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//
// ========================================================================
// Copyright (c) 1995-2016 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.thread;
/**
* Marker that wraps a Runnable, indicating that it is running in a thread that must not be blocked.
* <p />
* Client code can use the thread-local {@link #isNonBlockingThread()} to detect whether they are
* in the context of a non-blocking thread, and perform different actions if that's the case.
*/
public class NonBlockingThread implements Runnable
{
private final static ThreadLocal<Boolean> __nonBlockingThread = new ThreadLocal<>();
/**
* @return whether the current thread is a thread that must not block.
*/
public static boolean isNonBlockingThread()
{
return Boolean.TRUE.equals(__nonBlockingThread.get());
}
private final Runnable delegate;
public NonBlockingThread(Runnable delegate)
{
this.delegate = delegate;
}
@Override
public void run()
{
try
{
__nonBlockingThread.set(Boolean.TRUE);
delegate.run();
}
finally
{
__nonBlockingThread.set(Boolean.FALSE);
}
}
}
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