CPS-1401 Implement V2 of GET Data Node API

- Modified the GET Data Node API so it returns all the data nodes when
  xpath set to root "/"
- Fragment Repository now returns a collection of Fragment Entities
- Instead of returning only the first Fragment Entity now all fragment
  entities are returned when xpath is set to root
- The Fragemnt Entities are further processed to a Collection of Data
  Nodes. As opposed to singular Data Node in current implementation.
- Finally the DataRestController also returns a Collection of Data
  Nodes when xpath is set to root and valid data is present
- Response body changed from JSON object to JSON Array.
- Exception handling for invalid xpath and non-existing xpath is now
  done separately at persistence layer.
- Refactored code against CPS-1422
- Deprecated getDataNode method from Service and Persistence layer
- Modified V1 of Get Data Node API to use the getDataNodes method and
  get the first data node from the collection returned.
- Modified NCMP to use getDataNodes method
- NCMP still does not support multiple data nodes. It retrieves the
  first data node from the collection returned by getDataNodes

Signed-off-by: arpitsingh <as00745003@techmahindra.com>
Change-Id: I494a5740a53f65376d135fcb9f1e2e8900a2803e

6 files changed, 114 insertions, 91 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 5b310efd5..46439fdb3 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
@@ -3,7 +3,7 @@
  *  Copyright (C) 2021-2023 Nordix Foundation
  *  Modifications Copyright (C) 2021 Pantheon.tech
  *  Modifications Copyright (C) 2020-2022 Bell Canada.
- *  Modifications Copyright (C) 2022 TechMahindra Ltd.
+ *  Modifications Copyright (C) 2022-2023 TechMahindra Ltd.
  *  ================================================================================
  *  Licensed under the Apache License, Version 2.0 (the "License");
  *  you may not use this file except in compliance with the License.
@@ -249,17 +249,22 @@ public class CpsDataPersistenceServiceImpl implements CpsDataPersistenceService
     }
 
     @Override
-    public DataNode getDataNode(final String dataspaceName, final String anchorName, final String xpath,
-                                final FetchDescendantsOption fetchDescendantsOption) {
-        final FragmentEntity fragmentEntity = getFragmentByXpath(dataspaceName, anchorName, xpath,
-            fetchDescendantsOption);
-        return toDataNode(fragmentEntity, fetchDescendantsOption);
+    public Collection<DataNode> getDataNodes(final String dataspaceName, final String anchorName,
+                                             final String xpath,
+                                             final FetchDescendantsOption fetchDescendantsOption) {
+        final String targetXpath = isRootXpath(xpath) ? xpath : CpsPathUtil.getNormalizedXpath(xpath);
+        final Collection<DataNode> dataNodes = getDataNodesForMultipleXpaths(dataspaceName, anchorName,
+                Collections.singletonList(targetXpath), fetchDescendantsOption);
+        if (dataNodes.isEmpty()) {
+            throw new DataNodeNotFoundException(dataspaceName, anchorName, xpath);
+        }
+        return dataNodes;
     }
 
     @Override
-    public Collection<DataNode> getDataNodes(final String dataspaceName, final String anchorName,
-                                             final Collection<String> xpaths,
-                                             final FetchDescendantsOption fetchDescendantsOption) {
+    public Collection<DataNode> getDataNodesForMultipleXpaths(final String dataspaceName, final String anchorName,
+                                                              final Collection<String> xpaths,
+                                                              final FetchDescendantsOption fetchDescendantsOption) {
         final DataspaceEntity dataspaceEntity = dataspaceRepository.getByName(dataspaceName);
         final AnchorEntity anchorEntity = anchorRepository.getByDataspaceAndName(dataspaceEntity, anchorName);
 
