package org.argeo.cms.internal.http;
   
   import java.io.Serializable;
   import java.util.LinkedHashMap;
   
   import javax.jcr.Repository;
   import javax.jcr.RepositoryException;
   import javax.jcr.Session;
   import javax.servlet.ServletException;
  import javax.servlet.http.HttpServletRequest;
  
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  import org.apache.jackrabbit.server.SessionProvider;
  import org.argeo.cms.internal.auth.CmsSessionImpl;
  import org.argeo.jcr.JcrUtils;
  
  /**
   * Implements an open session in view patter: a new JCR session is created for
   * each request
   */
  public class CmsSessionProvider implements SessionProvider, Serializable {
  	private static final long serialVersionUID = -1358136599534938466L;
  
  	private final static Log log = LogFactory.getLog(CmsSessionProvider.class);
  
  	private final String alias;
  
  	private LinkedHashMap<Session, CmsSessionImpl> cmsSessions = new LinkedHashMap<>();
  
  	public CmsSessionProvider(String alias) {
  		this.alias = alias;
  	}
  
  	public Session getSession(HttpServletRequest request, Repository rep, String workspace)
  			throws javax.jcr.LoginException, ServletException, RepositoryException {
  
  		// a client is scanning parent URLs.
  //		if (workspace == null)
  //			return null;
  
  		CmsSessionImpl cmsSession = WebCmsSessionImpl.getCmsSession(request);
  		if (log.isTraceEnabled()) {
  			log.trace("Get JCR session from " + cmsSession);
  		}
  		if (cmsSession == null)
  			throw new IllegalStateException("Cannot find a session for request " + request.getRequestURI());
  		Session session = cmsSession.getDataSession(alias, workspace, rep);
  		cmsSessions.put(session, cmsSession);
  		return session;
  	}
  
  	public void releaseSession(Session session) {
  //		JcrUtils.logoutQuietly(session);
  		if (cmsSessions.containsKey(session)) {
  			CmsSessionImpl cmsSession = cmsSessions.get(session);
  			cmsSession.releaseDataSession(alias, session);
  		} else {
  			log.warn("JCR session " + session + " not found in CMS session list. Logging it out...");
  			JcrUtils.logoutQuietly(session);
  		}
  	}
  }