SingleThreadRequestExecutor.java Source code

Java tutorial

Introduction

Here is the source code for SingleThreadRequestExecutor.java

Source

/**
 * 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);
    }

}