| /** |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.camel.component.file.strategy; |
| |
| import java.io.File; |
| import java.io.IOException; |
| |
| import org.apache.camel.Exchange; |
| import org.apache.camel.component.file.GenericFile; |
| import org.apache.camel.component.file.GenericFileEndpoint; |
| import org.apache.camel.component.file.GenericFileExclusiveReadLockStrategy; |
| import org.apache.camel.component.file.GenericFileOperationFailedException; |
| import org.apache.camel.component.file.GenericFileOperations; |
| import org.apache.camel.component.file.GenericFileProcessStrategy; |
| import org.apache.camel.util.FileUtil; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| public abstract class GenericFileProcessStrategySupport<T> implements GenericFileProcessStrategy<T> { |
| protected final transient Logger log = LoggerFactory.getLogger(getClass()); |
| protected GenericFileExclusiveReadLockStrategy<T> exclusiveReadLockStrategy; |
| |
| public void prepareOnStartup(GenericFileOperations<T> operations, GenericFileEndpoint<T> endpoint) throws Exception { |
| if (exclusiveReadLockStrategy != null) { |
| exclusiveReadLockStrategy.prepareOnStartup(operations, endpoint); |
| } |
| } |
| |
| public boolean begin(GenericFileOperations<T> operations, GenericFileEndpoint<T> endpoint, Exchange exchange, GenericFile<T> file) throws Exception { |
| // if we use exclusive read then acquire the exclusive read (waiting until we got it) |
| if (exclusiveReadLockStrategy != null) { |
| boolean lock = exclusiveReadLockStrategy.acquireExclusiveReadLock(operations, file, exchange); |
| if (!lock) { |
| // do not begin since we could not get the exclusive read lock |
| return false; |
| } |
| } |
| |
| return true; |
| } |
| |
| public void commit(GenericFileOperations<T> operations, GenericFileEndpoint<T> endpoint, Exchange exchange, GenericFile<T> file) throws Exception { |
| if (exclusiveReadLockStrategy != null) { |
| exclusiveReadLockStrategy.releaseExclusiveReadLock(operations, file, exchange); |
| } |
| |
| deleteLocalWorkFile(exchange); |
| } |
| |
| public void rollback(GenericFileOperations<T> operations, GenericFileEndpoint<T> endpoint, Exchange exchange, GenericFile<T> file) throws Exception { |
| if (exclusiveReadLockStrategy != null) { |
| exclusiveReadLockStrategy.releaseExclusiveReadLock(operations, file, exchange); |
| } |
| |
| deleteLocalWorkFile(exchange); |
| } |
| |
| public GenericFileExclusiveReadLockStrategy<T> getExclusiveReadLockStrategy() { |
| return exclusiveReadLockStrategy; |
| } |
| |
| public void setExclusiveReadLockStrategy(GenericFileExclusiveReadLockStrategy<T> exclusiveReadLockStrategy) { |
| this.exclusiveReadLockStrategy = exclusiveReadLockStrategy; |
| } |
| |
| protected GenericFile<T> renameFile(GenericFileOperations<T> operations, GenericFile<T> from, GenericFile<T> to) throws IOException { |
| // deleting any existing files before renaming |
| try { |
| operations.deleteFile(to.getAbsoluteFilePath()); |
| } catch (GenericFileOperationFailedException e) { |
| // ignore the file does not exists |
| } |
| |
| // make parent folder if missing |
| boolean mkdir = operations.buildDirectory(to.getParent(), to.isAbsolute()); |
| |
| if (!mkdir) { |
| throw new GenericFileOperationFailedException("Cannot create directory: " + to.getParent() + " (could be because of denied permissions)"); |
| } |
| |
| log.debug("Renaming file: {} to: {}", from, to); |
| boolean renamed = operations.renameFile(from.getAbsoluteFilePath(), to.getAbsoluteFilePath()); |
| if (!renamed) { |
| throw new GenericFileOperationFailedException("Cannot rename file: " + from + " to: " + to); |
| } |
| |
| return to; |
| } |
| |
| private void deleteLocalWorkFile(Exchange exchange) { |
| // delete local work file, if it was used (eg by ftp component) |
| File local = exchange.getIn().getHeader(Exchange.FILE_LOCAL_WORK_PATH, File.class); |
| if (local != null && local.exists()) { |
| boolean deleted = FileUtil.deleteFile(local); |
| log.trace("Local work file: {} was deleted: {}", local, deleted); |
| } |
| } |
| } |
| |