MemoryUploadListener.java

/*
 * Copyright 2010 Manuel Carrasco Moñino. (manolo at apache/org)
 * http://code.google.com/p/gwtupload
 *
 * Licensed 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 gwtupload.server;


import java.util.Date;
import java.util.HashMap;
import java.util.Map;

/**
 * This File Upload Listener is used by Apache Commons File Upload to
 * monitor the progress of the uploaded file.
 *
 * This Listener saves itself into a unique map in memory.
 * It doesn't work when the application is deployed in cluster.
 *
 * It is thought to be used in systems where session objects
 * are not updated until the request has finished.
 *
 * @author Manolo Carrasco Moñino
 *
 */
public class MemoryUploadListener extends AbstractUploadListener {

  private static final long serialVersionUID = 7395899170157906525L;

  private static final Map<String, MemoryUploadListener>  listeners = new HashMap<String, MemoryUploadListener>();

  public static MemoryUploadListener current(String sessionId) {
    MemoryUploadListener listener = listeners.get(sessionId);
    logger.debug(className + " " + sessionId + " get " + listener);
    return listener;
  }

  public MemoryUploadListener(int sleepMilliseconds, long requestSize) {
    super(sleepMilliseconds, requestSize);
  }

  public void remove() {
    listeners.remove(sessionId);
    logger.info(className + " " + sessionId + " Remove " + this.toString());
    current(sessionId);
  }

  public void save() {
    listeners.put(sessionId, this);
    saved = new Date();
    logger.debug(className + " " + sessionId + " Saved " + this.toString());
  }
}