Initial OpenECOMP A&AI Model Loader commit

Change-Id: Iae343fa01ecc701919703fb7d61727555371321d
Signed-off-by: Steve Smokowski <ss835w@att.com>

17 files changed, 2348 insertions, 0 deletions

diff --git a/src/main/java/org/openecomp/modelloader/config/ModelLoaderConfig.java b/src/main/java/org/openecomp/modelloader/config/ModelLoaderConfig.java
new file mode 100644
index 0000000..26f13ad
--- /dev/null
+++ b/src/main/java/org/openecomp/modelloader/config/ModelLoaderConfig.java
@@ -0,0 +1,235 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * MODEL LOADER SERVICE
+ * ================================================================================
+ * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.openecomp.modelloader.config;
+
+import org.eclipse.jetty.util.security.Password;
+import org.openecomp.sdc.api.consumer.IConfiguration;
+
+import java.io.File;
+import java.net.URL;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Properties;
+
+public class ModelLoaderConfig implements IConfiguration {
+
+  // Configuration file structure
+  public static final String PREFIX_MODEL_LOADER_CONFIG = "ml";
+  public static final String PREFIX_DISTRIBUTION_CLIENT = 
+      PREFIX_MODEL_LOADER_CONFIG + ".distribution.";
+  public static final String PREFIX_AAI = PREFIX_MODEL_LOADER_CONFIG + ".aai.";
+  public static final String PREFIX_DEBUG = PREFIX_MODEL_LOADER_CONFIG + ".debug.";
+
+  // Configuration file properties
+  protected static final String PROP_ML_DISTRIBUTION_ACTIVE_SERVER_TLS_AUTH = 
+      PREFIX_DISTRIBUTION_CLIENT + "ACTIVE_SERVER_TLS_AUTH";
+  protected static final String PROP_ML_DISTRIBUTION_ASDC_ADDRESS = PREFIX_DISTRIBUTION_CLIENT
+      + "ASDC_ADDRESS";
+  protected static final String PROP_ML_DISTRIBUTION_CONSUMER_GROUP = PREFIX_DISTRIBUTION_CLIENT
+      + "CONSUMER_GROUP";
+  protected static final String PROP_ML_DISTRIBUTION_CONSUMER_ID = PREFIX_DISTRIBUTION_CLIENT
+      + "CONSUMER_ID";
+  protected static final String PROP_ML_DISTRIBUTION_ENVIRONMENT_NAME = PREFIX_DISTRIBUTION_CLIENT
+      + "ENVIRONMENT_NAME";
+  protected static final String PROP_ML_DISTRIBUTION_KEYSTORE_PASSWORD = PREFIX_DISTRIBUTION_CLIENT
+      + "KEYSTORE_PASSWORD";
+  protected static final String PROP_ML_DISTRIBUTION_KEYSTORE_FILE = PREFIX_DISTRIBUTION_CLIENT
+      + "KEYSTORE_FILE";
+  protected static final String PROP_ML_DISTRIBUTION_PASSWORD = PREFIX_DISTRIBUTION_CLIENT
+      + "PASSWORD";
+  protected static final String PROP_ML_DISTRIBUTION_POLLING_INTERVAL = PREFIX_DISTRIBUTION_CLIENT
+      + "POLLING_INTERVAL";
+  protected static final String PROP_ML_DISTRIBUTION_POLLING_TIMEOUT = PREFIX_DISTRIBUTION_CLIENT
+      + "POLLING_TIMEOUT";
+  protected static final String PROP_ML_DISTRIBUTION_USER = PREFIX_DISTRIBUTION_CLIENT + "USER";
+  protected static final String PROP_ML_DISTRIBUTION_ARTIFACT_TYPES = PREFIX_DISTRIBUTION_CLIENT
+      + "ARTIFACT_TYPES";
+
+  protected static final String PROP_AAI_BASE_URL = PREFIX_AAI + "BASE_URL";
+  protected static final String PROP_AAI_KEYSTORE_FILE = PREFIX_AAI + "KEYSTORE_FILE";
+  protected static final String PROP_AAI_KEYSTORE_PASSWORD = PREFIX_AAI + "KEYSTORE_PASSWORD";
+  protected static final String PROP_AAI_MODEL_RESOURCE_URL = PREFIX_AAI + "MODEL_URL";
+  protected static final String PROP_AAI_NAMED_QUERY_RESOURCE_URL = PREFIX_AAI + "NAMED_QUERY_URL";
+  protected static final String PROP_AAI_VNF_IMAGE_RESOURCE_URL = PREFIX_AAI + "VNF_IMAGE_URL";
+  protected static final String PROP_AAI_AUTHENTICATION_USER = PREFIX_AAI + "AUTH_USER";
+  protected static final String PROP_AAI_AUTHENTICATION_PASSWORD = PREFIX_AAI + "AUTH_PASSWORD";
+
+  protected static final String PROP_DEBUG_INGEST_SIMULATOR = PREFIX_DEBUG + "INGEST_SIMULATOR";
+
+  private Properties modelLoaderProperties = null;
+
+  private String certLocation = ".";
+
+  private List<String> artifactTypes = null;
+
+  /**
+   * This is the class constructor.
+   * 
+   * @param modelLoaderProperties properties needed to be configured for the model loader
+   * @param certLocation location of the certificate
+   */
+  public ModelLoaderConfig(Properties modelLoaderProperties) {
+    this.modelLoaderProperties = modelLoaderProperties;
+    
+    String aaiKeystoreFile = modelLoaderProperties.getProperty(PROP_AAI_KEYSTORE_FILE);
+    if(aaiKeystoreFile != null){
+	    URL keystoreURL = this.getClass().getClassLoader().getResource(aaiKeystoreFile);
+	    if(keystoreURL != null){
+	    	File fKeystoreLocation = new File(keystoreURL.getPath());
+	    	this.certLocation = fKeystoreLocation.getParent();
+	    }
+    }
+
+    // Get list of artifacts
+    artifactTypes = new ArrayList<String>();
+    if (modelLoaderProperties.getProperty(PROP_ML_DISTRIBUTION_ARTIFACT_TYPES) != null) {
+      String[] artTypeList = modelLoaderProperties.getProperty(PROP_ML_DISTRIBUTION_ARTIFACT_TYPES)
+          .split(",");
+      for (String artType : artTypeList) {
+        artifactTypes.add(artType);
+      }
+    }
+  }
+
+  @Override
+  public boolean activateServerTLSAuth() {
+    String value = modelLoaderProperties.getProperty(PROP_ML_DISTRIBUTION_ACTIVE_SERVER_TLS_AUTH);
+    return value == null ? false : Boolean.parseBoolean(value);
+  }
+
+  @Override
+  public String getAsdcAddress() {
+    return modelLoaderProperties.getProperty(PROP_ML_DISTRIBUTION_ASDC_ADDRESS);
+  }
+
+  @Override
+  public String getConsumerGroup() {
+    return modelLoaderProperties.getProperty(PROP_ML_DISTRIBUTION_CONSUMER_GROUP);
+  }
+
+  @Override
+  public String getConsumerID() {
+    return modelLoaderProperties.getProperty(PROP_ML_DISTRIBUTION_CONSUMER_ID);
+  }
+
+  @Override
+  public String getEnvironmentName() {
+    return modelLoaderProperties.getProperty(PROP_ML_DISTRIBUTION_ENVIRONMENT_NAME);
+  }
+
+  @Override
+  public String getKeyStorePassword() {
+    return Password
+        .deobfuscate(modelLoaderProperties.getProperty(PROP_ML_DISTRIBUTION_KEYSTORE_PASSWORD));
+  }
+
+  @Override
+  public String getKeyStorePath() {
+    return certLocation + modelLoaderProperties.getProperty(PROP_ML_DISTRIBUTION_KEYSTORE_FILE);
+  }
+
+  @Override
+  public String getPassword() {
+    return Password.deobfuscate(modelLoaderProperties.getProperty(PROP_ML_DISTRIBUTION_PASSWORD));
+  }
+
+  @Override
+  public int getPollingInterval() {
+    return Integer
+        .parseInt(modelLoaderProperties.getProperty(PROP_ML_DISTRIBUTION_POLLING_INTERVAL));
+  }
+
+  @Override
+  public int getPollingTimeout() {
+    return Integer
+        .parseInt(modelLoaderProperties.getProperty(PROP_ML_DISTRIBUTION_POLLING_TIMEOUT));
+  }
+
+  @Override
+  public List<String> getRelevantArtifactTypes() {
+    return artifactTypes;
+  }
+
+  @Override
+  public String getUser() {
+    return modelLoaderProperties.getProperty(PROP_ML_DISTRIBUTION_USER);
+  }
+
+  public String getAaiKeyStorePath() {
+    return certLocation + "/" + modelLoaderProperties.getProperty(PROP_AAI_KEYSTORE_FILE);
+  }
+
+  public String getAaiKeyStorePassword() {
+    return Password.deobfuscate(modelLoaderProperties.getProperty(PROP_AAI_KEYSTORE_PASSWORD));
+  }
+
+  public String getAaiBaseUrl() {
+    return modelLoaderProperties.getProperty(PROP_AAI_BASE_URL);
+  }
+
+  public String getAaiModelUrl() {
+    return modelLoaderProperties.getProperty(PROP_AAI_MODEL_RESOURCE_URL);
+  }
+
+  public String getAaiNamedQueryUrl() {
+    return modelLoaderProperties.getProperty(PROP_AAI_NAMED_QUERY_RESOURCE_URL);
+  }
+
+  public String getAaiVnfImageUrl() {
+    return modelLoaderProperties.getProperty(PROP_AAI_VNF_IMAGE_RESOURCE_URL);
+  }
+
+  public String getAaiAuthenticationUser() {
+    return modelLoaderProperties.getProperty(PROP_AAI_AUTHENTICATION_USER);
+  }
+
+  /**
+   * @return password for AAI authentication that has been reverse-engineered
+   *         from its obfuscated form.
+   */
+  public String getAaiAuthenticationPassword() {
+    String password = Password
+        .deobfuscate(modelLoaderProperties.getProperty(PROP_AAI_AUTHENTICATION_PASSWORD));
+
+    if ((password != null) && (password.equals(""))) {
+      return null;
+    }
+
+    return password;
+  }
+
+  /**
+   * @return a boolean value indicating whether the simulator is enabled.
