Cm Subscription: Remove subscription method

	- method to remove a subscription Id from leaflist
	- condition if subscription list is empty, remove subscription
	  all together

Issue-ID: CPS-2164
Change-Id: Id694f441f9675fa9a048e3b824e1f02fae73f87e
Signed-off-by: emaclee <lee.anjella.macabuhay@est.tech>

3 files changed, 115 insertions, 45 deletions

diff --git a/cps-ncmp-service/src/main/java/org/onap/cps/ncmp/api/impl/events/cmsubscription/service/CmNotificationSubscriptionPersistenceService.java b/cps-ncmp-service/src/main/java/org/onap/cps/ncmp/api/impl/events/cmsubscription/service/CmNotificationSubscriptionPersistenceService.java
index 6b02adb654..3bb40c3b7e 100644
--- a/cps-ncmp-service/src/main/java/org/onap/cps/ncmp/api/impl/events/cmsubscription/service/CmNotificationSubscriptionPersistenceService.java
+++ b/cps-ncmp-service/src/main/java/org/onap/cps/ncmp/api/impl/events/cmsubscription/service/CmNotificationSubscriptionPersistenceService.java
@@ -31,9 +31,9 @@ public interface CmNotificationSubscriptionPersistenceService {
     /**
      * Check if we have an ongoing cm subscription based on the parameters.
      *
-     * @param datastoreType valid datastore type
-     * @param cmHandleId    cmhandle id
-     * @param xpath         valid xpath
+     * @param datastoreType the susbcription target datastore type
+     * @param cmHandleId the id of the cm handle for the susbcription
+     * @param xpath the target xpath
      * @return true for ongoing cmsubscription , otherwise false
      */
     boolean isOngoingCmNotificationSubscription(final DatastoreType datastoreType, final String cmHandleId,
@@ -50,22 +50,35 @@ public interface CmNotificationSubscriptionPersistenceService {
     /**
      * Get all ongoing cm notification subscription based on the parameters.
      *
-     * @param datastoreType valid datastore type
-     * @param cmHandleId    cmhandle id
-     * @param xpath         valid xpath
+     * @param datastoreType the susbcription target datastore type
+     * @param cmHandleId the id of the cm handle for the susbcription
+     * @param xpath the target xpath
      * @return collection of subscription ids of ongoing cm notification subscription
      */
     Collection<String> getOngoingCmNotificationSubscriptionIds(final DatastoreType datastoreType,
             final String cmHandleId, final String xpath);
 
     /**
-     * Add or update cm notification subscription.
+     * Add cm notification subscription.
      *
-     * @param datastoreType valid datastore type
-     * @param cmHandle cmhandle id
-     * @param xpath valid xpath
-     * @param newSubscriptionId subscription Id to be added
+     * @param datastoreType the susbcription target datastore type
+     * @param cmHandleId the id of the cm handle for the susbcription
+     * @param xpath the target xpath
+     * @param newSubscriptionId subscription id to be added
      */
-    void addOrUpdateCmNotificationSubscription(final DatastoreType datastoreType, final String cmHandle,
-                                               final String xpath, final String newSubscriptionId);
+    void addCmNotificationSubscription(final DatastoreType datastoreType, final String cmHandleId,
+                                       final String xpath, final String newSubscriptionId);
+
+    /**
+     * Remove cm notification Subscription.
+     *
+     * @param datastoreType the susbcription target datastore type
+     * @param cmHandleId the id of the cm handle for the susbcription
+     * @param xpath the target xpath
+     * @param subscriptionId subscription id to remove
+     */
+    void removeCmNotificationSubscription(final DatastoreType datastoreType, final String cmHandleId,
+                                          final String xpath, final String subscriptionId);
+
 }
+
diff --git a/cps-ncmp-service/src/main/java/org/onap/cps/ncmp/api/impl/events/cmsubscription/service/CmNotificationSubscriptionPersistenceServiceImpl.java b/cps-ncmp-service/src/main/java/org/onap/cps/ncmp/api/impl/events/cmsubscription/service/CmNotificationSubscriptionPersistenceServiceImpl.java
index 2efd321b8d..92f3459187 100644
--- a/cps-ncmp-service/src/main/java/org/onap/cps/ncmp/api/impl/events/cmsubscription/service/CmNotificationSubscriptionPersistenceServiceImpl.java
+++ b/cps-ncmp-service/src/main/java/org/onap/cps/ncmp/api/impl/events/cmsubscription/service/CmNotificationSubscriptionPersistenceServiceImpl.java
@@ -24,7 +24,6 @@ import static org.onap.cps.spi.FetchDescendantsOption.OMIT_DESCENDANTS;
 
