Create plural version of deleteDataNode

- Add method to CpsDataService to batch delete data nodes and lists
- Use native queries to batch delete fragment entities by xpaths,
  for data nodes and lists
- Add performance tests for batch delete
- Refactor FragmentNativeRepository
- Add single-column version of createTemporaryTable
- Renamed metric cps.data.service.datanode.batch.delete
  to cps.data.service.datanode.all.delete

Issue-ID: CPS-1438
Signed-off-by: danielhanrahan <daniel.hanrahan@est.tech>
Change-Id: I1851f9c7ef0b1be4bd421b3352d9697a2dd23f79

6 files changed, 123 insertions, 45 deletions

diff --git a/cps-ri/src/main/java/org/onap/cps/spi/impl/CpsDataPersistenceServiceImpl.java b/cps-ri/src/main/java/org/onap/cps/spi/impl/CpsDataPersistenceServiceImpl.java
index d2b7273fe..5b310efd5 100644
--- a/cps-ri/src/main/java/org/onap/cps/spi/impl/CpsDataPersistenceServiceImpl.java
+++ b/cps-ri/src/main/java/org/onap/cps/spi/impl/CpsDataPersistenceServiceImpl.java
@@ -61,7 +61,6 @@ import org.onap.cps.spi.model.DataNode;
 import org.onap.cps.spi.model.DataNodeBuilder;
 import org.onap.cps.spi.repository.AnchorRepository;
 import org.onap.cps.spi.repository.DataspaceRepository;
-import org.onap.cps.spi.repository.FragmentNativeRepository;
 import org.onap.cps.spi.repository.FragmentQueryBuilder;
 import org.onap.cps.spi.repository.FragmentRepository;
 import org.onap.cps.spi.utils.SessionManager;
@@ -79,7 +78,6 @@ public class CpsDataPersistenceServiceImpl implements CpsDataPersistenceService
     private final FragmentRepository fragmentRepository;
     private final JsonObjectMapper jsonObjectMapper;
     private final SessionManager sessionManager;
-    private final FragmentNativeRepository fragmentNativeRepositoryImpl;
 
     private static final String REG_EX_FOR_OPTIONAL_LIST_INDEX = "(\\[@[\\s\\S]+?]){0,1})";
 
@@ -609,6 +607,26 @@ public class CpsDataPersistenceServiceImpl implements CpsDataPersistenceService
 
     @Override
     @Transactional
+    public void deleteDataNodes(final String dataspaceName, final String anchorName,
+                                final Collection<String> xpathsToDelete) {
+        final DataspaceEntity dataspaceEntity = dataspaceRepository.getByName(dataspaceName);
+        final AnchorEntity anchorEntity = anchorRepository.getByDataspaceAndName(dataspaceEntity, anchorName);
+
+        final Collection<String> normalizedXpaths = new ArrayList<>(xpathsToDelete.size());
+        for (final String xpath : xpathsToDelete) {
+            try {
+                normalizedXpaths.add(CpsPathUtil.getNormalizedXpath(xpath));
+            } catch (final PathParsingException e) {
+                log.debug("Error parsing xpath \"{}\" in deleteDataNodes: {}", xpath, e.getMessage());
+            }
+        }
+
+        fragmentRepository.deleteByAnchorIdAndXpaths(anchorEntity.getId(), normalizedXpaths);
+        fragmentRepository.deleteListsByAnchorIdAndXpaths(anchorEntity.getId(), normalizedXpaths);
+    }
+
+    @Override
+    @Transactional
     public void deleteListDataNode(final String dataspaceName, final String anchorName,
                                    final String targetXpath) {
         deleteDataNode(dataspaceName, anchorName, targetXpath, true);
@@ -656,7 +674,7 @@ public class CpsDataPersistenceServiceImpl implements CpsDataPersistenceService
     private boolean deleteDataNode(final FragmentEntity parentFragmentEntity, final String targetXpath) {
         final String normalizedTargetXpath = CpsPathUtil.getNormalizedXpath(targetXpath);
         if (parentFragmentEntity.getXpath().equals(normalizedTargetXpath)) {
-            fragmentNativeRepositoryImpl.deleteFragmentEntity(parentFragmentEntity.getId());
+            fragmentRepository.deleteFragmentEntity(parentFragmentEntity.getId());
             return true;
         }
         if (parentFragmentEntity.getChildFragments()
diff --git a/cps-ri/src/main/java/org/onap/cps/spi/repository/FragmentNativeRepository.java b/cps-ri/src/main/java/org/onap/cps/spi/repository/FragmentNativeRepository.java
index 4cfd79dee..13320bf76 100644
--- a/cps-ri/src/main/java/org/onap/cps/spi/repository/FragmentNativeRepository.java
+++ b/cps-ri/src/main/java/org/onap/cps/spi/repository/FragmentNativeRepository.java
@@ -20,9 +20,31 @@
 
 package org.onap.cps.spi.repository;
 
