CmHandle creation performance degradation

- Created a dedicated threadpool for scheduler.
- Tuned async threadpool of notification executor from setting RejectedExecutionHandler and application.yml.

Issue-ID: CPS-1126
Signed-off-by: sourabh_sourabh <sourabh.sourabh@est.tech>
Change-Id: I2afe3c76c1aec78751777df0d2f08ddb8dcee102

4 files changed, 77 insertions, 24 deletions

diff --git a/cps-ncmp-service/src/main/java/org/onap/cps/ncmp/api/impl/config/NcmpConfiguration.java b/cps-ncmp-service/src/main/java/org/onap/cps/ncmp/api/impl/config/NcmpConfiguration.java
index af33651eb..a41815554 100644
--- a/cps-ncmp-service/src/main/java/org/onap/cps/ncmp/api/impl/config/NcmpConfiguration.java
+++ b/cps-ncmp-service/src/main/java/org/onap/cps/ncmp/api/impl/config/NcmpConfiguration.java
@@ -32,11 +32,9 @@ import org.springframework.context.annotation.Configuration;
 import org.springframework.context.annotation.Scope;
 import org.springframework.http.MediaType;
 import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
-import org.springframework.scheduling.annotation.EnableScheduling;
 import org.springframework.stereotype.Component;
 import org.springframework.web.client.RestTemplate;
 
-@EnableScheduling
 @Configuration
 @RequiredArgsConstructor(access = AccessLevel.PROTECTED)
 public class NcmpConfiguration {
diff --git a/cps-ncmp-service/src/main/java/org/onap/cps/ncmp/api/inventory/sync/ModuleSyncWatchdog.java b/cps-ncmp-service/src/main/java/org/onap/cps/ncmp/api/inventory/sync/ModuleSyncWatchdog.java
index f18d843f8..3f81194fe 100644
--- a/cps-ncmp-service/src/main/java/org/onap/cps/ncmp/api/inventory/sync/ModuleSyncWatchdog.java
+++ b/cps-ncmp-service/src/main/java/org/onap/cps/ncmp/api/inventory/sync/ModuleSyncWatchdog.java
@@ -54,8 +54,7 @@ public class ModuleSyncWatchdog {
      */
     @Scheduled(fixedDelayString = "${timers.advised-modules-sync.sleep-time-ms:30000}")
     public void executeAdvisedCmHandlePoll() {
-        YangModelCmHandle advisedCmHandle = syncUtils.getAnAdvisedCmHandle();
-        while (advisedCmHandle != null) {
+        syncUtils.getAdvisedCmHandles().stream().forEach(advisedCmHandle -> {
             final String cmHandleId = advisedCmHandle.getId();
             final CompositeState compositeState = inventoryPersistence.getCmHandleState(cmHandleId);
             try {
@@ -69,8 +68,7 @@ public class ModuleSyncWatchdog {
             }
             inventoryPersistence.saveCmHandleState(cmHandleId, compositeState);
             log.debug("{} is now in {} state", cmHandleId, compositeState.getCmHandleState().name());
-            advisedCmHandle = syncUtils.getAnAdvisedCmHandle();
-        }
+        });
         log.debug("No Cm-Handles currently found in an ADVISED state");
     }
 
@@ -85,7 +83,7 @@ public class ModuleSyncWatchdog {
             final boolean isReadyForRetry = syncUtils.isReadyForRetry(compositeState);
             if (isReadyForRetry) {
                 setCompositeStateToAdvisedAndRetainOldLockReasonDetails(compositeState);
-                log.debug("Locked cm handle {} is being resynced", lockedCmHandle.getId());
+                log.debug("Locked cm handle {} is being re-synced", lockedCmHandle.getId());
                 inventoryPersistence.saveCmHandleState(lockedCmHandle.getId(), compositeState);
             }
         }
diff --git a/cps-ncmp-service/src/main/java/org/onap/cps/ncmp/api/inventory/sync/SyncUtils.java b/cps-ncmp-service/src/main/java/org/onap/cps/ncmp/api/inventory/sync/SyncUtils.java
index 2b80b9d53..467fd8f60 100644
--- a/cps-ncmp-service/src/main/java/org/onap/cps/ncmp/api/inventory/sync/SyncUtils.java
+++ b/cps-ncmp-service/src/main/java/org/onap/cps/ncmp/api/inventory/sync/SyncUtils.java
@@ -22,10 +22,10 @@
 package org.onap.cps.ncmp.api.inventory.sync;
 
 import com.fasterxml.jackson.databind.JsonNode;
-import java.security.SecureRandom;
 import java.time.Duration;
 import java.time.OffsetDateTime;
 import java.time.format.DateTimeFormatter;
+import java.util.ArrayList;
 import java.util.Collections;
 import java.util.Iterator;
 import java.util.List;
@@ -55,9 +55,6 @@ import org.springframework.stereotype.Service;
 @Service
 @RequiredArgsConstructor
 public class SyncUtils {
-
-    private static final SecureRandom secureRandom = new SecureRandom();
-
     private final InventoryPersistence inventoryPersistence;
 
