/*
 * Copyright 2015-present Open Networking Laboratory
 *
 * 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.onlab.junit;

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

/**
 * A scheduled executor service that does not do any of the work scheduled to it.
 * <p>
 * This is useful for testing when you want to disable a background scheduled
 * task.
 * </p>
 */
public class NullScheduledExecutor implements ScheduledExecutorService {
    @Override
    public ScheduledFuture<?> schedule(Runnable command, long delay,
                                       TimeUnit unit) {
        return null;
    }

    @Override
    public <V> ScheduledFuture<V> schedule(Callable<V> callable, long delay,
                                           TimeUnit unit) {
        return null;
    }

    @Override
    public ScheduledFuture<?> scheduleAtFixedRate(Runnable command,
                                                  long initialDelay,
                                                  long period, TimeUnit unit) {
        return null;
    }

    @Override
    public ScheduledFuture<?> scheduleWithFixedDelay(Runnable command,
                                                     long initialDelay,
                                                     long delay,
                                                     TimeUnit unit) {
        return null;
    }

    @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 timeout, TimeUnit unit)
            throws InterruptedException {
        return false;
    }

    @Override
    public <T> Future<T> submit(Callable<T> task) {
        return null;
    }

    @Override
    public <T> Future<T> submit(Runnable task, T result) {
        return null;
    }

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

    @Override
    public <T> List<Future<T>> invokeAll(
            Collection<? extends Callable<T>> tasks)
            throws InterruptedException {
        return null;
    }

    @Override
    public <T> List<Future<T>> invokeAll(
            Collection<? extends Callable<T>> tasks, long timeout,
            TimeUnit unit) throws InterruptedException {
        return null;
    }

    @Override
    public <T> T invokeAny(Collection<? extends Callable<T>> tasks)
            throws InterruptedException, ExecutionException {
        return null;
    }

    @Override
    public <T> T invokeAny(Collection<? extends Callable<T>> tasks,
                           long timeout, TimeUnit unit)
            throws InterruptedException, ExecutionException, TimeoutException {
        return null;
    }

    @Override
    public void execute(Runnable command) {

    }
}