/*

  * Licensed to the Apache Software Foundation (ASF) under one

  * or more contributor license agreements.  See the NOTICE file

  * distributed with this work for additional information

  * regarding copyright ownership.  The ASF licenses this file

  * to you 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 com.yammer.metrics.core;

 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;

 /**

  * An executor service that does nothing. Used with empty metrics so that no

  * threads are created wasting time / space.

  */

 public class NoOpExecutorService implements ScheduledExecutorService {

   @Override

   public ScheduledFuture<?> schedule(Runnable runnable, long l,

                                      TimeUnit timeUnit) {

     return null;

   }

   @Override

   public <V> ScheduledFuture<V> schedule(Callable<V> vCallable, long l,

                                          TimeUnit timeUnit) {

     return null;

   }

   @Override

   public ScheduledFuture<?> scheduleAtFixedRate(

     Runnable runnable, long l, long l1, TimeUnit timeUnit

   ) {

     return null;

   }

   @Override

   public ScheduledFuture<?> scheduleWithFixedDelay(

     Runnable runnable, long l, long l1, TimeUnit timeUnit

   ) {

     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 l, TimeUnit timeUnit)

     throws InterruptedException {

     return false;

   }

   @Override

   public <T> Future<T> submit(Callable<T> tCallable) {

     return null;

   }

   @Override

   public <T> Future<T> submit(Runnable runnable, T t) {

     return null;

   }

   @Override

   public Future<?> submit(Runnable runnable) {

     return null;

   }

   @Override

   public <T> List<Future<T>> invokeAll(

     Collection<? extends Callable<T>> callables)

     throws InterruptedException {

     return null;

   }

   @Override

   public <T> List<Future<T>> invokeAll(

     Collection<? extends Callable<T>> callables, long l, TimeUnit timeUnit

   ) throws InterruptedException {

     return null;

   }

   @Override

   public <T> T invokeAny(Collection<? extends Callable<T>> callables)

     throws InterruptedException, ExecutionException {

     return null;

   }

   @Override

   public <T> T invokeAny(Collection<? extends Callable<T>> callables, long l,

                          TimeUnit timeUnit)

     throws InterruptedException, ExecutionException, TimeoutException {

     return null;

   }

   @Override

   public void execute(Runnable runnable) {

   }

 }