org.eclipse.jetty.util.component.Graceful Maven / Gradle / Ivy
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//
// ========================================================================
// Copyright (c) 1995-2019 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.Future;
import java.util.concurrent.atomic.AtomicReference;
import org.eclipse.jetty.util.FutureCallback;
/* ------------------------------------------------------------ */
/* A Lifecycle that can be gracefully shutdown.
*/
public interface Graceful
{
public Future shutdown();
public boolean isShutdown();
public static class Shutdown implements Graceful
{
private final AtomicReference _shutdown=new AtomicReference<>();
protected FutureCallback newShutdownCallback()
{
return FutureCallback.SUCCEEDED;
}
@Override
public Future shutdown()
{
return _shutdown.updateAndGet(fcb->{return fcb==null?newShutdownCallback():fcb;});
}
@Override
public boolean isShutdown()
{
return _shutdown.get()!=null;
}
public void cancel()
{
FutureCallback shutdown = _shutdown.getAndSet(null);
if (shutdown!=null && !shutdown.isDone())
shutdown.cancel(true);
}
public FutureCallback get()
{
return _shutdown.get();
}
}
}