Single Thread Request Executor : Concurrent « Threads « Java

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Java » Threads » ConcurrentScreenshots 
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);
  }

}

   
    
    
    
    
    
    
    
  
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