| /******************************************************************************* |
| * Copyright (c) 2003, 2005 IBM Corporation 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: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| /* |
| * Created on Oct 6, 2003 |
| */ |
| package org.eclipse.wst.common.internal.emfworkbench.edit; |
| |
| import java.util.HashSet; |
| import java.util.Set; |
| import java.util.WeakHashMap; |
| |
| import org.eclipse.jem.internal.util.emf.workbench.nls.EMFWorkbenchResourceHandler; |
| import org.eclipse.wst.common.internal.emfworkbench.EMFWorkbenchEditResourceHandler; |
| |
| /** |
| * @author mdelder |
| */ |
| public class ClientAccessRegistry { |
| |
| protected final WeakHashMap registry = new WeakHashMap(); |
| protected final Set baseSet = new HashSet(); |
| |
| public synchronized void access(Object accessorKey) { |
| if (isStable()) { |
| if (!registry.containsKey(accessorKey)) { |
| Snapshot snapshot = new Snapshot(); |
| this.registry.put(accessorKey, snapshot); |
| this.baseSet.add(snapshot); |
| |
| } else |
| throw new ClientAccessRegistryException(EMFWorkbenchEditResourceHandler.ClientAccessRegistry_ERROR_0, accessorKey); |
| |
| } else |
| complain(); |
| } |
| |
| public synchronized void release(Object accessorKey) { |
| |
| /* |
| * Error condition: Some one has been naughty and not released the resource |
| */ |
| if (this.registry.containsKey(accessorKey) && isStable()) { |
| Snapshot snapshot = (Snapshot) this.registry.remove(accessorKey); |
| this.baseSet.remove(snapshot); |
| } else |
| complain(accessorKey); |
| } |
| |
| public synchronized void assertAccess(Object accessorKey) { |
| if (!isClientAccessing(accessorKey)) |
| throw new ClientAccessRegistryException(EMFWorkbenchResourceHandler.getString("ClientAccessRegistry_ERROR_1"), accessorKey); //$NON-NLS-1$ |
| } |
| |
| public synchronized boolean isClientAccessing(Object client) { |
| boolean result = this.registry.containsKey(client); |
| if (!isStable()) |
| complain(); |
| return result; |
| } |
| |
| public synchronized boolean isAnyClientAccessing() { |
| boolean result = this.registry.size() > 0; |
| if (!isStable()) |
| complain(); |
| return result; |
| } |
| |
| public synchronized boolean isStable() { |
| return this.baseSet.size() == this.registry.size(); |
| } |
| |
| public void complain() { |
| complain(null); |
| } |
| |
| public void complain(Object accessorKey) { |
| if (!isStable()) |
| throw new ClientAccessRegistryException(this.registry, this.baseSet); |
| throw new ClientAccessRegistryException(EMFWorkbenchResourceHandler.getString("ClientAccessRegistry_ERROR_1"), accessorKey); //$NON-NLS-1$ |
| } |
| |
| public String toString() { |
| StringBuffer result = new StringBuffer("ClientAccessRegistry: ["); //$NON-NLS-1$ |
| result.append((isStable()) ? "STABLE" : "OUT OF SYNC"); //$NON-NLS-1$ //$NON-NLS-2$ |
| result.append("]: Reference Count = "); //$NON-NLS-1$ |
| result.append(this.size()); |
| return result.toString(); |
| } |
| |
| public synchronized int size() { |
| return this.registry.size(); |
| } |
| |
| } |