 import java.io.Serializable;
 import java.time.OffsetDateTime;
-import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.HashMap;
@@ -60,7 +59,7 @@ public class CmNotificationSubscriptionPersistenceServiceImpl implements CmNotif
 
     @Override
     public boolean isOngoingCmNotificationSubscription(final DatastoreType datastoreType, final String cmHandleId,
-            final String xpath) {
+                                                       final String xpath) {
         return !getOngoingCmNotificationSubscriptionIds(datastoreType, cmHandleId, xpath).isEmpty();
     }
 
@@ -73,7 +72,7 @@ public class CmNotificationSubscriptionPersistenceServiceImpl implements CmNotif
 
     @Override
     public Collection<String> getOngoingCmNotificationSubscriptionIds(final DatastoreType datastoreType,
-            final String cmHandleId, final String xpath) {
+                                                                      final String cmHandleId, final String xpath) {
 
         final String isOngoingCmSubscriptionCpsPathQuery =
                 CM_SUBSCRIPTION_CPS_PATH_QUERY.formatted(datastoreType.getDatastoreName(), cmHandleId,
@@ -88,45 +87,77 @@ public class CmNotificationSubscriptionPersistenceServiceImpl implements CmNotif
     }
 
     @Override
-    public void addOrUpdateCmNotificationSubscription(final DatastoreType datastoreType, final String cmHandleId,
-                                                      final String xpath, final String newSubscriptionId) {
-        if (isOngoingCmNotificationSubscription(datastoreType, cmHandleId, xpath)) {
-            final DataNode existingFilterNode =
-                    cpsQueryService.queryDataNodes(NCMP_DATASPACE_NAME, SUBSCRIPTION_ANCHOR_NAME,
-                            CM_SUBSCRIPTION_CPS_PATH_QUERY.formatted(datastoreType.getDatastoreName(), cmHandleId,
-                                    escapeQuotesByDoublingThem(xpath)),
-                            OMIT_DESCENDANTS).iterator().next();
-            final Collection<String> existingSubscriptionIds = getOngoingCmNotificationSubscriptionIds(datastoreType,
+    public void addCmNotificationSubscription(final DatastoreType datastoreType, final String cmHandleId,
+                                              final String xpath, final String subscriptionId) {
+        if (isOngoingCmNotificationSubscription(datastoreType, cmHandleId, xpath)
+                && (!getOngoingCmNotificationSubscriptionIds(datastoreType, cmHandleId, xpath)
+                .contains(subscriptionId))) {
+            final DataNode subscriptionAsDataNode = getSubscriptionAsDataNode(datastoreType, cmHandleId, xpath);
+            final Collection<String> subscriptionIds = getOngoingCmNotificationSubscriptionIds(datastoreType,
                     cmHandleId, xpath);
-            if (!existingSubscriptionIds.contains(newSubscriptionId)) {
-                updateListOfSubscribers(existingSubscriptionIds, newSubscriptionId, existingFilterNode);
-            }
+            subscriptionIds.add(subscriptionId);
+            saveSubscriptionDetails(subscriptionAsDataNode, subscriptionIds);
+        } else {
+            addNewSubscriptionViaDatastore(datastoreType, cmHandleId, xpath, subscriptionId);
+        }
+    }
+
+    @Override
+    public void removeCmNotificationSubscription(final DatastoreType datastoreType, final String cmHandleId,
+                                                 final String xpath, final String subscriptionId) {
+        final DataNode subscriptionAsDataNode = getSubscriptionAsDataNode(datastoreType, cmHandleId, xpath);
+        final Collection<String> subscriptionIds = getOngoingCmNotificationSubscriptionIds(datastoreType,
+                cmHandleId, xpath);
+        subscriptionIds.remove(subscriptionId);
+        saveSubscriptionDetails(subscriptionAsDataNode, subscriptionIds);
+        if (isOngoingCmNotificationSubscription(datastoreType, cmHandleId, xpath)) {
+            log.info("There are subscribers left for the following cps path {} :",
+                    CM_SUBSCRIPTION_CPS_PATH_QUERY.formatted(datastoreType.getDatastoreName(), cmHandleId,
+                            escapeQuotesByDoublingThem(xpath)));
         } else {
-            addNewSubscriptionViaDatastore(datastoreType, cmHandleId, xpath, newSubscriptionId);
+            log.info("No subscribers left for the following cps path {} :",
+                    CM_SUBSCRIPTION_CPS_PATH_QUERY.formatted(datastoreType.getDatastoreName(), cmHandleId,
+                            escapeQuotesByDoublingThem(xpath)));
+            deleteListOfSubscriptionsFor(datastoreType, cmHandleId, xpath);
         }
     }
 
