| /** |
| * 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; |
| |
| import java.io.File; |
| import java.util.concurrent.locks.Lock; |
| import java.util.concurrent.locks.ReentrantLock; |
| |
| import org.apache.camel.Exchange; |
| import org.apache.camel.Expression; |
| import org.apache.camel.impl.DefaultExchange; |
| import org.apache.camel.impl.DefaultProducer; |
| import org.apache.camel.spi.Language; |
| import org.apache.camel.util.ExchangeHelper; |
| import org.apache.camel.util.FileUtil; |
| import org.apache.camel.util.LRUCache; |
| import org.apache.camel.util.ObjectHelper; |
| import org.apache.camel.util.ServiceHelper; |
| import org.apache.camel.util.StringHelper; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * Generic file producer |
| */ |
| public class GenericFileProducer<T> extends DefaultProducer { |
| protected final transient Logger log = LoggerFactory.getLogger(getClass()); |
| protected final GenericFileEndpoint<T> endpoint; |
| protected GenericFileOperations<T> operations; |
| // assume writing to 100 different files concurrently at most for the same file producer |
| private final LRUCache<String, Lock> locks = new LRUCache<String, Lock>(100); |
| |
| protected GenericFileProducer(GenericFileEndpoint<T> endpoint, GenericFileOperations<T> operations) { |
| super(endpoint); |
| this.endpoint = endpoint; |
| this.operations = operations; |
| } |
| |
| public String getFileSeparator() { |
| return File.separator; |
| } |
| |
| public String normalizePath(String name) { |
| return FileUtil.normalizePath(name); |
| } |
| |
| public void process(Exchange exchange) throws Exception { |
| Exchange fileExchange = endpoint.createExchange(exchange); |
| endpoint.configureExchange(fileExchange); |
| |
| String target = createFileName(exchange); |
| |
| // use lock for same file name to avoid concurrent writes to the same file |
| // for example when you concurrently append to the same file |
| Lock lock; |
| synchronized (locks) { |
| lock = locks.get(target); |
| if (lock == null) { |
| lock = new ReentrantLock(); |
| locks.put(target, lock); |
| } |
| } |
| |
| lock.lock(); |
| try { |
| processExchange(fileExchange, target); |
| ExchangeHelper.copyResults(exchange, fileExchange); |
| } finally { |
| // do not remove as the locks cache has an upper bound |
| // this ensure the locks is appropriate reused |
| lock.unlock(); |
| } |
| } |
| |
| /** |
| * Sets the operations to be used. |
| * <p/> |
| * Can be used to set a fresh operations in case of recovery attempts |
| * |
| * @param operations the operations |
| */ |
| public void setOperations(GenericFileOperations<T> operations) { |
| this.operations = operations; |
| } |
| |
| /** |
| * Perform the work to process the fileExchange |
| * |
| * @param exchange fileExchange |
| * @param target the target filename |
| * @throws Exception is thrown if some error |
| */ |
| protected void processExchange(Exchange exchange, String target) throws Exception { |
| log.trace("Processing file: {} for exchange: {}", target, exchange); |
| |
| try { |
| preWriteCheck(); |
| |
| // should we write to a temporary name and then afterwards rename to real target |
| boolean writeAsTempAndRename = ObjectHelper.isNotEmpty(endpoint.getTempFileName()); |
| String tempTarget = null; |
| // remember if target exists to avoid checking twice |
| Boolean targetExists = null; |
| if (writeAsTempAndRename) { |
| // compute temporary name with the temp prefix |
| tempTarget = createTempFileName(exchange, target); |
| |
| log.trace("Writing using tempNameFile: {}", tempTarget); |
| |
| // cater for file exists option on the real target as |
| // the file operations code will work on the temp file |
| |
| // if an existing file already exists what should we do? |
| targetExists = operations.existsFile(target); |
| if (targetExists) { |
| if (endpoint.getFileExist() == GenericFileExist.Ignore) { |
| // ignore but indicate that the file was written |
| log.trace("An existing file already exists: {}. Ignore and do not override it.", target); |
| return; |
| } else if (endpoint.getFileExist() == GenericFileExist.Fail) { |
