001 /** 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017 package org.apache.camel.component.file.strategy; 018 019 import java.io.File; 020 import java.io.RandomAccessFile; 021 import java.nio.channels.Channel; 022 import java.nio.channels.FileChannel; 023 import java.nio.channels.FileLock; 024 025 import org.apache.camel.component.file.FileEndpoint; 026 import org.apache.camel.component.file.FileExchange; 027 import org.apache.camel.util.ExchangeHelper; 028 import org.apache.commons.logging.Log; 029 import org.apache.commons.logging.LogFactory; 030 031 /** 032 * @version $Revision: 1.1 $ 033 */ 034 public abstract class FileStategySupport implements FileStrategy { 035 private static final transient Log LOG = LogFactory.getLog(FileStategySupport.class); 036 private boolean lockFile; 037 038 protected FileStategySupport() { 039 this(true); 040 } 041 042 protected FileStategySupport(boolean lockFile) { 043 this.lockFile = lockFile; 044 } 045 046 public boolean begin(FileEndpoint endpoint, FileExchange exchange, File file) throws Exception { 047 if (isLockFile()) { 048 String lockFileName = file.getAbsoluteFile() + ".lock"; 049 if (LOG.isDebugEnabled()) { 050 LOG.debug("Locking the file: " + file + " using the lock file name: " + lockFileName); 051 } 052 053 FileChannel channel = new RandomAccessFile(lockFileName, "rw").getChannel(); 054 FileLock lock = channel.lock(); 055 if (lock != null) { 056 exchange.setProperty("org.apache.camel.fileChannel", channel); 057 exchange.setProperty("org.apache.camel.file.lock", lock); 058 exchange.setProperty("org.apache.camel.file.lock.name", lockFileName); 059 return true; 060 } 061 return false; 062 } 063 return true; 064 } 065 066 public void commit(FileEndpoint endpoint, FileExchange exchange, File file) throws Exception { 067 if (isLockFile()) { 068 Channel channel = ExchangeHelper.getMandatoryProperty(exchange, "org.apache.camel.fileChannel", Channel.class); 069 String lockfile = ExchangeHelper.getMandatoryProperty(exchange, "org.apache.camel.file.lock.name", String.class); 070 if (LOG.isDebugEnabled()) { 071 LOG.debug("Unlocking file: " + file); 072 } 073 channel.close(); 074 File lock = new File(lockfile); 075 lock.delete(); 076 } 077 } 078 079 public boolean isLockFile() { 080 return lockFile; 081 } 082 083 public void setLockFile(boolean lockFile) { 084 this.lockFile = lockFile; 085 } 086 }