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/*
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you 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.apache.directory.daemon;


import org.slf4j.Logger;
import org.slf4j.LoggerFactory;


/**
 * The bootstrapper used by the jsvc process manager.
 * 
 * @author Apache Directory Project
 * @version $Rev: 434416 $
 */
public class JsvcBootstrapper extends Bootstrapper
{
    private final static Logger log = LoggerFactory.getLogger( JsvcBootstrapper.class );
    private boolean isListenerShuttingDown = false;
    private boolean isDaemonShuttingDown = false;
    private Thread thread;


    public void init( String[] args )
    {
        if ( log.isDebugEnabled() )
        {
            StringBuffer buf = new StringBuffer();
            buf.append( "init(String[]) called with args: \n" );
            for ( int ii = 0; ii < args.length; ii++ )
            {
                buf.append( "\t" ).append( args[ii] ).append( "\n" );
            }
            log.debug( buf.toString() );
        }

        setInstallationLayout( args[0] );
        setParentLoader( Thread.currentThread().getContextClassLoader() );
        callInit( shift( args, 1 ) );
        thread = new Thread( new ShutdownListener(), "ShutdownListenerThread" );
    }


    public void start()
    {
        log.debug( "start() called" );
        callStart();
        thread.start();
    }


    public void stop() throws Exception
    {
        log.debug( "stop() called using regular shutdown with signals" );

        // Bad construct here since there is no synchronization but there is
        // no really good way to do this with the way threads are setup.  So
        // both the listener thread and the daemon thread may try to shutdown
        // the server.  It's possible that both will try at the same time in
        // which case there may be issues.  However the chances of this are 
        // very small.  For all practical purposes this will work just fine.
        // And so what if they try to shutdown at the same time.  One thread
        // will just get an exception due to a DeadContext.

        if ( !isListenerShuttingDown )
        {
            isDaemonShuttingDown = true;
            callStop( EMPTY_STRARRAY );
        }
    }


    public void destroy()
    {
        log.debug( "destroy() called" );
        callDestroy();
    }

    class ShutdownListener implements Runnable
    {
        public void run()
        {
            waitForShutdown();
            log.debug( "ShutdownListener came out of waitForShutdown" );
            if ( !isDaemonShuttingDown )
            {
                isListenerShuttingDown = true;
                log.debug( "ShutdownListener will invoke callStop(String[])." );
                callStop( EMPTY_STRARRAY );
                log.debug( "ShutdownListener will invoke callDestroy()." );
                callDestroy();
                log.debug( "ShutdownListener will exit the system." );
                System.exit( 0 );
            }
        }
    }
}