/*
 * Copyright 2008-2026 Async-IO.org
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package org.atmosphere.util;

import java.util.Collection;
import java.util.List;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

/**
 * An {@link ExecutorService} that does nothing and execute using the calling Thread.
 */
public class VoidExecutorService implements ExecutorService {

    public final static VoidExecutorService VOID = new VoidExecutorService();

    @Override
    public void shutdown() {
    }

    @Override
    public List<Runnable> shutdownNow() {
        return null;
    }

    @Override
    public boolean isShutdown() {
        return false;
    }

    @Override
    public boolean isTerminated() {
        return false;
    }

    @Override
    public boolean awaitTermination(long l, TimeUnit timeUnit) throws InterruptedException {
        return false;
    }

    @Override
    public <T> Future<T> submit(Callable<T> tCallable) {
        try {
            tCallable.call();
        } catch (Exception e) {
        }
        return null;
    }

    @Override
    public <T> Future<T> submit(Runnable runnable, T t) {
        runnable.run();
        return null;
    }

    @Override
    public Future<?> submit(Runnable runnable) {
        runnable.run();
        return null;
    }

    @Override
    public <T> List<Future<T>> invokeAll(Collection<? extends Callable<T>> callables) throws InterruptedException {
        throw new UnsupportedOperationException();
    }

    @Override
    public <T> List<Future<T>> invokeAll(Collection<? extends Callable<T>> callables, long l, TimeUnit timeUnit) throws InterruptedException {
        throw new UnsupportedOperationException();
    }

    @Override
    public <T> T invokeAny(Collection<? extends Callable<T>> callables) throws InterruptedException, ExecutionException {
        throw new UnsupportedOperationException();
    }

    @Override
    public <T> T invokeAny(Collection<? extends Callable<T>> callables, long l, TimeUnit timeUnit) throws InterruptedException, ExecutionException, TimeoutException {
        throw new UnsupportedOperationException();
    }

    @Override
    public void execute(Runnable runnable) {
        runnable.run();
    }
}
