content: /*
   * 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 org.apache.activemq.artemis.utils;
  
  import java.util.concurrent.CountDownLatch;
  import java.util.concurrent.ExecutionException;
  import java.util.concurrent.TimeUnit;
  import java.util.concurrent.TimeoutException;
  
  public class SimpleFutureImpl<V> implements SimpleFuture<V> {
  
     public SimpleFutureImpl() {
     }
  
     V value;
     Throwable exception;
  
     private final CountDownLatch latch = new CountDownLatch(1);
  
     boolean canceled = false;
  
     @Override
     public boolean cancel(boolean mayInterruptIfRunning) {
        canceled = true;
        latch.countDown();
        return true;
     }
  
     @Override
     public boolean isCancelled() {
        return canceled;
     }
  
     @Override
     public boolean isDone() {
        return latch.getCount() <= 0;
     }
  
     @Override
     public void fail(Throwable e) {
        this.exception = e;
        latch.countDown();
     }
  
     @Override
     public V get() throws InterruptedException, ExecutionException {
        latch.await();
        if (this.exception != null) {
           throw new ExecutionException(this.exception);
        }
        return value;
     }
  
     @Override
     public void set(V v) {
        this.value = v;
        latch.countDown();
     }
  
     @Override
     public V get(long timeout, TimeUnit unit) throws InterruptedException, ExecutionException, TimeoutException {
        latch.await(timeout, unit);
        return value;
     }
  
  }
  