+   */
+  public boolean getIngestSimulatorEnabled() {
+    String propValue = modelLoaderProperties.getProperty(PROP_DEBUG_INGEST_SIMULATOR);
+
+    if (propValue == null) {
+      return false;
+    }
+
+    if (propValue.compareToIgnoreCase("enabled") == 0) {
+      return true;
+    }
+
+    return false;
+  }
+}
diff --git a/src/main/java/org/openecomp/modelloader/entity/Artifact.java b/src/main/java/org/openecomp/modelloader/entity/Artifact.java
new file mode 100644
index 0000000..fb0ec9f
--- /dev/null
+++ b/src/main/java/org/openecomp/modelloader/entity/Artifact.java
@@ -0,0 +1,44 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * MODEL LOADER SERVICE
+ * ================================================================================
+ * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.openecomp.modelloader.entity;
+
+public abstract class Artifact {
+
+  private String payload;
+  private ArtifactType type;
+
+  public ArtifactType getType() {
+    return type;
+  }
+
+  public void setType(ArtifactType type) {
+    this.type = type;
+  }
+
+  public String getPayload() {
+    return payload;
+  }
+
+  public void setPayload(String payload) {
+    this.payload = payload;
+  }
+
+}
diff --git a/src/main/java/org/openecomp/modelloader/entity/ArtifactHandler.java b/src/main/java/org/openecomp/modelloader/entity/ArtifactHandler.java
new file mode 100644
index 0000000..16f2c87
--- /dev/null
+++ b/src/main/java/org/openecomp/modelloader/entity/ArtifactHandler.java
@@ -0,0 +1,37 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * MODEL LOADER SERVICE
+ * ================================================================================
+ * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.openecomp.modelloader.entity;
+
+import org.openecomp.modelloader.config.ModelLoaderConfig;
+
+import java.util.List;
+
+public abstract class ArtifactHandler {
+
+  protected ModelLoaderConfig config;
+
+  public ArtifactHandler(ModelLoaderConfig config) {
+    this.config = config;
+  }
+
+  public abstract boolean pushArtifacts(List<Artifact> artifacts, String distributionId);
+
+}
diff --git a/src/main/java/org/openecomp/modelloader/entity/ArtifactType.java b/src/main/java/org/openecomp/modelloader/entity/ArtifactType.java
new file mode 100644
index 0000000..8977e3c
--- /dev/null
+++ b/src/main/java/org/openecomp/modelloader/entity/ArtifactType.java
@@ -0,0 +1,25 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * MODEL LOADER SERVICE
+ * ================================================================================
+ * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.openecomp.modelloader.entity;
+
+public enum ArtifactType {
+  MODEL, NAMED_QUERY, VNF_CATALOG;
+}
diff --git a/src/main/java/org/openecomp/modelloader/entity/catalog/VnfCatalogArtifact.java b/src/main/java/org/openecomp/modelloader/entity/catalog/VnfCatalogArtifact.java
new file mode 100644
index 0000000..b2e1fdb
--- /dev/null
+++ b/src/main/java/org/openecomp/modelloader/entity/catalog/VnfCatalogArtifact.java
@@ -0,0 +1,31 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * MODEL LOADER SERVICE
+ * ================================================================================
+ * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.openecomp.modelloader.entity.catalog;
+
+import org.openecomp.modelloader.entity.Artifact;
+import org.openecomp.modelloader.entity.ArtifactType;
+
+public class VnfCatalogArtifact extends Artifact {
+  public VnfCatalogArtifact(String payload) {
+    setPayload(payload);
+    setType(ArtifactType.VNF_CATALOG);
+  }
+}
diff --git a/src/main/java/org/openecomp/modelloader/entity/catalog/VnfCatalogArtifactHandler.java b/src/main/java/org/openecomp/modelloader/entity/catalog/VnfCatalogArtifactHandler.java
new file mode 100644
index 0000000..189b069
--- /dev/null
+++ b/src/main/java/org/openecomp/modelloader/entity/catalog/VnfCatalogArtifactHandler.java
@@ -0,0 +1,184 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * MODEL LOADER SERVICE
+ * ================================================================================
+ * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.openecomp.modelloader.entity.catalog;
+
+import com.sun.jersey.api.client.ClientResponse;
+
+import generated.VnfCatalog;
+import generated.VnfCatalog.PartNumberList;
+
+import inventory.aai.openecomp.org.v8.VnfImage;
+
+import org.eclipse.persistence.jaxb.MarshallerProperties;
+import org.openecomp.cl.api.Logger;
+import org.openecomp.cl.eelf.LoggerFactory;
+import org.openecomp.modelloader.config.ModelLoaderConfig;
+import org.openecomp.modelloader.entity.Artifact;
+import org.openecomp.modelloader.entity.ArtifactHandler;
+import org.openecomp.modelloader.restclient.AaiRestClient;
+import org.openecomp.modelloader.restclient.AaiRestClient.MimeType;
+import org.openecomp.modelloader.service.ModelLoaderMsgs;
+
+import java.io.StringReader;
+import java.io.StringWriter;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.UUID;
+
+import javax.ws.rs.core.Response;
+import javax.xml.bind.JAXBContext;
+import javax.xml.bind.JAXBException;
+import javax.xml.bind.Marshaller;
+import javax.xml.bind.Unmarshaller;
+
+
+public class VnfCatalogArtifactHandler extends ArtifactHandler {
+
+  private static Logger logger = LoggerFactory.getInstance()
+      .getLogger(VnfCatalogArtifactHandler.class.getName());
+
+  public VnfCatalogArtifactHandler(ModelLoaderConfig config) {
+    super(config);
+  }
+
+  @Override
+  public boolean pushArtifacts(List<Artifact> artifacts, String distributionId) {
+    for (Artifact art : artifacts) {
+      VnfCatalogArtifact vnfCatalog = (VnfCatalogArtifact) art;
+      String artifactPayload = vnfCatalog.getPayload();
+
+      AaiRestClient restClient = new AaiRestClient(this.config);
+      List<VnfImage> putImages = new ArrayList<VnfImage>();
+
+      try {
+        JAXBContext inputContext = JAXBContext.newInstance(VnfCatalog.class);
+        Unmarshaller unmarshaller = inputContext.createUnmarshaller();
+        StringReader reader = new StringReader(artifactPayload);
+        VnfCatalog cat = (VnfCatalog) unmarshaller.unmarshal(reader);
+
+        int numParts = cat.getPartNumberList().size();
+
+        for (int i = 0; i < numParts; i++) {
+
+          PartNumberList pnl = cat.getPartNumberList().get(i);
+
+          String application = pnl.getVendorInfo().getVendorModel();
+          String applicationVendor = pnl.getVendorInfo().getVendorName();
+
+          int numVersions = pnl.getSoftwareVersionList().size();
+
+          for (int j = 0; j < numVersions; j++) {
+            String applicationVersion = pnl.getSoftwareVersionList().get(j).getSoftwareVersion();
+
+            String imageId = "vnf image " + applicationVendor + " " + application + " "
+                + applicationVersion;
+
+            String getUrl = config.getAaiBaseUrl() + config.getAaiVnfImageUrl()
+                + "?application-vendor=" + applicationVendor + "&application=" + application
+                + "&application-version=" + applicationVersion;
+
+            ClientResponse tryGet = restClient.getResource(getUrl, distributionId, MimeType.JSON);
+            if (tryGet == null) {
+              logger.error(ModelLoaderMsgs.DISTRIBUTION_EVENT_ERROR,
+                  "Ingestion failed on " + imageId + ". Rolling back distribution.");
+              failureCleanup(putImages, restClient, distributionId);
+              return false;
+            }
+            if (tryGet.getStatus() == Response.Status.NOT_FOUND.getStatusCode()) {
+              // this vnf-image not already in the db, need to add
+              // only do this on 404 bc other error responses could mean there
+              // are problems that
+              // you might not want to try to PUT against
+
+              VnfImage image = new VnfImage();
+              image.setApplication(application);
+              image.setApplicationVendor(applicationVendor);
+              image.setApplicationVersion(applicationVersion);
+              String uuid = UUID.randomUUID().toString();
+              image.setUuid(uuid); // need to create uuid
+
+              System.setProperty("javax.xml.bind.context.factory",
+                  "org.eclipse.persistence.jaxb.JAXBContextFactory");
+              JAXBContext jaxbContext = JAXBContext.newInstance(VnfImage.class);
+              Marshaller marshaller = jaxbContext.createMarshaller();
+              marshaller.setProperty(MarshallerProperties.MEDIA_TYPE, "application/json");
+              marshaller.setProperty(MarshallerProperties.JSON_INCLUDE_ROOT, false);
+              marshaller.setProperty(MarshallerProperties.JSON_WRAPPER_AS_ARRAY_NAME, true);
+              marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, false);
+              StringWriter writer = new StringWriter();
+              marshaller.marshal(image, writer);
+              String payload = writer.toString();
+
+              String putUrl = config.getAaiBaseUrl() + config.getAaiVnfImageUrl() + "/vnf-image/"
+                  + uuid;
+
+              ClientResponse putResp = restClient.putResource(putUrl, payload, distributionId,
+                  MimeType.JSON);
+              if (putResp == null
+                  || putResp.getStatus() != Response.Status.CREATED.getStatusCode()) {
+                logger.error(ModelLoaderMsgs.DISTRIBUTION_EVENT_ERROR,
+                    "Ingestion failed on vnf-image " + imageId + ". Rolling back distribution.");
+                failureCleanup(putImages, restClient, distributionId);
+                return false;
+              }
+              putImages.add(image);
+              logger.info(ModelLoaderMsgs.DISTRIBUTION_EVENT, imageId + " successfully ingested.");
+            } else if (tryGet.getStatus() == Response.Status.OK.getStatusCode()) {
+              logger.info(ModelLoaderMsgs.DISTRIBUTION_EVENT,
+                  imageId + " already exists.  Skipping ingestion.");
+            } else {
+              // if other than 404 or 200, something went wrong
+              logger.error(ModelLoaderMsgs.DISTRIBUTION_EVENT_ERROR,
+                  "Ingestion failed on vnf-image " + imageId + " with status " + tryGet.getStatus()
+                      + ". Rolling back distribution.");
+              failureCleanup(putImages, restClient, distributionId);
+              return false;
+            }
+          }
+        }
+
+      } catch (JAXBException e) {
+        logger.error(ModelLoaderMsgs.DISTRIBUTION_EVENT_ERROR,
+            "Ingestion failed. " + e.getMessage() + ". Rolling back distribution.");
+        failureCleanup(putImages, restClient, distributionId);
+        return false;
+      }
+    }
+
+    return true;
+  }
+
+  /*
+   * if something fails in the middle of ingesting the catalog we want to
+   * rollback any changes to the db
+   */
+  private void failureCleanup(List<VnfImage> putImages, AaiRestClient restClient, String transId) {
+    for (VnfImage image : putImages) {
+      String url = config.getAaiBaseUrl() + config.getAaiVnfImageUrl() + "/vnf-image/"
+          + image.getUuid();
+      restClient.getAndDeleteResource(url, transId); // try to delete the image,
+                                                     // if something goes wrong
+                                                     // we can't really do
+                                                     // anything here
+    }
+  }
+
+}
diff --git a/src/main/java/org/openecomp/modelloader/entity/model/ModelArtifact.java b/src/main/java/org/openecomp/modelloader/entity/model/ModelArtifact.java
new file mode 100644
index 0000000..904dba9
--- /dev/null
+++ b/src/main/java/org/openecomp/modelloader/entity/model/ModelArtifact.java
@@ -0,0 +1,60 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * MODEL LOADER SERVICE
+ * ================================================================================
+ * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.openecomp.modelloader.entity.model;
+
+import org.openecomp.modelloader.entity.Artifact;
+
+import java.util.HashSet;
+import java.util.Set;
+
+public class ModelArtifact extends Artifact {
+
+  String nameVersionId;
+  Set<String> referencedModelIds = new HashSet<String>();
+
+  public String getNameVersionId() {
+    return nameVersionId;
+  }
+
+  public void setNameVersionId(String nameVersionId) {
+    this.nameVersionId = nameVersionId;
+  }
+
+  public Set<String> getDependentModelIds() {
+    return referencedModelIds;
+  }
+
+  public void addDependentModelId(String dependentModelId) {
+    this.referencedModelIds.add(dependentModelId);
+  }
+
+  @Override
+  public String toString() {
+    StringBuilder sb = new StringBuilder();
+    sb.append("NameVersId=" + nameVersionId + "(" + getType().toString() + ") ==> ");
+    for (String dep : referencedModelIds) {
+      sb.append(dep + "  ");
+    }
+
+    return sb.toString();
+  }
+
+}
diff --git a/src/main/java/org/openecomp/modelloader/entity/model/ModelArtifactHandler.java b/src/main/java/org/openecomp/modelloader/entity/model/ModelArtifactHandler.java
new file mode 100644
index 0000000..fb269b1
--- /dev/null
+++ b/src/main/java/org/openecomp/modelloader/entity/model/ModelArtifactHandler.java
@@ -0,0 +1,133 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * MODEL LOADER SERVICE
+ * ================================================================================
+ * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.openecomp.modelloader.entity.model;
+
+import com.sun.jersey.api.client.ClientResponse;
+
+import org.openecomp.cl.api.Logger;
+import org.openecomp.cl.eelf.LoggerFactory;
+import org.openecomp.modelloader.config.ModelLoaderConfig;
+import org.openecomp.modelloader.entity.Artifact;
+import org.openecomp.modelloader.entity.ArtifactHandler;
+import org.openecomp.modelloader.entity.ArtifactType;
+import org.openecomp.modelloader.restclient.AaiRestClient;
+import org.openecomp.modelloader.service.ModelLoaderMsgs;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import javax.ws.rs.core.Response;
+
+public class ModelArtifactHandler extends ArtifactHandler {
+
+  private static Logger logger = LoggerFactory.getInstance()
+      .getLogger(ArtifactHandler.class.getName());
+
+  public ModelArtifactHandler(ModelLoaderConfig config) {
+    super(config);
+  }
+
+  @Override
+  public boolean pushArtifacts(List<Artifact> artifacts, String distributionId) {
+    ModelSorter modelSorter = new ModelSorter();
+    List<Artifact> sortedModelArtifacts = modelSorter.sort(artifacts);
+
+    // Push the ordered list of model artifacts to A&AI. If one fails, we need
+    // to roll back
+    // the changes.
