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Guava is a suite of core and expanded libraries that include utility classes, google's collections, io classes, and much much more. Guava has only one code dependency - javax.annotation, per the JSR-305 spec.

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/*
 * Copyright (C) 2011 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;

import com.google.common.annotations.Beta;

import java.util.concurrent.Callable;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;

/**
 * A {@link ScheduledExecutorService} that returns {@link ListenableFuture}
 * instances from its {@code ExecutorService} methods. To create an instance
 * from an existing {@link ScheduledExecutorService}, call
 * {@link MoreExecutors#listeningDecorator(ScheduledExecutorService)}.
 *
 * @author Chris Povirk
 * @since 10.0
 */
@Beta
public interface ListeningScheduledExecutorService
    extends ScheduledExecutorService, ListeningExecutorService {

  /** @since 15.0 (previously returned ScheduledFuture) */
  @Override
  ListenableScheduledFuture schedule(
      Runnable command, long delay, TimeUnit unit);

  /** @since 15.0 (previously returned ScheduledFuture) */
  @Override
   ListenableScheduledFuture schedule(
      Callable callable, long delay, TimeUnit unit);

  /** @since 15.0 (previously returned ScheduledFuture) */
  @Override
  ListenableScheduledFuture scheduleAtFixedRate(
      Runnable command, long initialDelay, long period, TimeUnit unit);

  /** @since 15.0 (previously returned ScheduledFuture) */
  @Override
  ListenableScheduledFuture scheduleWithFixedDelay(
      Runnable command, long initialDelay, long delay, TimeUnit unit);
}