@@ -271,7 +276,7 @@ public class CpsDataPersistenceServiceImpl implements CpsDataPersistenceService
             try {
                 normalizedXpaths.add(CpsPathUtil.getNormalizedXpath(xpath));
             } catch (final PathParsingException e) {
-                log.warn("Error parsing xpath \"{}\" in getDataNodes: {}", xpath, e.getMessage());
+                log.warn("Error parsing xpath \"{}\" in getDataNodesForMultipleXpaths: {}", xpath, e.getMessage());
             }
         }
         final Collection<FragmentEntity> fragmentEntities =
diff --git a/cps-ri/src/test/groovy/org/onap/cps/spi/impl/CpsDataPersistenceServiceIntegrationSpec.groovy b/cps-ri/src/test/groovy/org/onap/cps/spi/impl/CpsDataPersistenceServiceIntegrationSpec.groovy
index e4c552978..336d6035a 100755
--- a/cps-ri/src/test/groovy/org/onap/cps/spi/impl/CpsDataPersistenceServiceIntegrationSpec.groovy
+++ b/cps-ri/src/test/groovy/org/onap/cps/spi/impl/CpsDataPersistenceServiceIntegrationSpec.groovy
@@ -3,7 +3,7 @@
  *  Copyright (C) 2021-2023 Nordix Foundation
  *  Modifications Copyright (C) 2021 Pantheon.tech
  *  Modifications Copyright (C) 2021-2022 Bell Canada.
- *  Modifications Copyright (C) 2022 TechMahindra Ltd.
+ *  Modifications Copyright (C) 2022-2023 TechMahindra Ltd.
  *  ================================================================================
  *  Licensed under the Apache License, Version 2.0 (the "License");
  *  you may not use this file except in compliance with the License.
@@ -41,6 +41,7 @@ import org.springframework.beans.factory.annotation.Autowired
 import org.springframework.test.context.jdbc.Sql
 
 import javax.validation.ConstraintViolationException
+import java.nio.file.Path
 
 import static org.onap.cps.spi.FetchDescendantsOption.INCLUDE_ALL_DESCENDANTS
 import static org.onap.cps.spi.FetchDescendantsOption.OMIT_DESCENDANTS
@@ -82,15 +83,13 @@ class CpsDataPersistenceServiceIntegrationSpec extends CpsPersistenceSpecBase {
     ]
 
     @Sql([CLEAR_DATA, SET_DATA])
-    def 'Get existing datanode with descendants.'() {
-        when: 'the node is retrieved by its xpath'
-            def dataNode = objectUnderTest.getDataNode(DATASPACE_NAME, ANCHOR_NAME1, '/parent-1', INCLUDE_ALL_DESCENDANTS)
-        then: 'the path and prefix are populated correctly'
-            assert dataNode.xpath == '/parent-1'
-        and: 'dataNode has no prefix (to be addressed by CPS-1301'
-            assert dataNode.moduleNamePrefix == null
-        and: 'the child node has the correct path'
-            assert dataNode.childDataNodes[0].xpath == '/parent-1/child-1'
+    def 'Get all datanodes with descendants .'() {
+        when: 'data nodes are retrieved by their xpath'
+            def dataNodes = objectUnderTest.getDataNodesForMultipleXpaths(DATASPACE_NAME, ANCHOR_NAME1, ['/parent-1'], INCLUDE_ALL_DESCENDANTS)
+        then: 'same data nodes are returned by getDataNodesForMultipleXpaths method'
+            assert objectUnderTest.getDataNodes(DATASPACE_NAME, ANCHOR_NAME1, '/parent-1', INCLUDE_ALL_DESCENDANTS) == dataNodes
+        and: 'the dataNodes have no prefix (to be addressed by CPS-1301)'
+            assert dataNodes[0].moduleNamePrefix == null
     }
 
     @Sql([CLEAR_DATA, SET_DATA])
@@ -102,11 +101,11 @@ class CpsDataPersistenceServiceIntegrationSpec extends CpsPersistenceSpecBase {
             def dataNodes = [createDataNodeTree(parentXpath, childXpath, grandChildXpath)]
             objectUnderTest.storeDataNodes(DATASPACE_NAME, ANCHOR_NAME1, dataNodes)
         then: 'it can be retrieved by its xpath'
-            def dataNode = objectUnderTest.getDataNode(DATASPACE_NAME, ANCHOR_NAME1, parentXpath, INCLUDE_ALL_DESCENDANTS)
-            assert dataNode.xpath == parentXpath
+            def dataNode = objectUnderTest.getDataNodes(DATASPACE_NAME, ANCHOR_NAME1, parentXpath, INCLUDE_ALL_DESCENDANTS)
+            assert dataNode[0].xpath == parentXpath
         and: 'it has the correct child'
-            assert dataNode.childDataNodes.size() == 1
-            def childDataNode = dataNode.childDataNodes[0]
+            assert dataNode[0].childDataNodes.size() == 1
+            def childDataNode = dataNode[0].childDataNodes[0]
             assert childDataNode.xpath == childXpath
         and: 'and its grandchild'
             assert childDataNode.childDataNodes.size() == 1
@@ -236,18 +235,19 @@ class CpsDataPersistenceServiceIntegrationSpec extends CpsPersistenceSpecBase {
     }
 