+    List<ModelArtifact> completedModels = new ArrayList<ModelArtifact>();
+    AaiRestClient aaiClient = new AaiRestClient(config);
+
+    for (Artifact art : sortedModelArtifacts) {
+      ModelArtifact model = (ModelArtifact) art;
+      ClientResponse getResponse = aaiClient.getResource(getUrl(model), distributionId,
+          AaiRestClient.MimeType.XML);
+      if ((getResponse == null)
+          || (getResponse.getStatus() != Response.Status.OK.getStatusCode())) {
+        // Only attempt the PUT if the model doesn't already exist
+        ClientResponse putResponse = aaiClient.putResource(getUrl(model), model.getPayload(),
+            distributionId, AaiRestClient.MimeType.XML);
+        if ((putResponse != null)
+            && (putResponse.getStatus() == Response.Status.CREATED.getStatusCode())) {
+          completedModels.add(model);
+          logger.info(ModelLoaderMsgs.DISTRIBUTION_EVENT, model.getType().toString() + " "
+              + model.getNameVersionId() + " successfully ingested.");
+        } else {
+          logger.error(ModelLoaderMsgs.DISTRIBUTION_EVENT_ERROR,
+              "Ingestion failed for " + model.getType().toString() + " " + model.getNameVersionId()
+                  + ". Rolling back distribution.");
+
+          for (ModelArtifact modelToDelete : completedModels) {
+            // Best effort to delete. Nothing we can do in the event this fails.
+            aaiClient.getAndDeleteResource(getUrl(modelToDelete), distributionId);
+          }
+
+          return false;
+        }
+      } else {
+        logger.info(ModelLoaderMsgs.DISTRIBUTION_EVENT, model.getType().toString() + " "
+            + model.getNameVersionId() + " already exists.  Skipping ingestion.");
+      }
+    }
+
+    return true;
+  }
+
+  private String getUrl(ModelArtifact model) {
+    String baseUrl = config.getAaiBaseUrl().trim();
+    String subUrl = null;
+    if (model.getType().equals(ArtifactType.MODEL)) {
+      subUrl = config.getAaiModelUrl().trim();
+    } else {
+      subUrl = config.getAaiNamedQueryUrl().trim();
+    }
+
+    if ((!baseUrl.endsWith("/")) && (!subUrl.startsWith("/"))) {
+      baseUrl = baseUrl + "/";
+    }
+
+    if (baseUrl.endsWith("/") && subUrl.startsWith("/")) {
+      baseUrl = baseUrl.substring(0, baseUrl.length() - 1);
+    }
+
+    if (!subUrl.endsWith("/")) {
+      subUrl = subUrl + "/";
+    }
+
+    String url = baseUrl + subUrl + model.getNameVersionId();
+    return url;
+  }
+
+  /**
+   * This method is used for the test REST interface to load models without an
+   * ASDC.
+   * 
+   * @param payload content of the request
+   */
+  public void loadModelTest(byte[] payload) {
+    List<Artifact> modelArtifacts = new ArrayList<Artifact>();
+    ModelArtifactParser parser = new ModelArtifactParser();
+    modelArtifacts.addAll(parser.parse(payload, "Test-Artifact"));
+    ModelSorter modelSorter = new ModelSorter();
+    List<Artifact> sortedModelArtifacts = modelSorter.sort(modelArtifacts);
+    pushArtifacts(sortedModelArtifacts, "Test-Distribution");
+  }
+}
diff --git a/src/main/java/org/openecomp/modelloader/entity/model/ModelArtifactParser.java b/src/main/java/org/openecomp/modelloader/entity/model/ModelArtifactParser.java
new file mode 100644
index 0000000..625145f
--- /dev/null
+++ b/src/main/java/org/openecomp/modelloader/entity/model/ModelArtifactParser.java
@@ -0,0 +1,197 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * MODEL LOADER SERVICE
+ * ================================================================================
+ * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.openecomp.modelloader.entity.model;
+
+import org.openecomp.cl.api.Logger;
+import org.openecomp.cl.eelf.LoggerFactory;
+import org.openecomp.modelloader.entity.Artifact;
+import org.openecomp.modelloader.entity.ArtifactType;
+import org.openecomp.modelloader.service.ModelLoaderMsgs;
+import org.openecomp.modelloader.util.JsonXmlConverter;
+import org.w3c.dom.Document;
+import org.w3c.dom.Node;
+import org.w3c.dom.NodeList;
+import org.xml.sax.InputSource;
+
+import java.io.StringReader;
+import java.io.StringWriter;
+import java.util.ArrayList;
+import java.util.List;
+
+import javax.xml.parsers.DocumentBuilder;
+import javax.xml.parsers.DocumentBuilderFactory;
+import javax.xml.transform.OutputKeys;
+import javax.xml.transform.Transformer;
+import javax.xml.transform.TransformerException;
+import javax.xml.transform.TransformerFactory;
+import javax.xml.transform.dom.DOMSource;
+import javax.xml.transform.stream.StreamResult;
+
+public class ModelArtifactParser {
+
+  private static String MODELS_ELEMENT = "models";
+  private static String MODEL_ELEMENT = "model";
+  private static String NAMED_QUERIES_ELEMENT = "named-queries";
+  private static String NAMED_QUERY_ELEMENT = "named-query";
+  private static String MODEL_NAME_VERSION_ID = "model-name-version-id";
+  private static String NAMED_QUERY_VERSION_ID = "named-query-uuid";
+  private static String RELATIONSHIP_DATA = "relationship-data";
+  private static String RELATIONSHIP_KEY = "relationship-key";
+  private static String RELATIONSHIP_VALUE = "relationship-value";
+  private static String MODEL_ELEMENT_RELATIONSHIP_KEY = "model.model-name-version-id";
+
+  private static Logger logger = LoggerFactory.getInstance()
+      .getLogger(ModelArtifactParser.class.getName());
+
+  /**
+   * This method parses the given artifact payload in byte array format and
+   * generates a list of model artifacts according to the content.
+   * 
+   * @param artifactPayload
+   *          artifact content to be parsed
+   * @param artifactName
+   *          name of the artifact
+   * @return a list of model artifacts
+   */
+  public List<Artifact> parse(byte[] artifactPayload, String artifactName) {
+    String payload = new String(artifactPayload);
+    List<Artifact> modelList = new ArrayList<Artifact>();
+
+    try {
+      // Artifact could be JSON or XML
+      if (JsonXmlConverter.isValidJson(payload)) {
+        payload = JsonXmlConverter.convertJsonToXml(payload);
+      }
+
+      DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
+      DocumentBuilder builder = factory.newDocumentBuilder();
+      InputSource is = new InputSource(new StringReader(payload));
+      Document doc = builder.parse(is);
+
+      if ((doc.getDocumentElement().getNodeName().equalsIgnoreCase(MODEL_ELEMENT))
+          || (doc.getDocumentElement().getNodeName().equalsIgnoreCase(NAMED_QUERY_ELEMENT))) {
+        ModelArtifact model = parseModel(doc.getDocumentElement(), payload);
+        if (model != null) {
+          modelList.add(model);
+        } else {
+          // TODO: A WARN message?
+          logger.info(ModelLoaderMsgs.DISTRIBUTION_EVENT,
+              "Unable to parse artifact " + artifactName);
+        }
+      } else if ((doc.getDocumentElement().getNodeName().equalsIgnoreCase(MODELS_ELEMENT))
+          || (doc.getDocumentElement().getNodeName().equalsIgnoreCase(NAMED_QUERIES_ELEMENT))) {
+        // The complete set of models/named-queries were contained in this
+        // artifact
+        NodeList nodeList = doc.getDocumentElement().getChildNodes();
+        for (int i = 0; i < nodeList.getLength(); i++) {
+          Node childNode = nodeList.item(i);
+          if ((childNode.getNodeName().equalsIgnoreCase(MODEL_ELEMENT))
+              || (childNode.getNodeName().equalsIgnoreCase(NAMED_QUERY_ELEMENT))) {
+            String modelPayload = nodeToString(childNode);
+            ModelArtifact model = parseModel(childNode, modelPayload);
+            if (model != null) {
+              modelList.add(model);
+            } else {
+              // TODO: A WARN message?
