ONOS-4590 - This has been noticed also in ONOS-3633 - Fixing an issue with intents.

Pending intents were not being removed from the Gossip intent store as the
intentData object did not match what was stored during the remove.
General cause: intent resubmission loops when installation time exceeds cleanup
polling interval

Change-Id: Id50baade9807c102b7cbff9a4667e048f57698bb

@@ -16,7 +16,6 @@
 package org.onosproject.store.intent.impl;
 
 import com.google.common.collect.ImmutableList;
-
 import org.apache.commons.lang.math.RandomUtils;
 import org.apache.felix.scr.annotations.Activate;
 import org.apache.felix.scr.annotations.Component;
@@ -31,19 +30,19 @@ import org.onosproject.cluster.NodeId;
 import org.onosproject.net.intent.Intent;
 import org.onosproject.net.intent.IntentData;
 import org.onosproject.net.intent.IntentEvent;
+import org.onosproject.net.intent.IntentPartitionService;
 import org.onosproject.net.intent.IntentState;
 import org.onosproject.net.intent.IntentStore;
 import org.onosproject.net.intent.IntentStoreDelegate;
 import org.onosproject.net.intent.Key;
-import org.onosproject.net.intent.IntentPartitionService;
 import org.onosproject.store.AbstractStore;
-import org.onosproject.store.service.MultiValuedTimestamp;
-import org.onosproject.store.service.WallClockTimestamp;
 import org.onosproject.store.serializers.KryoNamespaces;
 import org.onosproject.store.service.EventuallyConsistentMap;
 import org.onosproject.store.service.EventuallyConsistentMapEvent;
 import org.onosproject.store.service.EventuallyConsistentMapListener;
+import org.onosproject.store.service.MultiValuedTimestamp;
 import org.onosproject.store.service.StorageService;
+import org.onosproject.store.service.WallClockTimestamp;
 import org.slf4j.Logger;
 
 import java.util.Collection;
@@ -91,7 +90,6 @@ public class GossipIntentStore
     public void activate() {
         KryoNamespace.Builder intentSerializer = KryoNamespace.newBuilder()
                 .register(KryoNamespaces.API)
-                .nextId(KryoNamespaces.BEGIN_USER_CUSTOM_ID)
                 .register(IntentData.class)
                 .register(MultiValuedTimestamp.class);
 
@@ -107,8 +105,9 @@ public class GossipIntentStore
         pendingMap = storageService.<Key, IntentData>eventuallyConsistentMapBuilder()
                 .withName("intent-pending")
                 .withSerializer(intentSerializer)
-                .withTimestampProvider((key, intentData) -> new MultiValuedTimestamp<>(intentData.version(),
-                                                                                       System.nanoTime()))
+                .withTimestampProvider((key, intentData) -> intentData == null ?
+                        new MultiValuedTimestamp<>(new WallClockTimestamp(), System.nanoTime()) :
+                        new MultiValuedTimestamp<>(intentData.version(), System.nanoTime()))
                 .withPeerUpdateFunction((key, intentData) -> getPeerNodes(key, intentData))
                 .build();
 
@@ -183,8 +182,15 @@ public class GossipIntentStore
                 currentMap.put(newData.key(), new IntentData(newData));
             }
 
-            // if current.put succeeded
-            pendingMap.remove(newData.key(), newData);
+            // Remove the intent data from the pending map if the newData is more
+            // recent or equal to the existing entry.
+            pendingMap.compute(newData.key(), (key, existingValue) -> {
+                if (existingValue == null || !existingValue.version().isNewerThan(newData.version())) {
+                    return null;
+                } else {
+                    return existingValue;
+                }
+            });
         }
     }