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/*
 * $Id: ServiceLifecycleManager.java 20321 2010-11-24 15:21:24Z dfeist $
 * --------------------------------------------------------------------------------------
 * Copyright (c) MuleSoft, Inc.  All rights reserved.  http://www.mulesoft.com
 *
 * The software in this package is published under the terms of the CPAL v1.0
 * license, a copy of which has been included with this distribution in the
 * LICENSE.txt file.
 */
package org.mule.service;

import org.mule.api.MuleContext;
import org.mule.api.MuleException;
import org.mule.api.construct.FlowConstruct;
import org.mule.api.lifecycle.Disposable;
import org.mule.api.lifecycle.Initialisable;
import org.mule.api.lifecycle.LifecycleCallback;
import org.mule.api.lifecycle.Startable;
import org.mule.api.lifecycle.Stoppable;
import org.mule.api.service.Service;
import org.mule.context.notification.FlowConstructNotification;
import org.mule.context.notification.ServiceNotification;
import org.mule.lifecycle.SimpleLifecycleManager;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * The lifecycle manager responsible for managing lifecycle transitions for a Mule service.  The Mule service adds some additional
 * states, namely pause and resume.  The lifecycle manager manages lifecycle notifications and logging as well.
 */
public class ServiceLifecycleManager extends SimpleLifecycleManager
{
    /**
     * logger used by this class
     */
    protected transient final Log logger = LogFactory.getLog(ServiceLifecycleManager.class);
    protected MuleContext muleContext;

    public ServiceLifecycleManager(FlowConstruct service, MuleContext muleContext) throws MuleException
    {
        super(service.getName(), service);
        this.muleContext = muleContext;
    }

    @Override
    protected void registerTransitions()
    {
        super.registerTransitions();

        //pause resume
        addDirectTransition(Startable.PHASE_NAME, Pausable.PHASE_NAME);
        //Note that 'Resume' state gets removed and the current state is set to 'start'. See {@link #notifyTransition}
        addDirectTransition(Pausable.PHASE_NAME, Resumable.PHASE_NAME);
        addDirectTransition(Pausable.PHASE_NAME, Stoppable.PHASE_NAME);
    }

    @Override
    protected void notifyTransition(String destinationPhase)
    {
        if (destinationPhase.equals(Resumable.PHASE_NAME))
        {
            //Revert back to start phase
            completedPhases.remove(Resumable.PHASE_NAME);
            completedPhases.remove(Pausable.PHASE_NAME);
            setCurrentPhase(Startable.PHASE_NAME);
        }
    }

    @Override
    public void fireInitialisePhase(LifecycleCallback callback) throws MuleException
    {
        checkPhase(Initialisable.PHASE_NAME);
        //TODO No pre notification
        if(logger.isInfoEnabled()) logger.info("Initialising service: " + getLifecycleObject().getName());
        invokePhase(Initialisable.PHASE_NAME, getLifecycleObject(), callback);
        fireNotification(ServiceNotification.SERVICE_INITIALISED);
    }

    @Override
    public void fireStartPhase(LifecycleCallback callback) throws MuleException
    {
        checkPhase(Startable.PHASE_NAME);
        if(logger.isInfoEnabled()) logger.info("Starting service: " + getLifecycleObject().getName());
        //TODO No pre notification
        invokePhase(Startable.PHASE_NAME, getLifecycleObject(), callback);
        fireNotification(ServiceNotification.SERVICE_STARTED);
    }

    public void firePausePhase(LifecycleCallback callback) throws MuleException
    {
        checkPhase(Pausable.PHASE_NAME);
        if(logger.isInfoEnabled()) logger.info("Pausing service: " + getLifecycleObject().getName());

        //TODO No pre notification
        invokePhase(Pausable.PHASE_NAME, getLifecycleObject(), callback);
        fireNotification(ServiceNotification.SERVICE_PAUSED);
    }

    public void fireResumePhase(LifecycleCallback callback) throws MuleException
    {
        checkPhase(Resumable.PHASE_NAME);
        if(logger.isInfoEnabled()) logger.info("Resuming service: " + getLifecycleObject().getName());
        //TODO No pre notification
        invokePhase(Resumable.PHASE_NAME, getLifecycleObject(), callback);
        fireNotification(ServiceNotification.SERVICE_RESUMED);
    }

    @Override
    public void fireStopPhase(LifecycleCallback callback) throws MuleException
    {
        checkPhase(Stoppable.PHASE_NAME);
        if(logger.isInfoEnabled()) logger.info("Stopping service: " + getLifecycleObject().getName());
        //TODO No pre notification
        invokePhase(Stoppable.PHASE_NAME, getLifecycleObject(), callback);
        fireNotification(ServiceNotification.SERVICE_STOPPED);
    }

    @Override
    public void fireDisposePhase(LifecycleCallback callback) throws MuleException
    {
        checkPhase(Disposable.PHASE_NAME);
        if(logger.isInfoEnabled()) logger.info("Disposing service: " + getLifecycleObject().getName());
        //TODO No pre notification
        invokePhase(Disposable.PHASE_NAME, getLifecycleObject(), callback);
        fireNotification(ServiceNotification.SERVICE_DISPOSED);
    }

    protected void fireNotification(int action)
    {
        // double broadcast for backwards compatibility
        muleContext.fireNotification(new FlowConstructNotification(getLifecycleObject(), action));
        if(getLifecycleObject() instanceof Service)
        {
            muleContext.fireNotification(new ServiceNotification((Service)getLifecycleObject(), action));
        }
    }
}