Moved legacy Notification implementation to compat package.

[controller.git] / opendaylight / md-sal / sal-binding-broker / src / main / java / org / opendaylight / controller / md / sal / binding / compat / HydrogenNotificationBrokerImpl.java

diff --git a/opendaylight/md-sal/sal-binding-broker/src/main/java/org/opendaylight/controller/md/sal/binding/compat/HydrogenNotificationBrokerImpl.java b/opendaylight/md-sal/sal-binding-broker/src/main/java/org/opendaylight/controller/md/sal/binding/compat/HydrogenNotificationBrokerImpl.java
new file mode 100644 (file)
index 0000000..c50c4cb
--- /dev/null
+++ b/opendaylight/md-sal/sal-binding-broker/src/main/java/org/opendaylight/controller/md/sal/binding/compat/HydrogenNotificationBrokerImpl.java
@@ -0,0 +1,159 @@
+/**
+ * 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.md.sal.binding.compat;
+
+import java.util.Set;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.atomic.AtomicReference;
+
+import javax.annotation.concurrent.GuardedBy;
+
+import org.opendaylight.controller.sal.binding.api.NotificationListener;
+import org.opendaylight.controller.sal.binding.api.NotificationProviderService;
+import org.opendaylight.controller.sal.binding.codegen.impl.SingletonHolder;
+import org.opendaylight.controller.sal.binding.spi.NotificationInvokerFactory.NotificationInvoker;
+import org.opendaylight.yangtools.concepts.AbstractListenerRegistration;
+import org.opendaylight.yangtools.concepts.ListenerRegistration;
+import org.opendaylight.yangtools.util.ListenerRegistry;
+import org.opendaylight.yangtools.yang.binding.Notification;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import com.google.common.base.Preconditions;
+import com.google.common.collect.HashMultimap;
+import com.google.common.collect.Multimap;
+
+public class HydrogenNotificationBrokerImpl implements NotificationProviderService, AutoCloseable {
+    private static final Logger LOG = LoggerFactory.getLogger(HydrogenNotificationBrokerImpl.class);
+
+    private final ListenerRegistry<NotificationInterestListener> interestListeners =
+            ListenerRegistry.create();
+    private final AtomicReference<ListenerMapGeneration> listeners = new AtomicReference<>(new ListenerMapGeneration());
+    private final ExecutorService executor;
+
+    public HydrogenNotificationBrokerImpl(final ExecutorService executor) {
+        this.executor = Preconditions.checkNotNull(executor);
+    }
+
+    @Override
+    public void publish(final Notification notification) {
+        publish(notification, executor);
+    }
+
+    @Override
+    public void publish(final Notification notification, final ExecutorService service) {
+        for (NotificationListenerRegistration<?> r : listeners.get().listenersFor(notification)) {
+            service.submit(new NotifyTask(r, notification));
+        }
+    }
+
+    @GuardedBy("this")
+    private Multimap<Class<? extends Notification>, NotificationListenerRegistration<?>> mutableListeners() {
+        return HashMultimap.create(listeners.get().getListeners());
+    }
+
+    private final void addRegistrations(final NotificationListenerRegistration<?>... registrations) {
+        synchronized (this) {
+            final Multimap<Class<? extends Notification>, NotificationListenerRegistration<?>> newListeners =
+                    mutableListeners();
+            for (NotificationListenerRegistration<?> reg : registrations) {
+                newListeners.put(reg.getType(), reg);
+            }
+
+            listeners.set(new ListenerMapGeneration(newListeners));
+        }
+
+        // Notifications are dispatched out of lock...
+        for (NotificationListenerRegistration<?> reg : registrations) {
+            announceNotificationSubscription(reg.getType());
+        }
+    }
+
+    private synchronized void removeRegistrations(final NotificationListenerRegistration<?>... registrations) {
+        final Multimap<Class<? extends Notification>, NotificationListenerRegistration<?>> newListeners =
+                mutableListeners();
+
+        for (NotificationListenerRegistration<?> reg : registrations) {
+            newListeners.remove(reg.getType(), reg);
+        }
+
+        listeners.set(new ListenerMapGeneration(newListeners));
+    }
+
+    private void announceNotificationSubscription(final Class<? extends Notification> notification) {
+        for (final ListenerRegistration<NotificationInterestListener> listener : interestListeners) {
+            try {
+                listener.getInstance().onNotificationSubscribtion(notification);
+            } catch (Exception e) {
+                LOG.warn("Listener {} reported unexpected error on notification {}",
+                        listener.getInstance(), notification, e);
+            }
+        }
+    }
+
+    @Override
+    public ListenerRegistration<NotificationInterestListener> registerInterestListener(final NotificationInterestListener interestListener) {
+        final ListenerRegistration<NotificationInterestListener> registration = this.interestListeners.register(interestListener);
+
+        for (final Class<? extends Notification> notification : listeners.get().getKnownTypes()) {
+            interestListener.onNotificationSubscribtion(notification);
+        }
+        return registration;
+    }
+
+    @Override
+    public <T extends Notification> NotificationListenerRegistration<T> registerNotificationListener(final Class<T> notificationType, final NotificationListener<T> listener) {
+        final NotificationListenerRegistration<T> reg = new AbstractNotificationListenerRegistration<T>(notificationType, listener) {
+            @Override
+            protected void removeRegistration() {
+                removeRegistrations(this);
+            }
+        };
+
+        addRegistrations(reg);
+        return reg;
+    }
+
+    @Override
+    public ListenerRegistration<org.opendaylight.yangtools.yang.binding.NotificationListener> registerNotificationListener(final org.opendaylight.yangtools.yang.binding.NotificationListener listener) {
+        final NotificationInvoker invoker = SingletonHolder.INVOKER_FACTORY.invokerFor(listener);
+        final Set<Class<? extends Notification>> types = invoker.getSupportedNotifications();
+        final NotificationListenerRegistration<?>[] regs = new NotificationListenerRegistration<?>[types.size()];
+
+        // Populate the registrations...
+        int i = 0;
+        for (Class<? extends Notification> type : types) {
+            regs[i] = new AggregatedNotificationListenerRegistration<Notification, Object>(type, invoker.getInvocationProxy(), regs) {
+                @Override
+                protected void removeRegistration() {
+                    // Nothing to do, will be cleaned up by parent (below)
+                }
+            };
+            ++i;
+        }
+
+        // ... now put them to use ...
+        addRegistrations(regs);
+
+        // ... finally return the parent registration
+        return new AbstractListenerRegistration<org.opendaylight.yangtools.yang.binding.NotificationListener>(listener) {
+            @Override
+            protected void removeRegistration() {
+                removeRegistrations(regs);
+                for (ListenerRegistration<?> reg : regs) {
+                    reg.close();
+                }
+            }
+        };
+    }
+
+    @Override
+    public void close() {
+    }
+
+}