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Guava testlib is a set of java classes used for more convenient unit testing - particularly to assist the tests for Guava itself.
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/*
 * Copyright (C) 2009 The Guava Authors
 *
 * 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 com.google.common.util.concurrent.testing;

import static com.google.common.util.concurrent.MoreExecutors.newDirectExecutorService;

import com.google.common.base.Preconditions;
import com.google.common.util.concurrent.ForwardingListenableFuture.SimpleForwardingListenableFuture;
import com.google.common.util.concurrent.ListenableFuture;
import com.google.common.util.concurrent.ListenableScheduledFuture;
import com.google.common.util.concurrent.ListeningExecutorService;
import com.google.common.util.concurrent.ListeningScheduledExecutorService;

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

/**
 * A ScheduledExecutorService that executes all scheduled actions immediately
 * in the calling thread.
 *
 * See {@link TestingExecutors#sameThreadScheduledExecutor()} for a full list of
 * constraints.
 *
 * @author John Sirois
 * @author Zach van Schouwen
 */
class SameThreadScheduledExecutorService extends AbstractExecutorService
    implements ListeningScheduledExecutorService {

  private final ListeningExecutorService delegate = newDirectExecutorService();

  @Override
  public void shutdown() {
    delegate.shutdown();
  }

  @Override
  public List shutdownNow() {
    return delegate.shutdownNow();
  }

  @Override
  public boolean isShutdown() {
    return delegate.isShutdown();
  }

  @Override
  public boolean isTerminated() {
    return delegate.isTerminated();
  }

  @Override
  public boolean awaitTermination(long timeout, TimeUnit unit)
      throws InterruptedException {
    Preconditions.checkNotNull(unit, "unit must not be null!");
    return delegate.awaitTermination(timeout, unit);
  }

  @Override
  public  ListenableFuture submit(Callable task) {
    Preconditions.checkNotNull(task, "task must not be null!");
    return delegate.submit(task);
  }

  @Override
  public  ListenableFuture submit(Runnable task, T result) {
    Preconditions.checkNotNull(task, "task must not be null!");
    Preconditions.checkNotNull(result, "result must not be null!");
    return delegate.submit(task, result);
  }

  @Override
  public ListenableFuture submit(Runnable task) {
    Preconditions.checkNotNull(task, "task must not be null!");
    return delegate.submit(task);
  }

  @Override
  public  List> invokeAll(
      Collection> tasks) throws InterruptedException {
    Preconditions.checkNotNull(tasks, "tasks must not be null!");
    return delegate.invokeAll(tasks);
  }

  @Override
  public  List> invokeAll(
      Collection> tasks, long timeout, TimeUnit unit)
      throws InterruptedException {
    Preconditions.checkNotNull(tasks, "tasks must not be null!");
    Preconditions.checkNotNull(unit, "unit must not be null!");
    return delegate.invokeAll(tasks, timeout, unit);
  }

  @Override
  public  T invokeAny(Collection> tasks)
      throws InterruptedException, ExecutionException {
    Preconditions.checkNotNull(tasks, "tasks must not be null!");
    return delegate.invokeAny(tasks);
  }

  @Override
  public  T invokeAny(Collection> tasks,
      long timeout, TimeUnit unit)
      throws InterruptedException, ExecutionException, TimeoutException {
    Preconditions.checkNotNull(tasks, "tasks must not be null!");
    Preconditions.checkNotNull(unit, "unit must not be null!");
    return delegate.invokeAny(tasks, timeout, unit);
  }

  @Override
  public void execute(Runnable command) {
    Preconditions.checkNotNull(command, "command must not be null!");
    delegate.execute(command);
  }

  @Override
  public ListenableScheduledFuture schedule(Runnable command, long delay,
      TimeUnit unit) {
    Preconditions.checkNotNull(command, "command must not be null");
    Preconditions.checkNotNull(unit, "unit must not be null!");
    return schedule(java.util.concurrent.Executors.callable(command),
        delay, unit);
  }

  private static class ImmediateScheduledFuture
      extends SimpleForwardingListenableFuture
      implements ListenableScheduledFuture {
    private ExecutionException exception;

    protected ImmediateScheduledFuture(ListenableFuture future) {
      super(future);
    }

    @Override
    public V get(long timeout, TimeUnit unit)
        throws InterruptedException, ExecutionException, TimeoutException {
      Preconditions.checkNotNull(unit, "unit must not be null!");
      return get();
    }

    @Override
    public long getDelay(TimeUnit unit) {
      Preconditions.checkNotNull(unit, "unit must not be null!");
      return 0;
    }

    @Override
    public int compareTo(Delayed other) {
      Preconditions.checkNotNull(other, "other must not be null!");
      return 0;
    }
  }

  @Override
  public  ListenableScheduledFuture schedule(final Callable callable,
      long delay, TimeUnit unit) {
    Preconditions.checkNotNull(callable, "callable must not be null!");
    Preconditions.checkNotNull(unit, "unit must not be null!");
    ListenableFuture delegateFuture = submit(callable);
    return new ImmediateScheduledFuture(delegateFuture);
  }

  @Override
  public ListenableScheduledFuture scheduleAtFixedRate(Runnable command,
      long initialDelay, long period, TimeUnit unit) {
    throw new UnsupportedOperationException(
        "scheduleAtFixedRate is not supported.");
  }

  @Override
  public ListenableScheduledFuture scheduleWithFixedDelay(Runnable command,
      long initialDelay, long delay, TimeUnit unit) {
    throw new UnsupportedOperationException(
        "scheduleWithFixedDelay is not supported.");
  }
}