+import java.util.Collection;
+
 /**
  * This interface is used in delete fragment entity by id with child using native sql queries.
  */
 public interface FragmentNativeRepository {
     void deleteFragmentEntity(long fragmentEntityId);
+
+    /**
+     * Delete fragment entities for each supplied xpath.
+     * This method will delete list elements or other data nodes, but not whole lists.
+     * Non-existing xpaths will not result in an exception.
+     * @param anchorId the id of the anchor
+     * @param xpaths   xpaths of data nodes to remove
+     */
+    void deleteByAnchorIdAndXpaths(int anchorId, Collection<String> xpaths);
+
+    /**
+     * Delete fragment entities that are list elements of each supplied list xpath.
+     * For example, if xpath '/parent/list' is provided, then list all elements in '/parent/list' will be deleted,
+     * e.g. /parent/list[@key='A'], /parent/list[@key='B'].
+     * This method will only delete whole lists by xpath; xpaths to list elements or other data nodes will be ignored.
+     * Non-existing xpaths will not result in an exception.
+     * @param anchorId   the id of the anchor
+     * @param listXpaths xpaths of whole lists to remove
+     */
+    void deleteListsByAnchorIdAndXpaths(int anchorId, Collection<String> listXpaths);
 }
diff --git a/cps-ri/src/main/java/org/onap/cps/spi/repository/FragmentNativeRepositoryImpl.java b/cps-ri/src/main/java/org/onap/cps/spi/repository/FragmentNativeRepositoryImpl.java
index 57dca568f..0e4d359da 100644
--- a/cps-ri/src/main/java/org/onap/cps/spi/repository/FragmentNativeRepositoryImpl.java
+++ b/cps-ri/src/main/java/org/onap/cps/spi/repository/FragmentNativeRepositoryImpl.java
@@ -20,13 +20,12 @@
 
 package org.onap.cps.spi.repository;
 
-import java.sql.PreparedStatement;
+import java.util.Collection;
 import javax.persistence.EntityManager;
 import javax.persistence.PersistenceContext;
-import org.hibernate.Session;
-import org.springframework.stereotype.Repository;
+import lombok.RequiredArgsConstructor;
 
-@Repository
+@RequiredArgsConstructor
 public class FragmentNativeRepositoryImpl implements FragmentNativeRepository {
 
     private static final String DROP_FRAGMENT_CONSTRAINT
@@ -34,28 +33,62 @@ public class FragmentNativeRepositoryImpl implements FragmentNativeRepository {
     private static final String ADD_FRAGMENT_CONSTRAINT_WITH_CASCADE
             = "ALTER TABLE fragment ADD CONSTRAINT fragment_parent_id_fkey FOREIGN KEY (parent_id) "
             + "REFERENCES fragment (id) ON DELETE CASCADE;";
-    private static final String DELETE_FRAGMENT = "DELETE FROM fragment WHERE id =?;";
     private static final String ADD_ORIGINAL_FRAGMENT_CONSTRAINT
             = "ALTER TABLE fragment ADD CONSTRAINT fragment_parent_id_fkey FOREIGN KEY (parent_id) "
             + "REFERENCES fragment (id) ON DELETE NO ACTION;";
 
     @PersistenceContext
-    private EntityManager entityManager;
+    private final EntityManager entityManager;
+
+    private final TempTableCreator tempTableCreator;
 