     private final DmiDataOperations dmiDataOperations;
@@ -69,17 +66,17 @@ public class SyncUtils {
     /**
      * Query data nodes for cm handles with an "ADVISED" cm handle state, and select a random entry for processing.
      *
-     * @return a random yang model cm handle with an ADVISED state, return null if not found
+     * @return a randomized yang model cm handle list with ADVISED state, return empty list if not found
      */
-    public YangModelCmHandle getAnAdvisedCmHandle() {
-        final List<DataNode> advisedCmHandles = inventoryPersistence.getCmHandlesByState(CmHandleState.ADVISED);
-        if (advisedCmHandles.isEmpty()) {
-            return null;
+    public List<YangModelCmHandle> getAdvisedCmHandles() {
+        final List<DataNode> advisedCmHandlesAsDataNodeList = new ArrayList<>(
+                inventoryPersistence.getCmHandlesByState(CmHandleState.ADVISED));
+        log.info("Total number of fetched advised cm handle(s) is (are) {}", advisedCmHandlesAsDataNodeList.size());
+        if (advisedCmHandlesAsDataNodeList.isEmpty()) {
+            return Collections.emptyList();
         }
-        final int randomElementIndex = secureRandom.nextInt(advisedCmHandles.size());
-        final String cmHandleId = advisedCmHandles.get(randomElementIndex).getLeaves()
-            .get("id").toString();
-        return inventoryPersistence.getYangModelCmHandle(cmHandleId);
+        Collections.shuffle(advisedCmHandlesAsDataNodeList);
+        return convertCmHandlesDataNodesToYangModelCmHandles(advisedCmHandlesAsDataNodeList);
     }
 
     /**
@@ -113,12 +110,10 @@ public class SyncUtils {
      * @return a random LOCKED yang model cm handle, return null if not found
      */
     public List<YangModelCmHandle> getModuleSyncFailedCmHandles() {
-        final List<DataNode> lockedCmHandleAsDataNodeList = inventoryPersistence.getCmHandleDataNodesByCpsPath(
+        final List<DataNode> lockedCmHandlesAsDataNodeList = inventoryPersistence.getCmHandleDataNodesByCpsPath(
             "//lock-reason[@reason=\"LOCKED_MODULE_SYNC_FAILED\"]/ancestor::cm-handles",
             FetchDescendantsOption.INCLUDE_ALL_DESCENDANTS);
-        return lockedCmHandleAsDataNodeList.stream()
-            .map(cmHandle -> YangDataConverter.convertCmHandleToYangModel(cmHandle,
-                cmHandle.getLeaves().get("id").toString())).collect(Collectors.toList());
+        return convertCmHandlesDataNodesToYangModelCmHandles(lockedCmHandlesAsDataNodeList);
     }
 
     /**
@@ -191,4 +186,10 @@ public class SyncUtils {
         final Map.Entry<String, JsonNode> firstElement = overallJsonTreeMap.next();
         return jsonObjectMapper.asJsonString(Map.of(firstElement.getKey(), firstElement.getValue()));
     }
+
+    private List<YangModelCmHandle> convertCmHandlesDataNodesToYangModelCmHandles(
+            final List<DataNode> cmHandlesAsDataNodeList) {
+        return cmHandlesAsDataNodeList.stream().map(dataNode -> YangDataConverter.convertCmHandleToYangModel(dataNode,
+                dataNode.getLeaves().get("id").toString())).collect(Collectors.toList());
+    }
 }
diff --git a/cps-ncmp-service/src/main/java/org/onap/cps/ncmp/api/inventory/sync/config/WatchdogSchedulingConfigurer.java b/cps-ncmp-service/src/main/java/org/onap/cps/ncmp/api/inventory/sync/config/WatchdogSchedulingConfigurer.java
new file mode 100644
index 000000000..196a655ca
--- /dev/null
+++ b/cps-ncmp-service/src/main/java/org/onap/cps/ncmp/api/inventory/sync/config/WatchdogSchedulingConfigurer.java
@@ -0,0 +1,56 @@
+/*
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2022 Nordix Foundation
+ *  ================================================================================
+ *  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.
+ *
+ *  SPDX-License-Identifier: Apache-2.0
+ *  ============LICENSE_END=========================================================
+ */
+
+package org.onap.cps.ncmp.api.inventory.sync.config;
+
+import java.util.concurrent.ThreadPoolExecutor;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.scheduling.TaskScheduler;
+import org.springframework.scheduling.annotation.EnableScheduling;
+import org.springframework.scheduling.annotation.SchedulingConfigurer;
+import org.springframework.scheduling.concurrent.ThreadPoolTaskScheduler;
+import org.springframework.scheduling.config.ScheduledTaskRegistrar;
+
+@Configuration
+@EnableScheduling
+public class WatchdogSchedulingConfigurer implements SchedulingConfigurer {
+
+    @Override
+    public void configureTasks(final ScheduledTaskRegistrar scheduledTaskRegistrar) {
+        scheduledTaskRegistrar.setTaskScheduler(taskScheduler());
+    }
+
+    /**
+     * Implementation of Spring's {@link TaskScheduler} interface, wrapping
+     * a native {@link org.springframework.scheduling.concurrent.ThreadPoolTaskScheduler} for watchdogs.
+     */
+    @Bean
+    public TaskScheduler taskScheduler() {
+        final ThreadPoolTaskScheduler taskScheduler = new ThreadPoolTaskScheduler();
+        taskScheduler.setPoolSize(10);
+        taskScheduler.setThreadNamePrefix("watchdog-th-");
+        taskScheduler.setAwaitTerminationSeconds(60);
+        taskScheduler.setWaitForTasksToCompleteOnShutdown(true);
+        taskScheduler.setRejectedExecutionHandler(new ThreadPoolExecutor.DiscardPolicy());
+        taskScheduler.initialize();
+        return taskScheduler;
+    }
+}
\ No newline at end of file