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Java example source code file (AbstractChainedListenableFutureTest.java)

This example Java source code file (AbstractChainedListenableFutureTest.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

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Java - Java tags/keywords

abstractchainedlistenablefuturetest, error, exception, exception_data, listenablefuture, mockfuturelistener, override, settablefuture, testcase, the, threading, threads, throwable, timeoutexception, valid_input_data

The AbstractChainedListenableFutureTest.java Java example source code

/*
 * Copyright (C) 2008 The Guava Authors
 *
 * 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.google.common.util.concurrent;

import com.google.common.util.concurrent.testing.MockFutureListener;

import junit.framework.TestCase;

import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

/**
 * Unit tests for any listenable future that chains other listenable futures.
 * Unit tests need only override buildChainingFuture and getSuccessfulResult,
 * but they can add custom tests as needed.
 *
 * @author Nishant Thakkar
 */
public abstract class AbstractChainedListenableFutureTest<T> extends TestCase {
  protected static final int EXCEPTION_DATA = -1;
  protected static final int VALID_INPUT_DATA = 1;
  protected static final Exception EXCEPTION = new Exception("Test exception");

  protected SettableFuture<Integer> inputFuture;
  protected ListenableFuture<T> resultFuture;
  protected MockFutureListener listener;

  @Override
  protected void setUp() throws Exception {
    super.setUp();

    inputFuture = SettableFuture.create();
    resultFuture = buildChainingFuture(inputFuture);
    listener = new MockFutureListener(resultFuture);

  }

  public void testFutureGetBeforeCallback() throws Exception {
    // Verify that get throws a timeout exception before the callback is called.
    try {
      resultFuture.get(1L, TimeUnit.MILLISECONDS);
      fail("The data is not yet ready, so a TimeoutException is expected");
    } catch (TimeoutException expected) {}
  }

  public void testFutureGetThrowsWrappedException() throws Exception {
    inputFuture.setException(EXCEPTION);
    listener.assertException(EXCEPTION);
  }

  public void testFutureGetThrowsWrappedError() throws Exception {
    Error error = new Error();
    inputFuture.setException(error);
    // Verify that get throws an ExecutionException, caused by an Error, when
    // the callback is called.
    listener.assertException(error);
  }

  public void testAddListenerAfterCallback() throws Throwable {
    inputFuture.set(VALID_INPUT_DATA);

    listener.assertSuccess(getSuccessfulResult());
  }

  public void testFutureBeforeCallback() throws Throwable {
    inputFuture.set(VALID_INPUT_DATA);

    listener.assertSuccess(getSuccessfulResult());
  }

  /**
   * Override to return a chaining listenableFuture that returns the result of
   * getSuccessfulResult() when inputFuture returns VALID_INPUT_DATA, and sets
   * the exception to EXCEPTION in all other cases.
   */
  protected abstract ListenableFuture<T> buildChainingFuture(
      ListenableFuture<Integer> inputFuture);

  /**
   * Override to return the result when VALID_INPUT_DATA is passed in to
   * the chaining listenableFuture
   */
  protected abstract T getSuccessfulResult();
}

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