| /******************************************************************************* |
| * This file is part of the Virgo Web Server. |
| * |
| * Copyright (c) 2010 VMware Inc. |
| * 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: |
| * SpringSource, a division of VMware - initial API and implementation and/or initial documentation |
| *******************************************************************************/ |
| |
| package org.eclipse.virgo.kernel.core.internal; |
| |
| import java.util.HashSet; |
| import java.util.Set; |
| |
| import org.osgi.framework.BundleContext; |
| import org.osgi.framework.ServiceReference; |
| |
| |
| /** |
| * Utility class that tracks a set of {@link ServiceReference}s for a bundle and allows them to be safely |
| * ungotten. |
| * <p/> |
| * <code>ServiceReferences</code> are tracked in a thread-safe manner, and are ungotten without |
| * holding any locks. |
| * |
| * @see ServiceReference |
| */ |
| class ServiceReferenceTracker { |
| |
| private final BundleContext context; |
| |
| private final Object monitor = new Object(); |
| |
| private Set<ServiceReference> references; // protected by monitor. |
| |
| |
| ServiceReferenceTracker(BundleContext context) { |
| this.context = context; |
| } |
| |
| /** |
| * Tracks the supplied {@link ServiceReference}. This <code>ServiceReference</code> will be |
| * {@link BundleContext#ungetService ungotten} during {@link #ungetAll()}. |
| * |
| * @param reference the <code>ServiceReference</code> to track. |
| * @return the reference itself |
| */ |
| public ServiceReference track(ServiceReference reference) { |
| synchronized (this.monitor) { |
| if (this.references == null) { |
| this.references = new HashSet<ServiceReference>(); |
| } |
| this.references.add(reference); |
| } |
| return reference; |
| } |
| |
| /** |
| * Safely unregisters all the tracked <code>ServiceRegistrations</code>. |
| */ |
| public void ungetAll() { |
| Set<ServiceReference> toUnget = null; |
| synchronized (this.monitor) { |
| toUnget = this.references; |
| this.references = null; |
| } |
| if (toUnget != null) { |
| for (ServiceReference serviceReference : toUnget) { |
| try { |
| this.context.ungetService(serviceReference); |
| } catch (IllegalStateException e) { |
| } |
| } |
| } |
| } |
| } |