.datastax.driver.core.ResultSet;
-import com.datastax.driver.core.Row;
-import com.datastax.driver.mapping.annotations.Accessor;
-import com.datastax.driver.mapping.annotations.Param;
-import com.datastax.driver.mapping.annotations.Query;
-import com.google.gson.reflect.TypeToken;
-import org.openecomp.core.zusammen.plugin.dao.ElementRepository;
-import org.openecomp.core.zusammen.plugin.dao.types.ElementEntity;
-
-import java.lang.reflect.Type;
-import java.nio.ByteBuffer;
-import java.util.ArrayList;
-import java.util.Collection;
-import java.util.Collections;
-import java.util.HashSet;
-import java.util.Optional;
-import java.util.Set;
-import java.util.stream.Collectors;
-
-public class CassandraElementRepository implements ElementRepository {
-
-  private static final String VERSION_ELEMENT_NOT_EXIST_ERROR_MSG =
-      "List version elements error: " +
-          "element %s, which appears as an element of item %s version %s, does not exist";
-
-  @Override
-  public Collection<ElementEntity> list(SessionContext context,
-                                        ElementEntityContext elementContext) {
-    Set<String> elementIds = getVersionElementIds(context, elementContext);
-
-    Collection<ElementEntity> elements = new ArrayList<>();
-    for (String elementId : elementIds) {
-      elements.add(get(context, elementContext, new ElementEntity(new Id(elementId)))
-          .orElseThrow(
-              () -> new IllegalStateException(String.format(VERSION_ELEMENT_NOT_EXIST_ERROR_MSG,
-                  elementId, elementContext.getItemId().getValue(),
-                  getVersionId(elementContext)))));
-    }
-    return elements;
-  }
-
-  @Override
-  public void create(SessionContext context, ElementEntityContext elementContext,
-                     ElementEntity element) {
-    createElement(context, elementContext, element);
-    addElementToParent(context, elementContext, element);
-  }
-
-  @Override
-  public void update(SessionContext context, ElementEntityContext elementContext,
-                     ElementEntity element) {
-    updateElement(context, elementContext, element);
-  }
-
-  @Override
-  public void delete(SessionContext context, ElementEntityContext elementContext,
-                     ElementEntity element) {
-    removeElementFromParent(context, elementContext, element);
-    deleteElement(context, elementContext, element);
-  }
-
-  @Override
-  public Optional<ElementEntity> get(SessionContext context, ElementEntityContext elementContext,
-                                     ElementEntity element) {
-    Row row = getElementAccessor(context).get(
-        elementContext.getSpace(),
-        elementContext.getItemId().toString(),
-        getVersionId(elementContext),
-        element.getId().toString()).one();
-
-    return row == null ? Optional.empty() : Optional.of(getElementEntity(element, row));
-  }
-
-  @Override
-  public void createNamespace(SessionContext context, ElementEntityContext elementContext,
-                              ElementEntity element) {
-    getElementNamespaceAccessor(context).create(
-        elementContext.getSpace(),
-        elementContext.getItemId().toString(),
-        element.getId().toString(),
-        element.getNamespace().toString());
-  }
-
-  @Override
-  public boolean checkHealth(SessionContext context) {
-    ResultSet resultSet = getVersionElementsAccessor(context).checkHealth();
-    return resultSet.getColumnDefinitions().contains("element_ids");
-  }
-
-  private String getVersionId(ElementEntityContext elementContext) {
-    return elementContext.getChangeRef() == null
-        ? elementContext.getVersionId().toString()
-        : elementContext.getChangeRef();
-  }
-
-  private ElementNamespaceAccessor getElementNamespaceAccessor(SessionContext context) {
-    return CassandraDaoUtils.getAccessor(context, ElementNamespaceAccessor.class);
-  }
-
-  private ElementAccessor getElementAccessor(SessionContext context) {
-    return CassandraDaoUtils.getAccessor(context, ElementAccessor.class);
-  }
-
-  private VersionElementsAccessor getVersionElementsAccessor(SessionContext context) {
-    return CassandraDaoUtils.getAccessor(context, VersionElementsAccessor.class);
-  }
-
-  private void createElement(SessionContext context, ElementEntityContext elementContext,
-                             ElementEntity element) {
-    Set<String> subElementIds =
-        element.getSubElementIds().stream().map(Id::toString).collect(Collectors.toSet());
-    String versionId = getVersionId(elementContext);
-
-    getElementAccessor(context).create(
-        elementContext.getSpace(),
-        elementContext.getItemId().toString(),
-        versionId,
-        element.getId().toString(),
-        element.getParentId().toString(),
-        element.getNamespace().toString(),
-        JsonUtil.object2Json(element.getInfo()),
-        JsonUtil.object2Json(element.getRelations()),
-        element.getData(),
-        element.getSearchableData(),
-        element.getVisualization(),
-        subElementIds);
-
-    getVersionElementsAccessor(context).addElements(
-        Collections.singleton(element.getId().toString()),
-        elementContext.getSpace(),
-        elementContext.getItemId().toString(),
-        versionId);
-  }
-
-  private void updateElement(SessionContext context, ElementEntityContext elementContext,
-                             ElementEntity element) {
-    getElementAccessor(context).update(
-        JsonUtil.object2Json(element.getInfo()),
-        JsonUtil.object2Json(element.getRelations()),
-        element.getData(),
-        element.getSearchableData(),
-        element.getVisualization(),
-        elementContext.getSpace(),
-        elementContext.getItemId().toString(),
-        elementContext.getVersionId().toString(),
-        element.getId().toString());
-  }
-
-  private void deleteElement(SessionContext context, ElementEntityContext elementContext,
-                             ElementEntity element) {
-    String versionId = getVersionId(elementContext);
-
-    getElementAccessor(context).delete(
-        elementContext.getSpace(),
-        elementContext.getItemId().toString(),
-        versionId,
-        element.getId().toString());
-
-    getVersionElementsAccessor(context).removeElements(
-        Collections.singleton(element.getId().toString()),
-        elementContext.getSpace(),
-        elementContext.getItemId().toString(),
-        versionId);
-  }
-
-  private void addElementToParent(SessionContext context, ElementEntityContext elementContext,
-                                  ElementEntity element) {
-    getElementAccessor(context).addSubElements(
-        Collections.singleton(element.getId().toString()),
-        elementContext.getSpace(),
-        elementContext.getItemId().toString(),
-        getVersionId(elementContext),
-        element.getParentId().toString());
-  }
-
-  private void removeElementFromParent(SessionContext context, ElementEntityContext elementContext,
-                                       ElementEntity element) {
-    if (element.getParentId() == null) {
-      return;
-    }
-    getElementAccessor(context).removeSubElements(
-        Collections.singleton(element.getId().toString()),
-        elementContext.getSpace(),
-        elementContext.getItemId().toString(),
-        getVersionId(elementContext),
-        element.getParentId().toString());
-  }
-
-  private ElementEntity getElementEntity(ElementEntity element, Row row) {
-    element.setNamespace(getNamespace(row.getString(ElementField.NAMESPACE)));
-    element.setParentId(new Id(row.getString(ElementField.PARENT_ID)));
-    element.setInfo(json2Object(row.getString(ElementField.INFO), Info.class));
-    element.setRelations(
-        json2Object(row.getString(ElementField.RELATIONS), new TypeToken<ArrayList<Relation>>() {
-        }.getType()));
-    element.setData(row.getBytes(ElementField.DATA));
-    element.setSearchableData(row.getBytes(ElementField.SEARCHABLE_DATA));
-    element.setVisualization(row.getBytes(ElementField.VISUALIZATION));
-    element.setSubElementIds(row.getSet(ElementField.SUB_ELEMENT_IDS, String.class)
-        .stream().map(Id::new).collect(Collectors.toSet()));
-    return element;
-  }
-
-  private Namespace getNamespace(String namespaceStr) {
-    Namespace namespace = new Namespace();
-    if (namespaceStr != null) {
-      namespace.setValue(namespaceStr);
-    }
-    return namespace;
-  }
-
-  private static <T> T json2Object(String json, Type typeOfT) {
-    return json == null ? null : JsonUtil.json2Object(json, typeOfT);
-  }
-
-  private Set<String> getVersionElementIds(SessionContext context,
-                                           ElementEntityContext elementContext) {
-    Row row = getVersionElementsAccessor(context).get(
-        elementContext.getSpace(),
-        elementContext.getItemId().toString(),
-        getVersionId(elementContext)).one();
-    return row == null
-        ? new HashSet<>()
-        : row.getSet(CassandraElementRepository.VersionElementsField.ELEMENT_IDS, String.class);
-  }
-
-  /*
-CREATE TABLE IF NOT EXISTS element_namespace (
-	space text,
-	item_id text,
-	element_id text,
-	namespace text,
-	PRIMARY KEY (( space, item_id, element_id ))
-);
-   */
-  @Accessor
-  interface ElementNamespaceAccessor {
-    @Query(
-        "UPDATE element_namespace SET namespace=:ns " +
-            "WHERE space=:space AND item_id=:item AND element_id=:id ")
-    void create(@Param("space") String space,
-                @Param("item") String itemId,
-                @Param("id") String elementId,
-                @Param("ns") String namespace);
-  }
-
-  /*
-CREATE TABLE IF NOT EXISTS element (
-	space text,
-	item_id text,
-	version_id text,
-	element_id text,
-	parent_id text,
-	namespace text,
-	info text,
-	relations text,
-	data blob,
-	searchable_data blob,
-	visualization blob,
-	sub_element_ids set<text>,
-	PRIMARY KEY (( space, item_id, version_id, element_id ))
-);
-   */
-  @Accessor
-  interface ElementAccessor {
-    @Query(
-        "UPDATE element SET parent_id=:parentId, namespace=:ns, info=:info, relations=:rels, " +
-            "data=:data, searchable_data=:searchableData, visualization=:visualization, " +
-            "sub_element_ids=sub_element_ids+:subs " +
-            "WHERE space=:space AND item_id=:item AND version_id=:ver AND element_id=:id ")
-    void create(@Param("space") String space,
-                @Param("item") String itemId,
-                @Param("ver") String versionId,
-                @Param("id") String elementId,
-                @Param("parentId") String parentElementId,
-                @Param("ns") String namespace,
-                @Param("info") String info,
-                @Param("rels") String relations,
-                @Param("data") ByteBuffer data,
-                @Param("searchableData") ByteBuffer searchableData,
-                @Param("visualization") ByteBuffer visualization,
-                @Param("subs") Set<String> subElementIds);
-
-    @Query("UPDATE element SET info=?, relations=?, data=?, searchable_data=?, visualization=?" +
-        " WHERE space=? AND item_id=? AND version_id=? AND element_id=?  ")
-    void update(String info, String relations, ByteBuffer data, ByteBuffer searchableData,
-                ByteBuffer visualization, String space, String itemId, String versionId,
-                String elementId);
-
-    @Query("DELETE FROM element WHERE space=? AND item_id=? AND version_id=? AND element_id=?")
-    void delete(String space, String itemId, String versionId, String elementId);
-
-    @Query("SELECT parent_id, namespace, info, relations, data, searchable_data, visualization, " +
-        "sub_element_ids FROM element " +
-        "WHERE space=? AND item_id=? AND version_id=? AND element_id=? ")
-    ResultSet get(String space, String itemId, String versionId, String elementId);
-
-    @Query("UPDATE element SET sub_element_ids=sub_element_ids+? " +
-        " WHERE space=? AND item_id=? AND version_id=? AND element_id=?  ")
-    void addSubElements(Set<String> subElementIds, String space, String itemId, String versionId,
-                        String elementId);
-
-    @Query("UPDATE element SET sub_element_ids=sub_element_ids-? " +
-        " WHERE space=? AND item_id=? AND version_id=? AND element_id=? ")
-    void removeSubElements(Set<String> subElementIds, String space, String itemId, String versionId,
-                           String elementId);
-  }
-
-  private static final class ElementField {
-    private static final String NAMESPACE = "namespace";
-    private static final String PARENT_ID = "parent_id";
-    private static final String INFO = "info";
-    private static final String RELATIONS = "relations";
-    private static final String DATA = "data";
-    private static final String SEARCHABLE_DATA = "searchable_data";
-    private static final String VISUALIZATION = "visualization";
-    private static final String SUB_ELEMENT_IDS = "sub_element_ids";
-  }
-
-  /*
-  CREATE TABLE IF NOT EXISTS version_elements (
-    space text,
-    item_id text,
-    version_id text,
-    element_ids set<text>,
-    PRIMARY KEY (( space, item_id, version_id ))
-  );
-   */
-  @Accessor
-  interface VersionElementsAccessor {
-
-    @Query("UPDATE version_elements SET element_ids=element_ids+? " +
-        "WHERE space=? AND item_id=? AND version_id=?")
