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JCR-RMI is a transparent Remote Method Invocation (RMI) layer for the Content Repository for Java Technology API (JCR). The layer makes it possible to remotely access JCR content repositories.

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.jackrabbit.rmi.server;

import java.rmi.RemoteException;
import java.util.HashMap;
import java.util.Map;

import javax.jcr.RepositoryException;
import javax.jcr.observation.ObservationManager;

import org.apache.jackrabbit.rmi.observation.Queue;
import org.apache.jackrabbit.rmi.observation.ServerEventListenerProxy;
import org.apache.jackrabbit.rmi.remote.RemoteEventCollection;
import org.apache.jackrabbit.rmi.remote.RemoteObservationManager;

/**
 * Remote adapter for the JCR
 * {@link javax.jcr.observation.ObservationManager ObservationManager} interface.
 * This class makes a local item available as an RMI service using
 * the {@link org.apache.jackrabbit.rmi.remote.RemoteObservationManager RemoteObservationManager}
 * interface.
 * 

* This class works in conjunction with the * {@link org.apache.jackrabbit.rmi.client.ClientObservationManager} class to * implement the distributed the event listener registration described in * observation package * comment. * * @see javax.jcr.observation.ObservationManager * @see org.apache.jackrabbit.rmi.remote.RemoteObservationManager */ public class ServerObservationManager extends ServerObject implements RemoteObservationManager { /** The adapted local observation manager. */ private ObservationManager observationManager; /** * The map of event listener proxies indexed by the unique identifier. */ private Map proxyMap; /** * The queue to which event listener proxies post events to be reported * by the {@link #getNextEvent(long)} method. */ private Queue queue; /** * Creates a remote adapter for the given local workspace. * * @param observationManager local observation manager * @param factory remote adapter factory * @throws RemoteException on RMI errors */ public ServerObservationManager(ObservationManager observationManager, RemoteAdapterFactory factory) throws RemoteException { super(factory); this.observationManager = observationManager; } /** {@inheritDoc} */ public void addEventListener(long listenerId, int eventTypes, String absPath, boolean isDeep, String[] uuid, String[] nodeTypeName, boolean noLocal) throws RepositoryException, RemoteException { // find the proxy or create one ServerEventListenerProxy proxy; synchronized (this) { if (proxyMap == null) { proxyMap = new HashMap(); } Long id = Long.valueOf(listenerId); proxy = proxyMap.get(id); if (proxy == null) { proxy = new ServerEventListenerProxy(getFactory(), listenerId, getQueue()); proxyMap.put(id, proxy); } } // register the proxy with the observation manager observationManager.addEventListener(proxy, eventTypes, absPath, isDeep, uuid, nodeTypeName, noLocal); } /** {@inheritDoc} */ public void removeEventListener(long listenerId) throws RepositoryException, RemoteException { // try to find the proxy in the map ServerEventListenerProxy proxy; synchronized (this) { if (proxyMap == null) { return; } Long id = new Long(listenerId); proxy = (ServerEventListenerProxy) proxyMap.remove(id); if (proxy == null) { return; } } // register the proxy with the observation manager observationManager.removeEventListener(proxy); } /** {@inheritDoc} */ public RemoteEventCollection getNextEvent(long timeout) throws RemoteException { // need the queue checkQueue(); try { if (timeout < 0) { timeout = 0; } return (RemoteEventCollection) queue.get(timeout); } catch (InterruptedException ie) { // don't retry, but log } // did not get anything, fall back to nothing return null; } //---------- internal ------------------------------------------------------ /** * Makes sure, the {@link #queue} field is assigned a value. */ private synchronized void checkQueue() { if (queue == null) { queue = new Queue(); } } /** * Returns the Channel allocating it if required. * * @return queue */ private Queue getQueue() { checkQueue(); return queue; } }





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