     @Sql([CLEAR_DATA, SET_DATA])
-    def 'Get data node by xpath without descendants.'() {
-        when: 'data node is requested'
-            def result = objectUnderTest.getDataNode(DATASPACE_NAME, ANCHOR_HAVING_SINGLE_TOP_LEVEL_FRAGMENT,
-                    inputXPath, OMIT_DESCENDANTS)
-        then: 'data node is returned with no descendants'
-            assert result.xpath == XPATH_DATA_NODE_WITH_LEAVES
-        and: 'expected leaves'
-            assert result.childDataNodes.size() == 0
-            assertLeavesMaps(result.leaves, expectedLeavesByXpathMap[XPATH_DATA_NODE_WITH_LEAVES])
-        where: 'the following data is used'
+    def 'Get all data nodes by single xpath without descendants : #scenario'() {
+        when: 'data nodes are requested'
+            def result = objectUnderTest.getDataNodesForMultipleXpaths(DATASPACE_NAME, ANCHOR_WITH_MULTIPLE_TOP_LEVEL_FRAGMENTS,
+                [inputXPath], OMIT_DESCENDANTS)
+        then: 'data nodes under root are returned'
+            assert result.childDataNodes.size() == 2
+        and: 'no descendants of parent nodes are returned'
+            result.each {assert it.childDataNodes.size() == 0}
+        and: 'same data nodes are returned when V2 of get Data Nodes API is executed'
+            assert objectUnderTest.getDataNodes(DATASPACE_NAME, ANCHOR_WITH_MULTIPLE_TOP_LEVEL_FRAGMENTS,
+                inputXPath, OMIT_DESCENDANTS) == result
+        where: 'the following xpath is used'
             scenario      | inputXPath
-            'some xpath'  | '/parent-207'
             'root xpath'  | '/'
             'empty xpath' | ''
     }
@@ -255,51 +255,50 @@ class CpsDataPersistenceServiceIntegrationSpec extends CpsPersistenceSpecBase {
     @Sql([CLEAR_DATA, SET_DATA])
     def 'Cps Path query with syntax error throws a CPS Path Exception.'() {
         when: 'trying to execute a query with a syntax (parsing) error'
-            objectUnderTest.getDataNode(DATASPACE_NAME, ANCHOR_FOR_DATA_NODES_WITH_LEAVES, 'invalid-cps-path/child' , OMIT_DESCENDANTS)
+            objectUnderTest.getDataNodes(DATASPACE_NAME, ANCHOR_FOR_DATA_NODES_WITH_LEAVES, 'invalid-cps-path/child' , OMIT_DESCENDANTS)
         then: 'exception is thrown'
-            def exceptionThrown = thrown(CpsPathException)
-            assert exceptionThrown.getDetails().contains('failed to parse at line 1 due to extraneous input \'invalid-cps-path\' expecting \'/\'')
+            def exceptionThrown = thrown(PathParsingException)
+            assert exceptionThrown.getMessage().contains('failed to parse at line 1 due to extraneous input \'invalid-cps-path\' expecting \'/\'')
     }
 
