/*
    * Copyright (C) 2007-2012 Argeo GmbH
    *
    * 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 org.argeo.slc.jsch;
  
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  import org.springframework.beans.factory.DisposableBean;
  import org.springframework.beans.factory.InitializingBean;
  
  import com.jcraft.jsch.Session;
  
  /** Caches a JSCH session in the the ssh target. */
  public class JschContextSession extends AbstractJschTask implements
  		InitializingBean, DisposableBean {
  	private final static Log log = LogFactory.getLog(JschContextSession.class);
  	private Boolean autoconnect = false;
  
  	@Override
  	void run(Session session) {
  		// clear();
  		getSshTarget().setSession(session);
  		if (log.isDebugEnabled())
  			log.debug("Cached SSH context session to " + getSshTarget());
  	}
  
  	public void afterPropertiesSet() throws Exception {
  		// if (log.isDebugEnabled())
  		// log.debug(getClass() + ".afterPropertiesSet(), " + beanName + ", "
  		// + this);
  		if (autoconnect)
  			try {
  				run();
  			} catch (Exception e) {
  				log.error("Could not automatically open session", e);
  			}
  	}
  
  	public void destroy() throws Exception {
  		clear();
  	}
  
  	public void clear() {
  		SshTarget sshTarget = getSshTarget();
  		synchronized (sshTarget) {
  			if (sshTarget.getSession() != null) {
  				sshTarget.getSession().disconnect();
  				sshTarget.setSession(null);
  				if (log.isDebugEnabled())
  					log.debug("Cleared cached SSH context session to "
  							+ getSshTarget());
  			}
  		}
  	}
  
  	public void setAutoconnect(Boolean autoconnect) {
  		this.autoconnect = autoconnect;
  	}
  
  }