Intents are now removed after being withdrawn.

Change-Id: I7574fe94add00abf58c71c6122bb3dc5aafa0f79
diff --git a/core/api/src/main/java/org/onlab/onos/net/intent/IntentStore.java b/core/api/src/main/java/org/onlab/onos/net/intent/IntentStore.java
index a2248a2..3af59c1 100644
--- a/core/api/src/main/java/org/onlab/onos/net/intent/IntentStore.java
+++ b/core/api/src/main/java/org/onlab/onos/net/intent/IntentStore.java
@@ -42,9 +42,8 @@
      * Removes the specified intent from the inventory.
      *
      * @param intentId intent identification
-     * @return removed state transition event or null if intent was not found
      */
-    IntentEvent removeIntent(IntentId intentId);
+    void removeIntent(IntentId intentId);
 
     /**
      * Returns the number of intents in the store.
@@ -103,8 +102,6 @@
      */
     List<Intent> getInstallableIntents(IntentId intentId);
 
-    // TODO: this should be triggered from with the store as a result of removeIntent call
-
     /**
      * Removes any installable intents which resulted from compilation of the
      * specified original intent.
diff --git a/core/net/src/main/java/org/onlab/onos/net/intent/impl/IntentManager.java b/core/net/src/main/java/org/onlab/onos/net/intent/impl/IntentManager.java
index fb6aa40..da2fe70 100644
--- a/core/net/src/main/java/org/onlab/onos/net/intent/impl/IntentManager.java
+++ b/core/net/src/main/java/org/onlab/onos/net/intent/impl/IntentManager.java
@@ -694,6 +694,10 @@
             if (event != null) {
                 eventDispatcher.post(event);
             }
+
+            if (newState == WITHDRAWN) {
+                store.removeIntent(intent.id());
+            }
         }
 
         Map<Intent, IntentState> stateMap() {
diff --git a/core/net/src/test/java/org/onlab/onos/net/intent/impl/IntentManagerTest.java b/core/net/src/test/java/org/onlab/onos/net/intent/impl/IntentManagerTest.java
index dc7383b..20240d4 100644
--- a/core/net/src/test/java/org/onlab/onos/net/intent/impl/IntentManagerTest.java
+++ b/core/net/src/test/java/org/onlab/onos/net/intent/impl/IntentManagerTest.java
@@ -155,7 +155,8 @@
         listener.setLatch(1, Type.WITHDRAWN);
         service.withdraw(intent);
         listener.await(Type.WITHDRAWN);
-        assertEquals(1L, service.getIntentCount());
+        delay(10); //FIXME this is a race
+        assertEquals(0L, service.getIntentCount());
         assertEquals(0L, flowRuleService.getFlowRuleCount());
     }
 
@@ -176,7 +177,8 @@
 
         listener.await(Type.INSTALLED);
         listener.await(Type.WITHDRAWN);
-        assertEquals(1L, service.getIntentCount());
+        delay(10); //FIXME this is a race
+        assertEquals(0L, service.getIntentCount());
         assertEquals(0L, flowRuleService.getFlowRuleCount());
     }
 
@@ -198,7 +200,8 @@
         service.replace(intent.id(), intent2);
         listener.await(Type.WITHDRAWN);
         listener.await(Type.INSTALLED);
-        assertEquals(2L, service.getIntentCount());
+        delay(10); //FIXME this is a race
+        assertEquals(1L, service.getIntentCount());
         assertEquals(1L, manager.flowRuleService.getFlowRuleCount());
         assertEquals(intent2.number().intValue(),
                      flowRuleService.flows.iterator().next().priority());
diff --git a/core/store/dist/src/main/java/org/onlab/onos/store/intent/impl/DistributedIntentStore.java b/core/store/dist/src/main/java/org/onlab/onos/store/intent/impl/DistributedIntentStore.java
index 5974b62..8da72cf 100644
--- a/core/store/dist/src/main/java/org/onlab/onos/store/intent/impl/DistributedIntentStore.java
+++ b/core/store/dist/src/main/java/org/onlab/onos/store/intent/impl/DistributedIntentStore.java
@@ -50,6 +50,7 @@
 import java.util.Set;
 import java.util.concurrent.ConcurrentHashMap;
 
