Make DOMMountPointService listenable

[controller.git] / opendaylight / md-sal / sal-dom-broker / src / main / java / org / opendaylight / controller / sal / dom / broker / GlobalBundleScanningSchemaServiceImpl.java

diff --git a/opendaylight/md-sal/sal-dom-broker/src/main/java/org/opendaylight/controller/sal/dom/broker/GlobalBundleScanningSchemaServiceImpl.java b/opendaylight/md-sal/sal-dom-broker/src/main/java/org/opendaylight/controller/sal/dom/broker/GlobalBundleScanningSchemaServiceImpl.java
index 076fca6f10dbf10070b85ced50aee655c17c94d4..60a7e81c4c046183e6ee59e0f27d48e5a15e90bc 100644 (file)
--- a/opendaylight/md-sal/sal-dom-broker/src/main/java/org/opendaylight/controller/sal/dom/broker/GlobalBundleScanningSchemaServiceImpl.java
+++ b/opendaylight/md-sal/sal-dom-broker/src/main/java/org/opendaylight/controller/sal/dom/broker/GlobalBundleScanningSchemaServiceImpl.java
@@ -9,6 +9,7 @@ package org.opendaylight.controller.sal.dom.broker;
 
 import static com.google.common.base.Preconditions.checkState;
 
+import com.google.common.annotations.VisibleForTesting;
 import java.net.URL;
 import java.util.ArrayList;
 import java.util.Collections;
@@ -36,48 +37,52 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 import com.google.common.base.Optional;
+import com.google.common.base.Preconditions;
 import com.google.common.collect.ImmutableList;
 
-public class GlobalBundleScanningSchemaServiceImpl implements //
-SchemaContextProvider, //
-SchemaService, //
-ServiceTrackerCustomizer<SchemaServiceListener, SchemaServiceListener>, //
-AutoCloseable {
+public class GlobalBundleScanningSchemaServiceImpl implements SchemaContextProvider, SchemaService, ServiceTrackerCustomizer<SchemaServiceListener, SchemaServiceListener>, AutoCloseable {
     private static final Logger LOG = LoggerFactory.getLogger(GlobalBundleScanningSchemaServiceImpl.class);
 
+    private final ListenerRegistry<SchemaServiceListener> listeners = new ListenerRegistry<>();
     private final URLSchemaContextResolver contextResolver = new URLSchemaContextResolver();
     private final BundleScanner scanner = new BundleScanner();
+    private final BundleContext context;
+
     private ServiceTracker<SchemaServiceListener, SchemaServiceListener> listenerTracker;
     private BundleTracker<Iterable<Registration<URL>>> bundleTracker;
-    private ListenerRegistry<SchemaServiceListener> listeners;
     private boolean starting = true;
-    private BundleContext context;
+    private static GlobalBundleScanningSchemaServiceImpl instance;
 
-    public ListenerRegistry<SchemaServiceListener> getListeners() {
-        return listeners;
+    private GlobalBundleScanningSchemaServiceImpl(final BundleContext context) {
+        this.context = Preconditions.checkNotNull(context);
     }
 
-    public void setListeners(final ListenerRegistry<SchemaServiceListener> listeners) {
-        this.listeners = listeners;
+    public synchronized static GlobalBundleScanningSchemaServiceImpl createInstance(final BundleContext ctx) {
+        Preconditions.checkState(instance == null);
+        instance = new GlobalBundleScanningSchemaServiceImpl(ctx);
+        instance.start();
+        return instance;
     }
 
-    public BundleContext getContext() {
-        return context;
+    public synchronized static GlobalBundleScanningSchemaServiceImpl getInstance() {
+        Preconditions.checkState(instance != null, "Global Instance was not instantiated");
+        return instance;
+    }
+
+    @VisibleForTesting
+    public static synchronized void destroyInstance() {
+        instance = null;
     }
 
-    public void setContext(final BundleContext context) {
-        this.context = context;
+    public BundleContext getContext() {
+        return context;
     }
 
     public void start() {
         checkState(context != null);
-        if (listeners == null) {
-            listeners = new ListenerRegistry<>();
-        }
 
         listenerTracker = new ServiceTracker<>(context, SchemaServiceListener.class, GlobalBundleScanningSchemaServiceImpl.this);
-        bundleTracker = new BundleTracker<Iterable<Registration<URL>>>(context, BundleEvent.RESOLVED
-                | BundleEvent.UNRESOLVED, scanner);
+        bundleTracker = new BundleTracker<>(context, BundleEvent.RESOLVED | BundleEvent.UNRESOLVED, scanner);
         bundleTracker.open();
         listenerTracker.open();
         starting = false;
@@ -110,7 +115,7 @@ AutoCloseable {
     }
 
     @Override
-    public ListenerRegistration<SchemaServiceListener> registerSchemaServiceListener(final SchemaServiceListener listener) {
+    public synchronized ListenerRegistration<SchemaServiceListener> registerSchemaServiceListener(final SchemaServiceListener listener) {
         Optional<SchemaContext> potentialCtx = contextResolver.getSchemaContext();
         if(potentialCtx.isPresent()) {
             listener.onGlobalContextUpdated(potentialCtx.get());
@@ -130,7 +135,7 @@ AutoCloseable {
     }
 
 
-    private void updateContext(final SchemaContext snapshot) {
+    private synchronized void updateContext(final SchemaContext snapshot) {
         Object[] services = listenerTracker.getServices();
         for (ListenerRegistration<SchemaServiceListener> listener : listeners) {
             try {
@@ -208,7 +213,7 @@ AutoCloseable {
     }
 
     @Override
-    public SchemaServiceListener addingService(final ServiceReference<SchemaServiceListener> reference) {
+    public synchronized SchemaServiceListener addingService(final ServiceReference<SchemaServiceListener> reference) {
 
         SchemaServiceListener listener = context.getService(reference);
         SchemaContext _ctxContext = getGlobalContext();
@@ -219,7 +224,7 @@ AutoCloseable {
     }
 
     public synchronized void tryToUpdateSchemaContext() {
-        if(starting ) {
+        if (starting) {
             return;
         }
         Optional<SchemaContext> schema = contextResolver.tryToUpdateSchemaContext();