+              logger.info(ModelLoaderMsgs.DISTRIBUTION_EVENT,
+                  "Unable to parse artifact " + artifactName);
+              modelList.clear();
+              break;
+            }
+          }
+        }
+      }
+    } catch (Exception ex) {
+      // This may not be an error. We may be receiving an artifact that is
+      // unrelated
+      // to models. In this case, we just ignore it.
+      // TODO: A WARN message?
+      logger.info(ModelLoaderMsgs.DISTRIBUTION_EVENT,
+          "Unable to parse artifact " + artifactName + ": " + ex.getLocalizedMessage());
+    }
+
+    return modelList;
+  }
+
+  private ModelArtifact parseModel(Node modelNode, String payload) {
+    ModelArtifact model = new ModelArtifact();
+    model.setPayload(payload);
+
+    if (modelNode.getNodeName().equalsIgnoreCase(MODEL_ELEMENT)) {
+      model.setType(ArtifactType.MODEL);
+    } else {
+      model.setType(ArtifactType.NAMED_QUERY);
+    }
+
+    parseNode(modelNode, model);
+
+    if (model.getNameVersionId() == null) {
+      return null;
+    }
+
+    return model;
+  }
+
+  private void parseNode(Node node, ModelArtifact model) {
+    if (node.getNodeName().equalsIgnoreCase(MODEL_NAME_VERSION_ID)) {
+      model.setNameVersionId(node.getTextContent().trim());
+    } else if (node.getNodeName().equalsIgnoreCase(NAMED_QUERY_VERSION_ID)) {
+      model.setNameVersionId(node.getTextContent().trim());
+    } else if (node.getNodeName().equalsIgnoreCase(RELATIONSHIP_DATA)) {
+      parseRelationshipNode(node, model);
+    } else {
+      NodeList nodeList = node.getChildNodes();
+      for (int i = 0; i < nodeList.getLength(); i++) {
+        Node childNode = nodeList.item(i);
+        parseNode(childNode, model);
+      }
+    }
+  }
+
+  private void parseRelationshipNode(Node node, ModelArtifact model) {
+    String key = null;
+    String value = null;
+
+    NodeList nodeList = node.getChildNodes();
+    for (int i = 0; i < nodeList.getLength(); i++) {
+      Node childNode = nodeList.item(i);
+      if (childNode.getNodeName().equalsIgnoreCase(RELATIONSHIP_KEY)) {
+        key = childNode.getTextContent().trim();
+      } else if (childNode.getNodeName().equalsIgnoreCase(RELATIONSHIP_VALUE)) {
+        value = childNode.getTextContent().trim();
+      }
+    }
+
+    if ((key != null) && (key.equalsIgnoreCase(MODEL_ELEMENT_RELATIONSHIP_KEY))) {
+      if (value != null) {
+        model.addDependentModelId(value);
+      }
+    }
+  }
+
+  private String nodeToString(Node node) throws TransformerException {
+    StringWriter sw = new StringWriter();
+    Transformer transfomer = TransformerFactory.newInstance().newTransformer();
+    transfomer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
+    transfomer.transform(new DOMSource(node), new StreamResult(sw));
+    return sw.toString();
+  }
+}
diff --git a/src/main/java/org/openecomp/modelloader/entity/model/ModelSorter.java b/src/main/java/org/openecomp/modelloader/entity/model/ModelSorter.java
new file mode 100644
index 0000000..4dcda71
--- /dev/null
+++ b/src/main/java/org/openecomp/modelloader/entity/model/ModelSorter.java
@@ -0,0 +1,233 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * MODEL LOADER SERVICE
+ * ================================================================================
+ * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.openecomp.modelloader.entity.model;
+
+import jline.internal.Log;
+
+import org.openecomp.modelloader.entity.Artifact;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.List;
+
+/**
+ * Utility class to sort the given Models according to their dependencies.
+ * Example: Given a list of Models [A, B, C] where B depends on A, and A depends
+ * on C, the sorted result will be [C, A, B]
+ */
+public class ModelSorter {
+
+  /**
+   * Wraps a Model object to form dependencies other Models using Edges.
+   */
+  static class Node {
+    private final ModelArtifact model;
+    private final HashSet<Edge> inEdges;
+    private final HashSet<Edge> outEdges;
+
+    public Node(ModelArtifact model) {
+      this.model = model;
+      inEdges = new HashSet<Edge>();
+      outEdges = new HashSet<Edge>();
+    }
+
+    public Node addEdge(Node node) {
+      Edge edge = new Edge(this, node);
+      outEdges.add(edge);
+      node.inEdges.add(edge);
+      return this;
+    }
+
+    @Override
+    public String toString() {
+      return model.getNameVersionId();
+    }
+
+    @Override
+    public boolean equals(Object other) {
+      ModelArtifact otherModel = ((Node) other).model;
+      return this.model.getNameVersionId().equals(otherModel.getNameVersionId());
+    }
+
+    @Override
+    public int hashCode() {
+      return this.model.getNameVersionId().hashCode();
+
+    }
+  }
+
+  /**
+   * Represents a dependency between two Nodes.
+   */
+  static class Edge {
+    public final Node from;
+    public final Node to;
+
+    public Edge(Node from, Node to) {
+      this.from = from;
+      this.to = to;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+      Edge edge = (Edge) obj;
+      return edge.from == from && edge.to == to;
+    }
+  }
+
+  /**
+   * Returns the list of models sorted by order of dependency.
+   * 
+   * @param originalList
+   *          the list that needs to be sorted
+   * @return a list of sorted models
+   */
+  public List<Artifact> sort(List<Artifact> originalList) {
+
+    if (originalList.size() <= 1) {
+      return originalList;
+    }
+
+    Collection<Node> nodes = createNodes(originalList);
+    Collection<Node> sortedNodes = sortNodes(nodes);
+
+    List<Artifact> sortedModelsList = new ArrayList<Artifact>(sortedNodes.size());
+    for (Node node : sortedNodes) {
+      sortedModelsList.add(node.model);
+    }
+
+    return sortedModelsList;
+  }
+
+  /**
+   * Create nodes from the list of models and their dependencies.
+   * 
+   * @param models
+   *          what the nodes creation is based upon
+   * @return Collection of Node objects
+   */
+  private Collection<Node> createNodes(Collection<Artifact> models) {
+
+    // load list of models into a map, so we can later replace referenceIds with
+    // real Models
+    HashMap<String, ModelArtifact> versionIdToModelMap = new HashMap<String, ModelArtifact>();
+    for (Artifact art : models) {
+      ModelArtifact ma = (ModelArtifact) art;
+      versionIdToModelMap.put(ma.getNameVersionId(), ma);
+    }
+
+    HashMap<String, Node> nodes = new HashMap<String, Node>();
+    // create a node for each model and its referenced models
+    for (Artifact art : models) {
+      ModelArtifact model = (ModelArtifact) art;
+
+      // node might have been created by another model referencing it
+      Node node = nodes.get(model.getNameVersionId());
+
+      if (null == node) {
+        node = new Node(model);
+        nodes.put(model.getNameVersionId(), node);
+      }
+
+      for (String referencedModelId : model.getDependentModelIds()) {
+        // node might have been created by another model referencing it
+        Node referencedNode = nodes.get(referencedModelId);
+
+        if (null == referencedNode) {
+          // create node
+          ModelArtifact referencedModel = versionIdToModelMap.get(referencedModelId);
+          if (referencedModel == null) {
+            Log.debug("ignoring " + referencedModelId);
+            continue; // referenced model not supplied, no need to sort it
+          }
+          referencedNode = new Node(referencedModel);
+          nodes.put(referencedModelId, referencedNode);
+        }
+        referencedNode.addEdge(node);
+      }
+    }
+
+    return nodes.values();
+  }
+
+  /**
+   * Sorts the given Nodes by order of dependency.
+   * 
+   * @param originalList
+   *          the collection of nodes to be sorted
+   * @return a sorted collection of the given nodes
+   */
+  private Collection<Node> sortNodes(Collection<Node> unsortedNodes) {
+
+    // L <- Empty list that will contain the sorted elements
+    ArrayList<Node> nodeList = new ArrayList<Node>();
+
+    // S <- Set of all nodes with no incoming edges
+    HashSet<Node> nodeSet = new HashSet<Node>();
+    for (Node unsortedNode : unsortedNodes) {
+      if (unsortedNode.inEdges.size() == 0) {
+        nodeSet.add(unsortedNode);
+      }
+    }
+
+    // while S is non-empty do
+    while (!nodeSet.isEmpty()) {
+      // remove a node n from S
+      Node node = nodeSet.iterator().next();
+      nodeSet.remove(node);
+
+      // insert n into L
+      nodeList.add(node);
+
+      // for each node m with an edge e from n to m do
+      for (Iterator<Edge> it = node.outEdges.iterator(); it.hasNext();) {
+        // remove edge e from the graph
+        Edge edge = it.next();
+        Node to = edge.to;
+        it.remove();// Remove edge from n
+        to.inEdges.remove(edge);// Remove edge from m
+
+        // if m has no other incoming edges then insert m into S
+        if (to.inEdges.isEmpty()) {
+          nodeSet.add(to);
+        }
+      }
+    }
+    // Check to see if all edges are removed
+    boolean cycle = false;
+    for (Node node : unsortedNodes) {
+      if (!node.inEdges.isEmpty()) {
+        cycle = true;
+        break;
+      }
+    }
+    if (cycle) {
+      throw new RuntimeException(
+          "Circular dependency present between models, topological sort not possible");
+    }
+
+    return nodeList;
+  }
+
+}
diff --git a/src/main/java/org/openecomp/modelloader/notification/DistributionStatusMsg.java b/src/main/java/org/openecomp/modelloader/notification/DistributionStatusMsg.java
new file mode 100644
index 0000000..6079d5d
--- /dev/null
+++ b/src/main/java/org/openecomp/modelloader/notification/DistributionStatusMsg.java
@@ -0,0 +1,75 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * MODEL LOADER SERVICE
+ * ================================================================================
+ * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.openecomp.modelloader.notification;
+
+import org.openecomp.sdc.api.consumer.IDistributionStatusMessage;
+import org.openecomp.sdc.utils.DistributionStatusEnum;
+
+public class DistributionStatusMsg implements IDistributionStatusMessage {
+  private DistributionStatusEnum status;
+  private String distributionId;
+  private String consumerId;
+  private String artifactUrl;
+
+  /**
+   * Creates a new DistributionStatusMsg instance.