-    void addElements(Set<String> elementIds, String space, String itemId, String versionId);
-
-    @Query("UPDATE version_elements SET element_ids=element_ids-? " +
-        "WHERE space=? AND item_id=? AND version_id=?")
-    void removeElements(Set<String> elementIds, String space, String itemId, String versionId);
-
-    @Query("SELECT element_ids FROM version_elements WHERE space=? AND item_id=? AND version_id=?")
-    ResultSet get(String space, String itemId, String versionId);
-
-    @Query("SELECT element_ids FROM version_elements LIMIT 1")
-    ResultSet checkHealth();
-  }
-
-  private static final class VersionElementsField {
-    private static final String ELEMENT_IDS = "element_ids";
-  }
-}
diff --git a/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/impl/CassandraDaoUtils.java b/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/impl/cassandra/CassandraDaoUtils.java
index 20a1e1803f..b6cb9e4070 100644
--- a/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/impl/CassandraDaoUtils.java
+++ b/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/impl/cassandra/CassandraDaoUtils.java
@@ -1,9 +1,9 @@
-package org.openecomp.core.zusammen.plugin.dao.impl;
+package org.openecomp.core.zusammen.plugin.dao.impl.cassandra;
 
-import com.datastax.driver.core.Session;
 import com.amdocs.zusammen.commons.db.api.cassandra.CassandraConnectorFactory;
 import com.amdocs.zusammen.commons.db.api.cassandra.types.CassandraContext;
 import com.amdocs.zusammen.datatypes.SessionContext;
+import com.datastax.driver.core.Session;
 
 class CassandraDaoUtils {
 
diff --git a/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/impl/CassandraElementRepositoryFactory.java b/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/impl/cassandra/ElementRepositoryFactoryImpl.java
index f3072a6502..8540816f00 100644
--- a/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/impl/CassandraElementRepositoryFactory.java
+++ b/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/impl/cassandra/ElementRepositoryFactoryImpl.java
@@ -14,15 +14,15 @@
  * limitations under the License.
  */
 
-package org.openecomp.core.zusammen.plugin.dao.impl;
+package org.openecomp.core.zusammen.plugin.dao.impl.cassandra;
 
 import com.amdocs.zusammen.datatypes.SessionContext;
 import org.openecomp.core.zusammen.plugin.dao.ElementRepository;
 import org.openecomp.core.zusammen.plugin.dao.ElementRepositoryFactory;
 
-public class CassandraElementRepositoryFactory extends ElementRepositoryFactory {
+public class ElementRepositoryFactoryImpl extends ElementRepositoryFactory {
 
-  private static final ElementRepository INSTANCE = new CassandraElementRepository();
+  private static final ElementRepository INSTANCE = new ElementRepositoryImpl();
 
   @Override
   public ElementRepository createInterface(SessionContext context) {
diff --git a/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/impl/cassandra/ElementRepositoryImpl.java b/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/impl/cassandra/ElementRepositoryImpl.java
new file mode 100644
index 0000000000..bb3b1cfa7c
--- /dev/null
+++ b/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/impl/cassandra/ElementRepositoryImpl.java
@@ -0,0 +1,565 @@
+/*
+ * Copyright © 2016-2017 European Support Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.openecomp.core.zusammen.plugin.dao.impl.cassandra;
+
+import com.amdocs.zusammen.datatypes.Id;
+import com.amdocs.zusammen.datatypes.Namespace;
+import com.amdocs.zusammen.datatypes.SessionContext;
+import com.amdocs.zusammen.datatypes.item.Info;
+import com.amdocs.zusammen.datatypes.item.Relation;
+import com.amdocs.zusammen.plugin.statestore.cassandra.dao.types.ElementEntityContext;
+import com.amdocs.zusammen.utils.fileutils.json.JsonUtil;
+import com.datastax.driver.core.ResultSet;
+import com.datastax.driver.core.Row;
+import com.datastax.driver.mapping.annotations.Accessor;
+import com.datastax.driver.mapping.annotations.Param;
+import com.datastax.driver.mapping.annotations.Query;
+import com.google.gson.reflect.TypeToken;
+import org.openecomp.core.zusammen.plugin.ZusammenPluginConstants;
+import org.openecomp.core.zusammen.plugin.dao.ElementRepository;
+import org.openecomp.core.zusammen.plugin.dao.types.ElementEntity;
+
+import java.lang.reflect.Type;
+import java.nio.ByteBuffer;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+import java.util.Set;
+import java.util.TreeMap;
+import java.util.stream.Collectors;
+
+public class ElementRepositoryImpl implements ElementRepository {
+
+  @Override
+  public Map<Id, Id> listIds(SessionContext context, ElementEntityContext elementContext) {
+
+    if (elementContext.getRevisionId() == null) {
+      String revisionId = calculateLastRevisionId(context, elementContext);
+      if (revisionId == null) {
+        return new HashMap<>();
+      }
+
+      elementContext.setRevisionId(new Id(revisionId));
+    }
+    return getVersionElementIds(context, elementContext).entrySet().stream().collect(Collectors
+        .toMap(entry -> new Id(entry.getKey()), entry -> new Id(entry.getValue())));
+
+   /* return getVersionElementIds(context, elementContext).stream()
+        .map(Id::new)
+        .collect(Collectors.toList());*/
+
+  }
+
+  @Override
+  public void create(SessionContext context, ElementEntityContext elementContext,
+                     ElementEntity element) {
+    createElement(context, elementContext, element);
+    addElementToParent(context, elementContext, element);
+  }
+
+  @Override
+  public void update(SessionContext context, ElementEntityContext elementContext,
+                     ElementEntity element) {
+
+    Id elementRevisionId = getElementRevision(context, elementContext, element.getId());
+    if (elementRevisionId.equals(elementContext.getRevisionId())) {
+      updateElement(context, elementContext, element);
+    } else {
+      createElement(context, elementContext, element);
+    }
+  }
+
+  @Override
+  public void delete(SessionContext context, ElementEntityContext elementContext,
+                     ElementEntity element) {
+    removeElementFromParent(context, elementContext, element);
+    deleteElement(context, elementContext, element);
+  }
+
+  @Override
+  public Optional<ElementEntity> get(SessionContext context, ElementEntityContext elementContext,
+                                     ElementEntity element) {
+    String revisionId = calculateElementRevisionId(context, elementContext, element);
+    if (revisionId == null) {
+      return Optional.empty();
+    }
+
+    Row row = getElementAccessor(context).get(
+        elementContext.getSpace(),
+        elementContext.getItemId().toString(),
+        elementContext.getVersionId().toString(),
+        element.getId().toString(),
+        revisionId).one();
+
+    return row == null ? Optional.empty() : Optional.of(getElementEntity(element, row));
+  }
+
+  @Override
+  public Optional<ElementEntity> getDescriptor(SessionContext context,
+                                               ElementEntityContext elementContext,
+                                               ElementEntity element) {
+    String revisionId = calculateElementRevisionId(context, elementContext, element);
+    if (revisionId == null) {
+      return Optional.empty();
+    }
+
+    Row row = getElementAccessor(context).getDescriptor(
+        elementContext.getSpace(),
+        elementContext.getItemId().toString(),
+        elementContext.getVersionId().toString(),
+        element.getId().toString(),
+        revisionId).one();
+
+    return row == null ? Optional.empty() : Optional.of(getElementEntityDescriptor(element, row));
+  }
+
+  @Override
+  public void createNamespace(SessionContext context, ElementEntityContext elementContext,
+                              ElementEntity element) {
+    getElementNamespaceAccessor(context).create(elementContext.getItemId().toString(),
+        element.getId().toString(),
+        element.getNamespace().toString());
+  }
+
+  @Override
+  public Optional<Id> getHash(SessionContext context, ElementEntityContext elementContext,
+                              ElementEntity element) {
+    String revisionId = calculateElementRevisionId(context, elementContext, element);
+    if (revisionId == null) {
+      return Optional.empty();
+    }
+
+    Row row = getElementAccessor(context).getHash(
+        elementContext.getSpace(),
+        elementContext.getItemId().toString(),
+        elementContext.getVersionId().getValue(),
+        element.getId().toString(),
+        revisionId).one();
+
+    return row == null ? Optional.empty() : Optional.of(getElementHash(row));
+  }
+
+  private String calculateElementRevisionId(SessionContext context,
+                                            ElementEntityContext elementContext,
+                                            ElementEntity element) {
+
+    if (elementContext.getSpace().equals(ZusammenPluginConstants.PUBLIC_SPACE)) {
+
+      String versionRevision;
+      if (elementContext.getRevisionId() == null) {
+        versionRevision = calculateLastRevisionId(context, elementContext);
+      } else {
+        versionRevision = elementContext.getRevisionId().getValue();
+      }
+
+      elementContext.setRevisionId(new Id(versionRevision));
+      Map<String, String> elementIds = getVersionElementIds(context, elementContext);
+      if (elementIds.containsKey(element.getId().getValue())) {
+        return elementIds.get(element.getId().getValue());
+      } else {
+        return null;
+      }
+
+    } else {
+      return Id.ZERO.getValue();
+    }
+  }
+
+  private String calculateLastRevisionId(SessionContext context, ElementEntityContext
+      elementContext) {
+    List<Row> rows = getVersionElementsAccessor(context).listRevisions(elementContext.getSpace(),
+        elementContext
+            .getItemId().toString(), elementContext.getVersionId().toString()).all();
+    if (rows == null || rows.size() == 0) {
+      return null;
+    }
+    rows.sort((o1, o2) -> o1.getDate(VersionElementsField.PUBLISH_TIME)
+        .after(o2.getDate(VersionElementsField.PUBLISH_TIME)) ? -1 : 1);
+    return rows.get(0).getString(VersionElementsField.REVISION_ID);
+  }
+
+  /*private static String getVersionId(ElementEntityContext elementContext) {
+    return elementContext.getRevisionId() == null
+        ? elementContext.getVersionId().toString()
+        : elementContext.getRevisionId().getValue();
+  }*/
+
+  private ElementNamespaceAccessor getElementNamespaceAccessor(SessionContext context) {
+    return CassandraDaoUtils.getAccessor(context, ElementNamespaceAccessor.class);
+  }
+
+  private ElementAccessor getElementAccessor(SessionContext context) {
+    return CassandraDaoUtils.getAccessor(context, ElementAccessor.class);
+  }
+
+  private VersionElementsAccessor getVersionElementsAccessor(SessionContext context) {
+    return CassandraDaoUtils.getAccessor(context, VersionElementsAccessor.class);
+  }
+
+  private void createElement(SessionContext context, ElementEntityContext elementContext,
+                             ElementEntity element) {
+    createElementRow(context, elementContext, element);
+
+    Map<String, String> elementIds = new TreeMap<>();
+    elementIds.put(element.getId().toString(), elementContext.getRevisionId().getValue());
+    getVersionElementsAccessor(context).addElements(
+        elementIds,
+        elementContext.getSpace(),
+        elementContext.getItemId().toString(),
+        elementContext.getVersionId().getValue(),
+        elementContext.getRevisionId().getValue());
+  }
+
+  private void createElementRow(SessionContext context, ElementEntityContext elementContext,
+                                ElementEntity element) {
+    Set<String> subElementIds =
+        element.getSubElementIds().stream().map(Id::toString).collect(Collectors.toSet());
+
+    getElementAccessor(context).create(
+        elementContext.getSpace(),
+        elementContext.getItemId().toString(),
+        elementContext.getVersionId().getValue(),
+        element.getId().toString(),
+        elementContext.getRevisionId().getValue(),
+        element.getParentId() == null ? null : element.getParentId().toString(),
+        element.getNamespace() == null ? null : element.getNamespace().toString(),
+        JsonUtil.object2Json(element.getInfo()),
+        JsonUtil.object2Json(element.getRelations()),
+        element.getData(),
+        element.getSearchableData(),
+        element.getVisualization(),
+        subElementIds,
+        element.getElementHash().getValue());
+  }
+
+  private void updateElement(SessionContext context, ElementEntityContext elementContext,
+                             ElementEntity element) {
+
+
+    if (element.getParentId() == null) {
+      getElementAccessor(context).update(
+          JsonUtil.object2Json(element.getInfo()),
+          JsonUtil.object2Json(element.getRelations()),