     @Override
     public void deleteFragmentEntity(final long fragmentEntityId) {
-        final Session session = entityManager.unwrap(Session.class);
-        session.doWork(connection -> {
-            try (PreparedStatement preparedStatement = connection.prepareStatement(
+        entityManager.createNativeQuery(
+                DROP_FRAGMENT_CONSTRAINT
+                    + ADD_FRAGMENT_CONSTRAINT_WITH_CASCADE
+                    + "DELETE FROM fragment WHERE id = ?;"
+                    + DROP_FRAGMENT_CONSTRAINT
+                    + ADD_ORIGINAL_FRAGMENT_CONSTRAINT)
+            .setParameter(1, fragmentEntityId)
+            .executeUpdate();
+    }
+
+    @Override
+    // Accept security hotspot as temporary table name in SQL query is created internally, not from user input.
+    @SuppressWarnings("squid:S2077")
+    public void deleteByAnchorIdAndXpaths(final int anchorId, final Collection<String> xpaths) {
+        if (!xpaths.isEmpty()) {
+            final String tempTableName = tempTableCreator.createTemporaryTable("xpathsToDelete", xpaths, "xpath");
+            entityManager.createNativeQuery(
                     DROP_FRAGMENT_CONSTRAINT
-                            + ADD_FRAGMENT_CONSTRAINT_WITH_CASCADE
-                            + DELETE_FRAGMENT
-                            + DROP_FRAGMENT_CONSTRAINT
-                            + ADD_ORIGINAL_FRAGMENT_CONSTRAINT)) {
-                preparedStatement.setLong(1, fragmentEntityId);
-                preparedStatement.executeUpdate();
-            }
-        });
+                        + ADD_FRAGMENT_CONSTRAINT_WITH_CASCADE
+                        + "DELETE FROM fragment f USING " + tempTableName + " t"
+                        + " WHERE f.anchor_id = :anchorId AND f.xpath = t.xpath;"
+                        + DROP_FRAGMENT_CONSTRAINT
+                        + ADD_ORIGINAL_FRAGMENT_CONSTRAINT)
+                .setParameter("anchorId", anchorId)
+                .executeUpdate();
+        }
     }
-}
 
+    @Override
+    // Accept security hotspot as temporary table name in SQL query is created internally, not from user input.
+    @SuppressWarnings("squid:S2077")
+    public void deleteListsByAnchorIdAndXpaths(final int anchorId, final Collection<String> xpaths) {
+        if (!xpaths.isEmpty()) {
+            final String tempTableName = tempTableCreator.createTemporaryTable("xpathsToDelete", xpaths, "xpath");
+            entityManager.createNativeQuery(
+                DROP_FRAGMENT_CONSTRAINT
+                    + ADD_FRAGMENT_CONSTRAINT_WITH_CASCADE
+                    + "DELETE FROM fragment f USING " + tempTableName + " t"
+                    + " WHERE f.anchor_id = :anchorId AND f.xpath LIKE CONCAT(t.xpath, :xpathListPattern);"
+                    + DROP_FRAGMENT_CONSTRAINT
+                    + ADD_ORIGINAL_FRAGMENT_CONSTRAINT)
+                .setParameter("anchorId", anchorId)
+                .setParameter("xpathListPattern", "[%%")
+                .executeUpdate();
+        }
+    }
+
+}
diff --git a/cps-ri/src/main/java/org/onap/cps/spi/repository/FragmentRepository.java b/cps-ri/src/main/java/org/onap/cps/spi/repository/FragmentRepository.java
index 4b42b2da8..8bdb7d985 100755
--- a/cps-ri/src/main/java/org/onap/cps/spi/repository/FragmentRepository.java
+++ b/cps-ri/src/main/java/org/onap/cps/spi/repository/FragmentRepository.java
@@ -1,6 +1,6 @@
 /*

  * ============LICENSE_START=======================================================

- * Copyright (C) 2021-2022 Nordix Foundation.

+ * Copyright (C) 2021-2023 Nordix Foundation.

  * Modifications Copyright (C) 2020-2021 Bell Canada.

  * Modifications Copyright (C) 2020-2021 Pantheon.tech.

  * ================================================================================

@@ -40,7 +40,7 @@ import org.springframework.stereotype.Repository;
 

 @Repository

 public interface FragmentRepository extends JpaRepository<FragmentEntity, Long>, FragmentRepositoryCpsPathQuery,

-        FragmentRepositoryMultiPathQuery {

+        FragmentRepositoryMultiPathQuery, FragmentNativeRepository {

 

     Optional<FragmentEntity> findByDataspaceAndAnchorAndXpath(@NonNull DataspaceEntity dataspaceEntity,

