| /******************************************************************************* |
| * Copyright (c) 2011, 2012 EclipseSource 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 |
| * |
| * Contributors: |
| * EclipseSource - initial API and implementation |
| ******************************************************************************/ |
| package org.eclipse.rap.rwt.internal.serverpush; |
| |
| import java.util.HashSet; |
| import java.util.Set; |
| |
| import org.eclipse.rap.rwt.internal.util.SerializableLock; |
| import org.eclipse.swt.internal.SerializableCompatibility; |
| |
| |
| final class ServerPushActivationTracker implements SerializableCompatibility { |
| private final Set<Object> handles; |
| private final SerializableLock lock; |
| |
| ServerPushActivationTracker() { |
| handles = new HashSet<Object>(); |
| lock = new SerializableLock(); |
| } |
| |
| void activate( Object handle ) { |
| synchronized( lock ) { |
| handles.add( handle ); |
| } |
| } |
| |
| void deactivate( Object handle ) { |
| synchronized( lock ) { |
| handles.remove( handle ); |
| } |
| } |
| |
| boolean isActive() { |
| synchronized( lock ) { |
| return !handles.isEmpty(); |
| } |
| } |
| |
| } |