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/*******************************************************************************
* 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();
}
}
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