+   * 
+   * @param status         - The distribution status to be reported.
+   * @param distributionId - The identifier of the distribution who's status is being rported on.
+   * @param consumerId     - Identifier of the consumer associated with the distribution.
+   * @param artifactUrl    - Resource identifier for the artifact.
+   */
+  public DistributionStatusMsg(DistributionStatusEnum status, 
+                               String distributionId,
+                               String consumerId, 
+                               String artifactUrl) {
+    this.status = status;
+    this.distributionId = distributionId;
+    this.consumerId = consumerId;
+    this.artifactUrl = artifactUrl;
+  }
+
+  @Override
+  public long getTimestamp() {
+    long currentTimeMillis = System.currentTimeMillis();
+    return currentTimeMillis;
+  }
+
+  @Override
+  public DistributionStatusEnum getStatus() {
+    return status;
+  }
+
+  @Override
+  public String getDistributionID() {
+    return distributionId;
+  }
+
+  @Override
+  public String getConsumerID() {
+    return consumerId;
+  }
+  
+  @Override
+  public String getArtifactURL() {
+    return artifactUrl;
+  }
+}
diff --git a/src/main/java/org/openecomp/modelloader/notification/EventCallback.java b/src/main/java/org/openecomp/modelloader/notification/EventCallback.java
new file mode 100644
index 0000000..3b32315
--- /dev/null
+++ b/src/main/java/org/openecomp/modelloader/notification/EventCallback.java
@@ -0,0 +1,286 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * MODEL LOADER SERVICE
+ * ================================================================================
+ * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.openecomp.modelloader.notification;
+
+import org.openecomp.sdc.api.IDistributionClient;
+import org.openecomp.sdc.api.consumer.IDistributionStatusMessage;
+import org.openecomp.sdc.api.consumer.INotificationCallback;
+import org.openecomp.sdc.api.notification.IArtifactInfo;
+import org.openecomp.sdc.api.notification.INotificationData;
+import org.openecomp.sdc.api.notification.IResourceInstance;
+import org.openecomp.sdc.api.results.IDistributionClientDownloadResult;
+import org.openecomp.sdc.api.results.IDistributionClientResult;
+import org.openecomp.sdc.utils.ArtifactTypeEnum;
+import org.openecomp.sdc.utils.DistributionActionResultEnum;
+import org.openecomp.sdc.utils.DistributionStatusEnum;
+
+import org.openecomp.cl.api.Logger;
+import org.openecomp.cl.eelf.LoggerFactory;
+import org.openecomp.cl.mdc.MdcContext;
+import org.openecomp.cl.mdc.MdcOverride;
+import org.openecomp.modelloader.config.ModelLoaderConfig;
+import org.openecomp.modelloader.entity.Artifact;
+import org.openecomp.modelloader.entity.catalog.VnfCatalogArtifact;
+import org.openecomp.modelloader.entity.catalog.VnfCatalogArtifactHandler;
+import org.openecomp.modelloader.entity.model.ModelArtifactHandler;
+import org.openecomp.modelloader.entity.model.ModelArtifactParser;
+import org.openecomp.modelloader.service.ModelLoaderMsgs;
+import org.slf4j.MDC;
+
+import java.text.SimpleDateFormat;
+import java.util.ArrayList;
+import java.util.List;
+
+public class EventCallback implements INotificationCallback {
+
+  private IDistributionClient client;
+  private ModelLoaderConfig config;
+  private static Logger logger = LoggerFactory.getInstance()
+      .getLogger(EventCallback.class.getName());
+  private static Logger auditLogger = LoggerFactory.getInstance()
+      .getAuditLogger(EventCallback.class.getName());
+  private static Logger metricsLogger = LoggerFactory.getInstance()
+      .getMetricsLogger(EventCallback.class.getName());
+
+  private static SimpleDateFormat dateFormatter = new SimpleDateFormat(
+      "yyyy-MM-dd'T'HH:mm:ss.SSSXXX");
+
+  public EventCallback(IDistributionClient client, ModelLoaderConfig config) {
+    this.client = client;
+    this.config = config;
+  }
+
+  @Override
+  public void activateCallback(INotificationData data) {
+    // Init MDC
+    MdcContext.initialize(data.getDistributionID(), "ModelLoader", "", "Event-Bus", "");
+
+    logger.info(ModelLoaderMsgs.DISTRIBUTION_EVENT,
+        "Received distribution " + data.getDistributionID());
+
+    boolean success = true;
+    List<IArtifactInfo> artifacts = getArtifacts(data);
+    List<Artifact> modelArtifacts = new ArrayList<Artifact>();
+    List<Artifact> catalogArtifacts = new ArrayList<Artifact>();
+    ModelArtifactParser modelArtParser = new ModelArtifactParser();
+
+    for (IArtifactInfo artifact : artifacts) {
+      // Grab the current time so we can measure the download time for the
+      // metrics log
+      long startTimeInMs = System.currentTimeMillis();
+      MdcOverride override = new MdcOverride();
+      override.addAttribute(MdcContext.MDC_START_TIME, dateFormatter.format(startTimeInMs));
+
+      // Download Artifact
+      IDistributionClientDownloadResult downloadResult = client.download(artifact);
+
+      // Generate metrics log
+      metricsLogger.info(ModelLoaderMsgs.DOWNLOAD_COMPLETE, null, override,
+          artifact.getArtifactName(), downloadResult.getDistributionActionResult().toString());
+
+      if (downloadResult.getDistributionActionResult() != DistributionActionResultEnum.SUCCESS) {
+        publishDownloadFailure(data, artifact, downloadResult.getDistributionMessageResult());
+        success = false;
+        break;
+      }
+
+      logger.debug("Artifact: " + artifact.getArtifactName() + "  Payload:\n" + new String(downloadResult.getArtifactPayload()));
+      
+      publishDownloadSuccess(data, artifact, downloadResult);
+
+      if ((artifact.getArtifactType()
+          .compareToIgnoreCase(ArtifactTypeEnum.MODEL_INVENTORY_PROFILE.toString()) == 0)
+          || (artifact.getArtifactType()
+              .compareToIgnoreCase(ArtifactTypeEnum.MODEL_QUERY_SPEC.toString()) == 0)) {
+        modelArtifacts.addAll(modelArtParser.parse(downloadResult.getArtifactPayload(),
+            downloadResult.getArtifactName()));
+      } else if (artifact.getArtifactType()
+          .compareToIgnoreCase(ArtifactTypeEnum.VNF_CATALOG.toString()) == 0) {
+        catalogArtifacts
+            .add(new VnfCatalogArtifact(new String(downloadResult.getArtifactPayload())));
+      }
+    }
+
+    String statusString = "SUCCESS";
+    if (success) {
+      ModelArtifactHandler modelHandler = new ModelArtifactHandler(config);
+      boolean modelDeploySuccess = modelHandler.pushArtifacts(modelArtifacts,
+          data.getDistributionID());
+
+      VnfCatalogArtifactHandler catalogHandler = new VnfCatalogArtifactHandler(config);
+      boolean catalogDeploySuccess = catalogHandler.pushArtifacts(catalogArtifacts,
+          data.getDistributionID());
+
+      for (IArtifactInfo artifact : artifacts) {
+        if ((artifact.getArtifactType()
+            .compareToIgnoreCase(ArtifactTypeEnum.MODEL_INVENTORY_PROFILE.toString()) == 0)
+            || (artifact.getArtifactType()
+                .compareToIgnoreCase(ArtifactTypeEnum.MODEL_QUERY_SPEC.toString()) == 0)) {
+          if (modelDeploySuccess) {
+            publishDeploySuccess(data, artifact);
+          } else {
+            publishDeployFailure(data, artifact);
+            statusString = "FAILURE";
+          }
+        } else if (artifact.getArtifactType()
+            .compareToIgnoreCase(ArtifactTypeEnum.VNF_CATALOG.toString()) == 0) {
+          if (catalogDeploySuccess) {
+            publishDeploySuccess(data, artifact);
+          } else {
+            publishDeployFailure(data, artifact);
+            statusString = "FAILURE";
+          }
+        }
+      }
+    }
+
+    auditLogger.info(ModelLoaderMsgs.DISTRIBUTION_EVENT,
+        "Processed distribution " + data.getDistributionID() + "  (" + statusString + ")");
+    MDC.clear();
+  }
+
+  private List<IArtifactInfo> getArtifacts(INotificationData data) {
+    List<IArtifactInfo> artifacts = new ArrayList<IArtifactInfo>();
+    List<IResourceInstance> resources = data.getResources();
+
+    if (data.getServiceArtifacts() != null) {
+      artifacts.addAll(data.getServiceArtifacts());
+    }
+
+    if (resources != null) {
+      for (IResourceInstance resource : resources) {
+        if (resource.getArtifacts() != null) {
+          artifacts.addAll(resource.getArtifacts());
+        }
+      }
+    }
+
+    return artifacts;
+  }
+
+  private void publishDownloadFailure(INotificationData data, IArtifactInfo artifact,
+      String errorMessage) {
+    // Grab the current time so we can measure the download time for the metrics
+    // log
+    long startTimeInMs = System.currentTimeMillis();
+    MdcOverride override = new MdcOverride();
+    override.addAttribute(MdcContext.MDC_START_TIME, dateFormatter.format(startTimeInMs));
+
+    IDistributionClientResult sendDownloadStatus = client.sendDownloadStatus(
+        buildStatusMessage(client, data, artifact, DistributionStatusEnum.DOWNLOAD_ERROR));
+    metricsLogger.info(ModelLoaderMsgs.EVENT_PUBLISHED, null, override, "download failure",
+        artifact.getArtifactName(), sendDownloadStatus.getDistributionActionResult().toString());
+
+    if (sendDownloadStatus.getDistributionActionResult() != DistributionActionResultEnum.SUCCESS) {
+      logger.error(ModelLoaderMsgs.DISTRIBUTION_EVENT_ERROR,
+          "Failed to publish download failure status: "
+              + sendDownloadStatus.getDistributionMessageResult());
+    }
+
+    logger.error(ModelLoaderMsgs.DISTRIBUTION_EVENT_ERROR,
+        "Failed to download artifact " + artifact.getArtifactName() + ": " + errorMessage);
+  }
+
+  private void publishDownloadSuccess(INotificationData data, IArtifactInfo artifact,
+      IDistributionClientDownloadResult downloadResult) {
+    // Grab the current time so we can measure the download time for the metrics
+    // log
+    long startTimeInMs = System.currentTimeMillis();
+    MdcOverride override = new MdcOverride();
+    override.addAttribute(MdcContext.MDC_START_TIME, dateFormatter.format(startTimeInMs));
+
+    IDistributionClientResult sendDownloadStatus = client.sendDownloadStatus(
+        buildStatusMessage(client, data, artifact, DistributionStatusEnum.DOWNLOAD_OK));
+    metricsLogger.info(ModelLoaderMsgs.EVENT_PUBLISHED, null, override, "download success",
+        artifact.getArtifactName(), sendDownloadStatus.getDistributionActionResult().toString());