+          element.getData(),
+          element.getSearchableData(),
+          element.getVisualization(),
+          element.getElementHash().getValue(),
+          elementContext.getSpace(),
+          elementContext.getItemId().toString(),
+          elementContext.getVersionId().toString(),
+          element.getId().toString(),
+          elementContext.getRevisionId().getValue());
+    } else {
+      getElementAccessor(context).update(
+          JsonUtil.object2Json(element.getInfo()),
+          JsonUtil.object2Json(element.getRelations()),
+          element.getData(),
+          element.getSearchableData(),
+          element.getVisualization(),
+          element.getElementHash().getValue(),
+          element.getParentId().getValue(),
+          elementContext.getSpace(),
+          elementContext.getItemId().toString(),
+          elementContext.getVersionId().toString(),
+          element.getId().getValue(),
+          elementContext.getRevisionId().getValue());
+    }
+
+    Map<String, String> elementIds = new TreeMap<>();
+    elementIds.put(element.getId().getValue(), elementContext.getRevisionId().getValue());
+    getVersionElementsAccessor(context).addElements(
+        elementIds,
+        elementContext.getSpace(),
+        elementContext.getItemId().toString(),
+        elementContext.getVersionId().getValue(),
+        elementContext.getRevisionId().getValue());
+  }
+
+  private void deleteElement(SessionContext context, ElementEntityContext elementContext,
+                             ElementEntity element) {
+
+
+    getElementAccessor(context).delete(
+        elementContext.getSpace(),
+        elementContext.getItemId().toString(),
+        elementContext.getVersionId().toString(),
+        element.getId().toString(),
+        elementContext.getRevisionId().getValue());
+
+    getVersionElementsAccessor(context).removeElements(
+        Collections.singleton(element.getId().toString()),
+        elementContext.getSpace(),
+        elementContext.getItemId().toString(),
+        elementContext.getVersionId().toString(),
+        elementContext.getRevisionId().getValue());
+  }
+
+  private void addElementToParent(SessionContext context, ElementEntityContext elementContext,
+                                  ElementEntity element) {
+    if (element.getParentId() == null) {
+      return;
+    }
+
+
+    getElementAccessor(context).addSubElements(
+        Collections.singleton(element.getId().toString()),
+        elementContext.getSpace(),
+        elementContext.getItemId().toString(),
+        elementContext.getVersionId().toString(),
+        element.getParentId().toString(),
+        elementContext.getRevisionId().getValue());
+
+    Map<String, String> elementIds = new TreeMap<>();
+    elementIds.put(element.getParentId().toString(), elementContext.getRevisionId().getValue());
+    getVersionElementsAccessor(context).addElements(elementIds, elementContext.getSpace(),
+        elementContext.getItemId().getValue(), elementContext.getVersionId().getValue(),
+        elementContext.getRevisionId().getValue());
+  }
+
+  private void removeElementFromParent(SessionContext context, ElementEntityContext elementContext,
+                                       ElementEntity element) {
+
+    if (element.getParentId() == null) {
+      return;
+    }
+
+    Optional<ElementEntity> parentElement =
+        get(context, elementContext, new ElementEntity(element.getParentId()));
+    if (!parentElement.isPresent()) {
+      return;
+    }
+    getElementAccessor(context).removeSubElements(
+        Collections.singleton(element.getId().toString()),
+        elementContext.getSpace(),
+        elementContext.getItemId().toString(),
+        elementContext.getVersionId().toString(),
+        element.getParentId().toString(),
+        elementContext.getRevisionId().getValue());
+
+    getVersionElementsAccessor(context)
+        .removeElements(Collections.singleton(element.getId().toString()),
+            elementContext.getSpace(),
+            elementContext.getItemId().getValue(), elementContext.getVersionId().getValue(),
+            elementContext.getRevisionId().getValue());
+
+    Map<String, String> elementIds = new TreeMap<>();
+    elementIds.put(element.getParentId().toString(), elementContext.getRevisionId().getValue());
+    getVersionElementsAccessor(context).addElements(elementIds, elementContext.getSpace(),
+        elementContext.getItemId().getValue(), elementContext.getVersionId().getValue(),
+        elementContext.getRevisionId().getValue());
+  }
+
+  static ElementEntity getElementEntityDescriptor(ElementEntity element, Row row) {
+    element.setNamespace(getNamespace(row.getString(ElementField.NAMESPACE)));
+    element.setParentId(getParentId(row.getString(ElementField.PARENT_ID)));
+    element.setInfo(json2Object(row.getString(ElementField.INFO), Info.class));
+    element.setRelations(
+        json2Object(row.getString(ElementField.RELATIONS), new TypeToken<ArrayList<Relation>>() {
+        }.getType()));
+
+    element.setSubElementIds(row.getSet(ElementField.SUB_ELEMENT_IDS, String.class)
+        .stream().map(Id::new).collect(Collectors.toSet()));
+    return element;
+  }
+
+  static ElementEntity getElementEntity(ElementEntity element, Row row) {
+    getElementEntityDescriptor(element, row);
+
+    element.setData(row.getBytes(ElementField.DATA));
+    element.setSearchableData(row.getBytes(ElementField.SEARCHABLE_DATA));
+    element.setVisualization(row.getBytes(ElementField.VISUALIZATION));
+    element.setElementHash(new Id(row.getString(ElementField.ELEMENT_HASH)));
+    return element;
+  }
+
+  private Id getElementHash(Row row) {
+    return new Id(row.getString(ElementField.ELEMENT_HASH));
+  }
+
+  private static Id getParentId(String parentIdStr) {
+    return parentIdStr == null ? null : new Id(parentIdStr);
+  }
+
+  private static Namespace getNamespace(String namespaceStr) {
+    Namespace namespace = new Namespace();
+    if (namespaceStr != null) {
+      namespace.setValue(namespaceStr);
+    }
+    return namespace;
+  }
+
+  private static <T> T json2Object(String json, Type typeOfT) {
+    return json == null ? null : JsonUtil.json2Object(json, typeOfT);
+  }
+
+  private Map<String, String> getVersionElementIds(SessionContext context,
+                                                   ElementEntityContext elementContext) {
+    Row row = getVersionElementsAccessor(context).get(
+        elementContext.getSpace(),
+        elementContext.getItemId().toString(),
+        elementContext.getVersionId().getValue(),
+        elementContext.getRevisionId().getValue()).one();
+    return row == null
+        ? new HashMap<>()
+        : row.getMap(ElementRepositoryImpl.VersionElementsField.ELEMENT_IDS, String.class, String
+            .class);
+  }
+
+  private Id getElementRevision(SessionContext context, ElementEntityContext elementContext
+      , Id elementId) {
+    Map<Id, Id> versionElementIds =
+        listIds(context, new ElementEntityContext
+            (elementContext.getSpace(), elementContext.getItemId(), elementContext.getVersionId(),
+                elementContext.getRevisionId()));
+    return versionElementIds.get(elementId);
+
+  }
+
+
+  /*
+CREATE TABLE IF NOT EXISTS element_namespace (
+	item_id text,
+	element_id text,
+	namespace text,
+	PRIMARY KEY (( item_id, element_id ))
+);
+   */
+  @Accessor
+  interface ElementNamespaceAccessor {
+    @Query("UPDATE element_namespace SET namespace=:ns " +
+        "WHERE item_id=:item AND element_id=:id ")
+    void create(@Param("item") String itemId,
+                @Param("id") String elementId,
+                @Param("ns") String namespace);
+  }
+
+  @Accessor
+  interface ElementAccessor {
+    @Query(
+        "UPDATE element SET parent_id=:parentId, namespace=:ns, info=:info, relations=:rels, " +
+            "data=:data, searchable_data=:searchableData, visualization=:visualization, " +
+            "sub_element_ids=sub_element_ids+:subs , element_hash=:elementHash " +
+            " WHERE space=:space AND item_id=:item AND version_id=:ver AND element_id=:id AND " +
+            "revision_id=:rev ")
+    void create(@Param("space") String space,
+                @Param("item") String itemId,
+                @Param("ver") String versionId,
+                @Param("id") String elementId,
+                @Param("rev") String revisionId,
+                @Param("parentId") String parentElementId,
+                @Param("ns") String namespace,
+                @Param("info") String info,
+                @Param("rels") String relations,
+                @Param("data") ByteBuffer data,
+                @Param("searchableData") ByteBuffer searchableData,
+                @Param("visualization") ByteBuffer visualization,
+                @Param("subs") Set<String> subElementIds,
+                @Param("elementHash") String elementHash);
+
+
+    @Query("UPDATE element SET info=?, relations=?, data=?, searchable_data=?, visualization=? ," +
+        "element_hash=? , parent_id=? " +
+        " WHERE space=? AND item_id=? AND version_id=? AND element_id=? AND revision_id=?  ")
+    void update(String info, String relations, ByteBuffer data, ByteBuffer searchableData,
+                ByteBuffer visualization, String elementHash, String parentId, String space, String
+                    itemId, String
+                    versionId, String elementId, String revisionId);
+
+    @Query("UPDATE element SET info=?, relations=?, data=?, searchable_data=?, visualization=? ," +
+        "element_hash=? " +
+        " WHERE space=? AND item_id=? AND version_id=? AND element_id=? AND revision_id=?  ")
+    void update(String info, String relations, ByteBuffer data, ByteBuffer searchableData,
+                ByteBuffer visualization, String elementHash, String space, String
+                    itemId, String
+                    versionId, String elementId, String revisionId);
+
+    @Query(
+        "DELETE FROM element WHERE space=? AND item_id=? AND version_id=? AND element_id=? AND revision_id=? ")
+    void delete(String space, String itemId, String versionId, String elementId, String revisionId);
+
+    @Query("SELECT parent_id, namespace, info, relations, data, searchable_data, visualization, " +
+        "sub_element_ids,element_hash FROM element " +
+        "WHERE space=? AND item_id=? AND version_id=? AND element_id=? AND revision_id=? ")
+    ResultSet get(String space, String itemId, String versionId, String elementId, String
+        revisionId);
+
+    @Query("SELECT parent_id, namespace, info, relations, sub_element_ids FROM element " +
+        "WHERE space=? AND item_id=? AND version_id=? AND element_id=? AND revision_id=? ")
+    ResultSet getDescriptor(String space, String itemId, String versionId, String elementId,
+                            String revisionId);
+
+    @Query("UPDATE element SET sub_element_ids=sub_element_ids+? " +
+        " WHERE space=? AND item_id=? AND version_id=? AND element_id=? AND revision_id=?  ")
+    void addSubElements(Set<String> subElementIds, String space, String itemId, String versionId,
+                        String elementId, String revisionId);
+
+    @Query("UPDATE element SET sub_element_ids=sub_element_ids-? " +
+        " WHERE space=? AND item_id=? AND version_id=? AND element_id=? AND revision_id=? ")
+    void removeSubElements(Set<String> subElementIds, String space, String itemId, String versionId,
+                           String elementId, String revisionId);
+
+    @Query("SELECT element_hash FROM element " +
+        "WHERE space=? AND item_id=? AND version_id=? AND element_id=? AND revision_id=? ")
+    ResultSet getHash(String space, String itemId, String versionId, String elementId, String
+        revisionId);
+  }
+
+  private static final class ElementField {
+    private static final String NAMESPACE = "namespace";
+    private static final String PARENT_ID = "parent_id";
+    private static final String INFO = "info";
+    private static final String RELATIONS = "relations";
+    private static final String DATA = "data";
+    private static final String SEARCHABLE_DATA = "searchable_data";
+    private static final String VISUALIZATION = "visualization";
+    private static final String SUB_ELEMENT_IDS = "sub_element_ids";
+    private static final String ELEMENT_HASH = "element_hash";
+  }
+
+  @Accessor
+  interface VersionElementsAccessor {
+
+    @Query("UPDATE version_elements SET element_ids=element_ids+ ? " +
+        "WHERE space=? AND item_id=? AND version_id=? AND revision_id=? ")
+    void addElements(Map<String, String> elementIds, String space, String itemId, String versionId,
+                     String versionRevisionId);
+
+    @Query("UPDATE version_elements SET element_ids=element_ids-? " +
+        "WHERE space=? AND item_id=? AND version_id=? AND revision_id=?")
