/**
* Copyright (C) 2004 Orbeon, Inc.
*
* This program is free software; you can redistribute it and/or modify it under the terms of the
* GNU Lesser General Public License as published by the Free Software Foundation; either version
* 2.1 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU Lesser General Public License for more details.
*
* The full text of the license is available at http://www.gnu.org/copyleft/lesser.html
*/
package org.orbeon.oxf.util.task;
import java.io.*;
/**
* Implementation of TaskPersistStrategy to a file system.
* @author Efraim Berkovich
* @version 1.0
*/
public class FilePersistStrategy
implements TaskPersistStrategy {
protected String TASK_FILE_EXT = ".task";
// instance variables
private File persistStorage;
private TaskFileFilter taskFileFilter;
protected FilePersistStrategy() {
}
/**
* Create the strategy. Set the directory which is our persistent storage.
* @param directory The directory to which to write the files.
* @exception IOException if the passed File is not a directory
*/
public FilePersistStrategy(File directory)
throws IOException {
this.init(directory);
}
protected void init(File directory)
throws IOException {
persistStorage = directory;
if (!persistStorage.isDirectory())
throw new IOException("Expected a directory: " + directory.getPath());
taskFileFilter = new TaskFileFilter();
}
/**
* filters to .task files
*/
private class TaskFileFilter implements FilenameFilter {
public boolean accept(File dir, String name) {
if (name.endsWith(TASK_FILE_EXT))
return true;
else
return false;
}
}
/**
* Read all the tasks in persisted storage
* @exception IOException on file issues
* @exception ClassNotFoundException on bad file
*/
public Task[] readAll()
throws IOException
, ClassNotFoundException {
synchronized (this) {
ObjectInputStream inStream;
FileInputStream file;
File[] taskFiles = persistStorage.listFiles(taskFileFilter);
Task[] tasks = new Task[taskFiles.length];
for (int i = 0; i < taskFiles.length; i++) {
file = new FileInputStream(taskFiles[i]);
inStream = new ObjectInputStream(file);
tasks[i] = (Task) inStream.readObject();
inStream.close();
file.close();
}
return tasks;
}
}
/**
* Write the task
* @param task The Task to write
*
*/
public void write(Task task)
throws IOException {
synchronized (this) {
ObjectOutputStream outStream;
FileOutputStream file;
String fileName = new String(persistStorage.getPath()
+ File.separator
+ task.getID()
+ TASK_FILE_EXT);
file = new FileOutputStream(fileName);
outStream = new ObjectOutputStream(file);
outStream.writeObject(task);
outStream.close();
}
}
/**
* Delete the task
*/
public void delete(Task task) {
synchronized (this) {
String fileName = new String(persistStorage.getPath()
+ File.separator
+ task.getID()
+ TASK_FILE_EXT);
File file = new File(fileName);
file.delete();
}
}
/**
* Clear all tasks
*/
public void deleteAll() {
synchronized (this) {
File[] taskFiles = persistStorage.listFiles(taskFileFilter);
for (int i = 0; i < taskFiles.length; i++) {
taskFiles[i].delete();
}
}
}
}