driver-core/src/main/java/com/datastax/driver/core/SimpleFuture.java

/*
 *      Copyright (C) 2012 DataStax Inc.
 *
 *   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.datastax.driver.core;

import com.google.common.util.concurrent.AbstractFuture;

/**
 * A simple future that can be set to a value.
 *
 * Note that this is equivalent to a Guava SettableFuture, but that the latter
 *  is a final class.
 */
class SimpleFuture<V> extends AbstractFuture<V> {

  /**
   * Creates a new {@code SimpleFuture}.
   */
  static <V> SimpleFuture<V> create() {
    return new SimpleFuture<V>();
  }

  protected SimpleFuture() {}

  /**
   * Sets the value of this future.  This method will return {@code true} if
   * the value was successfully set, or {@code false} if the future has already
   * been set or cancelled.
   *
   * @param value the value the future should hold.
   * @return true if the value was successfully set.
   */
  @Override
  public boolean set(V value) {
    return super.set(value);
  }

  /**
   * Sets the future to having failed with the given exception. This exception
   * will be wrapped in an {@code ExecutionException} and thrown from the {@code
   * get} methods. This method will return {@code true} if the exception was
   * successfully set, or {@code false} if the future has already been set or
   * cancelled.
   *
   * @param throwable the exception the future should hold.
   * @return true if the exception was successfully set.
   */
  @Override
  public boolean setException(Throwable throwable) {
    return super.setException(throwable);
  }
}