                                                               @NonNull AnchorEntity anchorEntity,

diff --git a/cps-ri/src/main/java/org/onap/cps/spi/repository/FragmentRepositoryMultiPathQueryImpl.java b/cps-ri/src/main/java/org/onap/cps/spi/repository/FragmentRepositoryMultiPathQueryImpl.java
index 8c357bbb3..151fe97b3 100644
--- a/cps-ri/src/main/java/org/onap/cps/spi/repository/FragmentRepositoryMultiPathQueryImpl.java
+++ b/cps-ri/src/main/java/org/onap/cps/spi/repository/FragmentRepositoryMultiPathQueryImpl.java
@@ -20,28 +20,24 @@
 
 package org.onap.cps.spi.repository;
 
-
-import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Collections;
-import java.util.HashSet;
 import java.util.List;
 import javax.persistence.EntityManager;
 import javax.persistence.PersistenceContext;
 import javax.transaction.Transactional;
-import lombok.AllArgsConstructor;
+import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 import org.onap.cps.spi.entities.FragmentEntity;
 
-
 @Slf4j
-@AllArgsConstructor
+@RequiredArgsConstructor
 public class FragmentRepositoryMultiPathQueryImpl implements FragmentRepositoryMultiPathQuery {
 
     @PersistenceContext
-    private EntityManager entityManager;
+    private final EntityManager entityManager;
 
-    private TempTableCreator tempTableCreator;
+    private final TempTableCreator tempTableCreator;
 
     @Override
     @Transactional
@@ -50,24 +46,13 @@ public class FragmentRepositoryMultiPathQueryImpl implements FragmentRepositoryM
         if (cpsPathQueryList.isEmpty()) {
             return Collections.emptyList();
         }
-        final Collection<List<String>> sqlData = new HashSet<>(cpsPathQueryList.size());
-        for (final String query : cpsPathQueryList) {
-            final List<String> row = new ArrayList<>(1);
-            row.add(query);
-            sqlData.add(row);
-        }
-
         final String tempTableName = tempTableCreator.createTemporaryTable(
-                "xpathTemporaryTable", sqlData, "xpath");
-        return selectMatchingFragments(anchorId, tempTableName);
-    }
-
-    private List<FragmentEntity> selectMatchingFragments(final Integer anchorId, final String tempTableName) {
+            "xpathTemporaryTable", cpsPathQueryList, "xpath");
         final String sql = String.format(
             "SELECT * FROM FRAGMENT WHERE anchor_id = %d AND xpath IN (select xpath FROM %s);",
             anchorId, tempTableName);
         final List<FragmentEntity> fragmentEntities = entityManager.createNativeQuery(sql, FragmentEntity.class)
-                .getResultList();
+            .getResultList();
         log.debug("Fetched {} fragment entities by anchor and cps path.", fragmentEntities.size());
         return fragmentEntities;
     }
diff --git a/cps-ri/src/main/java/org/onap/cps/spi/repository/TempTableCreator.java b/cps-ri/src/main/java/org/onap/cps/spi/repository/TempTableCreator.java
index d713746e4..338b0b1c6 100644
--- a/cps-ri/src/main/java/org/onap/cps/spi/repository/TempTableCreator.java
+++ b/cps-ri/src/main/java/org/onap/cps/spi/repository/TempTableCreator.java
@@ -1,6 +1,6 @@
 /*-
  * ============LICENSE_START=======================================================
- *  Copyright (C) 2022 Nordix Foundation.
+ *  Copyright (C) 2022-2023 Nordix Foundation.
  * ================================================================================
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -20,8 +20,10 @@
 
 package org.onap.cps.spi.repository;
 
+import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
+import java.util.Collections;
 import java.util.HashSet;
 import java.util.Iterator;
 import java.util.List;
@@ -63,6 +65,24 @@ public class TempTableCreator {
         return tempTableName;
     }
 
+    /**
+     * Create a uniquely named temporary table with a single column.
+     *
+     * @param prefix     prefix for the table name (so you can recognize it)
+     * @param sqlData    data to insert (strings only); each entry is a single row of data
+     * @param columnName column name
+     * @return a unique temporary table name with given prefix
+     */
+    public String createTemporaryTable(final String prefix,
+                                       final Collection<String> sqlData,
+                                       final String columnName) {
+        final Collection<List<String>> tableData = new ArrayList<>(sqlData.size());
+        for (final String entry : sqlData) {
+            tableData.add(Collections.singletonList(entry));
+        }
+        return createTemporaryTable(prefix, tableData, columnName);
+    }
+
     private static void defineColumns(final StringBuilder sqlStringBuilder, final String[] columnNames) {
         sqlStringBuilder.append('(');
         final Iterator<String> it = Arrays.stream(columnNames).iterator();