Jetty example source code file (AbstractLifeCycle.java)

This example Jetty source code file (AbstractLifeCycle.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Jetty tags/keywords

abstractlifecycle, abstractlifecycle, exception, exception, failed=-1,stopped=0,starting=1,started=2,stopping=3, failed=-1,stopped=0,starting=1,started=2,stopping=3, lifecycle, lifecycle

The Jetty AbstractLifeCycle.java source code

//========================================================================
//$Id: AbstractLifeCycle.java,v 1.3 2005/11/11 22:55:41 gregwilkins Exp $
//Copyright 2004-2005 Mort Bay Consulting Pty. Ltd.
//------------------------------------------------------------------------
//Licensed 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.mortbay.component;

import org.mortbay.log.Log;

/**
 * Basic implementation of the life cycle interface for components.
 * @author gregw
 */
public abstract class AbstractLifeCycle implements LifeCycle
{
    private final int FAILED=-1,STOPPED=0,STARTING=1,STARTED=2,STOPPING=3;
    private transient int _state=STOPPED;
    protected void doStart() throws Exception {}
    protected void doStop() throws Exception {}


    public final void start() throws Exception
    {
        try
        {
            if (_state==STARTED)
                return;
            _state=STARTING;
            doStart();
            Log.debug("started {}",this);
            _state=STARTED;
        }
        catch (Exception e)
        {
            Log.warn("failed "+this,e);
            _state=FAILED;
            throw e;
        }
        catch(Error e)
        {
            Log.warn("failed "+this,e);
            _state=FAILED;
            throw e;
        }
    }

    public final void stop() throws Exception
    {
        try
        {
            if (_state==STOPPING || _state==STOPPED)
                return;
            _state=STOPPING;
            doStop();
            Log.debug("stopped {}",this);
            _state=STOPPED;
        }
        catch (Exception e)
        {
            Log.warn("failed "+this,e);
            _state=FAILED;
            throw e;
        }
        catch(Error e)
        {
            Log.warn("failed "+this,e);
            _state=FAILED;
            throw e;
        }
    }

    public boolean isRunning()
    {
        return _state==STARTED || _state==STARTING;
    }

    public boolean isStarted()
    {
        return _state==STARTED;
    }

    public boolean isStarting()
    {
        return _state==STARTING;
    }

    public boolean isStopping()
    {
        return _state==STOPPING;
    }

    public boolean isStopped()
    {
        return _state==STOPPED;
    }

    public boolean isFailed()
    {
        return _state==FAILED;
    }
}