     @Sql([CLEAR_DATA, SET_DATA])
-    def 'Get data node by xpath with all descendants.'() {
-        when: 'data node is requested with all descendants'
-            def result = objectUnderTest.getDataNode(DATASPACE_NAME, ANCHOR_HAVING_SINGLE_TOP_LEVEL_FRAGMENT,
-                    inputXPath, INCLUDE_ALL_DESCENDANTS)
-            def mappedResult = treeToFlatMapByXpath(new HashMap<>(), result)
-        then: 'data node is returned with all the descendants populated'
-            assert mappedResult.size() == 4
+    def 'Get all data nodes by single xpath with all descendants : #scenario'() {
+        when: 'data nodes are requested with all descendants'
+            def result = objectUnderTest.getDataNodesForMultipleXpaths(DATASPACE_NAME, ANCHOR_WITH_MULTIPLE_TOP_LEVEL_FRAGMENTS,
+                [inputXPath], INCLUDE_ALL_DESCENDANTS)
+            def mappedResult = multipleTreesToFlatMapByXpath(new HashMap<>(), result)
+        then: 'data nodes are returned with all the descendants populated'
+            assert mappedResult.size() == 8
             assert result.childDataNodes.size() == 2
-            assert mappedResult.get('/parent-207/child-001').childDataNodes.size() == 0
-            assert mappedResult.get('/parent-207/child-002').childDataNodes.size() == 1
-        and: 'extracted leaves maps are matching expected'
-            mappedResult.forEach(
-                    (xPath, dataNode) -> assertLeavesMaps(dataNode.leaves, expectedLeavesByXpathMap[xPath]))
+            assert mappedResult.get('/parent-208/child-001').childDataNodes.size() == 0
+            assert mappedResult.get('/parent-208/child-002').childDataNodes.size() == 1
+            assert mappedResult.get('/parent-209/child-001').childDataNodes.size() == 0
+            assert mappedResult.get('/parent-209/child-002').childDataNodes.size() == 1
+        and: 'same data nodes are returned when V2 of Get Data Nodes API is executed'
+            assert objectUnderTest.getDataNodes(DATASPACE_NAME, ANCHOR_WITH_MULTIPLE_TOP_LEVEL_FRAGMENTS,
+                inputXPath, INCLUDE_ALL_DESCENDANTS) == result
         where: 'the following data is used'
             scenario      | inputXPath
-            'some xpath'  | '/parent-207'
             'root xpath'  | '/'
             'empty xpath' | ''
     }
 
     @Sql([CLEAR_DATA, SET_DATA])
-    def 'Get data node error scenario: #scenario.'() {
-        when: 'attempt to get data node with #scenario'
-            objectUnderTest.getDataNode(dataspaceName, anchorName, xpath, OMIT_DESCENDANTS)
-        then: 'a #expectedException is thrown'
+    def 'Get data nodes error scenario : #scenario.'() {
+        when: 'attempt to get data nodes with #scenario'
+            objectUnderTest.getDataNodes(dataspaceName, anchorName, xpath, OMIT_DESCENDANTS)
+        then: 'an #expectedException is thrown'
             thrown(expectedException)
         where: 'the following data is used'
-            scenario                 | dataspaceName  | anchorName                        | xpath           || expectedException
-            'non-existing dataspace' | 'NO DATASPACE' | 'not relevant'                    | '/not relevant' || DataspaceNotFoundException
-            'non-existing anchor'    | DATASPACE_NAME | 'NO ANCHOR'                       | '/not relevant' || AnchorNotFoundException
-            'non-existing xpath'     | DATASPACE_NAME | ANCHOR_FOR_DATA_NODES_WITH_LEAVES | '/NO-XPATH'     || DataNodeNotFoundException
-            'invalid xpath'          | DATASPACE_NAME | ANCHOR_FOR_DATA_NODES_WITH_LEAVES | 'INVALID XPATH' || CpsPathException
+            scenario             | dataspaceName  | anchorName                        | xpath           || expectedException
+            'non existing xpath' | DATASPACE_NAME | ANCHOR_FOR_DATA_NODES_WITH_LEAVES | '/NO-XPATH'     || DataNodeNotFoundException
+            'invalid Xpath'      | DATASPACE_NAME | ANCHOR_FOR_DATA_NODES_WITH_LEAVES | 'INVALID XPATH' || PathParsingException
     }
 
     @Sql([CLEAR_DATA, SET_DATA])
-    def 'Get multiple data nodes by xpath.'() {
+    def 'Get data nodes for multiple xpaths.'() {
         when: 'fetch #scenario.'
-            def results = objectUnderTest.getDataNodes(DATASPACE_NAME, ANCHOR_NAME3, inputXpaths, OMIT_DESCENDANTS)
+            def results = objectUnderTest.getDataNodesForMultipleXpaths(DATASPACE_NAME, ANCHOR_NAME3, inputXpaths, OMIT_DESCENDANTS)
         then: 'the expected number of data nodes are returned'
             assert results.size() == expectedResultSize
         where: 'following parameters were used'
@@ -323,9 +322,9 @@ class CpsDataPersistenceServiceIntegrationSpec extends CpsPersistenceSpecBase {
     }
 
