CompletedFuture.java

/*
 * 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 gobblin.util;

import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;

public class CompletedFuture<T> implements Future<T> {
  private final T v;
  private final Throwable re;

  public CompletedFuture(T v, Throwable re) {
    this.v = v;
    this.re = re;
  }

  public boolean cancel(boolean mayInterruptIfRunning) {
    return false;
  }

  public boolean isCancelled() {
    return false;
  }

  public boolean isDone() {
    return true;
  }

  public T get() throws ExecutionException {
    if(this.re != null) {
      throw new ExecutionException(this.re);
    } else {
      return this.v;
    }
  }

  public T get(long timeout, TimeUnit unit) throws ExecutionException {
    return this.get();
  }
}