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//
// ========================================================================
// Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
//
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
//
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
//
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
//
package org.eclipse.jetty.util.component;
import java.util.concurrent.CopyOnWriteArrayList;
import org.eclipse.jetty.util.log.Log;
import org.eclipse.jetty.util.log.Logger;
/**
* Basic implementation of the life cycle interface for components.
*
*
*/
public abstract class AbstractLifeCycle implements LifeCycle
{
private static final Logger LOG = Log.getLogger(AbstractLifeCycle.class);
public static final String STOPPED="STOPPED";
public static final String FAILED="FAILED";
public static final String STARTING="STARTING";
public static final String STARTED="STARTED";
public static final String STOPPING="STOPPING";
public static final String RUNNING="RUNNING";
private final Object _lock = new Object();
private final int __FAILED = -1, __STOPPED = 0, __STARTING = 1, __STARTED = 2, __STOPPING = 3;
private volatile int _state = __STOPPED;
protected final CopyOnWriteArrayList<LifeCycle.Listener> _listeners=new CopyOnWriteArrayList<LifeCycle.Listener>();
protected void doStart() throws Exception
{
}
protected void doStop() throws Exception
{
}
public final void start() throws Exception
{
synchronized (_lock)
{
try
{
if (_state == __STARTED || _state == __STARTING)
return;
setStarting();
doStart();
setStarted();
}
catch (Exception e)
{
setFailed(e);
throw e;
}
catch (Error e)
{
setFailed(e);
throw e;
}
}
}
public final void stop() throws Exception
{
synchronized (_lock)
{
try
{
if (_state == __STOPPING || _state == __STOPPED)
return;
setStopping();
doStop();
setStopped();
}
catch (Exception e)
{
setFailed(e);
throw e;
}
catch (Error e)
{
setFailed(e);
throw e;
}
}
}
public boolean isRunning()
{
final int state = _state;
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;
}
public void addLifeCycleListener(LifeCycle.Listener listener)
{
_listeners.add(listener);
}
public void removeLifeCycleListener(LifeCycle.Listener listener)
{
_listeners.remove(listener);
}
public String getState()
{
switch(_state)
{
case __FAILED: return FAILED;
case __STARTING: return STARTING;
case __STARTED: return STARTED;
case __STOPPING: return STOPPING;
case __STOPPED: return STOPPED;
}
return null;
}
public static String getState(LifeCycle lc)
{
if (lc.isStarting()) return STARTING;
if (lc.isStarted()) return STARTED;
if (lc.isStopping()) return STOPPING;
if (lc.isStopped()) return STOPPED;
return FAILED;
}
private void setStarted()
{
_state = __STARTED;
LOG.debug(STARTED+" {}",this);
for (Listener listener : _listeners)
listener.lifeCycleStarted(this);
}
private void setStarting()
{
LOG.debug("starting {}",this);
_state = __STARTING;
for (Listener listener : _listeners)
listener.lifeCycleStarting(this);
}
private void setStopping()
{
LOG.debug("stopping {}",this);
_state = __STOPPING;
for (Listener listener : _listeners)
listener.lifeCycleStopping(this);
}
private void setStopped()
{
_state = __STOPPED;
LOG.debug("{} {}",STOPPED,this);
for (Listener listener : _listeners)
listener.lifeCycleStopped(this);
}
private void setFailed(Throwable th)
{
_state = __FAILED;
LOG.warn(FAILED+" " + this+": "+th,th);
for (Listener listener : _listeners)
listener.lifeCycleFailure(this,th);
}
public static abstract class AbstractLifeCycleListener implements LifeCycle.Listener
{
public void lifeCycleFailure(LifeCycle event, Throwable cause) {}
public void lifeCycleStarted(LifeCycle event) {}
public void lifeCycleStarting(LifeCycle event) {}
public void lifeCycleStopped(LifeCycle event) {}
public void lifeCycleStopping(LifeCycle event) {}
}
}
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