001package org.apache.commons.jcs.auxiliary.remote.http.client; 002 003import java.io.IOException; 004 005/* 006 * Licensed to the Apache Software Foundation (ASF) under one 007 * or more contributor license agreements. See the NOTICE file 008 * distributed with this work for additional information 009 * regarding copyright ownership. The ASF licenses this file 010 * to you under the Apache License, Version 2.0 (the 011 * "License"); you may not use this file except in compliance 012 * with the License. You may obtain a copy of the License at 013 * 014 * http://www.apache.org/licenses/LICENSE-2.0 015 * 016 * Unless required by applicable law or agreed to in writing, 017 * software distributed under the License is distributed on an 018 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 019 * KIND, either express or implied. See the License for the 020 * specific language governing permissions and limitations 021 * under the License. 022 */ 023 024import org.apache.commons.jcs.auxiliary.remote.AbstractRemoteAuxiliaryCache; 025import org.apache.commons.jcs.auxiliary.remote.behavior.IRemoteCacheListener; 026import org.apache.commons.jcs.engine.ZombieCacheServiceNonLocal; 027import org.apache.commons.jcs.engine.behavior.ICacheServiceNonLocal; 028import org.apache.commons.logging.Log; 029import org.apache.commons.logging.LogFactory; 030 031/** 032 * This uses an http client as the service. 033 */ 034public class RemoteHttpCache<K, V> 035 extends AbstractRemoteAuxiliaryCache<K, V> 036{ 037 /** The logger. */ 038 private static final Log log = LogFactory.getLog( RemoteHttpCache.class ); 039 040 /** for error notifications */ 041 private RemoteHttpCacheMonitor monitor; 042 043 /** Keep the child copy here for the restore process. */ 044 private RemoteHttpCacheAttributes remoteHttpCacheAttributes; 045 046 /** 047 * Constructor for the RemoteCache object. This object communicates with a remote cache server. 048 * One of these exists for each region. This also holds a reference to a listener. The same 049 * listener is used for all regions for one remote server. Holding a reference to the listener 050 * allows this object to know the listener id assigned by the remote cache. 051 * <p> 052 * @param remoteHttpCacheAttributes 053 * @param remote 054 * @param listener 055 * @param monitor the cache monitor 056 */ 057 public RemoteHttpCache( RemoteHttpCacheAttributes remoteHttpCacheAttributes, ICacheServiceNonLocal<K, V> remote, 058 IRemoteCacheListener<K, V> listener, RemoteHttpCacheMonitor monitor ) 059 { 060 super( remoteHttpCacheAttributes, remote, listener ); 061 062 this.remoteHttpCacheAttributes = remoteHttpCacheAttributes; 063 this.monitor = monitor; 064 } 065 066 /** 067 * Nothing right now. This should setup a zombie and initiate recovery. 068 * <p> 069 * @param ex 070 * @param msg 071 * @param eventName 072 * @throws IOException 073 */ 074 @Override 075 protected void handleException( Exception ex, String msg, String eventName ) 076 throws IOException 077 { 078 // we should not switch if the existing is a zombie. 079 if ( !( getRemoteCacheService() instanceof ZombieCacheServiceNonLocal ) ) 080 { 081 String message = "Disabling remote cache due to error: " + msg; 082 logError( cacheName, "", message ); 083 log.error( message, ex ); 084 085 setRemoteCacheService( new ZombieCacheServiceNonLocal<K, V>( getRemoteCacheAttributes().getZombieQueueMaxSize() ) ); 086 087 monitor.notifyError( this ); 088 } 089 090 if ( ex instanceof IOException ) 091 { 092 throw (IOException) ex; 093 } 094 throw new IOException( ex.getMessage() ); 095 } 096 097 /** 098 * @return url of service 099 */ 100 @Override 101 public String getEventLoggingExtraInfo() 102 { 103 return null; 104 } 105 106 /** 107 * @return the remoteHttpCacheAttributes 108 */ 109 public RemoteHttpCacheAttributes getRemoteHttpCacheAttributes() 110 { 111 return remoteHttpCacheAttributes; 112 } 113}