+    void removeElements(Set<String> elementIds, String space, String itemId, String versionId,
+                        String revisionId);
+
+    @Query(
+        "SELECT element_ids FROM version_elements WHERE space=? AND item_id=? AND version_id=? AND revision_id=? ")
+    ResultSet get(String space, String itemId, String versionId, String revisionId);
+
+    @Query(
+        "SELECT revision_id,publish_time FROM version_elements WHERE space=? AND item_id=? AND " +
+            "version_id=? ")
+    ResultSet listRevisions(String space, String itemId, String versionId);
+
+  }
+
+  private static final class VersionElementsField {
+    private static final String ELEMENT_IDS = "element_ids";
+    private static final String REVISION_ID = "revision_id";
+    private static final String PUBLISH_TIME = "publish_time";
+  }
+}
diff --git a/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/impl/cassandra/ElementStageRepositoryFactoryImpl.java b/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/impl/cassandra/ElementStageRepositoryFactoryImpl.java
new file mode 100644
index 0000000000..02bec12302
--- /dev/null
+++ b/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/impl/cassandra/ElementStageRepositoryFactoryImpl.java
@@ -0,0 +1,31 @@
+/*
+ * Copyright © 2016-2017 European Support Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.openecomp.core.zusammen.plugin.dao.impl.cassandra;
+
+import com.amdocs.zusammen.datatypes.SessionContext;
+import org.openecomp.core.zusammen.plugin.dao.ElementStageRepository;
+import org.openecomp.core.zusammen.plugin.dao.ElementStageRepositoryFactory;
+
+public class ElementStageRepositoryFactoryImpl extends ElementStageRepositoryFactory {
+
+  private static final ElementStageRepository INSTANCE = new ElementStageRepositoryImpl();
+
+  @Override
+  public ElementStageRepository createInterface(SessionContext context) {
+    return INSTANCE;
+  }
+}
diff --git a/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/impl/cassandra/ElementStageRepositoryImpl.java b/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/impl/cassandra/ElementStageRepositoryImpl.java
new file mode 100644
index 0000000000..c215f825a6
--- /dev/null
+++ b/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/impl/cassandra/ElementStageRepositoryImpl.java
@@ -0,0 +1,423 @@
+/*
+ * Copyright © 2016-2017 European Support Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.openecomp.core.zusammen.plugin.dao.impl.cassandra;
+
+import com.amdocs.zusammen.datatypes.Id;
+import com.amdocs.zusammen.datatypes.SessionContext;
+import com.amdocs.zusammen.datatypes.item.Action;
+import com.amdocs.zusammen.plugin.statestore.cassandra.dao.types.ElementEntityContext;
+import com.amdocs.zusammen.utils.fileutils.json.JsonUtil;
+import com.datastax.driver.core.ResultSet;
+import com.datastax.driver.core.Row;
+import com.datastax.driver.mapping.annotations.Accessor;
+import com.datastax.driver.mapping.annotations.Param;
+import com.datastax.driver.mapping.annotations.Query;
+import org.openecomp.core.zusammen.plugin.dao.ElementStageRepository;
+import org.openecomp.core.zusammen.plugin.dao.types.ElementEntity;
+import org.openecomp.core.zusammen.plugin.dao.types.StageEntity;
+
+import java.nio.ByteBuffer;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.Date;
+import java.util.HashSet;
+import java.util.Optional;
+import java.util.Set;
+import java.util.stream.Collectors;
+
+public class ElementStageRepositoryImpl implements ElementStageRepository {
+
+  @Override
+  public Collection<ElementEntity> listIds(SessionContext context,
+                                           ElementEntityContext elementContext) {
+    return getElements(getStageElementIds(context, elementContext));
+  }
+
+  @Override
+  public Collection<ElementEntity> listConflictedIds(SessionContext context,
+                                                     ElementEntityContext elementContext) {
+    return getElements(getConflictedElementIds(context, elementContext));
+  }
+
+  @Override
+  public void create(SessionContext context, ElementEntityContext elementContext,
+                     StageEntity<ElementEntity> elementStage) {
+    createElement(context, elementContext, elementStage);
+    addElementToParent(context, elementContext, elementStage.getEntity());
+  }
+
+  @Override
+  public void markAsNotConflicted(SessionContext context, ElementEntityContext elementContext,
+                                  ElementEntity element, Action action) {
+    getElementStageAccessor(context).updateState(action, false,
+        elementContext.getSpace(),
+        elementContext.getItemId().toString(),
+        elementContext.getVersionId().toString(),
+        element.getId().toString());
+
+    getStageElementsAccessor(context).removeConflictElements(
+        Collections.singleton(element.getId().toString()),
+        elementContext.getSpace(),
+        elementContext.getItemId().toString(),
+        elementContext.getVersionId().toString(),
+        elementContext.getRevisionId().getValue());
+  }
+
+  @Override
+  public void markAsNotConflicted(SessionContext context, ElementEntityContext elementContext,
+                                  ElementEntity element) {
+    getElementStageAccessor(context).markAsNotConflicted(
+        elementContext.getSpace(),
+        elementContext.getItemId().toString(),
+        elementContext.getVersionId().toString(),
+        element.getId().toString());
+
+    getStageElementsAccessor(context).removeConflictElements(
+        Collections.singleton(element.getId().toString()),
+        elementContext.getSpace(),
+        elementContext.getItemId().toString(),
+        elementContext.getVersionId().toString(),
+        elementContext.getRevisionId().getValue());
+  }
+
+  @Override
+  public void update(SessionContext context, ElementEntityContext elementContext,
+                     ElementEntity element, Action action, boolean conflicted) {
+    getElementStageAccessor(context).update(
+        JsonUtil.object2Json(element.getInfo()),
+        JsonUtil.object2Json(element.getRelations()),
+        element.getData(),
+        element.getSearchableData(),
+        element.getVisualization(),
+        element.getElementHash().getValue(),
+        action,
+        conflicted,
+        elementContext.getSpace(),
+        elementContext.getItemId().toString(),
+        elementContext.getVersionId().toString(),
+        element.getId().toString());
+
+    if (!conflicted) {
+      getStageElementsAccessor(context).removeConflictElements(
+          Collections.singleton(element.getId().toString()),
+          elementContext.getSpace(),
+          elementContext.getItemId().toString(),
+          elementContext.getVersionId().toString(),
+          elementContext.getRevisionId().getValue());
+    }
+  }
+
+  @Override
+  public void delete(SessionContext context, ElementEntityContext elementContext,
+                     ElementEntity element) {
+    removeElementFromParent(context, elementContext, element);
+    deleteElement(context, elementContext, element);
+  }
+
+  @Override
+  public Optional<StageEntity<ElementEntity>> get(SessionContext context,
+                                                  ElementEntityContext elementContext,
+                                                  ElementEntity element) {
+    Row row = getElementStageAccessor(context).get(
+        elementContext.getSpace(),
+        elementContext.getItemId().toString(),
+        elementContext.getVersionId().getValue(),
+        element.getId().toString()).one();
+
+    return row == null ? Optional.empty() : Optional.of(getStageElement(row));
+  }
+
+  @Override
+  public Optional<StageEntity<ElementEntity>> getDescriptor(SessionContext context,
+                                                            ElementEntityContext elementContext,
+                                                            ElementEntity element) {
+    Row row = getElementStageAccessor(context).getDescriptor(
+        elementContext.getSpace(),
+        elementContext.getItemId().toString(),
+        elementContext.getVersionId().getValue(),
+        element.getId().toString()).one();
+
+    return row == null ? Optional.empty() : Optional.of(getStageElementDescriptor(row));
+  }
+
+
+
+  private Collection<ElementEntity> getElements(Set<String> elementIds) {
+    return elementIds.stream()
+        .map(id -> new ElementEntity(new Id(id)))
+        .collect(Collectors.toList());
+  }
+
+  private void createElement(SessionContext context, ElementEntityContext elementContext,
+                             StageEntity<ElementEntity> elementStage) {
+
+
+    ElementEntity element = elementStage.getEntity();
+    Set<String> subElementIds =
+        element.getSubElementIds().stream().map(Id::toString).collect(Collectors.toSet());
+    Set<String> conflictDependents = elementStage.getConflictDependents().stream()
+        .map(conflictDependent -> conflictDependent.getId().getValue())
+        .collect(Collectors.toSet());
+
+    getElementStageAccessor(context).create(
+        elementContext.getSpace(),
+        elementContext.getItemId().toString(),
+        elementContext.getVersionId().getValue(),
+        element.getId().toString(),
+        element.getParentId() == null ? null : element.getParentId().toString(),
+        element.getNamespace() == null ? null : element.getNamespace().toString(),
+        JsonUtil.object2Json(element.getInfo()),
+        JsonUtil.object2Json(element.getRelations()),
+        element.getData(),
+        element.getSearchableData(),
+        element.getVisualization(),
+        subElementIds,
+        element.getElementHash() == null ? null : element.getElementHash().getValue(),
+        elementStage.getPublishTime(),
+        elementStage.getAction(),
+        elementStage.isConflicted(),
+        conflictDependents);
+
+    getStageElementsAccessor(context).add(
+        Collections.singleton(element.getId().toString()),
+        elementContext.getSpace(),
+        elementContext.getItemId().toString(),
+        elementContext.getVersionId().getValue(),
+        elementContext.getRevisionId().getValue());
+
+    if (elementStage.isConflicted()) {
+      getStageElementsAccessor(context).addConflictElements(
+          Collections.singleton(element.getId().toString()),
+          elementContext.getSpace(),
+          elementContext.getItemId().toString(),
+          elementContext.getVersionId().getValue(),
+          elementContext.getRevisionId().getValue());
+    }
+  }
+
+  private void deleteElement(SessionContext context, ElementEntityContext elementContext,
+                             ElementEntity element) {
+
+
+    getElementStageAccessor(context).delete(
+        elementContext.getSpace(),
+        elementContext.getItemId().toString(),
+        elementContext.getVersionId().getValue(),
+        element.getId().toString());
+
+    getStageElementsAccessor(context).remove(
+        Collections.singleton(element.getId().toString()),
+        elementContext.getSpace(),
+        elementContext.getItemId().toString(),
+        elementContext.getVersionId().getValue(),
+        elementContext.getRevisionId().getValue());
+  }
+
+  private void addElementToParent(SessionContext context, ElementEntityContext elementContext,
+                                  ElementEntity element) {
+    if (element.getParentId() == null) {
+      return;
+    }
+    getElementStageAccessor(context).addSubElements(
+        Collections.singleton(element.getId().toString()),
+        elementContext.getSpace(),
+        elementContext.getItemId().toString(),
+        elementContext.getVersionId().getValue(),
+        element.getParentId().toString());
+  }
+
+  private void removeElementFromParent(SessionContext context, ElementEntityContext elementContext,
+                                       ElementEntity element) {
+    if (element.getParentId() == null) {
+      return;
+    }
+    getElementStageAccessor(context).removeSubElements(
+        Collections.singleton(element.getId().toString()),
+        elementContext.getSpace(),
+        elementContext.getItemId().toString(),
+        elementContext.getVersionId().getValue(),
+        element.getParentId().toString());
+  }
+
+  private StageEntity<ElementEntity> getStageElementDescriptor(Row row) {
+    return buildStageElement(ElementRepositoryImpl.getElementEntityDescriptor(
+        new ElementEntity(new Id(row.getString(ElementStageField.ID))), row), row);
+  }
+
