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.kafka.connect.util;
  
  import java.util.concurrent.CountDownLatch;
  import java.util.concurrent.ExecutionException;
  import java.util.concurrent.Future;
  import java.util.concurrent.TimeUnit;
  import java.util.concurrent.TimeoutException;
  
  public class TestFuture<T> implements Future<T> {
      private volatile boolean resolved;
      private T result;
      private Throwable exception;
      private final CountDownLatch getCalledLatch;
  
      public TestFuture() {
          resolved = false;
          getCalledLatch = new CountDownLatch(1);
      }
  
      public void resolve(T val) {
          this.result = val;
          resolved = true;
          synchronized (this) {
              this.notifyAll();
          }
      }
  
      public void resolve(Throwable t) {
          exception = t;
          resolved = true;
          synchronized (this) {
              this.notifyAll();
          }
      }
  
      @Override
      public boolean cancel(boolean mayInterruptIfRunning) {
          return false;
      }
  
      @Override
      public boolean isCancelled() {
          return false;
      }
  
      @Override
      public boolean isDone() {
          return resolved;
      }
  
      @Override
      public T get() throws InterruptedException, ExecutionException {
          getCalledLatch.countDown();
          while (true) {
              try {
                  return get(Integer.MAX_VALUE, TimeUnit.DAYS);
              } catch (TimeoutException e) {
                  // ignore
              }
          }
      }
  
      @Override
      public T get(long timeout, TimeUnit unit) throws InterruptedException, ExecutionException, TimeoutException {
          getCalledLatch.countDown();
  
          synchronized (this) {
              while (!resolved) {
                  this.wait(TimeUnit.MILLISECONDS.convert(timeout, unit));
              }
          }
  
          if (exception != null) {
              if (exception instanceof TimeoutException)
                  throw (TimeoutException) exception;
              else if (exception instanceof InterruptedException)
                  throw (InterruptedException) exception;
              else
                  throw new ExecutionException(exception);
          }
          return result;
      }
  }
  