| throw new GenericFileOperationFailedException("File already exist: " + target + ". Cannot write new file."); |
| } else if (endpoint.isEagerDeleteTargetFile() && endpoint.getFileExist() == GenericFileExist.Override) { |
| // we override the target so we do this by deleting it so the temp file can be renamed later |
| // with success as the existing target file have been deleted |
| log.trace("Eagerly deleting existing file: {}", target); |
| if (!operations.deleteFile(target)) { |
| throw new GenericFileOperationFailedException("Cannot delete file: " + target); |
| } |
| } |
| } |
| |
| // delete any pre existing temp file |
| if (operations.existsFile(tempTarget)) { |
| log.trace("Deleting existing temp file: {}", tempTarget); |
| if (!operations.deleteFile(tempTarget)) { |
| throw new GenericFileOperationFailedException("Cannot delete file: " + tempTarget); |
| } |
| } |
| } |
| |
| // write/upload the file |
| writeFile(exchange, tempTarget != null ? tempTarget : target); |
| |
| // if we did write to a temporary name then rename it to the real |
| // name after we have written the file |
| if (tempTarget != null) { |
| |
| // if we should not eager delete the target file then do it now just before renaming |
| if (!endpoint.isEagerDeleteTargetFile() && targetExists |
| && endpoint.getFileExist() == GenericFileExist.Override) { |
| // we override the target so we do this by deleting it so the temp file can be renamed later |
| // with success as the existing target file have been deleted |
| log.trace("Deleting existing file: {}", target); |
| if (!operations.deleteFile(target)) { |
| throw new GenericFileOperationFailedException("Cannot delete file: " + target); |
| } |
| } |
| |
| // now we are ready to rename the temp file to the target file |
| log.trace("Renaming file: [{}] to: [{}]", tempTarget, target); |
| boolean renamed = operations.renameFile(tempTarget, target); |
| if (!renamed) { |
| throw new GenericFileOperationFailedException("Cannot rename file from: " + tempTarget + " to: " + target); |
| } |
| } |
| |
| // any done file to write? |
| if (endpoint.getDoneFileName() != null) { |
| String doneFileName = endpoint.createDoneFileName(target); |
| ObjectHelper.notEmpty(doneFileName, "doneFileName", endpoint); |
| |
| // create empty exchange with empty body to write as the done file |
| Exchange empty = new DefaultExchange(exchange); |
| empty.getIn().setBody(""); |
| |
| log.trace("Writing done file: [{}]", doneFileName); |
| // delete any existing done file |
| if (operations.existsFile(doneFileName)) { |
| if (!operations.deleteFile(doneFileName)) { |
| throw new GenericFileOperationFailedException("Cannot delete existing done file: " + doneFileName); |
| } |
| } |
| writeFile(empty, doneFileName); |
| } |
| |
| // lets store the name we really used in the header, so end-users |
| // can retrieve it |
| exchange.getIn().setHeader(Exchange.FILE_NAME_PRODUCED, target); |
| } catch (Exception e) { |
| handleFailedWrite(exchange, e); |
| } |
| |
| postWriteCheck(); |
| } |
| |
| /** |
| * If we fail writing out a file, we will call this method. This hook is |
| * provided to disconnect from servers or clean up files we created (if needed). |
| */ |
| public void handleFailedWrite(Exchange exchange, Exception exception) throws Exception { |
| throw exception; |
| } |
| |
| /** |
| * Perform any actions that need to occur before we write such as connecting to an FTP server etc. |
| */ |
| public void preWriteCheck() throws Exception { |
| // nothing needed to check |
| } |
| |
| /** |
| * Perform any actions that need to occur after we are done such as disconnecting. |
| */ |
| public void postWriteCheck() { |
| // nothing needed to check |
| } |
| |
| public void writeFile(Exchange exchange, String fileName) throws GenericFileOperationFailedException { |
| // build directory if auto create is enabled |
| if (endpoint.isAutoCreate()) { |
| // we must normalize it (to avoid having both \ and / in the name which confuses java.io.File) |
| String name = FileUtil.normalizePath(fileName); |
| |
| // use java.io.File to compute the file path |
| File file = new File(name); |
| String directory = file.getParent(); |