     @Sql([CLEAR_DATA, SET_DATA])
-    def 'Get multiple data nodes error scenario: #scenario.'() {
+    def 'Get data nodes for collection of xpath error scenario : #scenario.'() {
         when: 'attempt to get data nodes with #scenario'
-            objectUnderTest.getDataNodes(dataspaceName, anchorName, ['/not-relevant'], OMIT_DESCENDANTS)
+            objectUnderTest.getDataNodesForMultipleXpaths(dataspaceName, anchorName, ['/not-relevant'], OMIT_DESCENDANTS)
         then: 'a #expectedException is thrown'
             thrown(expectedException)
         where: 'the following data is used'
@@ -599,11 +598,11 @@ class CpsDataPersistenceServiceIntegrationSpec extends CpsPersistenceSpecBase {
             def child = new DataNodeBuilder().withXpath(deleteTestChildXpath).withChildDataNodes([grandChild]).build()
             objectUnderTest.addChildDataNode(DATASPACE_NAME, ANCHOR_NAME3, deleteTestParentXPath, child)
         and: 'number of children before delete is stored'
-            def numberOfChildrenBeforeDelete = objectUnderTest.getDataNode(DATASPACE_NAME, ANCHOR_NAME3, pathToParentOfDeletedNode, INCLUDE_ALL_DESCENDANTS).childDataNodes.size()
+            def numberOfChildrenBeforeDelete = objectUnderTest.getDataNodes(DATASPACE_NAME, ANCHOR_NAME3, pathToParentOfDeletedNode, INCLUDE_ALL_DESCENDANTS)[0].childDataNodes.size()
         when: 'target node is deleted'
             objectUnderTest.deleteDataNode(DATASPACE_NAME, ANCHOR_NAME3, deleteTarget)
         then: 'one child has been deleted'
-            def numberOfChildrenAfterDelete = objectUnderTest.getDataNode(DATASPACE_NAME, ANCHOR_NAME3, pathToParentOfDeletedNode, INCLUDE_ALL_DESCENDANTS).childDataNodes.size()
+            def numberOfChildrenAfterDelete = objectUnderTest.getDataNodes(DATASPACE_NAME, ANCHOR_NAME3, pathToParentOfDeletedNode, INCLUDE_ALL_DESCENDANTS)[0].childDataNodes.size()
             assert numberOfChildrenAfterDelete == numberOfChildrenBeforeDelete - 1
         where:
             scenario                | deleteTarget              | pathToParentOfDeletedNode
@@ -634,13 +633,13 @@ class CpsDataPersistenceServiceIntegrationSpec extends CpsPersistenceSpecBase {
         and: 'data nodes are deleted'
             objectUnderTest.deleteDataNode(DATASPACE_NAME, ANCHOR_NAME3, xpathForDeletion)
         when: 'verify data nodes are removed'
-            objectUnderTest.getDataNode(DATASPACE_NAME, ANCHOR_NAME3, xpathForDeletion, INCLUDE_ALL_DESCENDANTS)
+            objectUnderTest.getDataNodes(DATASPACE_NAME, ANCHOR_NAME3, xpathForDeletion, INCLUDE_ALL_DESCENDANTS)
         then:
             thrown(DataNodeNotFoundException)
         and: 'some related object is not deleted'
             if (xpathSurvivor!=null) {
-                dataNode = objectUnderTest.getDataNode(DATASPACE_NAME, ANCHOR_NAME3, xpathSurvivor, INCLUDE_ALL_DESCENDANTS)
-                assert dataNode.xpath == xpathSurvivor
+                dataNode = objectUnderTest.getDataNodes(DATASPACE_NAME, ANCHOR_NAME3, xpathSurvivor, INCLUDE_ALL_DESCENDANTS)
+                assert dataNode[0].xpath == xpathSurvivor
             }
         where: 'following parameters were used'
             scenario                               | xpathForDeletion                                  || xpathSurvivor
@@ -711,6 +710,15 @@ class CpsDataPersistenceServiceIntegrationSpec extends CpsPersistenceSpecBase {
         return flatMap
     }
 