+  private StageEntity<ElementEntity> getStageElement(Row row) {
+    return buildStageElement(ElementRepositoryImpl.getElementEntity(
+        new ElementEntity(new Id(row.getString(ElementStageField.ID))), row), row);
+  }
+
+
+  private StageEntity<ElementEntity> buildStageElement(ElementEntity element, Row row) {
+    StageEntity<ElementEntity> elementStage =
+        new StageEntity<>(element, row.getDate(ElementStageField.PUBLISH_TIME));
+    elementStage.setAction(Action.valueOf(row.getString(ElementStageField.ACTION)));
+    elementStage.setConflicted(row.getBool(ElementStageField.CONFLICTED));
+    elementStage.setConflictDependents(
+        row.getSet(ElementStageField.CONFLICT_DEPENDENTS, String.class).stream()
+            .map(conflictDependentId -> new ElementEntity(new Id(conflictDependentId)))
+            .collect(Collectors.toSet()));
+    return elementStage;
+  }
+
+  private Set<String> getStageElementIds(SessionContext context,
+                                         ElementEntityContext elementContext) {
+    Row row = getStageElementsAccessor(context).get(
+        elementContext.getSpace(),
+        elementContext.getItemId().toString(),
+        elementContext.getVersionId().getValue(),
+        elementContext.getRevisionId().getValue()).one();
+    return row == null ? new HashSet<>()
+        : row.getSet(StageElementsField.STAGE_ELEMENT_IDS, String.class);
+  }
+
+  private Set<String> getConflictedElementIds(SessionContext context,
+                                              ElementEntityContext elementContext) {
+    Row row = getStageElementsAccessor(context).getConflicted(
+        elementContext.getSpace(),
+        elementContext.getItemId().toString(),
+        elementContext.getVersionId().getValue(),
+        elementContext.getRevisionId().getValue()).one();
+    return row == null ? new HashSet<>()
+        : row.getSet(StageElementsField.CONFLICT_ELEMENT_IDS, String.class);
+  }
+
+  private ElementStageAccessor getElementStageAccessor(SessionContext context) {
+    return CassandraDaoUtils.getAccessor(context, ElementStageAccessor.class);
+  }
+
+  private StageElementsAccessor getStageElementsAccessor(SessionContext context) {
+    return CassandraDaoUtils.getAccessor(context, StageElementsAccessor.class);
+  }
+
+  @Accessor
+  interface ElementStageAccessor {
+    @Query(
+        "UPDATE element_stage SET parent_id=:parentId, namespace=:ns, info=:info, relations=:rels, " +
+            "data=:data, searchable_data=:searchableData, visualization=:visualization, " +
+            "publish_time=:publishTime, action=:action, " +
+            "conflicted=:conflicted, conflict_dependent_ids=:conflictDependents, " +
+            "sub_element_ids=sub_element_ids+:subs, element_hash=:elementHash " +
+            "WHERE space=:space AND item_id=:item AND version_id=:ver AND element_id=:id ")
+    void create(@Param("space") String space,
+                @Param("item") String itemId,
+                @Param("ver") String versionId,
+                @Param("id") String elementId,
+                @Param("parentId") String parentElementId,
+                @Param("ns") String namespace,
+                @Param("info") String info,
+                @Param("rels") String relations,
+                @Param("data") ByteBuffer data,
+                @Param("searchableData") ByteBuffer searchableData,
+                @Param("visualization") ByteBuffer visualization,
+                @Param("subs") Set<String> subElementIds,
+                @Param("elementHash") String elementHash,
+                @Param("publishTime") Date publishTime,
+                @Param("action") Action action,
+                @Param("conflicted") boolean conflicted,
+                @Param("conflictDependents") Set<String> conflictDependents);
+
+    @Query("UPDATE element_stage SET info=?, relations=?, data=?, searchable_data=?, " +
+        "visualization=?,element_hash=?, action=?, conflicted=? " +
+        " WHERE space=? AND item_id=? AND version_id=? AND element_id=?  ")
+    void update(String info, String relations, ByteBuffer data, ByteBuffer searchableData,
+                ByteBuffer visualization, String elementHash, Action action, boolean conflicted,
+                String space,
+                String itemId, String versionId, String elementId);
+
+    @Query("UPDATE element_stage SET action=?, conflicted=? " +
+        " WHERE space=? AND item_id=? AND version_id=? AND element_id=?  ")
+    void updateState(Action action, boolean conflicted, String space, String itemId,
+                     String versionId, String elementId);
+
+    @Query("UPDATE element_stage SET conflicted=false " +
+        " WHERE space=? AND item_id=? AND version_id=? AND element_id=?  ")
+    void markAsNotConflicted(String space, String itemId, String versionId, String elementId);
+
+    @Query(
+        "DELETE FROM element_stage WHERE space=? AND item_id=? AND version_id=? AND element_id=?")
+    void delete(String space, String itemId, String versionId, String elementId);
+
+    @Query("SELECT element_id, parent_id, namespace, info, relations, data, searchable_data, " +
+        "visualization, sub_element_ids,element_hash, publish_time, action, " +
+        "conflicted, conflict_dependent_ids FROM element_stage " +
+        "WHERE space=? AND item_id=? AND version_id=? AND element_id=? ")
+    ResultSet get(String space, String itemId, String versionId, String elementId);
+
+    @Query("SELECT element_id, parent_id, namespace, info, relations, " +
+        "sub_element_ids, publish_time, action, conflicted, conflict_dependent_ids " +
+        "FROM element_stage WHERE space=? AND item_id=? AND version_id=? AND element_id=? ")
+    ResultSet getDescriptor(String space, String itemId, String versionId, String elementId);
+
+    @Query("UPDATE element_stage SET sub_element_ids=sub_element_ids+? " +
+        " WHERE space=? AND item_id=? AND version_id=? AND element_id=?  ")
+    void addSubElements(Set<String> subElementIds, String space, String itemId, String versionId,
+                        String elementId);
+
+    @Query("UPDATE element_stage SET sub_element_ids=sub_element_ids-? " +
+        " WHERE space=? AND item_id=? AND version_id=? AND element_id=? ")
+    void removeSubElements(Set<String> subElementIds, String space, String itemId, String versionId,
+                           String elementId);
+  }
+
+  private static final class ElementStageField {
+    private static final String ID = "element_id";
+    private static final String PUBLISH_TIME = "publish_time";
+    private static final String ACTION = "action";
+    private static final String CONFLICTED = "conflicted";
+    private static final String CONFLICT_DEPENDENTS = "conflict_dependent_ids";
+  }
+
+  @Accessor
+  interface StageElementsAccessor {
+
+    @Query("UPDATE version_elements SET stage_element_ids=stage_element_ids+? " +
+        "WHERE space=? AND item_id=? AND version_id=? AND revision_id=? ")
+    void add(Set<String> elementIds, String space, String itemId, String versionId, String
+        revisionId);
+
+    @Query("UPDATE version_elements SET stage_element_ids=stage_element_ids-? " +
+        "WHERE space=? AND item_id=? AND version_id=? AND revision_id=? ")
+    void remove(Set<String> elementIds, String space, String itemId, String versionId, String
+        revisionId);
+
+    @Query("SELECT stage_element_ids FROM version_elements " +
+        "WHERE space=? AND item_id=? AND version_id=? AND revision_id=?")
+    ResultSet get(String space, String itemId, String versionId, String revisionId);
+
+    @Query("UPDATE version_elements SET conflict_element_ids=conflict_element_ids+? " +
+        "WHERE space=? AND item_id=? AND version_id=? AND revision_id=? ")
+    void addConflictElements(Set<String> elementIds, String space, String itemId, String
+        versionId, String revisionId);
+
+    @Query("UPDATE version_elements SET conflict_element_ids=conflict_element_ids-? " +
+        "WHERE space=? AND item_id=? AND version_id=? AND revision_id=? ")
+    void removeConflictElements(Set<String> elementIds, String space, String itemId,
+                                String versionId, String revisionId);
+
+    @Query("SELECT conflict_element_ids FROM version_elements " +
+        "WHERE space=? AND item_id=? AND version_id=? AND revision_id=? ")
+    ResultSet getConflicted(String space, String itemId, String versionId, String revisionId);
+  }
+
+  private static final class StageElementsField {
+    private static final String STAGE_ELEMENT_IDS = "stage_element_ids";
+    private static final String CONFLICT_ELEMENT_IDS = "conflict_element_ids";
+  }
+}
diff --git a/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/impl/cassandra/ElementSynchronizationStateRepositoryFactoryImpl.java b/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/impl/cassandra/ElementSynchronizationStateRepositoryFactoryImpl.java
new file mode 100644
index 0000000000..ec7e1c30ae
--- /dev/null
+++ b/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/impl/cassandra/ElementSynchronizationStateRepositoryFactoryImpl.java
@@ -0,0 +1,33 @@
+/*
+ * Copyright © 2016-2017 European Support Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.openecomp.core.zusammen.plugin.dao.impl.cassandra;
+
+import com.amdocs.zusammen.datatypes.SessionContext;
+import org.openecomp.core.zusammen.plugin.dao.ElementSynchronizationStateRepository;
+import org.openecomp.core.zusammen.plugin.dao.ElementSynchronizationStateRepositoryFactory;
+
+public class ElementSynchronizationStateRepositoryFactoryImpl
+    extends ElementSynchronizationStateRepositoryFactory {
+
+  private static final ElementSynchronizationStateRepository INSTANCE =
+      new ElementSynchronizationStateRepositoryImpl();
+
+  @Override
+  public ElementSynchronizationStateRepository createInterface(SessionContext context) {
+    return INSTANCE;
+  }
+}
diff --git a/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/impl/cassandra/ElementSynchronizationStateRepositoryImpl.java b/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/impl/cassandra/ElementSynchronizationStateRepositoryImpl.java
new file mode 100644
index 0000000000..d41d3d73b1
--- /dev/null
+++ b/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/impl/cassandra/ElementSynchronizationStateRepositoryImpl.java
@@ -0,0 +1,209 @@
+package org.openecomp.core.zusammen.plugin.dao.impl.cassandra;
+
+import com.amdocs.zusammen.datatypes.Id;
+import com.amdocs.zusammen.datatypes.SessionContext;
+import com.amdocs.zusammen.plugin.statestore.cassandra.dao.types.ElementEntityContext;
+import com.datastax.driver.core.ResultSet;
+import com.datastax.driver.core.Row;
+import com.datastax.driver.mapping.annotations.Accessor;
+import com.datastax.driver.mapping.annotations.Query;
+import org.openecomp.core.zusammen.plugin.dao.ElementSynchronizationStateRepository;
+import org.openecomp.core.zusammen.plugin.dao.types.SynchronizationStateEntity;
+
+import java.util.Collection;
+import java.util.Collections;
+import java.util.Date;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Optional;
+import java.util.Set;
+import java.util.stream.Collectors;
+
+public class ElementSynchronizationStateRepositoryImpl
+    implements ElementSynchronizationStateRepository {
+
+  @Override
+  public Collection<SynchronizationStateEntity> list(SessionContext context,
+                                                     ElementEntityContext elementContext) {
+    List<Row> rows = getAccessor(context)
+        .list(elementContext.getSpace(),
+            elementContext.getItemId().toString(),
+            elementContext.getVersionId().toString()).all();
+    return rows == null ? new HashSet<>()
+        : rows.stream().map(this::getSynchronizationStateEntity).collect(Collectors.toSet());
+
+  }
+
+  @Override
+  public void create(SessionContext context, ElementEntityContext elementContext,
+                     SynchronizationStateEntity elementSyncState) {
+    update(context, elementContext.getSpace(),
+        elementContext.getItemId(),
+        elementContext.getVersionId(),
+        elementContext.getRevisionId(),
+        elementSyncState.getRevisionId(),
+        elementSyncState.getId(),
+        elementSyncState.getPublishTime(),
+        elementSyncState.isDirty()
+
+    );
+  }
+
+  @Override
+  public void update(SessionContext context, ElementEntityContext elementContext,
+                     SynchronizationStateEntity elementSyncState) {
+    update(context, elementContext.getSpace(),
