/*
* Copyright 2008 Federal Chancellery Austria and
* Graz University of Technology
*
* 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 at.gv.egiz.bku.online.webapp;

import javax.servlet.http.HttpSessionEvent;
import javax.servlet.http.HttpSessionListener;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import at.gv.egiz.bku.binding.BindingProcessorManager;
import at.gv.egiz.bku.binding.Id;
import at.gv.egiz.bku.binding.IdFactory;

/**
 * Session listener to trigger the removal of the BindingProcessor
 *
 */
public class SessionListener implements HttpSessionListener {
  
  private final Logger log = LoggerFactory.getLogger(SessionListener.class);

  @Override
  public void sessionCreated(HttpSessionEvent event) {
    log.info("Session {} created.", event.getSession().getId());
    event.getSession().setAttribute(TransactionId.TRANSACTION_INDEX, new TransactionId());
  }

  @Override
  public void sessionDestroyed(HttpSessionEvent event) {
    BindingProcessorManager manager = (BindingProcessorManager) event.getSession().getServletContext().getAttribute("bindingProcessorManager");
    TransactionId tidx = (TransactionId) event.getSession().getAttribute(TransactionId.TRANSACTION_INDEX);
    if (tidx != null) {
      IdFactory idFactory = IdFactory.getInstance();
      for (int i = 0; i <= tidx.get(); i++) {
        Id id = idFactory.createId(event.getSession().getId() + "-" + i);
        manager.removeBindingProcessor(id);
      }
    }
    log.info("Session {} destroyed.", event.getSession().getId());
  }

}