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Single Thread Request Executor
/**
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
//package org.cspoker.common.util.threading;
import java.util.List;
import java.util.concurrent.AbstractExecutorService;
import java.util.concurrent.Callable;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.TimeUnit;
public class SingleThreadRequestExecutor extends AbstractExecutorService {
private ScheduledExecutorService executor;
private static final SingleThreadRequestExecutor scheduledRequestExecutor = new SingleThreadRequestExecutor();
private SingleThreadRequestExecutor() {
executor = Executors.newSingleThreadScheduledExecutor();
}
public static SingleThreadRequestExecutor getInstance() {
return scheduledRequestExecutor;
}
public boolean awaitTermination(long timeout, TimeUnit unit)
throws InterruptedException {
return executor.awaitTermination(timeout, unit);
}
public boolean isShutdown() {
return executor.isShutdown();
}
public boolean isTerminated() {
return executor.isTerminated();
}
public void shutdown() {
executor.shutdown();
}
public List<Runnable> shutdownNow() {
return executor.shutdownNow();
}
public void execute(final Runnable command) {
executor.execute(new Runnable(){
@Override
public void run() {
try{
command.run();
}catch(Throwable e){
// This normally bad code of catch on Exception is here for a *reason*.
// Future *eats* all exceptions *silently*. This clause at least allows
// the exception to emit noise for debugging. This is particularly pernicious
// if you have something like a NullPointerException
e.printStackTrace();
throw new RuntimeException(e);
}
}
});
}
@Override
public <T> Future<T> submit(final Callable<T> task) {
return executor.submit(new Callable<T>(){
@Override
public T call() throws Exception {
try{
return task.call();
}catch(Throwable e){
// This normally bad code of catch on Exception is here for a *reason*.
// Future *eats* all exceptions *silently*. This clause at least allows
// the exception to emit noise for debugging. This is particularly pernicious
// if you have something like a NullPointerException
e.printStackTrace();
throw new RuntimeException(e);
}
}
});
}
@Override
public Future<?> submit(final Runnable task) {
return executor.submit(new Runnable(){
@Override
public void run() {
try{
task.run();
}catch(Throwable e){
// This normally bad code of catch on Exception is here for a *reason*.
// Future *eats* all exceptions *silently*. This clause at least allows
// the exception to emit noise for debugging. This is particularly pernicious
// if you have something like a NullPointerException
e.printStackTrace();
throw new RuntimeException(e);
}
}
});
}
@Override
public <T> Future<T> submit(final Runnable task, final T result) {
return executor.submit(new Runnable(){
@Override
public void run() {
try{
task.run();
}catch(Throwable e){
// This normally bad code of catch on Exception is here for a *reason*.
// Future *eats* all exceptions *silently*. This clause at least allows
// the exception to emit noise for debugging. This is particularly pernicious
// if you have something like a NullPointerException
e.printStackTrace();
throw new RuntimeException(e);
}
}
}, result);
}
public ScheduledFuture<?> schedule(final Runnable command, long delay,
TimeUnit unit) {
return executor.schedule(new Runnable(){
@Override
public void run() {
try{
command.run();
}catch(Throwable e){
// This normally bad code of catch on Exception is here for a *reason*.
// Future *eats* all exceptions *silently*. This clause at least allows
// the exception to emit noise for debugging. This is particularly pernicious
// if you have something like a NullPointerException
e.printStackTrace();
throw new RuntimeException(e);
}
}
}, delay, unit);
}
public <V> ScheduledFuture<V> schedule(final Callable<V> callable, long delay,
TimeUnit unit) {
return executor.schedule(new Callable<V>(){
@Override
public V call() throws Exception {
try{
return callable.call();
}catch(Throwable e){
// This normally bad code of catch on Exception is here for a *reason*.
// Future *eats* all exceptions *silently*. This clause at least allows
// the exception to emit noise for debugging. This is particularly pernicious
// if you have something like a NullPointerException
e.printStackTrace();
throw new RuntimeException(e);
}
}
}, delay, unit);
}
public ScheduledFuture<?> scheduleAtFixedRate(final Runnable command,
long initialDelay, long period, TimeUnit unit) {
return executor
.scheduleAtFixedRate(new Runnable(){
@Override
public void run() {
try{
command.run();
}catch(Throwable e){
// This normally bad code of catch on Exception is here for a *reason*.
// Future *eats* all exceptions *silently*. This clause at least allows
// the exception to emit noise for debugging. This is particularly pernicious
// if you have something like a NullPointerException
e.printStackTrace();
throw new RuntimeException(e);
}
}
}, initialDelay, period, unit);
}
public ScheduledFuture<?> scheduleWithFixedDelay(final Runnable command,
long initialDelay, long delay, TimeUnit unit) {
return executor.scheduleWithFixedDelay(new Runnable(){
@Override
public void run() {
try{
command.run();
}catch(Throwable e){
// This normally bad code of catch on Exception is here for a *reason*.
// Future *eats* all exceptions *silently*. This clause at least allows
// the exception to emit noise for debugging. This is particularly pernicious
// if you have something like a NullPointerException
e.printStackTrace();
throw new RuntimeException(e);
}
}
}, initialDelay, delay,
unit);
}
}
