Fix findbugs violations in md-sal - part 1

[controller.git] / opendaylight / md-sal / sal-dom-api / src / main / java / org / opendaylight / controller / sal / core / api / AbstractConsumer.java

diff --git a/opendaylight/md-sal/sal-dom-api/src/main/java/org/opendaylight/controller/sal/core/api/AbstractConsumer.java b/opendaylight/md-sal/sal-dom-api/src/main/java/org/opendaylight/controller/sal/core/api/AbstractConsumer.java
index 5e13aad49918ccf6c4e79a08f5411abd31066c10..46e9cdcd718917c4f26f33647eb1bf197a477d3f 100644 (file)
--- a/opendaylight/md-sal/sal-dom-api/src/main/java/org/opendaylight/controller/sal/core/api/AbstractConsumer.java
+++ b/opendaylight/md-sal/sal-dom-api/src/main/java/org/opendaylight/controller/sal/core/api/AbstractConsumer.java
@@ -1,40 +1,76 @@
+/*
+ * Copyright (c) 2013 Cisco Systems, Inc. and others.  All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v1.0 which accompanies this distribution,
+ * and is available at http://www.eclipse.org/legal/epl-v10.html
+ */
 package org.opendaylight.controller.sal.core.api;
 
 import java.util.Collection;
 import java.util.Collections;
-
 import org.osgi.framework.BundleActivator;
 import org.osgi.framework.BundleContext;
 import org.osgi.framework.ServiceReference;
+import org.osgi.util.tracker.ServiceTracker;
+import org.osgi.util.tracker.ServiceTrackerCustomizer;
 
-public abstract class AbstractConsumer implements Consumer, BundleActivator {
-
-    Broker broker;
-    ServiceReference<Broker> brokerRef;
-    @Override
-    public final void start(BundleContext context) throws Exception {
-        brokerRef = context.getServiceReference(Broker.class);
-        broker = context.getService(brokerRef);
+public abstract class AbstractConsumer implements Consumer, BundleActivator,ServiceTrackerCustomizer<Broker, Broker> {
 
-        this.startImpl(context);
+    private BundleContext context;
+    private ServiceTracker<Broker, Broker> tracker;
+    private Broker broker;
 
-        broker.registerConsumer(this,context);
+    @Override
+    public final void start(final BundleContext bundleContext) throws Exception {
+        this.context = bundleContext;
+        this.startImpl(bundleContext);
+        tracker = new ServiceTracker<>(bundleContext, Broker.class, this);
+        tracker.open();
     }
 
-    public abstract void startImpl(BundleContext context);
-
     @Override
-    public final void stop(BundleContext context) throws Exception {
+    public final void stop(final BundleContext bundleContext) throws Exception {
+        stopImpl(bundleContext);
         broker = null;
-        if(brokerRef != null) {
-            context.ungetService(brokerRef);
+
+        if (tracker != null) {
+            tracker.close();
         }
     }
 
-    
+    protected void startImpl(final BundleContext bundleContext) {
+        // NOOP
+    }
+
+    protected void stopImpl(final BundleContext bundleContext) {
+        // NOOP
+    }
+
     @Override
     public Collection<ConsumerFunctionality> getConsumerFunctionality() {
         return Collections.emptySet();
     }
 
+
+    @Override
+    public Broker addingService(final ServiceReference<Broker> reference) {
+        if (broker == null && context != null) {
+            broker = context.getService(reference);
+            broker.registerConsumer(this, context);
+            return broker;
+        }
+
+        return null;
+    }
+
+    @Override
+    public void modifiedService(final ServiceReference<Broker> reference, final Broker service) {
+        // NOOP
+    }
+
+    @Override
+    public void removedService(final ServiceReference<Broker> reference, final Broker service) {
+        stopImpl(context);
+    }
 }