| boolean absolute = FileUtil.isAbsolute(file); |
| if (directory != null) { |
| if (!operations.buildDirectory(directory, absolute)) { |
| log.debug("Cannot build directory [{}] (could be because of denied permissions)", directory); |
| } |
| } |
| } |
| |
| // upload |
| if (log.isTraceEnabled()) { |
| log.trace("About to write [{}] to [{}] from exchange [{}]", new Object[]{fileName, getEndpoint(), exchange}); |
| } |
| |
| boolean success = operations.storeFile(fileName, exchange); |
| if (!success) { |
| throw new GenericFileOperationFailedException("Error writing file [" + fileName + "]"); |
| } |
| log.debug("Wrote [{}] to [{}]", fileName, getEndpoint()); |
| } |
| |
| public String createFileName(Exchange exchange) { |
| String answer; |
| |
| String name = exchange.getIn().getHeader(Exchange.FILE_NAME, String.class); |
| |
| // expression support |
| Expression expression = endpoint.getFileName(); |
| if (name != null) { |
| // the header name can be an expression too, that should override |
| // whatever configured on the endpoint |
| if (StringHelper.hasStartToken(name, "simple")) { |
| log.trace("{} contains a Simple expression: {}", Exchange.FILE_NAME, name); |
| Language language = getEndpoint().getCamelContext().resolveLanguage("file"); |
| expression = language.createExpression(name); |
| } |
| } |
| if (expression != null) { |
| log.trace("Filename evaluated as expression: {}", expression); |
| name = expression.evaluate(exchange, String.class); |
| } |
| |
| // flatten name |
| if (name != null && endpoint.isFlatten()) { |
| // check for both windows and unix separators |
| int pos = Math.max(name.lastIndexOf("/"), name.lastIndexOf("\\")); |
| if (pos != -1) { |
| name = name.substring(pos + 1); |
| } |
| } |
| |
| // compute path by adding endpoint starting directory |
| String endpointPath = endpoint.getConfiguration().getDirectory(); |
| String baseDir = ""; |
| if (endpointPath.length() > 0) { |
| // Its a directory so we should use it as a base path for the filename |
| // If the path isn't empty, we need to add a trailing / if it isn't already there |
| baseDir = endpointPath; |
| boolean trailingSlash = endpointPath.endsWith("/") || endpointPath.endsWith("\\"); |
| if (!trailingSlash) { |
| baseDir += getFileSeparator(); |
| } |
| } |
| if (name != null) { |
| answer = baseDir + name; |
| } else { |
| // use a generated filename if no name provided |
| answer = baseDir + endpoint.getGeneratedFileName(exchange.getIn()); |
| } |
| |
| if (endpoint.getConfiguration().needToNormalize()) { |
| // must normalize path to cater for Windows and other OS |
| answer = normalizePath(answer); |
| } |
| |
| return answer; |
| } |
| |
| public String createTempFileName(Exchange exchange, String fileName) { |
| String answer = fileName; |
| |
| String tempName; |
| if (exchange.getIn().getHeader(Exchange.FILE_NAME) == null) { |
| // its a generated filename then add it to header so we can evaluate the expression |
| exchange.getIn().setHeader(Exchange.FILE_NAME, FileUtil.stripPath(fileName)); |
| tempName = endpoint.getTempFileName().evaluate(exchange, String.class); |
| // and remove it again after evaluation |
| exchange.getIn().removeHeader(Exchange.FILE_NAME); |
| } else { |
| tempName = endpoint.getTempFileName().evaluate(exchange, String.class); |
| } |
| |
| // check for both windows and unix separators |
| int pos = Math.max(answer.lastIndexOf("/"), answer.lastIndexOf("\\")); |
| if (pos == -1) { |
| // no path so use temp name as calculated |
| answer = tempName; |
| } else { |
| // path should be prefixed before the temp name |
| StringBuilder sb = new StringBuilder(answer.substring(0, pos + 1)); |
| sb.append(tempName); |
| answer = sb.toString(); |
| } |
| |
| if (endpoint.getConfiguration().needToNormalize()) { |
| // must normalize path to cater for Windows and other OS |
| answer = normalizePath(answer); |
| } |
| |
| return answer; |
| } |
| |
| @Override |
| protected void doStart() throws Exception { |
| super.doStart(); |
| ServiceHelper.startService(locks); |
| } |
| |
| @Override |
| protected void doStop() throws Exception { |
| ServiceHelper.stopService(locks); |
| super.doStop(); |
| } |
| } |