+    private void deleteListOfSubscriptionsFor(final DatastoreType datastoreType, final String cmHandleId,
+                                              final String xpath) {
+        cpsDataService.deleteDataNode(NCMP_DATASPACE_NAME, SUBSCRIPTION_ANCHOR_NAME,
+                CM_SUBSCRIPTION_CPS_PATH_QUERY.formatted(datastoreType.getDatastoreName(), cmHandleId,
+                        escapeQuotesByDoublingThem(xpath)),
+                OffsetDateTime.now());
+    }
+
+    private DataNode getSubscriptionAsDataNode(final DatastoreType datastoreType, final String cmHandleId,
+                                               final String xpath) {
+        return cpsQueryService.queryDataNodes(NCMP_DATASPACE_NAME, SUBSCRIPTION_ANCHOR_NAME,
+                CM_SUBSCRIPTION_CPS_PATH_QUERY.formatted(datastoreType.getDatastoreName(), cmHandleId,
+                        escapeQuotesByDoublingThem(xpath)),
+                OMIT_DESCENDANTS).iterator().next();
+    }
+
     private void addNewSubscriptionViaDatastore(final DatastoreType datastoreType, final String cmHandleId,
                                                 final String xpath, final String newSubscriptionId) {
         final String parentXpath = "/datastores/datastore[@name='%s']/cm-handles"
                 .formatted(datastoreType.getDatastoreName());
-        final String updatedJson = String.format("{\"cm-handle\":[{\"id\":\"%s\",\"filters\":{\"filter\":"
+        final String subscriptionAsJson = String.format("{\"cm-handle\":[{\"id\":\"%s\",\"filters\":{\"filter\":"
                 + "[{\"xpath\":\"%s\",\"subscriptionIds\":[\"%s\"]}]}}]}", cmHandleId, xpath, newSubscriptionId);
-        cpsDataService.saveData(NCMP_DATASPACE_NAME, SUBSCRIPTION_ANCHOR_NAME, parentXpath, updatedJson,
+        cpsDataService.saveData(NCMP_DATASPACE_NAME, SUBSCRIPTION_ANCHOR_NAME, parentXpath, subscriptionAsJson,
                 OffsetDateTime.now(), ContentType.JSON);
     }
 
