| /******************************************************************************* |
| * Copyright (c) 2007, 2017 IBM Corporation and others. |
| * |
| * This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License 2.0 |
| * which accompanies this distribution, and is available at |
| * https://www.eclipse.org/legal/epl-2.0/ |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.equinox.internal.p2.core; |
| |
| import java.util.EventObject; |
| import org.eclipse.core.runtime.IStatus; |
| import org.eclipse.core.runtime.Status; |
| import org.eclipse.equinox.internal.p2.core.helpers.LogHelper; |
| import org.eclipse.equinox.internal.provisional.p2.core.eventbus.*; |
| import org.eclipse.equinox.p2.core.spi.IAgentService; |
| import org.eclipse.osgi.framework.eventmgr.*; |
| |
| /** |
| * Default implementation of the {@link IProvisioningEventBus} service. |
| */ |
| public class ProvisioningEventBus implements EventDispatcher<ProvisioningListener, ProvisioningListener, EventObject>, IProvisioningEventBus, IAgentService { |
| private final CopyOnWriteIdentityMap<ProvisioningListener, ProvisioningListener> syncListeners = new CopyOnWriteIdentityMap<>(); |
| private final CopyOnWriteIdentityMap<ProvisioningListener, ProvisioningListener> asyncListeners = new CopyOnWriteIdentityMap<>(); |
| private EventManager eventManager = new EventManager("Provisioning Event Dispatcher"); //$NON-NLS-1$ |
| |
| private Object dispatchEventLock = new Object(); |
| /* @GuardedBy("dispatchEventLock") */ |
| private boolean closed = false; |
| /* @GuardedBy("dispatchEventLock") */ |
| private int dispatchingEvents = 0; |
| |
| public ProvisioningEventBus() { |
| super(); |
| } |
| |
| @Override |
| public void addListener(ProvisioningListener toAdd) { |
| if (toAdd instanceof SynchronousProvisioningListener) { |
| synchronized (syncListeners) { |
| syncListeners.put(toAdd, toAdd); |
| } |
| } else { |
| synchronized (asyncListeners) { |
| asyncListeners.put(toAdd, toAdd); |
| } |
| } |
| } |
| |
| @Override |
| public void removeListener(ProvisioningListener toRemove) { |
| if (toRemove instanceof SynchronousProvisioningListener) { |
| synchronized (syncListeners) { |
| syncListeners.remove(toRemove); |
| } |
| } else { |
| synchronized (asyncListeners) { |
| asyncListeners.remove(toRemove); |
| } |
| } |
| } |
| |
| @Override |
| public void publishEvent(EventObject event) { |
| synchronized (dispatchEventLock) { |
| if (closed) |
| return; |
| } |
| /* queue to hold set of listeners */ |
| ListenerQueue<ProvisioningListener, ProvisioningListener, EventObject> listeners = new ListenerQueue<>(eventManager); |
| |
| /* synchronize while building the listener list */ |
| synchronized (syncListeners) { |
| /* add set of BundleContexts w/ listeners to queue */ |
| listeners.queueListeners(syncListeners.entrySet(), this); |
| /* synchronously dispatch to populate listeners queue */ |
| listeners.dispatchEventSynchronous(0, event); |
| } |
| |
| listeners = new ListenerQueue<>(eventManager); |
| synchronized (asyncListeners) { |
| listeners.queueListeners(asyncListeners.entrySet(), this); |
| synchronized (dispatchEventLock) { |
| if (!closed) |
| listeners.dispatchEventAsynchronous(0, event); |
| } |
| } |
| } |
| |
| @Override |
| public void dispatchEvent(ProvisioningListener eventListener, ProvisioningListener listenerObject, int eventAction, EventObject eventObject) { |
| synchronized (dispatchEventLock) { |
| if (closed) |
| return; |
| dispatchingEvents++; |
| } |
| try { |
| eventListener.notify(eventObject); |
| } catch (Exception e) { |
| LogHelper.log(new Status(IStatus.ERROR, Activator.ID, "Exception during event notification", e)); //$NON-NLS-1$ |
| } finally { |
| synchronized (dispatchEventLock) { |
| dispatchingEvents--; |
| if (dispatchingEvents == 0) |
| dispatchEventLock.notifyAll(); |
| } |
| } |
| } |
| |
| @Override |
| public void close() { |
| boolean interrupted = false; |
| synchronized (dispatchEventLock) { |
| eventManager.close(); |
| closed = true; |
| while (dispatchingEvents != 0) { |
| try { |
| dispatchEventLock.wait(30000); // we're going to cap waiting time at 30s |
| break; |
| } catch (InterruptedException e) { |
| // keep waiting but flag interrupted |
| interrupted = true; |
| } |
| } |
| } |
| if (interrupted) |
| Thread.currentThread().interrupt(); |
| } |
| |
| @Override |
| public void start() { |
| //nothing to do |
| } |
| |
| @Override |
| public void stop() { |
| close(); |
| } |
| } |