+        elementContext.getItemId(),
+        elementContext.getVersionId(),
+        elementContext.getRevisionId(),
+        elementSyncState.getRevisionId(),
+        elementSyncState.getId(),
+        elementSyncState.getPublishTime(),
+        elementSyncState.isDirty()
+
+    );
+  }
+
+  @Override
+  public void markAsDirty(SessionContext context, ElementEntityContext elementContext,
+                          SynchronizationStateEntity elementSyncState) {
+
+
+      getAccessor(context).updateDirty(true,
+          elementContext.getSpace(),
+          elementContext.getItemId().toString(),
+          elementContext.getVersionId().toString(),
+          elementSyncState.getId().toString(),
+          elementContext.getRevisionId().getValue());
+
+      getVersionElementsAccessor(context).addDirtyElements(
+          Collections.singleton(elementSyncState.getId().toString()), elementContext.getSpace(),
+          elementContext.getItemId().toString(),
+          elementContext.getVersionId().toString(),
+          elementContext.getRevisionId().getValue());
+  }
+
+  @Override
+  public void delete(SessionContext context, ElementEntityContext elementContext,
+                     SynchronizationStateEntity elementSyncState) {
+    getAccessor(context).delete(elementContext.getSpace(),
+        elementContext.getItemId().toString(),
+        elementContext.getVersionId().toString(),
+        elementSyncState.getId().toString(),
+        elementContext.getRevisionId().getValue());
+
+    getVersionElementsAccessor(context).removeDirtyElements(
+        Collections.singleton(elementSyncState.getId().toString()), elementContext.getSpace(),
+        elementContext.getItemId().toString(),
+        elementContext.getVersionId().toString(),
+        elementContext.getRevisionId().getValue());
+  }
+
+  @Override
+  public Optional<SynchronizationStateEntity> get(SessionContext context,
+                                                  ElementEntityContext elementContext,
+                                                  SynchronizationStateEntity elementSyncState) {
+
+    Row row = getAccessor(context)
+        .get(elementContext.getSpace(),
+            elementContext.getItemId().toString(),
+            elementContext.getVersionId().toString(),
+            elementSyncState.getId().toString(),
+            elementSyncState.getRevisionId().getValue()).one();
+
+    return row == null ? Optional.empty() : Optional.of(getSynchronizationStateEntity(row));
+  }
+
+  private void update(SessionContext context, String space, Id itemId, Id versionId, Id
+      versionRevisionId,Id elementRevisionId,Id elementId, Date publishTime, boolean isDirty) {
+    getAccessor(context).update(publishTime,
+        isDirty,
+        space,
+        itemId.toString(),
+        versionId.toString(),
+        elementId.toString(),
+        elementRevisionId.getValue());
+
+    if (isDirty) {
+      getVersionElementsAccessor(context).addDirtyElements(
+          Collections.singleton(elementId.toString()), space,
+          itemId.toString(),
+          versionId.toString(),
+          versionRevisionId.getValue());
+    } else {
+      getVersionElementsAccessor(context).removeDirtyElements(
+          Collections.singleton(elementId.toString()), space,
+          itemId.toString(),
+          versionId.toString(),
+          versionRevisionId.getValue());
+    }
+  }
+
+
+  private SynchronizationStateEntity getSynchronizationStateEntity(Row row) {
+    SynchronizationStateEntity entity =
+        new SynchronizationStateEntity(new Id(row.getString(SynchronizationStateField.ID)),
+            new Id(row.getString(SynchronizationStateField.REVISION_ID)),
+            row.getDate(SynchronizationStateField.PUBLISH_TIME),
+            row.getBool(SynchronizationStateField.DIRTY));
+    entity.setRevisionId(new Id(row.getString(SynchronizationStateField.REVISION_ID)));
+
+    return entity;
+
+  }
+
+  private ElementSynchronizationStateAccessor getAccessor(SessionContext context) {
+    return CassandraDaoUtils.getAccessor(context, ElementSynchronizationStateAccessor.class);
+  }
+
+  private VersionElementsAccessor getVersionElementsAccessor(SessionContext context) {
+    return CassandraDaoUtils.getAccessor(context, VersionElementsAccessor.class);
+  }
+
+  @Accessor
+  interface ElementSynchronizationStateAccessor {
+    @Query("UPDATE element_synchronization_state SET publish_time=?, dirty=? " +
+        "WHERE space=? AND item_id=? AND version_id=? AND element_id=? AND revision_id = ? ")
+    void update(Date publishTime, boolean dirty, String space, String itemId, String versionId,
+                String elementId, String revisionId);
+
+    @Query("UPDATE element_synchronization_state SET dirty=? " +
+        "WHERE space=? AND item_id=? AND version_id=? AND element_id=? AND revision_id = ? ")
+    void updateDirty(boolean dirty, String space, String itemId, String versionId,
+                     String elementId, String revisionId);
+
+    @Query("DELETE FROM element_synchronization_state " +
+        "WHERE space=? AND item_id=? AND version_id=? AND element_id=? AND revision_id = ? ")
+    void delete(String space, String itemId, String versionId, String elementId, String revisionId);
+
+    @Query("SELECT element_id,revision_id, publish_time, dirty FROM element_synchronization_state" +
+        " WHERE space=? AND item_id=? AND version_id=?")
+    ResultSet list(String space, String itemId, String versionId);
+
+    @Query("SELECT element_id,revision_id, publish_time, dirty FROM element_synchronization_state" +
+        " WHERE space=? AND item_id=? AND version_id=? AND element_id=? AND revision_id = ?  ")
+    ResultSet get(String space, String itemId, String versionId, String elementId, String
+        revisionId);
+  }
+
+  private static final class SynchronizationStateField {
+    private static final String ID = "element_id";
+    private static final String PUBLISH_TIME = "publish_time";
+    private static final String DIRTY = "dirty";
+    private static final String REVISION_ID = "revision_id";
+  }
+
+  @Accessor
+  interface VersionElementsAccessor {
+
+    @Query("UPDATE version_elements SET dirty_element_ids=dirty_element_ids+? " +
+        "WHERE space=? AND item_id=? AND version_id=? AND revision_id=?")
+    void addDirtyElements(Set<String> elementIds, String space, String itemId, String versionId,
+                          String revisionId);
+
+    @Query("UPDATE version_elements SET dirty_element_ids=dirty_element_ids-? " +
+        "WHERE space=? AND item_id=? AND version_id=? AND revision_id=? ")
+    void removeDirtyElements(Set<String> elementIds, String space, String itemId, String
+        versionId, String revisionId);
+  }
+}
diff --git a/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/impl/cassandra/VersionDaoFactoryImpl.java b/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/impl/cassandra/VersionDaoFactoryImpl.java
new file mode 100644
index 0000000000..60dc9d1765
--- /dev/null
+++ b/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/impl/cassandra/VersionDaoFactoryImpl.java
@@ -0,0 +1,15 @@
+package org.openecomp.core.zusammen.plugin.dao.impl.cassandra;
+
+import com.amdocs.zusammen.datatypes.SessionContext;
+import org.openecomp.core.zusammen.plugin.dao.VersionDao;
+import org.openecomp.core.zusammen.plugin.dao.VersionDaoFactory;
+
+public class VersionDaoFactoryImpl extends VersionDaoFactory {
+
+  private static final VersionDao INSTANCE = new VersionDaoImpl();
+
+  @Override
+  public VersionDao createInterface(SessionContext context) {
+    return INSTANCE;
+  }
+}
diff --git a/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/impl/cassandra/VersionDaoImpl.java b/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/impl/cassandra/VersionDaoImpl.java
new file mode 100644
index 0000000000..bba2ddf267
--- /dev/null
+++ b/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/impl/cassandra/VersionDaoImpl.java
@@ -0,0 +1,185 @@
+package org.openecomp.core.zusammen.plugin.dao.impl.cassandra;
+
+import com.amdocs.zusammen.datatypes.Id;
+import com.amdocs.zusammen.datatypes.SessionContext;
+import com.datastax.driver.core.ResultSet;
+import com.datastax.driver.core.Row;
+import com.datastax.driver.mapping.annotations.Accessor;
+import com.datastax.driver.mapping.annotations.Query;
+import org.openecomp.core.zusammen.plugin.dao.VersionDao;
+import org.openecomp.core.zusammen.plugin.dao.types.VersionEntity;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Date;
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+import java.util.stream.Collectors;
+
+import static java.util.stream.Collectors.toMap;
+
+public class VersionDaoImpl implements VersionDao {
+
+  @Override
+  public void create(SessionContext context, String space, Id itemId, VersionEntity version) {
+    String baseVersion = version.getBaseId() != null ? version.getBaseId().toString() : null;
+
+    getAccessor(context)
+        .create(space, itemId.toString(), version.getId().toString(),
+            baseVersion,
+            version.getCreationTime(), version.getModificationTime());
+
+  }
+
+  @Override
+  public void delete(SessionContext context, String space, Id itemId, Id versionId) {
+
+    getAccessor(context).delete(space, itemId.toString(), versionId.toString());
+  }
+
+  @Override
+  public void updateModificationTime(SessionContext context, String space, Id itemId,
+                                     Id versionId, Date modificationTime) {
+    getAccessor(context)
+        .updateModificationTime(modificationTime, space, itemId.toString(), versionId.toString());
+  }
+
+
+  @Override
+  public Collection<VersionEntity> list(SessionContext context, String space, Id itemId) {
+    List<Row> rows = getAccessor(context).list(space, itemId.toString()).all();
+    return rows == null ? new ArrayList<>() :
+        rows.stream().map(VersionDaoImpl::convertToVersionEntity).collect(Collectors.toList());
+  }
+
+
+  @Override
+  public Optional<VersionEntity> get(SessionContext context, String space, Id itemId,
+                                     Id versionId) {
+    Row row;
+
+    row = getAccessor(context).get(space, itemId.toString(), versionId.toString()).one();
+
+
+    return row == null ? Optional.empty() : Optional.of(convertToVersionEntity(row));
+  }
+
+  @Override
+  public boolean checkHealth(SessionContext context) {
+    return getAccessor(context).checkHealth().getColumnDefinitions()
+        .contains(VersionField.VERSION_ID);
+  }
+
+  @Override
+  public void createVersionElements(SessionContext context, String space, Id itemId,
+                                    Id versionId, Id revisionId, Map<Id, Id> versionElementIds,
+                                    Date publishTime, String message) {
+    Map<String, String> elementIds = versionElementIds==null?null:versionElementIds.
+        entrySet().
+        stream().
+        collect(toMap((Map.Entry<Id, Id>entry)->entry.getKey().getValue(),
+                      (Map.Entry<Id, Id>entry)->entry.getValue().getValue()));
+
+    getVersionElementsAccessor(context).create(space,itemId.toString(),versionId.toString(),
+        revisionId.getValue(),elementIds,publishTime,message,context.getUser().getUserName());
+  }
+
+
+  private static VersionEntity convertToVersionEntity(Row row) {
+
+    /*Id revisionId =  row.getColumnDefinitions().contains("revision_id")?new Id(row.getString
+        (VersionField.REVISION_ID)):null;*/
+
+    VersionEntity version = new VersionEntity(new Id(row.getString(VersionField.VERSION_ID)));
+    return enrichVersionEntity(version, row);
+  }
+
+  static VersionEntity enrichVersionEntity(VersionEntity version, Row row) {
+    version.setBaseId(new Id(row.getString(VersionField.BASE_VERSION_ID)));
+    version.setCreationTime(row.getDate(VersionField.CREATION_TIME));
+    version.setModificationTime(row.getDate(VersionField.MODIFICATION_TIME));
+    return version;
+  }
+
+  private VersionAccessor getAccessor(SessionContext context) {
+    return CassandraDaoUtils.getAccessor(context, VersionAccessor.class);
+  }
+
+  private VersionElementsAccessor getVersionElementsAccessor(SessionContext context) {
+    return CassandraDaoUtils.getAccessor(context, VersionElementsAccessor.class);
+  }
+
+  @Accessor
+  interface VersionAccessor {
+
+    @Query(
+        "INSERT INTO version (space, item_id, version_id, base_version_id, " +
+            "creation_time, " +
+            "modification_time) " +
+            "VALUES (?, ?, ?, ?, ?, ?)")