+
+    logger.info(ModelLoaderMsgs.DISTRIBUTION_EVENT,
+        "Downloaded artifact: " + artifact.getArtifactName());
+
+    if (sendDownloadStatus.getDistributionActionResult() != DistributionActionResultEnum.SUCCESS) {
+      logger.error(ModelLoaderMsgs.DISTRIBUTION_EVENT_ERROR,
+          "Failed to publish download success status: "
+              + sendDownloadStatus.getDistributionMessageResult());
+    }
+
+    if (logger.isDebugEnabled()) {
+      StringBuilder sb = new StringBuilder();
+      sb.append("Downloaded artifact:\n");
+      sb.append("ArtInfo_Art_Name: " + artifact.getArtifactName());
+      sb.append("\nArtInfo_Art_description: " + artifact.getArtifactDescription());
+      sb.append("\nArtInfo_Art_CheckSum: " + artifact.getArtifactChecksum());
+      sb.append("\nArtInfo_Art_Url: " + artifact.getArtifactURL());
+      sb.append("\nArtInfo_Art_Type: " + artifact.getArtifactType());
+      sb.append("\nArtInfo_Serv_description: " + data.getServiceDescription());
+      sb.append("\nArtInfo_Serv_Name: " + data.getServiceName());
+      sb.append("\nGet_serviceVersion: " + data.getServiceVersion());
+      sb.append("\nGet_Service_UUID: " + data.getServiceUUID());
+      sb.append("\nArtInfo_DistributionId: " + data.getDistributionID());
+      logger.debug(sb.toString());
+    }
+  }
+
+  private void publishDeployFailure(INotificationData data, IArtifactInfo artifact) {
+    // Grab the current time so we can measure the download time for the metrics
+    // log
+    long startTimeInMs = System.currentTimeMillis();
+    MdcOverride override = new MdcOverride();
+    override.addAttribute(MdcContext.MDC_START_TIME, dateFormatter.format(startTimeInMs));
+
+    IDistributionClientResult sendStatus = client.sendDeploymentStatus(
+        buildStatusMessage(client, data, artifact, DistributionStatusEnum.DEPLOY_ERROR));
+    metricsLogger.info(ModelLoaderMsgs.EVENT_PUBLISHED, null, override, "deploy failure",
+        artifact.getArtifactName(), sendStatus.getDistributionActionResult().toString());
+
+    if (sendStatus.getDistributionActionResult() != DistributionActionResultEnum.SUCCESS) {
+      logger.error(ModelLoaderMsgs.DISTRIBUTION_EVENT_ERROR,
+          "Failed to publish deploy failure status: " + sendStatus.getDistributionMessageResult());
+    }
+  }
+
+  private void publishDeploySuccess(INotificationData data, IArtifactInfo artifact) {
+    // Grab the current time so we can measure the download time for the metrics
+    // log
+    long startTimeInMs = System.currentTimeMillis();
+    MdcOverride override = new MdcOverride();
+    override.addAttribute(MdcContext.MDC_START_TIME, dateFormatter.format(startTimeInMs));
+
+    IDistributionClientResult sendStatus = client.sendDownloadStatus(
+        buildStatusMessage(client, data, artifact, DistributionStatusEnum.DEPLOY_OK));
+    metricsLogger.info(ModelLoaderMsgs.EVENT_PUBLISHED, null, override, "deploy success",
+        artifact.getArtifactName(), sendStatus.getDistributionActionResult().toString());
+
+    if (sendStatus.getDistributionActionResult() != DistributionActionResultEnum.SUCCESS) {
+      logger.error(ModelLoaderMsgs.DISTRIBUTION_EVENT_ERROR,
+          "Failed to publish deploy success status: " + sendStatus.getDistributionMessageResult());
+    }
+  }
+
+  private IDistributionStatusMessage buildStatusMessage(IDistributionClient client,
+      INotificationData data, IArtifactInfo artifact, DistributionStatusEnum status) {
+    IDistributionStatusMessage statusMessage = new DistributionStatusMsg(status,
+        data.getDistributionID(), client.getConfiguration().getConsumerID(),
+        artifact.getArtifactURL());
+
+    return statusMessage;
+  }
+
+}
diff --git a/src/main/java/org/openecomp/modelloader/restclient/AaiRestClient.java b/src/main/java/org/openecomp/modelloader/restclient/AaiRestClient.java
new file mode 100644
index 0000000..e13bdbd
--- /dev/null
+++ b/src/main/java/org/openecomp/modelloader/restclient/AaiRestClient.java
@@ -0,0 +1,400 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * MODEL LOADER SERVICE
+ * ================================================================================
+ * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.openecomp.modelloader.restclient;
+
+import com.sun.jersey.api.client.Client;
+import com.sun.jersey.api.client.ClientResponse;
+import com.sun.jersey.api.client.config.ClientConfig;
+import com.sun.jersey.api.client.config.DefaultClientConfig;
+import com.sun.jersey.api.client.filter.LoggingFilter;
+import com.sun.jersey.client.urlconnection.HTTPSProperties;
+import org.openecomp.cl.api.LogFields;
+import org.openecomp.cl.api.LogLine;
+import org.openecomp.cl.api.Logger;
+import org.openecomp.cl.eelf.LoggerFactory;
+import org.openecomp.cl.mdc.MdcContext;
+import org.openecomp.cl.mdc.MdcOverride;
+import org.openecomp.modelloader.config.ModelLoaderConfig;
+import org.openecomp.modelloader.service.ModelLoaderMsgs;
+import org.w3c.dom.Document;
+import org.w3c.dom.Node;
+import org.w3c.dom.NodeList;
+import org.xml.sax.InputSource;
+import org.xml.sax.SAXException;
+
+import java.io.ByteArrayOutputStream;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.PrintStream;
+import java.io.StringReader;
+import java.security.GeneralSecurityException;
+import java.security.KeyStore;
+import java.security.cert.X509Certificate;
+import java.text.SimpleDateFormat;
+
+import javax.net.ssl.HostnameVerifier;
+import javax.net.ssl.HttpsURLConnection;
+import javax.net.ssl.KeyManagerFactory;
+import javax.net.ssl.SSLContext;
+import javax.net.ssl.SSLSession;
+import javax.net.ssl.TrustManager;
+import javax.net.ssl.X509TrustManager;
+import javax.ws.rs.core.Response;
+import javax.xml.parsers.DocumentBuilder;
+import javax.xml.parsers.DocumentBuilderFactory;
+import javax.xml.parsers.ParserConfigurationException;
+
+public class AaiRestClient {
+  public enum MimeType {
+    XML("application/xml"), JSON("application/json");
+
+    private String httpType;
+
+    MimeType(String httpType) {
+      this.httpType = httpType;
+    }
+
+    String getHttpHeaderType() {
+      return httpType;
+    }
+  }
+
+  private static String HEADER_TRANS_ID = "X-TransactionId";
+  private static String HEADER_FROM_APP_ID = "X-FromAppId";
+  private static String HEADER_AUTHORIZATION = "Authorization";
+  private static String ML_APP_NAME = "ModelLoader";
+  private static String RESOURCE_VERSION_PARAM = "resource-version";
+
+  private static SimpleDateFormat dateFormatter = new SimpleDateFormat(
+      "yyyy-MM-dd'T'HH:mm:ss.SSSXXX");
+
+  private static Logger logger = LoggerFactory.getInstance()
+      .getLogger(AaiRestClient.class.getName());
+  private static Logger metricsLogger = LoggerFactory.getInstance()
+      .getMetricsLogger(AaiRestClient.class.getName());
+
+  private ModelLoaderConfig config = null;
+
+  public AaiRestClient(ModelLoaderConfig config) {
+    this.config = config;
+  }
+
+  /**
+   * Send a PUT request to the A&AI.
+   *
+   * @param url
+   *          - the url
+   * @param transId
+   *          - transaction ID
+   * @param payload
+   *          - the XML or JSON payload for the request
+   * @param mimeType
+   *          - the content type (XML or JSON)
+   * @return ClientResponse
+   */
+  public ClientResponse putResource(String url, String payload, String transId, MimeType mimeType) {
+    ClientResponse result = null;
+    ByteArrayOutputStream baos = new ByteArrayOutputStream();
+    long startTimeInMs = 0;
+    MdcOverride override = new MdcOverride();
+
+    try {
+      Client client = setupClient();
+
+      baos = new ByteArrayOutputStream();
+      PrintStream ps = new PrintStream(baos);
+      if (logger.isDebugEnabled()) {
+        client.addFilter(new LoggingFilter(ps));
+      }
+
+      // Grab the current time so that we can use it for metrics purposes later.
+      startTimeInMs = System.currentTimeMillis();
+      override.addAttribute(MdcContext.MDC_START_TIME, dateFormatter.format(startTimeInMs));
+
+      if (useBasicAuth()) {
+        result = client.resource(url).header(HEADER_TRANS_ID, transId)
+            .header(HEADER_FROM_APP_ID, ML_APP_NAME)
+            .header(HEADER_AUTHORIZATION, getAuthenticationCredentials())
+            .type(mimeType.getHttpHeaderType()).put(ClientResponse.class, payload);
+      } else {
+        result = client.resource(url).header(HEADER_TRANS_ID, transId)
+            .header(HEADER_FROM_APP_ID, ML_APP_NAME).type(mimeType.getHttpHeaderType())
+            .put(ClientResponse.class, payload);
+      }
+    } catch (Exception ex) {
+      logger.error(ModelLoaderMsgs.AAI_REST_REQUEST_ERROR, "PUT", url, ex.getLocalizedMessage());
+      return null;
+    } finally {
+      if (logger.isDebugEnabled()) {
+        logger.debug(baos.toString());
+      }
+    }
+
+    if ((result != null) && ((result.getStatus() == Response.Status.CREATED.getStatusCode())
+        || (result.getStatus() == Response.Status.OK.getStatusCode()))) {
+      logger.info(ModelLoaderMsgs.AAI_REST_REQUEST_SUCCESS, "PUT", url,
+          Integer.toString(result.getStatus()));
+      metricsLogger.info(ModelLoaderMsgs.AAI_REST_REQUEST_SUCCESS,
+          new LogFields().setField(LogLine.DefinedFields.RESPONSE_CODE, result.getStatus())
+              .setField(LogLine.DefinedFields.RESPONSE_DESCRIPTION,
+                  result.getResponseStatus().toString()),
+          override, "PUT", url, Integer.toString(result.getStatus()));
+    } else {
+      // If response is not 200 OK, then additionally log the reason
+      String respMsg = result.getEntity(String.class);
+      if (respMsg == null) {
+        respMsg = result.getStatusInfo().getReasonPhrase();
+      }
+      logger.info(ModelLoaderMsgs.AAI_REST_REQUEST_UNSUCCESSFUL, "PUT", url,
+          Integer.toString(result.getStatus()), respMsg);
+      metricsLogger.info(ModelLoaderMsgs.AAI_REST_REQUEST_UNSUCCESSFUL,
+          new LogFields().setField(LogLine.DefinedFields.RESPONSE_CODE, result.getStatus())
+              .setField(LogLine.DefinedFields.RESPONSE_DESCRIPTION,
+                  result.getResponseStatus().toString()),
+          override, "PUT", url, Integer.toString(result.getStatus()), respMsg);
+    }
+
+    return result;
+  }
+
+  /**
+   * Send a DELETE request to the A&AI.
