Package com.caucho.server.dispatch

Source Code of com.caucho.server.dispatch.VersionInvocation

/*
* Copyright (c) 1998-2011 Caucho Technology -- all rights reserved
*
* This file is part of Resin(R) Open Source
*
* Each copy or derived work must preserve the copyright notice and this
* notice unmodified.
*
* Resin Open Source is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Resin Open Source 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, or any warranty
* of NON-INFRINGEMENT.  See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with Resin Open Source; if not, write to the
*
*   Free Software Foundation, Inc.
*   59 Temple Place, Suite 330
*   Boston, MA 02111-1307  USA
*
* @author Scott Ferguson
*/

package com.caucho.server.dispatch;

import com.caucho.server.webapp.WebApp;
import com.caucho.server.session.SessionManager;
import com.caucho.server.http.HttpServletRequestImpl;
import com.caucho.util.L10N;
import com.caucho.util.Alarm;
import com.caucho.vfs.Dependency;

import java.util.logging.Logger;

/**
* A repository for request information gleaned from the uri.
*/
public class VersionInvocation extends Invocation
{
  static final L10N L = new L10N(Invocation.class);
  private static final Logger log
    = Logger.getLogger(Invocation.class.getName());

  private final Invocation _invocation;
  private final WebApp _webApp;

  private final Invocation _oldInvocation;
  private final WebApp _oldWebApp;

  private final long _expireTime;

  public VersionInvocation(Invocation invocation, WebApp webApp,
                           Invocation oldInvocation, WebApp oldWebApp,
                           long expireTime)
  {
    _invocation = invocation;
    _webApp = webApp;

    setWebApp(webApp);
   
    _oldInvocation = oldInvocation;
    _oldWebApp = oldWebApp;

    _expireTime = expireTime;
  }

  /**
   * Returns true if the invocation has been modified.  Generally only
   * true if the webApp has been modified.
   */
  @Override
  public boolean isModified()
  {
    long now = Alarm.getCurrentTime();

    if (_expireTime < now)
      return true;
    else
      return _invocation.isModified() || _oldInvocation.isModified();
  }

  /**
   * Log the reason for modification.
   */
  @Override
  public boolean logModified(Logger log)
  {
    long now = Alarm.getCurrentTime();
   
    if (_expireTime < now) {
      log.info(L.l("{0}: versioning rollover complete.", _webApp));

      return true;
    }
    else
      return _invocation.logModified(log) || _oldInvocation.logModified(log);
  }

  /**
   * Returns the versioned invocation based on this request.
   *
   * @param request the servlet request
   */
  @Override
  public Invocation getRequestInvocation(HttpServletRequestImpl request)
  {
    if (_expireTime < Alarm.getCurrentTime()) {
      return _invocation;
    }

    request.setInvocation(this);
    String sessionId = request.getRequestedSessionId();

    if (sessionId == null)
      sessionId = _invocation.getSessionId();

    if (sessionId == null)
      return _invocation;

    SessionManager oldSessionManager = _oldWebApp.getSessionManager();

    if (oldSessionManager != null
        && oldSessionManager.containsSession(sessionId)) {
      return _oldInvocation;
    }
    else {
      return _invocation;
    }
  }

  /**
   * Returns the invocation's hash code.
   */
  public int hashCode()
  {
    return _invocation.hashCode();
  }

  /**
   * Checks for equality
   */
  public boolean equals(Object o)
  {
    return _invocation.equals(o);
  }
}
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