+    void create(String space, String itemId, String versionId, String baseVersionId,
+                Date creationTime, Date modificationTime);
+
+    @Query("UPDATE version SET modification_time=? WHERE space=? AND item_id=? AND version_id=? ")
+    void updateModificationTime(Date modificationTime, String space, String itemId,
+                                String versionId);
+
+    @Query("DELETE FROM version WHERE space=? AND item_id=? AND version_id=? ")
+    void delete(String space, String itemId, String versionId);
+
+    @Query("SELECT version_id, base_version_id, creation_time, modification_time " +
+        "FROM version WHERE space=? AND item_id=? AND version_id=?  ")
+    ResultSet get(String space, String itemId, String versionId);
+
+    /*@Query("SELECT version_id, base_version_id, creation_time, modification_time " +
+        "FROM version WHERE space=? AND item_id=? AND version_id=? ")
+    ResultSet get(String space, String itemId, String versionId);*/
+
+
+    @Query("SELECT version_id, base_version_id, creation_time, modification_time " +
+        "FROM version WHERE space=? AND item_id=?")
+    ResultSet list(String space, String itemId);
+
+    @Query("SELECT version_id FROM version LIMIT 1")
+    ResultSet checkHealth();
+  }
+
+  private static final class VersionField {
+    private static final String VERSION_ID = "version_id";
+    private static final String BASE_VERSION_ID = "base_version_id";
+    private static final String CREATION_TIME = "creation_time";
+    private static final String MODIFICATION_TIME = "modification_time";
+    //private static final String REVISION_ID = "revision_id";
+  }
+
+  @Accessor
+  interface VersionElementsAccessor {
+
+    @Query("INSERT INTO version_elements (space,item_id,version_id,revision_id,element_ids," +
+        "publish_time,message,user) " +
+        "VALUES (?,?,?,?,?,?,?,?)")
+    void create(String space,
+                String itemId,
+                String versionId,
+                String versionRevisionId,
+                Map<String,String> elementIds,
+                Date publishTime,
+                String message,
+                String user);
+
+
+
+  }
+
+ /* public static final class VersionElementsField {
+    private static final String SPACE = "space";
+    private static final String ITEM_ID = "item_id";
+    private static final String VERSION_ID = "version_id";
+    private static final String ELEMENT_IDS = "element_ids";
+    private static final String REVISION_ID = "revision_id";
+
+  }*/
+
+
+}
diff --git a/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/impl/cassandra/VersionStageRepositoryFactoryImpl.java b/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/impl/cassandra/VersionStageRepositoryFactoryImpl.java
new file mode 100644
index 0000000000..547bf6a06c
--- /dev/null
+++ b/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/impl/cassandra/VersionStageRepositoryFactoryImpl.java
@@ -0,0 +1,15 @@
+package org.openecomp.core.zusammen.plugin.dao.impl.cassandra;
+
+import com.amdocs.zusammen.datatypes.SessionContext;
+import org.openecomp.core.zusammen.plugin.dao.VersionStageRepository;
+import org.openecomp.core.zusammen.plugin.dao.VersionStageRepositoryFactory;
+
+public class VersionStageRepositoryFactoryImpl extends VersionStageRepositoryFactory {
+
+  private static final VersionStageRepository INSTANCE = new VersionStageRepositoryImpl();
+
+  @Override
+  public VersionStageRepository createInterface(SessionContext context) {
+    return INSTANCE;
+  }
+}
diff --git a/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/impl/cassandra/VersionStageRepositoryImpl.java b/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/impl/cassandra/VersionStageRepositoryImpl.java
new file mode 100644
index 0000000000..353f37b91b
--- /dev/null
+++ b/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/impl/cassandra/VersionStageRepositoryImpl.java
@@ -0,0 +1,82 @@
+package org.openecomp.core.zusammen.plugin.dao.impl.cassandra;
+
+import com.amdocs.zusammen.datatypes.SessionContext;
+import com.amdocs.zusammen.datatypes.item.Action;
+import com.datastax.driver.core.ResultSet;
+import com.datastax.driver.core.Row;
+import com.datastax.driver.mapping.annotations.Accessor;
+import com.datastax.driver.mapping.annotations.Query;
+import org.openecomp.core.zusammen.plugin.dao.VersionStageRepository;
+import org.openecomp.core.zusammen.plugin.dao.types.StageEntity;
+import org.openecomp.core.zusammen.plugin.dao.types.VersionContext;
+import org.openecomp.core.zusammen.plugin.dao.types.VersionEntity;
+
+import java.util.Date;
+import java.util.Optional;
+
+public class VersionStageRepositoryImpl implements VersionStageRepository {
+
+  @Override
+  public Optional<StageEntity<VersionEntity>> get(SessionContext context,
+                                                  VersionContext entityContext,
+                                                  VersionEntity entity) {
+    Row row = getAccessor(context)
+        .get(entityContext.getSpace(), entityContext.getItemId().toString(),
+            entity.getId().toString()).one();
+    return row == null ? Optional.empty() : Optional.of(convertToVersionStage(entity, row));
+  }
+
+  @Override
+  public void create(SessionContext context, VersionContext entityContext,
+                     StageEntity<VersionEntity> stageEntity) {
+    VersionEntity entity = stageEntity.getEntity();
+    getAccessor(context).create(entityContext.getSpace(),
+        entityContext.getItemId().toString(),
+        entity.getId().toString(),
+        entity.getBaseId() == null ? null : entity.getBaseId().toString(),
+        entity.getCreationTime() == null ? null : entity.getCreationTime(),
+        entity.getModificationTime() == null ? null : entity.getModificationTime(),
+        stageEntity.getPublishTime(),
+        stageEntity.getAction());
+  }
+
+  @Override
+  public void delete(SessionContext context, VersionContext entityContext, VersionEntity entity) {
+    getAccessor(context).delete(entityContext.getSpace(), entityContext.getItemId().toString(),
+        entity.getId().toString());
+  }
+
+  private StageEntity<VersionEntity> convertToVersionStage(VersionEntity version, Row row) {
+    StageEntity<VersionEntity> versionStage =
+        new StageEntity<>(VersionDaoImpl.enrichVersionEntity(version, row),
+            row.getDate(VersionStageField.PUBLISH_TIME));
+    versionStage.setAction(Action.valueOf(row.getString(VersionStageField.ACTION)));
+    return versionStage;
+  }
+
+  private VersionStageAccessor getAccessor(SessionContext context) {
+    return CassandraDaoUtils.getAccessor(context, VersionStageAccessor.class);
+  }
+
+  @Accessor
+  interface VersionStageAccessor {
+
+    @Query("INSERT INTO version_stage (space, item_id, version_id, base_version_id, " +
+        "creation_time, modification_time, publish_time, action) " +
+        "VALUES (?, ?, ?, ?, ?, ?, ?, ?)")
+    void create(String space, String itemId, String versionId, String baseVersionId,
+                Date creationTime, Date modificationTime, Date publishTime, Action action);
+
+    @Query("DELETE FROM version_stage WHERE space=? AND item_id=? AND version_id=?")
+    void delete(String space, String itemId, String versionId);
+
+    @Query("SELECT base_version_id, creation_time, modification_time, publish_time, action " +
+        "FROM  version_stage WHERE space=? AND item_id=? AND version_id=?")
+    ResultSet get(String space, String itemId, String versionId);
+  }
+
+  private static final class VersionStageField {
+    private static final String PUBLISH_TIME = "publish_time";
+    private static final String ACTION = "action";
+  }
+}
diff --git a/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/impl/cassandra/VersionSynchronizationStateRepositoryFactoryImpl.java b/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/impl/cassandra/VersionSynchronizationStateRepositoryFactoryImpl.java
new file mode 100644
index 0000000000..95c3ec2730
--- /dev/null
+++ b/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/impl/cassandra/VersionSynchronizationStateRepositoryFactoryImpl.java
@@ -0,0 +1,33 @@
+/*
+ * Copyright © 2016-2017 European Support Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.openecomp.core.zusammen.plugin.dao.impl.cassandra;
+
+import com.amdocs.zusammen.datatypes.SessionContext;
+import org.openecomp.core.zusammen.plugin.dao.VersionSynchronizationStateRepository;
+import org.openecomp.core.zusammen.plugin.dao.VersionSynchronizationStateRepositoryFactory;
+
+public class VersionSynchronizationStateRepositoryFactoryImpl
+    extends VersionSynchronizationStateRepositoryFactory {
+
+  private static final VersionSynchronizationStateRepository INSTANCE =
+      new VersionSynchronizationStateRepositoryImpl();
+
+  @Override
+  public VersionSynchronizationStateRepository createInterface(SessionContext context) {
+    return INSTANCE;
+  }
+}
diff --git a/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/impl/cassandra/VersionSynchronizationStateRepositoryImpl.java b/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/impl/cassandra/VersionSynchronizationStateRepositoryImpl.java
new file mode 100644
index 0000000000..5fb9779bc2
--- /dev/null
+++ b/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/impl/cassandra/VersionSynchronizationStateRepositoryImpl.java
@@ -0,0 +1,137 @@
+package org.openecomp.core.zusammen.plugin.dao.impl.cassandra;
+
+import com.amdocs.zusammen.datatypes.Id;
+import com.amdocs.zusammen.datatypes.SessionContext;
+import com.datastax.driver.core.ResultSet;
+import com.datastax.driver.core.Row;
+import com.datastax.driver.mapping.annotations.Accessor;
+import com.datastax.driver.mapping.annotations.Query;
+import org.openecomp.core.zusammen.plugin.dao.VersionSynchronizationStateRepository;
+import org.openecomp.core.zusammen.plugin.dao.types.SynchronizationStateEntity;
+import org.openecomp.core.zusammen.plugin.dao.types.VersionContext;
+import org.openecomp.core.zusammen.plugin.dao.types.VersionEntity;
+
+import java.util.ArrayList;
+import java.util.Date;
+import java.util.List;
+import java.util.Optional;
+import java.util.stream.Collectors;
+
+public class VersionSynchronizationStateRepositoryImpl
+    implements VersionSynchronizationStateRepository {
+
+  @Override
+  public void create(SessionContext context, VersionContext entityContext,
+                     SynchronizationStateEntity syncStateEntity) {
+    updatePublishTime(context, entityContext, syncStateEntity);
+  }
+
+  @Override
+  public void updatePublishTime(SessionContext context, VersionContext entityContext,
+                                SynchronizationStateEntity syncStateEntity) {
+    getAccessor(context)
+        .updatePublishTime(syncStateEntity.getPublishTime(), entityContext.getSpace(),
+            entityContext.getItemId().toString(), syncStateEntity.getId().toString(),
+            syncStateEntity.getRevisionId().getValue());
+  }
+
+  @Override
+  public List<SynchronizationStateEntity> list(SessionContext context, VersionContext
+      entityContext, VersionEntity versionEntity) {
+
+    List<Row> rows = getAccessor(context).list(entityContext.getSpace(), entityContext.getItemId().toString
+        (),versionEntity.getId().toString()).all();
+    return rows == null ? new ArrayList<>():
+        rows.stream().map(VersionSynchronizationStateRepositoryImpl::getSynchronizationStateEntity).collect(Collectors.toList());
+  }
+
+
+
+  /*@Override
+  public List<SynchronizationStateEntity> listRevisions(SessionContext context,
+                                                        VersionContext entityContext,
+                                                        SynchronizationStateEntity syncStateEntity) {
+    List<Row> rows = getAccessor(context).list(entityContext.getSpace(), entityContext.getItemId()
+        .toString(), syncStateEntity.getId().toString()).all();
+    return rows == null ? new ArrayList<>() :rows.stream()
+        .map(VersionSynchronizationStateRepositoryImpl::getSynchronizationStateEntity)
+        .collect(Collectors.toList());
+
+
+
+
