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 */ 017package org.apache.camel.component.file.strategy; 018 019import org.apache.camel.Exchange; 020import org.apache.camel.component.file.GenericFile; 021import org.apache.camel.component.file.GenericFileEndpoint; 022import org.apache.camel.component.file.GenericFileOperationFailedException; 023import org.apache.camel.component.file.GenericFileOperations; 024import org.apache.camel.util.ExchangeHelper; 025 026public class GenericFileDeleteProcessStrategy<T> extends GenericFileProcessStrategySupport<T> { 027 028 private GenericFileRenamer<T> failureRenamer; 029 private GenericFileRenamer<T> beginRenamer; 030 031 @Override 032 public boolean begin(GenericFileOperations<T> operations, GenericFileEndpoint<T> endpoint, Exchange exchange, GenericFile<T> file) throws Exception { 033 034 // must invoke super 035 boolean result = super.begin(operations, endpoint, exchange, file); 036 if (!result) { 037 return false; 038 } 039 040 // okay we got the file then execute the begin renamer 041 if (beginRenamer != null) { 042 GenericFile<T> newName = beginRenamer.renameFile(exchange, file); 043 GenericFile<T> to = renameFile(operations, file, newName); 044 if (to != null) { 045 to.bindToExchange(exchange); 046 } 047 } 048 049 return true; 050 } 051 052 @Override 053 public void commit(GenericFileOperations<T> operations, GenericFileEndpoint<T> endpoint, Exchange exchange, GenericFile<T> file) throws Exception { 054 055 // special for file lock strategy as we must release that lock first before we can delete the file 056 boolean releaseEager = exclusiveReadLockStrategy instanceof FileLockExclusiveReadLockStrategy; 057 058 if (releaseEager) { 059 exclusiveReadLockStrategy.releaseExclusiveReadLockOnCommit(operations, file, exchange); 060 } 061 062 try { 063 deleteLocalWorkFile(exchange); 064 operations.releaseRetrievedFileResources(exchange); 065 066 int retries = 3; 067 boolean deleted = false; 068 069 while (retries > 0 && !deleted) { 070 retries--; 071 072 if (operations.deleteFile(file.getAbsoluteFilePath())) { 073 // file is deleted 074 deleted = true; 075 break; 076 } 077 078 // some OS can report false when deleting but the file is still deleted 079 // use exists to check instead 080 boolean exits = operations.existsFile(file.getAbsoluteFilePath()); 081 if (!exits) { 082 deleted = true; 083 } else { 084 log.trace("File was not deleted at this attempt will try again in 1 sec.: {}", file); 085 // sleep a bit and try again 086 Thread.sleep(1000); 087 } 088 } 089 if (!deleted) { 090 throw new GenericFileOperationFailedException("Cannot delete file: " + file); 091 } 092 } finally { 093 // must release lock last 094 if (!releaseEager && exclusiveReadLockStrategy != null) { 095 exclusiveReadLockStrategy.releaseExclusiveReadLockOnCommit(operations, file, exchange); 096 } 097 } 098 } 099 100 @Override 101 public void rollback(GenericFileOperations<T> operations, GenericFileEndpoint<T> endpoint, Exchange exchange, GenericFile<T> file) throws Exception { 102 try { 103 deleteLocalWorkFile(exchange); 104 operations.releaseRetrievedFileResources(exchange); 105 106 // moved the failed file if specifying the moveFailed option 107 if (failureRenamer != null) { 108 // create a copy and bind the file to the exchange to be used by the renamer to evaluate the file name 109 Exchange copy = ExchangeHelper.createCopy(exchange, true); 110 file.bindToExchange(copy); 111 // must preserve message id 112 copy.getIn().setMessageId(exchange.getIn().getMessageId()); 113 copy.setExchangeId(exchange.getExchangeId()); 114 115 GenericFile<T> newName = failureRenamer.renameFile(copy, file); 116 renameFile(operations, file, newName); 117 } 118 } finally { 119 // must release lock last 120 if (exclusiveReadLockStrategy != null) { 121 exclusiveReadLockStrategy.releaseExclusiveReadLockOnRollback(operations, file, exchange); 122 } 123 } 124 } 125 126 public GenericFileRenamer<T> getFailureRenamer() { 127 return failureRenamer; 128 } 129 130 public void setFailureRenamer(GenericFileRenamer<T> failureRenamer) { 131 this.failureRenamer = failureRenamer; 132 } 133 134 public GenericFileRenamer<T> getBeginRenamer() { 135 return beginRenamer; 136 } 137 138 public void setBeginRenamer(GenericFileRenamer<T> beginRenamer) { 139 this.beginRenamer = beginRenamer; 140 } 141}