+    def static multipleTreesToFlatMapByXpath(Map<String, DataNode> flatMap, Collection<DataNode> dataNodeTrees) {
+        for (DataNode dataNodeTree: dataNodeTrees){
+            flatMap.put(dataNodeTree.xpath, dataNodeTree)
+            dataNodeTree.childDataNodes
+                .forEach(childDataNode -> multipleTreesToFlatMapByXpath(flatMap, [childDataNode]))
+        }
+        return flatMap
+    }
+
     def keysToXpaths(parent, Collection keys) {
         return keys.collect { "${parent}/child-list[@key='${it}']".toString() }
     }
diff --git a/cps-ri/src/test/groovy/org/onap/cps/spi/impl/CpsDataPersistenceServiceSpec.groovy b/cps-ri/src/test/groovy/org/onap/cps/spi/impl/CpsDataPersistenceServiceSpec.groovy
index 5cabc85b3..ac66e8c02 100644
--- a/cps-ri/src/test/groovy/org/onap/cps/spi/impl/CpsDataPersistenceServiceSpec.groovy
+++ b/cps-ri/src/test/groovy/org/onap/cps/spi/impl/CpsDataPersistenceServiceSpec.groovy
@@ -25,7 +25,6 @@ import org.hibernate.StaleStateException
 import org.onap.cps.spi.FetchDescendantsOption
 import org.onap.cps.spi.entities.AnchorEntity
 import org.onap.cps.spi.entities.FragmentEntity
-import org.onap.cps.spi.entities.FragmentExtract
 import org.onap.cps.spi.exceptions.ConcurrencyException
 import org.onap.cps.spi.exceptions.DataValidationException
 import org.onap.cps.spi.model.DataNode
@@ -112,10 +111,10 @@ class CpsDataPersistenceServiceSpec extends Specification {
         given: 'the db has a fragment with an attribute property JSON value of #scenario'
             mockFragmentWithJson("{\"some attribute\": ${dataString}}")
         when: 'getting the data node represented by this fragment'
-            def dataNode = objectUnderTest.getDataNode('my-dataspace', 'my-anchor',
+            def dataNode = objectUnderTest.getDataNodes('my-dataspace', 'my-anchor',
                     '/parent-01', FetchDescendantsOption.INCLUDE_ALL_DESCENDANTS)
         then: 'the leaf is of the correct value and data type'
-            def attributeValue = dataNode.leaves.get('some attribute')
+            def attributeValue = dataNode[0].leaves.get('some attribute')
             assert attributeValue == expectedValue
             assert attributeValue.class == expectedDataClass
         where: 'the following Data Type is passed'
@@ -136,7 +135,7 @@ class CpsDataPersistenceServiceSpec extends Specification {
         given: 'a fragment with invalid JSON'
             mockFragmentWithJson('{invalid json')
         when: 'getting the data node represented by this fragment'
-            objectUnderTest.getDataNode('my-dataspace', 'my-anchor',
+            objectUnderTest.getDataNodes('my-dataspace', 'my-anchor',
                     '/parent-01', FetchDescendantsOption.INCLUDE_ALL_DESCENDANTS)
         then: 'a data validation exception is thrown'
             thrown(DataValidationException)
@@ -151,7 +150,7 @@ class CpsDataPersistenceServiceSpec extends Specification {
             def fragmentEntity2 = new FragmentEntity(xpath: '/xpath2', childFragments: [])
             mockFragmentRepository.findByAnchorAndMultipleCpsPaths(123, ['/xpath1', '/xpath2'] as Set<String>) >> [fragmentEntity1, fragmentEntity2]
         when: 'getting data nodes for 2 xpaths'
-            def result = objectUnderTest.getDataNodes('some-dataspace', 'some-anchor', ['/xpath1', '/xpath2'], FetchDescendantsOption.INCLUDE_ALL_DESCENDANTS)
+            def result = objectUnderTest.getDataNodesForMultipleXpaths('some-dataspace', 'some-anchor', ['/xpath1', '/xpath2'], FetchDescendantsOption.INCLUDE_ALL_DESCENDANTS)
         then: '2 data nodes are returned'
             assert result.size() == 2
     }
@@ -243,10 +242,8 @@ class CpsDataPersistenceServiceSpec extends Specification {
     def mockFragmentWithJson(json) {
         def anchorEntity = new AnchorEntity(id:123)
         mockAnchorRepository.getByDataspaceAndName(*_) >> anchorEntity
-        def mockFragmentExtract = Mock(FragmentExtract)
-        mockFragmentExtract.getId() >> 456
-        mockFragmentExtract.getAttributes() >> json
-        mockFragmentRepository.findByAnchorIdAndParentXpath(*_) >> [mockFragmentExtract]
+        def fragmentEntity = new FragmentEntity(xpath: '/parent-01', childFragments: [], attributes: json)
+        mockFragmentRepository.findByAnchorAndMultipleCpsPaths(123, ['/parent-01'] as Set<String>) >> [fragmentEntity]
     }
 