+   *
+   * @param url
+   *          - the url
+   * @param resourceVersion
+   *          - the resource-version of the model to delete
+   * @param transId
+   *          - transaction ID
+   * @return ClientResponse
+   */
+  public ClientResponse deleteResource(String url, String resourceVersion, String transId) {
+    ClientResponse result = null;
+    ByteArrayOutputStream baos = new ByteArrayOutputStream();
+    long startTimeInMs = 0;
+    MdcOverride override = new MdcOverride();
+
+    try {
+      Client client = setupClient();
+
+      baos = new ByteArrayOutputStream();
+      PrintStream ps = new PrintStream(baos);
+      if (logger.isDebugEnabled()) {
+        client.addFilter(new LoggingFilter(ps));
+      }
+
+      // Grab the current time so that we can use it for metrics purposes later.
+      startTimeInMs = System.currentTimeMillis();
+      override.addAttribute(MdcContext.MDC_START_TIME, dateFormatter.format(startTimeInMs));
+
+      if (useBasicAuth()) {
+        result = client.resource(url).queryParam(RESOURCE_VERSION_PARAM, resourceVersion)
+            .header(HEADER_TRANS_ID, transId).header(HEADER_FROM_APP_ID, ML_APP_NAME)
+            .header(HEADER_AUTHORIZATION, getAuthenticationCredentials())
+            .delete(ClientResponse.class);
+      } else {
+        result = client.resource(url).queryParam(RESOURCE_VERSION_PARAM, resourceVersion)
+            .header(HEADER_TRANS_ID, transId).header(HEADER_FROM_APP_ID, ML_APP_NAME)
+            .delete(ClientResponse.class);
+      }
+    } catch (Exception ex) {
+      logger.error(ModelLoaderMsgs.AAI_REST_REQUEST_ERROR, "DELETE", url, ex.getLocalizedMessage());
+      return null;
+    } finally {
+      if (logger.isDebugEnabled()) {
+        logger.debug(baos.toString());
+      }
+    }
+
+    logger.info(ModelLoaderMsgs.AAI_REST_REQUEST_SUCCESS, "DELETE", url,
+        Integer.toString(result.getStatus()));
+    metricsLogger.info(ModelLoaderMsgs.AAI_REST_REQUEST_SUCCESS,
+        new LogFields().setField(LogLine.DefinedFields.RESPONSE_CODE, result.getStatus()).setField(
+            LogLine.DefinedFields.RESPONSE_DESCRIPTION, result.getResponseStatus().toString()),
+        override, "DELETE", url, Integer.toString(result.getStatus()));
+
+    return result;
+  }
+
+  /**
+   * Send a GET request to the A&AI for a resource.
+   *
+   * @param url
+   *          - the url to use
+   * @param transId
+   *          - transaction ID
+   * @return ClientResponse
+   */
+  public ClientResponse getResource(String url, String transId, MimeType mimeType) {
+    ClientResponse result = null;
+    ByteArrayOutputStream baos = new ByteArrayOutputStream();
+    long startTimeInMs = 0;
+    MdcOverride override = new MdcOverride();
+
+    try {
+      Client client = setupClient();
+
+      baos = new ByteArrayOutputStream();
+      PrintStream ps = new PrintStream(baos);
+      if (logger.isDebugEnabled()) {
+        client.addFilter(new LoggingFilter(ps));
+      }
+
+      // Grab the current time so that we can use it for metrics purposes later.
+      startTimeInMs = System.currentTimeMillis();
+      override.addAttribute(MdcContext.MDC_START_TIME, dateFormatter.format(startTimeInMs));
+
+      if (useBasicAuth()) {
+        result = client.resource(url).header(HEADER_TRANS_ID, transId)
+            .header(HEADER_FROM_APP_ID, ML_APP_NAME).accept(mimeType.getHttpHeaderType())
+            .header(HEADER_AUTHORIZATION, getAuthenticationCredentials()).get(ClientResponse.class);
+      } else {
+        result = client.resource(url).header(HEADER_TRANS_ID, transId)
+            .header(HEADER_FROM_APP_ID, ML_APP_NAME).accept(mimeType.getHttpHeaderType())
+            .get(ClientResponse.class);
+
+      }
+    } catch (Exception ex) {
+      logger.error(ModelLoaderMsgs.AAI_REST_REQUEST_ERROR, "GET", url, ex.getLocalizedMessage());
+      return null;
+    } finally {
+      if (logger.isDebugEnabled()) {
+        logger.debug(baos.toString());
+      }
+    }
+
+    logger.info(ModelLoaderMsgs.AAI_REST_REQUEST_SUCCESS, "GET", url,
+        Integer.toString(result.getStatus()));
+    metricsLogger.info(ModelLoaderMsgs.AAI_REST_REQUEST_SUCCESS,
+        new LogFields().setField(LogLine.DefinedFields.RESPONSE_CODE, result.getStatus()).setField(
+            LogLine.DefinedFields.RESPONSE_DESCRIPTION, result.getResponseStatus().toString()),
+        override, "GET", url, Integer.toString(result.getStatus()));
+
+    return result;
+  }
+
+  /**
+   * Does a GET on a resource to retrieve the resource version, and then DELETE
+   * that version.
+   *
+   * @param url
+   *          - the url
+   * @param transId
+   *          - transaction ID
+   * @return ClientResponse
+   */
+  public ClientResponse getAndDeleteResource(String url, String transId) {
+    // First, GET the model
+    ClientResponse getResponse = getResource(url, transId, MimeType.XML);
+    if ((getResponse == null) || (getResponse.getStatus() != Response.Status.OK.getStatusCode())) {
+      return getResponse;
+    }
+
+    // Delete the model using the resource version in the response
+    String resVersion = null;
+    try {
+      resVersion = getResourceVersion(getResponse);
+    } catch (Exception e) {
+      logger.error(ModelLoaderMsgs.AAI_REST_REQUEST_ERROR, "GET", url, e.getLocalizedMessage());
+      return null;
+    }
+
+    return deleteResource(url, resVersion, transId);
+  }
+
+  private Client setupClient() throws IOException, GeneralSecurityException {
+    ClientConfig clientConfig = new DefaultClientConfig();
+
+    HttpsURLConnection.setDefaultHostnameVerifier(new HostnameVerifier() {
+      @Override
+      public boolean verify(String string, SSLSession ssls) {
+        return true;
+      }
+    });
+
+    // Create a trust manager that does not validate certificate chains
+    TrustManager[] trustAllCerts = new TrustManager[] { new X509TrustManager() {
+      @Override
+      public X509Certificate[] getAcceptedIssuers() {
+        return null;
+      }
+
+      @Override
+      public void checkClientTrusted(X509Certificate[] certs, String authType) {}
+
+      @Override
+      public void checkServerTrusted(X509Certificate[] certs, String authType) {}
+    } };
+
+    SSLContext ctx = SSLContext.getInstance("TLS");
+    KeyManagerFactory kmf = KeyManagerFactory.getInstance("SunX509");
+    FileInputStream fin = new FileInputStream(config.getAaiKeyStorePath());
+    KeyStore ks = KeyStore.getInstance("PKCS12");
+    char[] pwd = config.getAaiKeyStorePassword().toCharArray();
+    ks.load(fin, pwd);
+    kmf.init(ks, pwd);
+
+    ctx.init(kmf.getKeyManagers(), trustAllCerts, null);
+    clientConfig.getProperties().put(HTTPSProperties.PROPERTY_HTTPS_PROPERTIES,
+        new HTTPSProperties(new HostnameVerifier() {
+          @Override
+          public boolean verify(String theString, SSLSession sslSession) {
+            return true;
+          }
+        }, ctx));
+
+    Client client = Client.create(clientConfig);
+
+    return client;
+  }
+
+  private String getResourceVersion(ClientResponse response)
+      throws ParserConfigurationException, SAXException, IOException {
+    String respData = response.getEntity(String.class);
+
+    DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
+    DocumentBuilder builder = factory.newDocumentBuilder();
+    InputSource is = new InputSource(new StringReader(respData));
+    Document doc = builder.parse(is);
+
+    NodeList nodeList = doc.getDocumentElement().getChildNodes();
+    for (int i = 0; i < nodeList.getLength(); i++) {
+      Node currentNode = nodeList.item(i);
+      if (currentNode.getNodeName().equals(RESOURCE_VERSION_PARAM)) {
+        return currentNode.getTextContent();
+      }
+    }
+
+    return null;
+  }
+
+  private String getAuthenticationCredentials() {
+
+    String usernameAndPassword = config.getAaiAuthenticationUser() + ":"
+        + config.getAaiAuthenticationPassword();
+    return "Basic " + java.util.Base64.getEncoder().encodeToString(usernameAndPassword.getBytes());
+  }
+
+  public boolean useBasicAuth() {
+    return (config.getAaiAuthenticationUser() != null)
+        && (config.getAaiAuthenticationPassword() != null);
+  }
+}
diff --git a/src/main/java/org/openecomp/modelloader/service/ModelLoaderInterface.java b/src/main/java/org/openecomp/modelloader/service/ModelLoaderInterface.java
new file mode 100644
index 0000000..689115e
--- /dev/null
+++ b/src/main/java/org/openecomp/modelloader/service/ModelLoaderInterface.java
@@ -0,0 +1,53 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * MODEL LOADER SERVICE
+ * ================================================================================
+ * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.openecomp.modelloader.service;
+
+import java.io.IOException;
+
+import javax.servlet.http.HttpServletRequest;
+import javax.ws.rs.Consumes;
+import javax.ws.rs.GET;
+import javax.ws.rs.POST;
+import javax.ws.rs.PUT;
+import javax.ws.rs.Path;
+import javax.ws.rs.PathParam;
+import javax.ws.rs.Produces;
+import javax.ws.rs.core.Context;
+import javax.ws.rs.core.Response;
+
+public interface ModelLoaderInterface {
+
+  @GET
+  @Path("/loadModel/{modelid}")
+  public Response loadModel(@PathParam("modelid") String modelid);
+
+  @PUT
+  @Path("/saveModel/{modelid}/{modelname}")
+  public Response saveModel(@PathParam("modelid") String modelid,
+      @PathParam("modelname") String modelname);
+
+  @POST
+  @Consumes("application/xml")
+  @Produces("application/xml")
+  @Path("/ingestModel/{modelid}")
+  public Response ingestModel(@PathParam("modelid") String modelid, @Context HttpServletRequest req,
+      String payload) throws IOException;
+}
diff --git a/src/main/java/org/openecomp/modelloader/service/ModelLoaderMsgs.java b/src/main/java/org/openecomp/modelloader/service/ModelLoaderMsgs.java
new file mode 100644
index 0000000..b81c541
--- /dev/null
+++ b/src/main/java/org/openecomp/modelloader/service/ModelLoaderMsgs.java
@@ -0,0 +1,102 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * MODEL LOADER SERVICE
+ * ================================================================================
+ * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.openecomp.modelloader.service;
+
+import com.att.eelf.i18n.EELFResourceManager;
+
+import org.openecomp.cl.eelf.LogMessageEnum;
+
+public enum ModelLoaderMsgs implements LogMessageEnum {
+
+  /**
+   * Arguments: None.
