org.jdiameter.api.app.StateMachine Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of jdiameter-api Show documentation
The newest version!
 /*
  * TeleStax, Open Source Cloud Communications
  * Copyright 2011-2016, TeleStax Inc. and individual contributors
  * by the @authors tag.
  *
  * This program is free software: you can redistribute it and/or modify
  * under the terms of the GNU Affero General Public License as
  * published by the Free Software Foundation; either version 3 of
  * the License, or (at your option) any later version.
  *
  * This program 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.  See the
  * GNU Affero General Public License for more details.
  *
  * You should have received a copy of the GNU Affero General Public License
  * along with this program.  If not, see 
  *
  * This file incorporates work covered by the following copyright and
  * permission notice:
  *
  *   JBoss, Home of Professional Open Source
  *   Copyright 2007-2011, Red Hat, Inc. and individual contributors
  *   by the @authors tag. See the copyright.txt in the distribution for a
  *   full listing of individual contributors.
  *
  *   This is free software; you can redistribute it and/or modify it
  *   under the terms of the GNU Lesser General Public License as
  *   published by the Free Software Foundation; either version 2.1 of
  *   the License, or (at your option) any later version.
  *
  *   This software 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. See the GNU
  *   Lesser General Public License for more details.
  *
  *   You should have received a copy of the GNU Lesser General Public
  *   License along with this software; if not, write to the Free
  *   Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  *   02110-1301 USA, or see the FSF site: http://www.fsf.org.
  */

package org.jdiameter.api.app;

import org.jdiameter.api.InternalException;
import org.jdiameter.api.OverloadException;

/**
 * The StateMachine lets you organize event handling,
 * if the order of the events are important to you.
 *
 * @version 1.5.1 Final
 *
 * @author [email protected]
 * @author  Alexandre Mendonca 
 * @author  Bartosz Baranowski 
 */
public interface StateMachine {

  /**
   * Add a new state change listener
   * @param listener a reference to the listener that will get information about state changes.
   */
  void addStateChangeNotification(StateChangeListener listener);

  /**
   * Remove a state change listener
   * @param listener a reference to the listener that will get information about state changes.
   */
  void removeStateChangeNotification(StateChangeListener listener);

  /**
   * Handle an event in the current state.
   * @param event processing event
   * @return true if staterocessed
   * @throws OverloadException if queue of state mashine is full
   * @throws InternalException if FSM has internal error
   */
  boolean handleEvent(StateEvent event) throws InternalException, OverloadException;

  /**
   * Get the current state
   * @param stateType type of state
   * @return current state
   */
   E getState(Class stateType);
}