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