+   */
+  LOADING_CONFIGURATION,
+
+  /**
+   * Arguments: None.
+   */
+  STOPPING_CLIENT,
+
+  /**
+   * Arguments: {0} = message.
+   */
+  INITIALIZING,
+
+  /**
+   * Arguments: {0} = reason.
+   */
+  ASDC_CONNECTION_ERROR,
+
+  /**
+   * Arguments: {0} = message.
+   */
+  DISTRIBUTION_EVENT,
+
+  /**
+   * Arguments: {0} = error message.
+   */
+  DISTRIBUTION_EVENT_ERROR, 
+  
+  /**
+    * Arguments: {0} = request type.
+    *            {1} = endpoint. 
+    *            {2} = result code.
+    */
+  AAI_REST_REQUEST_SUCCESS,
+
+  /**
+   * Arguments: {0} = request type. 
+   *            {1} = endpoint. 
+   *            {2} = result code. 
+   *            {3} = result.
+   * message
+   */
+  AAI_REST_REQUEST_UNSUCCESSFUL,
+
+  /**
+   * Arguments: {0} = request type. 
+   *            {1} = endpoint.
+   *            {2} = error message.
+   */
+  AAI_REST_REQUEST_ERROR,
+
+  /**
+   * Arguments: {0} = artifact name. 
+   *            {1} = result.
+   */
+  DOWNLOAD_COMPLETE,
+
+  /**
+   * Arguments: {0} = event. 
+   *            {1} = artifact name. 
+   *            {2} = result.
+   */
+  EVENT_PUBLISHED;
+
+  /**
+   * Load message bundle (ModelLoaderMsgs.properties file)
+   */
+  static {
+    EELFResourceManager.loadMessageBundle("org/openecomp/modelloader/service/ModelLoaderMsgs");
+  }
+
+}
diff --git a/src/main/java/org/openecomp/modelloader/service/ModelLoaderService.java b/src/main/java/org/openecomp/modelloader/service/ModelLoaderService.java
new file mode 100644
index 0000000..16aba7e
--- /dev/null
+++ b/src/main/java/org/openecomp/modelloader/service/ModelLoaderService.java
@@ -0,0 +1,174 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * MODEL LOADER SERVICE
+ * ================================================================================
+ * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.openecomp.modelloader.service;
+
+import org.openecomp.sdc.api.IDistributionClient;
+import org.openecomp.sdc.api.results.IDistributionClientResult;
+import org.openecomp.sdc.impl.DistributionClientFactory;
+import org.openecomp.sdc.utils.DistributionActionResultEnum;
+
+import org.openecomp.cl.api.Logger;
+import org.openecomp.cl.eelf.LoggerFactory;
+import org.openecomp.modelloader.config.ModelLoaderConfig;
+import org.openecomp.modelloader.entity.model.ModelArtifactHandler;
+import org.openecomp.modelloader.notification.EventCallback;
+
+import java.io.IOException;
+import java.util.Properties;
+
+import javax.annotation.PostConstruct;
+import javax.annotation.PreDestroy;
+import javax.servlet.http.HttpServletRequest;
+import javax.ws.rs.core.Response;
+
+/**
+ * Service class in charge of managing the negotiating model loading
+ * capabilities between AAI and an ASDC.
+ */
+public class ModelLoaderService implements ModelLoaderInterface {
+
+  protected static String CONFIG_FILE = "model-loader.properties";
+
+  private IDistributionClient client;
+  private ModelLoaderConfig config;
+
+  static Logger logger = LoggerFactory.getInstance().getLogger(ModelLoaderService.class.getName());
+
+  /**
+   * Responsible for loading configuration files and calling initialization.
+   */
+  @PostConstruct
+  protected void start() {
+    // Load model loader system configuration
+    logger.info(ModelLoaderMsgs.LOADING_CONFIGURATION);
+    Properties configProperties = new Properties();
+    try {
+      configProperties.load(this.getClass().getClassLoader().getResourceAsStream(CONFIG_FILE));
+    } catch (IOException e) {
+      String errorMsg = "Failed to load configuration: " + e.getMessage();
+      logger.error(ModelLoaderMsgs.ASDC_CONNECTION_ERROR, errorMsg);
+      shutdown();
+    }
+    
+    config = new ModelLoaderConfig(configProperties);
+    init();
+  }
+
+  /**
+   * Responsible for stopping the connection to the distribution client before
+   * the resource is destroyed.
+   */
+  @PreDestroy
+  protected void preShutdownOperations() {
+    logger.info(ModelLoaderMsgs.STOPPING_CLIENT);
+    if (client != null) {
+      client.stop();
+    }
+  }
+
+  /**
+   * Responsible for loading configuration files, initializing model
+   * distribution clients, and starting them.
+   */
+  protected void init() {
+    // Initialize distribution client
+    logger.debug(ModelLoaderMsgs.INITIALIZING, "Initializing distribution client...");
+    client = DistributionClientFactory.createDistributionClient();
+    IDistributionClientResult initResult = client.init(config, new EventCallback(client, config));
+    if (initResult.getDistributionActionResult() != DistributionActionResultEnum.SUCCESS) {
+      String errorMsg = "Failed to initialize distribution client: "
+          + initResult.getDistributionMessageResult();
+      logger.error(ModelLoaderMsgs.ASDC_CONNECTION_ERROR, errorMsg);
+      shutdown();
+    }
+
+    // Start distribution client
+    logger.debug(ModelLoaderMsgs.INITIALIZING, "Starting distribution client...");
+    IDistributionClientResult startResult = client.start();
+    if (startResult.getDistributionActionResult() != DistributionActionResultEnum.SUCCESS) {
+      String errorMsg = "Failed to start distribution client: "
+          + startResult.getDistributionMessageResult();
+      logger.error(ModelLoaderMsgs.ASDC_CONNECTION_ERROR, errorMsg);
+      shutdown();
+    }
+
+    logger.debug(ModelLoaderMsgs.INITIALIZING,
+        "Succcessfully loaded service: " + this.getClass().getSimpleName());
+  }
+
+  /**
+   * Shut down the process.
+   */
+  private void shutdown() {
+    preShutdownOperations();
+
+    // TODO: Find a better way to shut down the model loader.
+    try {
+      // Give logs time to write to file
+      Thread.sleep(2000);
+    } catch (InterruptedException e) {
+      // Nothing we can do at this point
+    }
+
+    Runtime.getRuntime().halt(1);
+  }
+
+  /** (non-Javadoc)
+   * @see org.openecomp.modelloader.service.ModelLoaderInterface#loadModel(java.lang.String)
+   */
+  @Override
+  public Response loadModel(String modelid) {
+    Response response = Response.ok("{\"model_loaded\":\"" + modelid + "\"}").build();
+
+    return response;
+  }
+
+  /** (non-Javadoc)
+   * @see org.openecomp.modelloader.service.ModelLoaderInterface#saveModel(java.lang.String, java.lang.String)
+   */
+  @Override
+  public Response saveModel(String modelid, String modelname) {
+    Response response = Response.ok("{\"model_saved\":\"" + modelid + "-" + modelname + "\"}")
+        .build();
+
+    return response;
+  }
+
+  @Override
+  public Response ingestModel(String modelid, HttpServletRequest req, String payload)
+      throws IOException {
+    Response response;
+
+    if (config.getIngestSimulatorEnabled()) {
+      logger.info(ModelLoaderMsgs.DISTRIBUTION_EVENT, "Received test artifact");
+
+      ModelArtifactHandler handler = new ModelArtifactHandler(config);
+      handler.loadModelTest(payload.getBytes());
+
+      response = Response.ok().build();
+    } else {
+      logger.debug("Simulation interface disabled");
+      response = Response.serverError().build();
+    }
+
+    return response;
+  }
+}
diff --git a/src/main/java/org/openecomp/modelloader/util/JsonXmlConverter.java b/src/main/java/org/openecomp/modelloader/util/JsonXmlConverter.java
new file mode 100644
index 0000000..ca63b23
--- /dev/null
+++ b/src/main/java/org/openecomp/modelloader/util/JsonXmlConverter.java
@@ -0,0 +1,79 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * MODEL LOADER SERVICE
+ * ================================================================================
+ * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.openecomp.modelloader.util;
+
+import org.json.JSONArray;
+import org.json.JSONException;
+import org.json.JSONObject;
+import org.json.XML;
+
+public class JsonXmlConverter {
+
+  /**
+   * Determines whether or not the supplied text string represents a valid
+   * JSON structure or not.
+   * 
+   * @param text - The text to be evaluated.
+   * 
+   * @return - true if the string represents a valid JSON object,
+   *           false, otherwise.
+   */
+  public static boolean isValidJson(String text) {
+    try {
+      new JSONObject(text);
+    } catch (JSONException ex) {
+      try {
+        new JSONArray(text);
+      } catch (JSONException ex1) {
+        return false;
+      }
+    }
+
+    return true;
+  }
+
+  /**
+   * Takes a text string representing a valid JSON structure and converts it to
+   * an equivalent XML string.
+   * 
+   * @param jsonText - The JSON string to convert to XML.
+   * 
+   * @return - An XML string representation of the supplied JSON string.
+   */
+  public static String convertJsonToXml(String jsonText) {
+    JSONObject jsonObj = new JSONObject(jsonText);
+    String xmlText = XML.toString(jsonObj);
+    return xmlText;
+  }
+
+  /**
+   * Takes a text string representing a valid XML structure and converts it to
+   * an equivalent JSON string.
+   * 
+   * @param xmlText - The XML string to convert to JSON.
+   * 
+   * @return - A JSON string representation of the supplied XML string.
+   */
+  public static String convertXmlToJson(String xmlText) {
+    JSONObject jsonObj = XML.toJSONObject(xmlText);
+    return jsonObj.toString();
+  }
+}