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; 020 021 import org.apache.camel.Exchange; 022 import org.apache.camel.component.file.GenericFile; 023 import org.apache.camel.component.file.GenericFileEndpoint; 024 import org.apache.camel.component.file.GenericFileExclusiveReadLockStrategy; 025 import org.apache.camel.component.file.GenericFileOperations; 026 import org.apache.camel.component.file.GenericFileProcessStrategy; 027 import org.apache.commons.logging.Log; 028 import org.apache.commons.logging.LogFactory; 029 030 public abstract class GenericFileProcessStrategySupport<T> implements GenericFileProcessStrategy<T> { 031 protected final transient Log log = LogFactory.getLog(getClass()); 032 protected GenericFileExclusiveReadLockStrategy<T> exclusiveReadLockStrategy; 033 034 public boolean begin(GenericFileOperations<T> operations, GenericFileEndpoint<T> endpoint, Exchange exchange, GenericFile<T> file) throws Exception { 035 // is we use excluse read then acquire the exclusive read (waiting until we got it) 036 if (exclusiveReadLockStrategy != null) { 037 boolean lock = exclusiveReadLockStrategy.acquireExclusiveReadLock(operations, file, exchange); 038 if (!lock) { 039 // do not begin sice we could not get the exclusive read lcok 040 return false; 041 } 042 } 043 044 return true; 045 } 046 047 public void commit(GenericFileOperations<T> operations, GenericFileEndpoint<T> endpoint, Exchange exchange, GenericFile<T> file) throws Exception { 048 if (exclusiveReadLockStrategy != null) { 049 exclusiveReadLockStrategy.releaseExclusiveReadLock(operations, file, exchange); 050 } 051 052 deleteLocalWorkFile(exchange); 053 } 054 055 public void rollback(GenericFileOperations<T> operations, GenericFileEndpoint<T> endpoint, Exchange exchange, GenericFile<T> file) throws Exception { 056 if (exclusiveReadLockStrategy != null) { 057 exclusiveReadLockStrategy.releaseExclusiveReadLock(operations, file, exchange); 058 } 059 060 deleteLocalWorkFile(exchange); 061 } 062 063 public GenericFileExclusiveReadLockStrategy<T> getExclusiveReadLockStrategy() { 064 return exclusiveReadLockStrategy; 065 } 066 067 public void setExclusiveReadLockStrategy(GenericFileExclusiveReadLockStrategy<T> exclusiveReadLockStrategy) { 068 this.exclusiveReadLockStrategy = exclusiveReadLockStrategy; 069 } 070 071 private void deleteLocalWorkFile(Exchange exchange) { 072 // delete local work file, if it was used (eg by ftp component) 073 File local = exchange.getIn().getHeader(Exchange.FILE_LOCAL_WORK_PATH, File.class); 074 if (local != null && local.exists()) { 075 boolean deleted = local.delete(); 076 if (log.isTraceEnabled()) { 077 log.trace("Local work file: " + local + " was deleted: " + deleted); 078 } 079 } 080 } 081 } 082