-    private void updateListOfSubscribers(final Collection<String> existingSubscriptionIds,
-                                         final String newSubscriptionId, final DataNode existingFilterNode) {
-        final String parentXpath = CpsPathUtil.getNormalizedParentXpath(existingFilterNode.getXpath());
-        final List<String> updatedSubscribers = new ArrayList<>(existingSubscriptionIds);
-        updatedSubscribers.add(newSubscriptionId);
-        final Map<String, Serializable> updatedLeaves = new HashMap<>();
-        updatedLeaves.put("xpath", existingFilterNode.getLeaves().get("xpath"));
-        updatedLeaves.put("subscriptionIds", (Serializable) updatedSubscribers);
-        final String updatedJson = "{\"filter\":[" + jsonObjectMapper.asJsonString(updatedLeaves) + "]}";
-        cpsDataService.updateNodeLeaves(NCMP_DATASPACE_NAME, SUBSCRIPTION_ANCHOR_NAME, parentXpath, updatedJson,
-                OffsetDateTime.now());
+    private void saveSubscriptionDetails(final DataNode subscriptionDetailsAsDataNode,
+                                         final  Collection<String> subscriptionIds) {
+        final Map<String, Serializable> subscriptionDetailsAsMap = new HashMap<>();
+        subscriptionDetailsAsMap.put("xpath", subscriptionDetailsAsDataNode.getLeaves().get("xpath"));
+        subscriptionDetailsAsMap.put("subscriptionIds", (Serializable) subscriptionIds);
+        final String parentXpath = CpsPathUtil.getNormalizedParentXpath(subscriptionDetailsAsDataNode.getXpath());
+        final String subscriptionDetailsAsJson = "{\"filter\":["
+                + jsonObjectMapper.asJsonString(subscriptionDetailsAsMap).replace("'", "\"") + "]}";
+        cpsDataService.updateNodeLeaves(NCMP_DATASPACE_NAME, SUBSCRIPTION_ANCHOR_NAME, parentXpath,
+                subscriptionDetailsAsJson, OffsetDateTime.now());
     }
 
     private static String escapeQuotesByDoublingThem(final String inputXpath) {
diff --git a/cps-ncmp-service/src/test/groovy/org/onap/cps/ncmp/api/impl/events/cmsubscription/service/CmNotificationSubscriptionPersistenceServiceImplSpec.groovy b/cps-ncmp-service/src/test/groovy/org/onap/cps/ncmp/api/impl/events/cmsubscription/service/CmNotificationSubscriptionPersistenceServiceImplSpec.groovy
index 19ebc3d711..13a20a1eb2 100644
--- a/cps-ncmp-service/src/test/groovy/org/onap/cps/ncmp/api/impl/events/cmsubscription/service/CmNotificationSubscriptionPersistenceServiceImplSpec.groovy
+++ b/cps-ncmp-service/src/test/groovy/org/onap/cps/ncmp/api/impl/events/cmsubscription/service/CmNotificationSubscriptionPersistenceServiceImplSpec.groovy
@@ -71,12 +71,12 @@ class CmNotificationSubscriptionPersistenceServiceImplSpec extends Specification
 
