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/**
* Copyright 2015 JogAmp Community. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are
* permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this list of
* conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice, this list
* of conditions and the following disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY JogAmp Community ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JogAmp Community OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* The views and conclusions contained in the software and documentation are those of the
* authors and should not be interpreted as representing official policies, either expressed
* or implied, of JogAmp Community.
*/
package com.jogamp.common.util;
/**
* Interface exposing {@link java.lang.Thread#interrupt()} source,
* intended for {@link java.lang.Thread} specializations.
* @since 2.3.2
*/
public interface InterruptSource {
/**
* Returns the source of the last {@link #interrupt()} call.
* @param clear if true, issues {@link #clearInterruptSource()}
*/
Throwable getInterruptSource(final boolean clear);
/**
* Returns the count of {@link java.lang.Thread#interrupt()} calls.
* @param clear if true, issues {@link #clearInterruptSource()}
*/
int getInterruptCounter(final boolean clear);
/**
* Clears source and count of {@link java.lang.Thread#interrupt()} calls, if any.
*/
void clearInterruptSource();
public static class Util {
/**
* Casts given {@link java.lang.Thread} to {@link InterruptSource}
* if applicable, otherwise returns {@code null}.
*/
public static InterruptSource get(final java.lang.Thread t) {
if(t instanceof InterruptSource) {
return (InterruptSource)t;
} else {
return null;
}
}
/**
* Casts current {@link java.lang.Thread} to {@link InterruptSource}
* if applicable, otherwise returns {@code null}.
*/
public static InterruptSource currentThread() {
return get(java.lang.Thread.currentThread());
}
}
/**
* {@link java.lang.Thread} specialization implementing {@link InterruptSource}
* to track {@link java.lang.Thread#interrupt()} calls.
* @since 2.3.2
*/
public static class Thread extends java.lang.Thread implements InterruptSource {
volatile Throwable interruptSource = null;
volatile int interruptCounter = 0;
final Object sync = new Object();
/**
* See {@link Thread#Thread(} for details.
*/
public Thread() {
super();
}
/**
* See {@link Thread#Thread(ThreadGroup, Runnable)} for details.
* @param tg explicit {@link ThreadGroup}, may be {@code null}
* @param target explicit {@link Runnable}, may be {@code null}
*/
public Thread(final ThreadGroup tg, final Runnable target) {
super(tg, target);
}
/**
* See {@link Thread#Thread(ThreadGroup, Runnable, String)} for details.
* @param tg explicit {@link ThreadGroup}, may be {@code null}
* @param target explicit {@link Runnable}, may be {@code null}
* @param name explicit name of thread, must not be {@code null}
*/
public Thread(final ThreadGroup tg, final Runnable target, final String name) {
super(tg, target, name);
}
/**
* Depending on whether {@code name} is null, either
* {@link #Thread(ThreadGroup, Runnable, String)} or
* {@link #Thread(ThreadGroup, Runnable)} is being utilized.
* @param tg explicit {@link ThreadGroup}, may be {@code null}
* @param target explicit {@link Runnable}, may be {@code null}
* @param name explicit name of thread, may be {@code null}
*/
public static Thread create(final ThreadGroup tg, final Runnable target, final String name) {
return null != name ? new Thread(tg, target, name) : new Thread(tg, target);
}
@Override
public final Throwable getInterruptSource(final boolean clear) {
synchronized(sync) {
final Throwable r = interruptSource;
if( clear ) {
clearInterruptSource();
}
return r;
}
}
@Override
public final int getInterruptCounter(final boolean clear) {
synchronized(sync) {
final int r = interruptCounter;
if( clear ) {
clearInterruptSource();
}
return r;
}
}
@Override
public final void clearInterruptSource() {
synchronized(sync) {
interruptCounter = 0;
interruptSource = null;
}
}
@Override
public final void interrupt() {
synchronized(sync) {
interruptCounter++;
interruptSource = new Throwable(getName()+".interrupt() #"+interruptCounter);
}
super.interrupt();
}
}
}
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