 }
diff --git a/cps-ri/src/test/groovy/org/onap/cps/spi/impl/CpsPersistenceSpecBase.groovy b/cps-ri/src/test/groovy/org/onap/cps/spi/impl/CpsPersistenceSpecBase.groovy
index 1ecad4e68..30ff11b45 100644
--- a/cps-ri/src/test/groovy/org/onap/cps/spi/impl/CpsPersistenceSpecBase.groovy
+++ b/cps-ri/src/test/groovy/org/onap/cps/spi/impl/CpsPersistenceSpecBase.groovy
@@ -3,6 +3,7 @@
  *  Copyright (C) 2021-2022 Nordix Foundation
  *  Modifications Copyright (C) 2021 Pantheon.tech
  *  Modifications Copyright (C) 2021 Bell Canada.
+ *  Modifications Copyright (C) 2023 TechMahindra Ltd.
  *  ================================================================================
  *  Licensed under the Apache License, Version 2.0 (the 'License');
  *  you may not use this file except in compliance with the License.
@@ -60,13 +61,14 @@ class CpsPersistenceSpecBase extends Specification {
 
     static final String CLEAR_DATA = '/data/clear-all.sql'
 
-    static final String DATASPACE_NAME = 'DATASPACE-001'
-    static final String SCHEMA_SET_NAME1 = 'SCHEMA-SET-001'
-    static final String SCHEMA_SET_NAME2 = 'SCHEMA-SET-002'
-    static final String ANCHOR_NAME1 = 'ANCHOR-001'
-    static final String ANCHOR_NAME2 = 'ANCHOR-002'
-    static final String ANCHOR_NAME3 = 'ANCHOR-003'
-    static final String ANCHOR_FOR_DATA_NODES_WITH_LEAVES = 'ANCHOR-003'
-    static final String ANCHOR_FOR_SHOP_EXAMPLE = 'ANCHOR-004'
-    static final String ANCHOR_HAVING_SINGLE_TOP_LEVEL_FRAGMENT = 'ANCHOR-005'
+    static def DATASPACE_NAME = 'DATASPACE-001'
+    static def SCHEMA_SET_NAME1 = 'SCHEMA-SET-001'
+    static def SCHEMA_SET_NAME2 = 'SCHEMA-SET-002'
+    static def ANCHOR_NAME1 = 'ANCHOR-001'
+    static def ANCHOR_NAME2 = 'ANCHOR-002'
+    static def ANCHOR_NAME3 = 'ANCHOR-003'
+    static def ANCHOR_FOR_DATA_NODES_WITH_LEAVES = 'ANCHOR-003'
+    static def ANCHOR_FOR_SHOP_EXAMPLE = 'ANCHOR-004'
+    static def ANCHOR_HAVING_SINGLE_TOP_LEVEL_FRAGMENT = 'ANCHOR-005'
+    static def ANCHOR_WITH_MULTIPLE_TOP_LEVEL_FRAGMENTS = 'ANCHOR-006'
 }
diff --git a/cps-ri/src/test/groovy/org/onap/cps/spi/performance/CpsDataPersistenceServicePerfTest.groovy b/cps-ri/src/test/groovy/org/onap/cps/spi/performance/CpsDataPersistenceServicePerfTest.groovy
index 0c4f5ec41..246fd80bb 100644
--- a/cps-ri/src/test/groovy/org/onap/cps/spi/performance/CpsDataPersistenceServicePerfTest.groovy
+++ b/cps-ri/src/test/groovy/org/onap/cps/spi/performance/CpsDataPersistenceServicePerfTest.groovy
@@ -64,13 +64,13 @@ class CpsDataPersistenceServicePerfTest extends CpsPersistencePerfSpecBase {
     def 'Get data node with many descendants by xpath #scenario'() {
         when: 'get parent is executed with all descendants'
             stopWatch.start()
-            def result = objectUnderTest.getDataNode(PERF_DATASPACE, PERF_ANCHOR, xpath, INCLUDE_ALL_DESCENDANTS)
+            def result = objectUnderTest.getDataNodes(PERF_DATASPACE, PERF_ANCHOR, xpath, INCLUDE_ALL_DESCENDANTS)
             stopWatch.stop()
             def readDurationInMillis = stopWatch.getTotalTimeMillis()
         then: 'read duration is under 500 milliseconds'
             recordAndAssertPerformance("Get ${scenario}", 500, readDurationInMillis)
         and: 'data node is returned with all the descendants populated'
-            assert countDataNodes(result) == TOTAL_NUMBER_OF_NODES
+            assert countDataNodes(result[0]) == TOTAL_NUMBER_OF_NODES
         where: 'the following xPaths are used'
             scenario || xpath
             'parent' || PERF_TEST_PARENT
@@ -93,7 +93,7 @@ class CpsDataPersistenceServicePerfTest extends CpsPersistencePerfSpecBase {
         when: 'we query for all grandchildren (except 1 for fun) with the new native method'
             xpathsToAllGrandChildren.remove(0)
             stopWatch.start()
-            def result = objectUnderTest.getDataNodes(PERF_DATASPACE, PERF_ANCHOR, xpathsToAllGrandChildren, INCLUDE_ALL_DESCENDANTS)
+            def result = objectUnderTest.getDataNodesForMultipleXpaths(PERF_DATASPACE, PERF_ANCHOR, xpathsToAllGrandChildren, INCLUDE_ALL_DESCENDANTS)
             stopWatch.stop()
             def readDurationInMillis = stopWatch.getTotalTimeMillis()
         then: 'the returned number of entities equal to the number of children * number of grandchildren'
diff --git a/cps-ri/src/test/resources/data/fragment.sql b/cps-ri/src/test/resources/data/fragment.sql
index ad463cffd..caafcd320 100755
--- a/cps-ri/src/test/resources/data/fragment.sql
+++ b/cps-ri/src/test/resources/data/fragment.sql
@@ -52,7 +52,8 @@ INSERT INTO ANCHOR (ID, NAME, DATASPACE_ID, SCHEMA_SET_ID) VALUES
     (3001, 'ANCHOR-001', 1001, 2001),
     (3003, 'ANCHOR-003', 1001, 2001),
     (3004, 'ncmp-dmi-registry', 1002, 2001),
-    (3005, 'ANCHOR-005', 1001, 2001);
+    (3005, 'ANCHOR-005', 1001, 2001),
+    (3006, 'ANCHOR-006', 1001, 2001);
 