     def 'Add new subscriber to an ongoing cm notification subscription'() {
         given: 'a valid cm subscription path query'
-            def cpsPathQuery = objectUnderTest.CM_SUBSCRIPTION_CPS_PATH_QUERY.formatted('ncmp-datastore:passthrough-running', 'ch-1', '/x/y');
+            def cpsPathQuery = objectUnderTest.CM_SUBSCRIPTION_CPS_PATH_QUERY.formatted('ncmp-datastore:passthrough-running', 'ch-1', '/x/y')
         and: 'a dataNode exists for the given cps path query'
              mockCpsQueryService.queryDataNodes('NCMP-Admin', 'cm-data-subscriptions',
                 cpsPathQuery, FetchDescendantsOption.OMIT_DESCENDANTS) >> [new DataNode(xpath: cpsPathQuery, leaves: ['xpath': '/x/y','subscriptionIds': ['sub-1']])]
         when: 'the method to add/update cm notification subscription is called'
-            objectUnderTest.addOrUpdateCmNotificationSubscription(DatastoreType.PASSTHROUGH_RUNNING, 'ch-1','/x/y', 'newSubId')
+            objectUnderTest.addCmNotificationSubscription(DatastoreType.PASSTHROUGH_RUNNING, 'ch-1','/x/y', 'newSubId')
         then: 'data service method to update list of subscribers is called once'
             1 * mockCpsDataService.updateNodeLeaves(
                 'NCMP-Admin',
@@ -95,7 +95,7 @@ class CmNotificationSubscriptionPersistenceServiceImplSpec extends Specification
                 cpsPathQuery.formatted(datastoreName),
                 FetchDescendantsOption.OMIT_DESCENDANTS) >> []
         when: 'the method to add/update cm notification subscription is called'
-            objectUnderTest.addOrUpdateCmNotificationSubscription(datastoreType, 'ch-1','/x/y', 'newSubId')
+            objectUnderTest.addCmNotificationSubscription(datastoreType, 'ch-1','/x/y', 'newSubId')
         then: 'data service method to update list of subscribers is called once with the correct parameters'
             1 * mockCpsDataService.saveData(
                 'NCMP-Admin',
@@ -107,4 +107,30 @@ class CmNotificationSubscriptionPersistenceServiceImplSpec extends Specification
             'passthrough_running'     | DatastoreType.PASSTHROUGH_RUNNING      || "ncmp-datastore:passthrough-running"
             'passthrough_operational' | DatastoreType.PASSTHROUGH_OPERATIONAL  || "ncmp-datastore:passthrough-operational"
     }
+
+    def 'Remove subscriber from a list of an ongoing cm notification subscription'() {
+        given: 'a subscription exists when queried'
+            def cpsPathQuery = objectUnderTest.CM_SUBSCRIPTION_CPS_PATH_QUERY.formatted('ncmp-datastore:passthrough-running', 'ch-1', '/x/y')
+            mockCpsQueryService.queryDataNodes('NCMP-Admin', 'cm-data-subscriptions',
+                cpsPathQuery, FetchDescendantsOption.OMIT_DESCENDANTS) >> [new DataNode(xpath: cpsPathQuery, leaves: ['xpath': '/x/y','subscriptionIds': ['sub-1', 'sub-2']])]
+        when: 'the subscriber is removed'
+            objectUnderTest.removeCmNotificationSubscription(DatastoreType.PASSTHROUGH_RUNNING, 'ch-1', '/x/y', 'sub-1')
+        then: 'the list of subscribers is updated'
+            1 * mockCpsDataService.updateNodeLeaves('NCMP-Admin', 'cm-data-subscriptions',
+                '/datastores/datastore[@name=\'ncmp-datastore:passthrough-running\']/cm-handles/cm-handle[@id=\'ch-1\']/filters',
+                '{"filter":[{"xpath":"/x/y","subscriptionIds":["sub-2"]}]}', _)
+    }
+
+    def 'Removing ongoing subscription with no subscribers'(){
+        given: 'a subscription exists when queried but has no subscribers'
+            def cpsPathQuery = objectUnderTest.CM_SUBSCRIPTION_CPS_PATH_QUERY.formatted('ncmp-datastore:passthrough-running', 'ch-1', '/x/y')
+            mockCpsQueryService.queryDataNodes('NCMP-Admin', 'cm-data-subscriptions',
+                cpsPathQuery, FetchDescendantsOption.OMIT_DESCENDANTS) >> [new DataNode(xpath: cpsPathQuery, leaves: ['xpath': '/x/y','subscriptionIds': []])]
+        when: 'a an ongoing subscription is refreshed'
+            objectUnderTest.removeCmNotificationSubscription(DatastoreType.PASSTHROUGH_RUNNING, 'ch-1', '/x/y', 'sub-1')
+        then: 'the subscription with empty subscriber list is removed'
+            1 * mockCpsDataService.deleteDataNode('NCMP-Admin', 'cm-data-subscriptions',
+                '/datastores/datastore[@name=\'ncmp-datastore:passthrough-running\']/cm-handles/cm-handle[@id=\'ch-1\']/filters/filter[@xpath=\'/x/y\']',
+                _)
+    }
 }
\ No newline at end of file