+    //forEach(row -> getSynchronizationStateEntity(syncStateEntity.getId(), row));
+
+
+  }*/
+
+
+  @Override
+  public void delete(SessionContext context, VersionContext entityContext,
+                     SynchronizationStateEntity syncStateEntity) {
+    // done by version dao
+  }
+
+  @Override
+  public Optional<SynchronizationStateEntity> get(SessionContext context,
+                                                  VersionContext entityContext,
+                                                  SynchronizationStateEntity syncStateEntity) {
+    Row row =
+        getAccessor(context).get(entityContext.getSpace(), entityContext.getItemId().toString(),
+            syncStateEntity.getId().toString(), syncStateEntity.getRevisionId().getValue()).one();
+
+    return row == null ? Optional.empty()
+        : Optional.of(getSynchronizationStateEntity(syncStateEntity.getId(), row));
+  }
+
+  private SynchronizationStateEntity getSynchronizationStateEntity(Id entityId, Row row) {
+    SynchronizationStateEntity syncStateEntity = new SynchronizationStateEntity(entityId,
+        new Id(row.getString(REVISION_ID_FIELD)));
+    syncStateEntity.setPublishTime(row.getDate(PUBLISH_TIME_FIELD));
+    syncStateEntity.setDirty(!row.getSet(DIRTY_ELEMENT_FIELD, String.class).isEmpty());
+    return syncStateEntity;
+  }
+
+  private static SynchronizationStateEntity getSynchronizationStateEntity(Row row) {
+    Id entityId = new Id(row.getColumnDefinitions().contains("version_id") ? row.getString
+        ("version_id") : row.getString("element_id"));
+    SynchronizationStateEntity syncStateEntity = new SynchronizationStateEntity(entityId,
+        new Id(row.getString(REVISION_ID_FIELD)));
+    syncStateEntity.setPublishTime(row.getDate(PUBLISH_TIME_FIELD));
+    syncStateEntity.setDirty(!row.getSet(DIRTY_ELEMENT_FIELD, String.class).isEmpty());
+    syncStateEntity.setRevisionId(new Id(row.getString(REVISION_ID_FIELD)));
+    syncStateEntity.setUser(row.getString(USER));
+    syncStateEntity.setMessage(row.getString(MESSAGE));
+    return syncStateEntity;
+  }
+
+  private VersionSyncStateAccessor getAccessor(SessionContext context) {
+    return CassandraDaoUtils.getAccessor(context, VersionSyncStateAccessor.class);
+  }
+
+  @Accessor
+  interface VersionSyncStateAccessor {
+    @Query(
+        "UPDATE version_elements SET publish_time=? WHERE space=? AND item_id=? AND version_id=? " +
+            "AND revision_id=? ")
+    void updatePublishTime(Date publishTime, String space, String itemId, String versionId, String
+        revisionId);
+
+    @Query("SELECT version_id,revision_id,publish_time, dirty_element_ids FROM version_elements " +
+        "WHERE space=? AND item_id=? AND version_id=? AND revision_id=? ")
+    ResultSet get(String space, String itemId, String versionId, String revisionId);
+
+    @Query("SELECT version_id,revision_id,publish_time,user,message, dirty_element_ids FROM " +
+        "version_elements " +
+        "WHERE space=? AND item_id=? AND version_id=? ")
+    ResultSet list(String space, String itemId, String versionId);
+
+  }
+
+
+  private static final String PUBLISH_TIME_FIELD = "publish_time";
+  private static final String DIRTY_ELEMENT_FIELD = "dirty_element_ids";
+  private static final String REVISION_ID_FIELD = "revision_id";
+  private static final String USER = "user";
+  private static final String MESSAGE = "message";
+}
diff --git a/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/types/ElementEntity.java b/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/types/ElementEntity.java
index 1663d83427..1cd15102f2 100644
--- a/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/types/ElementEntity.java
+++ b/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/types/ElementEntity.java
@@ -30,6 +30,7 @@ public class ElementEntity {
   private Id id;
   private Id parentId;
   private Namespace namespace;
+  private Id elementHash;
   private Info info;
   private Collection<Relation> relations = Collections.emptyList();
   private ByteBuffer data;
@@ -41,6 +42,10 @@ public class ElementEntity {
     this.id = id;
   }
 
+  public Id getId() {
+    return id;
+  }
+
   public Id getParentId() {
     return parentId;
   }
@@ -49,14 +54,6 @@ public class ElementEntity {
     this.parentId = parentId;
   }
 
-  public Id getId() {
-    return id;
-  }
-
-  public void setId(Id id) {
-    this.id = id;
-  }
-
   public Namespace getNamespace() {
     return namespace;
   }
@@ -127,8 +124,17 @@ public class ElementEntity {
     return id.equals(that.id);
   }
 
+  public Id getElementHash() {
+    return elementHash;
+  }
+
+  public void setElementHash(Id elementHash) {
+    this.elementHash = elementHash;
+  }
+
   @Override
   public int hashCode() {
     return id.hashCode();
   }
+
 }
diff --git a/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/types/StageEntity.java b/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/types/StageEntity.java
new file mode 100644
index 0000000000..58ac0a918a
--- /dev/null
+++ b/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/types/StageEntity.java
@@ -0,0 +1,60 @@
+package org.openecomp.core.zusammen.plugin.dao.types;
+
+import com.amdocs.zusammen.datatypes.item.Action;
+
+import java.util.Collections;
+import java.util.Date;
+import java.util.Set;
+
+public class StageEntity<E> {
+  private E entity;
+  private Date publishTime;
+  private Action action = Action.IGNORE;
+  private boolean conflicted;
+  private Set<E> conflictDependents = Collections.emptySet();
+
+  // used by sync on stage creation
+  public StageEntity(E entity, Date publishTime) {
+    this.entity = entity;
+    this.publishTime = publishTime;
+  }
+
+  public StageEntity(E entity, Date publishTime, Action action, boolean conflicted) {
+    this.entity = entity;
+    this.publishTime = publishTime;
+    this.action = action;
+    this.conflicted = conflicted;
+  }
+
+  public E getEntity() {
+    return entity;
+  }
+
+  public Date getPublishTime() {
+    return publishTime;
+  }
+
+  public Action getAction() {
+    return action;
+  }
+
+  public void setAction(Action action) {
+    this.action = action;
+  }
+
+  public boolean isConflicted() {
+    return conflicted;
+  }
+
+  public void setConflicted(boolean conflicted) {
+    this.conflicted = conflicted;
+  }
+
+  public Set<E> getConflictDependents() {
+    return conflictDependents;
+  }
+
+  public void setConflictDependents(Set<E> conflictDependents) {
+    this.conflictDependents = conflictDependents;
+  }
+}
diff --git a/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/types/SynchronizationStateEntity.java b/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/types/SynchronizationStateEntity.java
new file mode 100644
index 0000000000..510cef820b
--- /dev/null
+++ b/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/types/SynchronizationStateEntity.java
@@ -0,0 +1,116 @@
+/*
+ * Copyright © 2016-2017 European Support Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.openecomp.core.zusammen.plugin.dao.types;
+
+import com.amdocs.zusammen.datatypes.Id;
+
+import java.util.Date;
+
+/**
+ * Synchronization state of an entity:
+ * <ul>
+ * <li>On private entity edit (create/update/delete): marked as dirty</li>
+ * <li>On entity publication:
+ * <ul>
+ * <li>if the private entity exists - updated with the publish time, marked as not dirty</li>
+ * <li>Otherwise - deleted</li>
+ * </ul>
+ * </li>
+ * </ul>
+ */
+public class SynchronizationStateEntity {
+  private Id id;
+  private Id revisionId;
+  private Date publishTime;
+  private boolean dirty;
+  private String user;
+  private String message;
+
+  public SynchronizationStateEntity(Id id,Id revisionId) {
+    this.id = id;
+    this.revisionId = revisionId;
+  }
+
+  public SynchronizationStateEntity(Id id,Id revisionId, Date publishTime, boolean dirty) {
+    this(id,revisionId);
+    this.publishTime = publishTime;
+    this.dirty = dirty;
+  }
+
+  public Id getId() {
+    return id;
+  }
+
+  public Date getPublishTime() {
+    return publishTime;
+  }
+
+  public void setPublishTime(Date publishTime) {
+    this.publishTime = publishTime;
+  }
+
+  public boolean isDirty() {
+    return dirty;
+  }
+
+  public void setDirty(boolean dirty) {
+    this.dirty = dirty;
+  }
+
+  public Id getRevisionId() {
+    return revisionId;
+  }
+
+  public void setRevisionId(Id revisionId) {
+    this.revisionId = revisionId;
+  }
+
+  public String getUser() {
+    return user;
+  }
+
+  public void setUser(String user) {
+    this.user = user;
+  }
+
+  public String getMessage() {
+    return message;
+  }
+
+  public void setMessage(String message) {
+    this.message = message;
+  }
+
+  @Override
+  public boolean equals(Object o) {
+    if (this == o) {
+      return true;
+    }
+    if (o == null || getClass() != o.getClass()) {
+      return false;
+    }
+
+    SynchronizationStateEntity that = (SynchronizationStateEntity) o;
+
+    return id.equals(that.id);
+  }
+
+  @Override
+  public int hashCode() {
+    return id.hashCode();
+  }
+}
diff --git a/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/types/VersionContext.java b/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/types/VersionContext.java
new file mode 100644
index 0000000000..41a3e66e0e
--- /dev/null
+++ b/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/types/VersionContext.java
@@ -0,0 +1,23 @@
+package org.openecomp.core.zusammen.plugin.dao.types;
+
+import com.amdocs.zusammen.datatypes.Id;
+
+public class VersionContext {
+  private String space;
+  private Id itemId;
+
+
+  public VersionContext(String space, Id itemId) {
+    this.space = space;
+    this.itemId = itemId;
+  }
+
+  public String getSpace() {
+    return space;
+  }
+
+  public Id getItemId() {
+    return itemId;
+  }
+
+}
diff --git a/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/types/VersionDataElement.java b/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/types/VersionDataElement.java
new file mode 100644
index 0000000000..48a52c0d85
--- /dev/null
+++ b/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/types/VersionDataElement.java
@@ -0,0 +1,21 @@
+package org.openecomp.core.zusammen.plugin.dao.types;
+
+import com.amdocs.zusammen.datatypes.Id;
+import com.amdocs.zusammen.datatypes.item.ItemVersionData;
+import org.openecomp.core.zusammen.plugin.ZusammenPluginConstants;
+
+import static org.openecomp.core.zusammen.plugin.ZusammenPluginUtil.calculateElementHash;
+
+public class VersionDataElement extends ElementEntity {
+
+  public VersionDataElement() {
+    super(ZusammenPluginConstants.ROOT_ELEMENTS_PARENT_ID);
+  }
+
+  public VersionDataElement(ItemVersionData itemVersionData) {
+    this();
+    setInfo(itemVersionData.getInfo());
+    setRelations(itemVersionData.getRelations());
+    setElementHash(new Id(calculateElementHash(this)));
+  }
+}
diff --git a/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/types/VersionEntity.java b/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/types/VersionEntity.java
new file mode 100644
index 0000000000..aeed998d96
--- /dev/null
+++ b/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-plugin/src/main/java/org/openecomp/core/zusammen/plugin/dao/types/VersionEntity.java
@@ -0,0 +1,45 @@
+package org.openecomp.core.zusammen.plugin.dao.types;
+
+import com.amdocs.zusammen.datatypes.Id;
+
+import java.util.Date;
+
+public class VersionEntity {
+  private Id id;
+  private Id baseId;
+  private Date creationTime;
+  private Date modificationTime;
+
+  public VersionEntity(Id id) {
+    this.id = id;
+  }
+
+  public Id getId() {
+    return id;
+  }
+
+  public Id getBaseId() {
+    return baseId;
+  }
+
+  public void setBaseId(Id baseId) {
+    this.baseId = baseId;
+  }
+
+  public Date getCreationTime() {
+    return creationTime;
+  }
+
+  public void setCreationTime(Date creationTime) {
+    this.creationTime = creationTime;
+  }
+
+  public Date getModificationTime() {
+    return modificationTime;
+  }
+
+  public void setModificationTime(Date modificationTime) {
+    this.modificationTime = modificationTime;
+  }
+
+}