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.cassandra.utils.concurrent;
  
  import java.util.concurrent.CancellationException;
  import java.util.concurrent.ExecutionException;
  import java.util.concurrent.TimeUnit;
  import java.util.concurrent.TimeoutException;
  import java.util.function.Predicate;
  
  import org.junit.Assert;
  import org.junit.Test;
  
  import org.apache.cassandra.distributed.shared.ThrowingRunnable;
  
  public class ImmediateFutureTest
  {
  
      private void testSimple(ImmediateFuture<Boolean> p, boolean isCancelled) throws InterruptedException
      {
          Assert.assertEquals(p, p.await());
          Assert.assertEquals(p, p.awaitUninterruptibly());
          Assert.assertEquals(p, p.awaitThrowUncheckedOnInterrupt());
          Assert.assertTrue(p.await(1L, TimeUnit.MILLISECONDS));
          Assert.assertTrue(p.await(1L));
          Assert.assertTrue(p.awaitUntil(Long.MAX_VALUE));
          Assert.assertTrue(p.awaitUntilUninterruptibly(Long.MAX_VALUE));
          Assert.assertTrue(p.awaitUntilThrowUncheckedOnInterrupt(Long.MAX_VALUE));
          Assert.assertTrue(p.isDone());
          Assert.assertFalse(p.isCancellable());
          Assert.assertEquals(isCancelled, p.isCancelled());
          Assert.assertEquals(!isCancelled, p.setUncancellable());
          Assert.assertFalse(p.setUncancellableExclusive());
          Assert.assertFalse(p.cancel(true));
          Assert.assertFalse(p.cancel(false));
          Assert.assertFalse(p.trySuccess(false));
          Assert.assertFalse(p.tryFailure(new InterruptedException()));
      }
  
      @Test
      public void testSucceeded() throws InterruptedException, ExecutionException, TimeoutException
      {
          ImmediateFuture<Boolean> p = ImmediateFuture.success(true);
          Assert.assertTrue(p.getNow());
          Assert.assertTrue(p.get());
          Assert.assertTrue(p.get(1L, TimeUnit.MILLISECONDS));
          Assert.assertEquals(p, p.sync());
          Assert.assertEquals(p, p.syncUninterruptibly());
          Assert.assertFalse(p.isCancelled());
          testSimple(p, false);
      }
  
      @Test
      public void testFailed() throws InterruptedException
      {
          testFailed(ImmediateFuture.failure(new RuntimeException()), false, t -> t instanceof ExecutionException, t -> t instanceof RuntimeException);
      }
  
      @Test
      public void testCancelled() throws InterruptedException
      {
          testFailed(ImmediateFuture.cancelled(), true, t -> t instanceof CancellationException, t -> t instanceof CancellationException);
      }
  
      private void testFailed(ImmediateFuture<Boolean> p, boolean isCancelled, Predicate<Throwable> get, Predicate<Throwable> sync) throws InterruptedException
      {
          Assert.assertNull(p.getNow());
          assertFailure(p::get, get);
          assertFailure(() -> p.get(1L, TimeUnit.MILLISECONDS), get);
          assertFailure(p::sync, sync);
          assertFailure(p::syncUninterruptibly, sync);
          testSimple(p, isCancelled);
      }
  
      private static void assertFailure(ThrowingRunnable run, Predicate<Throwable> test)
      {
          Throwable failure = null;
          try
          {
              run.run();
          }
          catch (Throwable t)
          {
              failure = t;
          }
          if (failure == null || !test.test(failure))
              Assert.fail();
      }
  
  }
  