 INSERT INTO FRAGMENT (ID, DATASPACE_ID, ANCHOR_ID, PARENT_ID, XPATH) VALUES
     (4001, 1001, 3001, null, '/parent-1'),
@@ -69,6 +70,16 @@ INSERT INTO FRAGMENT (ID, DATASPACE_ID, ANCHOR_ID, PARENT_ID, XPATH, ATTRIBUTES)
     (5012, 1001, 3005, 5011, '/parent-207/child-002/grand-child', '{"grand-child-leaf": "grand-child-leaf value"}');
 
 INSERT INTO FRAGMENT (ID, DATASPACE_ID, ANCHOR_ID, PARENT_ID, XPATH, ATTRIBUTES) VALUES
+    (5013, 1001, 3006, null, '/parent-208', '{"parent-leaf-1": "parent-leaf value-1"}'),
+    (5014, 1001, 3006, 5013, '/parent-208/child-001', '{"first-child-leaf": "first-child-leaf value"}'),
+    (5015, 1001, 3006, 5013, '/parent-208/child-002', '{"second-child-leaf": "second-child-leaf value"}'),
+    (5016, 1001, 3006, 5015, '/parent-208/child-002/grand-child', '{"grand-child-leaf": "grand-child-leaf value"}'),
+    (5017, 1001, 3006, null, '/parent-209', '{"parent-leaf-2": "parent-leaf value-2"}'),
+    (5018, 1001, 3006, 5017, '/parent-209/child-001', '{"first-child-leaf": "first-child-leaf value"}'),
+    (5019, 1001, 3006, 5017, '/parent-209/child-002', '{"second-child-leaf": "second-child-leaf value"}'),
+    (5020, 1001, 3006, 5019, '/parent-209/child-002/grand-child', '{"grand-child-leaf": "grand-child-leaf value"}');
+
+INSERT INTO FRAGMENT (ID, DATASPACE_ID, ANCHOR_ID, PARENT_ID, XPATH, ATTRIBUTES) VALUES
     (4201, 1001, 3003, null, '/parent-200', '{"leaf-value": "original"}'),
     (4202, 1001, 3003, 4201, '/parent-200/child-201', '{"leaf-value": "original"}'),
     (4203, 1001, 3003, 4202, '/parent-200/child-201/grand-child', '{"leaf-value": "original"}'),