Improve performance of updateDataLeaves

Avoid fetching descendants during batchUpdateDataLeaves,
as descendants are not needed:
- Remove prefetch descendants step from getFragmentEntities;
- Explicitly prefetch descendants in operations requiring it;
- Update performance tests (5x faster for batch update).

Issue-ID: CPS-1675
Signed-off-by: danielhanrahan <daniel.hanrahan@est.tech>
Change-Id: I7442a6f799cc0803b3a78f09d1ee53377f24b0b7

2 files changed, 13 insertions, 16 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 e6e250f082..7fed534b76 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
@@ -243,14 +243,14 @@ public class CpsDataPersistenceServiceImpl implements CpsDataPersistenceService
                                                               final Collection<String> xpaths,
                                                               final FetchDescendantsOption fetchDescendantsOption) {
         final AnchorEntity anchorEntity = getAnchorEntity(dataspaceName, anchorName);
-        final Collection<FragmentEntity> fragmentEntities =
-            getFragmentEntities(anchorEntity, xpaths, fetchDescendantsOption);
+        Collection<FragmentEntity> fragmentEntities = getFragmentEntities(anchorEntity, xpaths);
+        fragmentEntities = fragmentRepository.prefetchDescendantsOfFragmentEntities(fetchDescendantsOption,
+                fragmentEntities);
         return createDataNodesFromFragmentEntities(fetchDescendantsOption, fragmentEntities);
     }
 
     private Collection<FragmentEntity> getFragmentEntities(final AnchorEntity anchorEntity,
-                                                           final Collection<String> xpaths,
-                                                           final FetchDescendantsOption fetchDescendantsOption) {
+                                                           final Collection<String> xpaths) {
         final Collection<String> nonRootXpaths = new HashSet<>(xpaths);
         final boolean haveRootXpath = nonRootXpaths.removeIf(CpsDataPersistenceServiceImpl::isRootXpath);
 
@@ -266,10 +266,7 @@ public class CpsDataPersistenceServiceImpl implements CpsDataPersistenceService
             normalizedXpaths.addAll(fragmentRepository.findAllXpathByAnchorAndParentIdIsNull(anchorEntity));
         }
 
-        final List<FragmentEntity> fragmentEntities = fragmentRepository.findByAnchorAndXpathIn(anchorEntity,
-                normalizedXpaths);
-
-        return fragmentRepository.prefetchDescendantsOfFragmentEntities(fetchDescendantsOption, fragmentEntities);
+        return fragmentRepository.findByAnchorAndXpathIn(anchorEntity, normalizedXpaths);
     }
 
     private FragmentEntity getFragmentEntity(final AnchorEntity anchorEntity, final String xpath) {
@@ -407,8 +404,7 @@ public class CpsDataPersistenceServiceImpl implements CpsDataPersistenceService
         final AnchorEntity anchorEntity = getAnchorEntity(dataspaceName, anchorName);
 
         final Collection<String> xpathsOfUpdatedLeaves = updatedLeavesPerXPath.keySet();
-        final Collection<FragmentEntity> fragmentEntities = getFragmentEntities(anchorEntity, xpathsOfUpdatedLeaves,
-                FetchDescendantsOption.INCLUDE_ALL_DESCENDANTS);
+        final Collection<FragmentEntity> fragmentEntities = getFragmentEntities(anchorEntity, xpathsOfUpdatedLeaves);
 
         for (final FragmentEntity fragmentEntity : fragmentEntities) {
             final Map<String, Serializable> updatedLeaves = updatedLeavesPerXPath.get(fragmentEntity.getXpath());
@@ -432,8 +428,9 @@ public class CpsDataPersistenceServiceImpl implements CpsDataPersistenceService
             .collect(Collectors.toMap(DataNode::getXpath, dataNode -> dataNode));
 
         final Collection<String> xpaths = xpathToUpdatedDataNode.keySet();
-        final Collection<FragmentEntity> existingFragmentEntities =
-            getFragmentEntities(anchorEntity, xpaths, FetchDescendantsOption.INCLUDE_ALL_DESCENDANTS);
+        Collection<FragmentEntity> existingFragmentEntities = getFragmentEntities(anchorEntity, xpaths);
+        existingFragmentEntities = fragmentRepository.prefetchDescendantsOfFragmentEntities(
+                FetchDescendantsOption.INCLUDE_ALL_DESCENDANTS, existingFragmentEntities);
 
         for (final FragmentEntity existingFragmentEntity : existingFragmentEntities) {
             final DataNode updatedDataNode = xpathToUpdatedDataNode.get(existingFragmentEntity.getXpath());
diff --git a/integration-test/src/test/groovy/org/onap/cps/integration/performance/cps/UpdatePerfTest.groovy b/integration-test/src/test/groovy/org/onap/cps/integration/performance/cps/UpdatePerfTest.groovy
index b3c8841270..6d856cc881 100644
--- a/integration-test/src/test/groovy/org/onap/cps/integration/performance/cps/UpdatePerfTest.groovy
+++ b/integration-test/src/test/groovy/org/onap/cps/integration/performance/cps/UpdatePerfTest.groovy
@@ -70,8 +70,8 @@ class UpdatePerfTest extends CpsPerfTestBase {
             objectUnderTest.updateNodeLeaves(CPS_PERFORMANCE_TEST_DATASPACE, 'openroadm3', "/openroadm-devices", jsonDataOriginal, now)
             stopWatch.stop()
             def updateDurationInMillis = stopWatch.getTotalTimeMillis()
-        then: 'update duration is under 750 milliseconds'
-            recordAndAssertPerformance('Update leaves for 1 data node', 750, updateDurationInMillis)
+        then: 'update duration is under 650 milliseconds'
+            recordAndAssertPerformance('Update leaves for 1 data node', 650, updateDurationInMillis)
     }
 
     def 'Batch update leaves for 50 data nodes'() {
@@ -84,8 +84,8 @@ class UpdatePerfTest extends CpsPerfTestBase {
             objectUnderTest.updateNodeLeaves(CPS_PERFORMANCE_TEST_DATASPACE, 'openroadm4', "/openroadm-devices", jsonDataOriginal, now)
             stopWatch.stop()
             def updateDurationInMillis = stopWatch.getTotalTimeMillis()
-        then: 'update duration is under 3500 milliseconds'
-            recordAndAssertPerformance('Batch update leaves for 50 data nodes', 3500, updateDurationInMillis)
+        then: 'update duration is under 700 milliseconds'
+            recordAndAssertPerformance('Batch update leaves for 50 data nodes', 700, updateDurationInMillis)
     }
 
 }