+import static com.google.common.base.Preconditions.checkState;
 import static org.onlab.onos.net.intent.IntentState.*;
 import static org.slf4j.LoggerFactory.getLogger;
 import static org.onlab.metrics.MetricsUtil.*;
@@ -174,20 +175,15 @@
     }
 
     @Override
-    public IntentEvent removeIntent(IntentId intentId) {
+    public void removeIntent(IntentId intentId) {
         Context timer = startTimer(removeIntentTimer);
+        checkState(getIntentState(intentId) == WITHDRAWN,
+                   "Intent state for {} is not WITHDRAWN.", intentId);
         try {
-            Intent intent = intents.remove(intentId);
-            installable.remove(intentId);
-            if (intent == null) {
-                // was already removed
-                return null;
-            }
-            IntentEvent event = this.setState(intent, WITHDRAWN);
+            intents.remove(intentId);
             states.remove(intentId);
             transientStates.remove(intentId);
-            // TODO: Should we callremoveInstalledIntents if this Intent was
-            return event;
+            installable.remove(intentId);
         } finally {
             stopTimer(timer);
         }
diff --git a/core/store/dist/src/main/java/org/onlab/onos/store/intent/impl/HazelcastIntentStore.java b/core/store/dist/src/main/java/org/onlab/onos/store/intent/impl/HazelcastIntentStore.java
index 001ab7e..29bf15f 100644
--- a/core/store/dist/src/main/java/org/onlab/onos/store/intent/impl/HazelcastIntentStore.java
+++ b/core/store/dist/src/main/java/org/onlab/onos/store/intent/impl/HazelcastIntentStore.java
@@ -52,6 +52,7 @@
 import java.util.Set;
 import java.util.concurrent.ConcurrentHashMap;
 
+import static com.google.common.base.Preconditions.checkState;
 import static org.onlab.onos.net.intent.IntentState.*;
 import static org.slf4j.LoggerFactory.getLogger;
 import static org.onlab.metrics.MetricsUtil.*;
@@ -177,20 +178,15 @@
     }
 
     @Override
-    public IntentEvent removeIntent(IntentId intentId) {
+    public void removeIntent(IntentId intentId) {
         Context timer = startTimer(removeIntentTimer);
+        checkState(getIntentState(intentId) == WITHDRAWN,
+                   "Intent state for {} is not WITHDRAWN.", intentId);
         try {
-            Intent intent = intents.remove(intentId);
+            intents.remove(intentId);
             installable.remove(intentId);
-            if (intent == null) {
-                // was already removed
-                return null;
-            }
-            IntentEvent event = this.setState(intent, WITHDRAWN);
             states.remove(intentId);
             transientStates.remove(intentId);
-            // TODO: Should we callremoveInstalledIntents if this Intent was
-            return event;
         } finally {
             stopTimer(timer);
         }
diff --git a/core/store/trivial/src/main/java/org/onlab/onos/store/trivial/impl/SimpleIntentStore.java b/core/store/trivial/src/main/java/org/onlab/onos/store/trivial/impl/SimpleIntentStore.java
index 5a91276..51ee166 100644
--- a/core/store/trivial/src/main/java/org/onlab/onos/store/trivial/impl/SimpleIntentStore.java
+++ b/core/store/trivial/src/main/java/org/onlab/onos/store/trivial/impl/SimpleIntentStore.java
@@ -33,6 +33,7 @@
 import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
 
+import static com.google.common.base.Preconditions.checkState;
 import static org.onlab.onos.net.intent.IntentState.WITHDRAWN;
 import static org.slf4j.LoggerFactory.getLogger;
 
@@ -68,16 +69,12 @@
     }
 
     @Override
-    public IntentEvent removeIntent(IntentId intentId) {
-        Intent intent = intents.remove(intentId);
+    public void removeIntent(IntentId intentId) {
+        checkState(getIntentState(intentId) == WITHDRAWN,
+                   "Intent state for {} is not WITHDRAWN.", intentId);
+        intents.remove(intentId);
         installable.remove(intentId);
-        if (intent == null) {
-            // was already removed
-            return null;
-        }
-        IntentEvent event = this.setState(intent, WITHDRAWN);
         states.remove(intentId);
-        return event;
     }
 
     @Override