package org.apache.commons.jcs.auxiliary.remote; /* * 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. */ import java.io.IOException; import java.rmi.RemoteException; import java.rmi.server.UnicastRemoteObject; import org.apache.commons.jcs.auxiliary.remote.behavior.IRemoteCacheAttributes; import org.apache.commons.jcs.auxiliary.remote.behavior.IRemoteCacheConstants; import org.apache.commons.jcs.engine.behavior.ICompositeCacheManager; import org.apache.commons.jcs.engine.behavior.IElementSerializer; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; /** * Registered with RemoteCache server. The server updates the local caches via this listener. Each * server assigns a unique listener id for a listener. * <p> * One listener is used per remote cache server. The same listener is used for all the regions that * talk to a particular server. */ public class RemoteCacheListener<K, V> extends AbstractRemoteCacheListener<K, V> implements IRemoteCacheConstants { /** The logger */ private static final Log log = LogFactory.getLog( RemoteCacheListener.class ); /** Has this client been shutdown. */ private boolean disposed = false; /** * Only need one since it does work for all regions, just reference by multiple region names. * <p> * The constructor exports this object, making it available to receive incoming calls. The * callback port is anonymous unless a local port value was specified in the configuration. * <p> * @param irca cache configuration * @param cacheMgr the cache hub * @param elementSerializer a custom serializer */ public RemoteCacheListener( IRemoteCacheAttributes irca, ICompositeCacheManager cacheMgr, IElementSerializer elementSerializer ) { super( irca, cacheMgr, elementSerializer ); // Export this remote object to make it available to receive incoming // calls. try { UnicastRemoteObject.exportObject( this, irca.getLocalPort() ); } catch ( RemoteException ex ) { log.error( "Problem exporting object.", ex ); throw new IllegalStateException( ex.getMessage() ); } } /** * Deregister itself. * <p> * @throws IOException */ @Override public synchronized void dispose() throws IOException { if ( !disposed ) { if ( log.isInfoEnabled() ) { log.info( "Unexporting listener." ); } try { UnicastRemoteObject.unexportObject( this, true ); } catch ( RemoteException ex ) { log.error( "Problem unexporting the listener.", ex ); throw new IllegalStateException( ex.getMessage() ); } disposed = true; } } /** * For easier debugging. * <p> * @return Basic info on this listener. */ @Override public String toString() { StringBuilder buf = new StringBuilder(); buf.append( "\n RemoteCacheListener: " ); buf.append( super.toString() ); return buf.toString(); } }