/*
* 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.servicemix.components.vfs;
import org.apache.commons.vfs.FileContent;
import org.apache.commons.vfs.FileObject;
import org.apache.commons.vfs.FileSelector;
import org.apache.commons.vfs.FileSystemManager;
import org.apache.servicemix.components.util.DefaultFileMarshaler;
import org.apache.servicemix.components.util.FileMarshaler;
import org.apache.servicemix.components.util.PollingComponentSupport;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.concurrent.CopyOnWriteArraySet;
import javax.jbi.JBIException;
import javax.jbi.messaging.RobustInOnly;
import javax.jbi.messaging.NormalizedMessage;
import java.io.IOException;
import java.io.InputStream;
import java.util.Set;
/**
* A polling component which looks for a file in a file system using the
* <a href="http://jakarta.apache.org/commons/vfs.html">Jakarta Commons VFS</a> library
* for handling various file systems like files, Samba, WebDAV, FTP, SFTP and temporary files.
*
* @version $Revision$
*/
public class FilePoller extends PollingComponentSupport {
private static final Logger logger = LoggerFactory.getLogger(FilePoller.class);
private FileMarshaler marshaler = new DefaultFileMarshaler();
private FileObjectEditor editor = new FileObjectEditor();
private FileObject directory;
private FileSelector selector;
private Set workingSet = new CopyOnWriteArraySet();
private boolean deleteFile = true;
public void poll() throws Exception {
FileObject[] files = null;
// SM-192: Force close the file, so that the cached informations are cleared
directory.close();
if (selector != null) {
files = directory.findFiles(selector);
}
else {
files = directory.getChildren();
}
for (int i = 0; i < files.length; i++) {
pollFile(files[i]);
}
}
// Properties
//-------------------------------------------------------------------------
public FileObject getDirectory() {
return directory;
}
public void setDirectory(FileObject directory) {
this.directory = directory;
}
public FileSelector getSelector() {
return selector;
}
public void setSelector(FileSelector selector) {
this.selector = selector;
}
public String getPath() {
return editor.getPath();
}
public void setPath(String path) {
editor.setPath(path);
}
/**
* Returns whether or not we should delete the file when its processed
*/
public boolean isDeleteFile() {
return deleteFile;
}
public void setDeleteFile(boolean deleteFile) {
this.deleteFile = deleteFile;
}
public FileSystemManager getFileSystemManager() {
return editor.getFileSystemManager();
}
public void setFileSystemManager(FileSystemManager fileSystemManager) {
editor.setFileSystemManager(fileSystemManager);
}
public FileMarshaler getMarshaler() {
return marshaler;
}
public void setMarshaler(FileMarshaler marshaler) {
this.marshaler = marshaler;
}
/**
* The set of FTPFiles that this component is currently working on
*
* @return
*/
public Set getWorkingSet() {
return workingSet;
}
// Implementation methods
//-------------------------------------------------------------------------
protected void init() throws JBIException {
if (directory == null) {
directory = editor.getFileObject();
}
super.init();
}
protected void pollFile(final FileObject aFile) {
if (workingSet.add(aFile)) {
if (logger.isDebugEnabled()) {
logger.debug("Scheduling file " + aFile + " for processing");
}
getExecutor().execute(new Runnable() {
public void run() {
try {
processFileAndDelete(aFile);
} finally {
workingSet.remove(aFile);
}
}
});
}
}
protected void processFileAndDelete(FileObject file) {
try {
processFile(file);
if (isDeleteFile()) {
if (!file.delete()) {
throw new IOException("Could not delete file " + file);
}
}
}
catch (Exception e) {
logger.error("Failed to process file: " + file + ". Reason: " + e, e);
}
}
protected void processFile(FileObject file) throws Exception {
// SM-192: Force close the file, so that the cached informations are cleared
file.close();
String name = file.getName().getURI();
FileContent content = file.getContent();
content.close();
InputStream in = content.getInputStream();
if (in == null) {
throw new JBIException("No input available for file!");
}
RobustInOnly exchange = getExchangeFactory().createRobustInOnlyExchange();
NormalizedMessage message = exchange.createMessage();
exchange.setInMessage(message);
marshaler.readMessage(exchange, message, in, name);
getDeliveryChannel().sendSync(exchange);
in.close();
content.close();
if (exchange.getError() != null) {
throw exchange.getError();
}
}
}