Add retry mechanism on Subscription loader

Issue-ID: CPS-1568
Signed-off-by: emaclee <lee.anjella.macabuhay@est.tech>
Change-Id: I35697c260cc1a774f50d12552996b39f812fc2de

1 files changed, 31 insertions, 0 deletions

diff --git a/cps-ncmp-service/src/main/java/org/onap/cps/ncmp/init/SubscriptionModelLoader.java b/cps-ncmp-service/src/main/java/org/onap/cps/ncmp/init/SubscriptionModelLoader.java
index 231ba75b5d..5a418fd312 100644
--- a/cps-ncmp-service/src/main/java/org/onap/cps/ncmp/init/SubscriptionModelLoader.java
+++ b/cps-ncmp-service/src/main/java/org/onap/cps/ncmp/init/SubscriptionModelLoader.java
@@ -31,6 +31,7 @@ import org.onap.cps.api.CpsDataService;
 import org.onap.cps.api.CpsModuleService;
 import org.onap.cps.ncmp.api.impl.exception.NcmpStartUpException;
 import org.onap.cps.spi.exceptions.AlreadyDefinedException;
+import org.onap.cps.spi.model.Dataspace;
 import org.springframework.beans.factory.annotation.Value;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.context.event.ApplicationReadyEvent;
@@ -51,6 +52,12 @@ public class SubscriptionModelLoader implements ModelLoader {
     private static final String SUBSCRIPTION_SCHEMASET_NAME = "subscriptions";
     private static final String SUBSCRIPTION_REGISTRY_DATANODE_NAME = "subscription-registry";
 
+    @Value("${ncmp.model-loader.maximumAttemptCount:20}")
+    private int maximumAttemptCount;
+
+    @Value("${ncmp.model-loader.retryTimeMs:1000}")
+    private long retryTimeMs;
+
     @Value("${ncmp.model-loader.subscription:false}")
     private boolean subscriptionModelLoaderEnabled;
 
@@ -63,6 +70,7 @@ public class SubscriptionModelLoader implements ModelLoader {
     public void onApplicationEvent(final ApplicationReadyEvent applicationReadyEvent) {
         try {
             if (subscriptionModelLoaderEnabled) {
+                checkNcmpDataspaceExists();
                 onboardSubscriptionModel(createYangResourceToContentMap());
             } else {
                 log.info("Subscription Model Loader is disabled");
@@ -73,6 +81,29 @@ public class SubscriptionModelLoader implements ModelLoader {
         }
     }
 
+    private void checkNcmpDataspaceExists() {
+        boolean ncmpDataspaceExists = false;
+        int attemptCount = 0;
+        while (!ncmpDataspaceExists) {
+            final Dataspace ncmpDataspace = cpsAdminService.getDataspace(SUBSCRIPTION_DATASPACE_NAME);
+            if (ncmpDataspace != null) {
+                ncmpDataspaceExists = true;
+            }
+            if (attemptCount < maximumAttemptCount) {
+                try {
+                    Thread.sleep(attemptCount * retryTimeMs);
+                    attemptCount++;
+                    log.info("Retrieving NCMP dataspace... {} attempt(s) ", attemptCount);
+                } catch (final InterruptedException e) {
+                    Thread.currentThread().interrupt();
+                }
+            } else {
+                throw new NcmpStartUpException("Retrieval of NCMP dataspace fails",
+                        "NCMP dataspace does not exist");
+            }
+        }
+    }
+
     /**
      * Method to onboard subscription model for NCMP.
      */