/** @throws Exception If failed. */
  @SuppressWarnings("unchecked")
  public void testCancel() throws Exception {
    Grid grid = G.grid(getTestGridName());

    grid.compute()
        .localDeployTask(GridCancelTestTask.class, U.detectClassLoader(GridCancelTestTask.class));

    GridComputeTaskFuture<?> fut = grid.compute().execute(GridCancelTestTask.class.getName(), null);

    // Wait until jobs begin execution.
    boolean await = startSignal.await(WAIT_TIME, TimeUnit.MILLISECONDS);

    assert await : "Jobs did not start.";

    info("Test task result: " + fut);

    assert fut != null;

    // Only first job should successfully complete.
    Object res = fut.get();
    assert (Integer) res == 1;

    // Wait for all jobs to finish.
    await = stopSignal.await(WAIT_TIME, TimeUnit.MILLISECONDS);
    assert await : "Jobs did not stop.";

    // One is definitely processed. But there might be some more processed or cancelled or processed
    // and cancelled.
    // Thus total number should be at least SPLIT_COUNT and at most (SPLIT_COUNT - 1) *2 +1
    assert (cancelCnt + processedCnt) >= SPLIT_COUNT
            && (cancelCnt + processedCnt) <= (SPLIT_COUNT - 1) * 2 + 1
        : "Invalid cancel count value: " + cancelCnt;
  }
  /**
   * Prints a phrase on the grid nodes running anonymous closure objects and calculating total
   * number of letters.
   *
   * @param phrase Phrase to print on of the grid nodes.
   * @throws GridException If failed.
   */
  private static void countLettersClosure(String phrase) throws GridException {
    X.println(">>> Starting countLettersClosure() example...");

    // Explicitly execute the collection of callable objects and receive a result.
    Collection<Integer> results =
        G.grid()
            .call(
                SPREAD,
                new GridClosure<String, Integer>() { // Create executable logic.
                  @Override
                  public Integer apply(String word) {
                    // Print out a given word, just so we can
                    // see which node is doing what.
                    X.println(">>> Executing word: " + word);

                    // Return the length of a given word, i.e. number of letters.
                    return word.length();
                  }
                },
                Arrays.asList(phrase.split(" "))); // Collection of arguments for closures.

    // Add up all results using convenience 'sum()' method.
    int letterCnt = F.sum(results);

    X.println(">>>");
    X.println(">>> Finished execution of counting letters with closure based on GridGain 3.0 API.");
    X.println(">>> You should see the phrase '" + phrase + "' printed out on the nodes.");
    X.println(">>> Total number of letters in the phrase is '" + letterCnt + "'.");
    X.println(">>> Check all nodes for output (this node is also part of the grid).");
    X.println(">>>");
  }
  /**
   * Prints a phrase on the grid nodes running anonymous callable objects and calculating total
   * number of letters.
   *
   * @param phrase Phrase to print on of the grid nodes.
   * @throws GridException If failed.
   */
  private static void countLettersCallable(String phrase) throws GridException {
    X.println(">>> Starting countLettersCallable() example...");

    Collection<Callable<Integer>> calls = new HashSet<Callable<Integer>>();

    for (final String word : phrase.split(" "))
      calls.add(
          new GridCallable<Integer>() { // Create executable logic.
            @Override
            public Integer call() throws Exception {
              // Print out a given word, just so we can
              // see which node is doing what.
              X.println(">>> Executing word: " + word);

              // Return the length of a given word, i.e. number of letters.
              return word.length();
            }
          });

    // Explicitly execute the collection of callable objects and receive a result.
    Collection<Integer> results = G.grid().call(SPREAD, calls);

    // Add up all results using convenience 'sum()' method on GridFunc class.
    int letterCnt = F.sum(results);

    X.println(">>>");
    X.println(
        ">>> Finished execution of counting letters with callables based on GridGain 3.0 API.");
    X.println(">>> You should see the phrase '" + phrase + "' printed out on the nodes.");
    X.println(">>> Total number of letters in the phrase is '" + letterCnt + "'.");
    X.println(">>> Check all nodes for output (this node is also part of the grid).");
    X.println(">>>");
  }
  /**
   * Prints a phrase on one of the grid nodes running anonymous runnable.
   *
   * @param phrase Phrase to print on one of the grid nodes.
   * @throws GridException If failed.
   */
  private static void unicastWordsRunnable(final String phrase) throws GridException {
    X.println(">>> Starting unicastWordsRunnable() example...");

    G.grid()
        .run(
            UNICAST,
            new GridRunnable() {
              @Override
              public void run() {
                X.println(">>> Printing phrase: " + phrase);
              }
            });

    // NOTE:
    //
    // Alternatively, you can use existing closure 'F.println()' to
    // print any text like so:
    //
    // G.grid().run(UNICAST, F.println(">>> Printing phrase: " + phrase));
    //

    X.println(">>>");
    X.println(">>> Finished execution of runnable object based on GridGain 3.0 API.");
    X.println(">>> You should see the phrase '" + phrase + "' printed out on one of the nodes.");
    X.println(">>> Check all nodes for output (this node is also part of the grid).");
    X.println(">>>");
  }
  /**
   * Prints every word a phrase on different nodes.
   *
   * @param phrase Phrase from which to print words on different nodes.
   * @throws GridException If failed.
   */
  private static void spreadWordsClosure(String phrase) throws GridException {
    X.println(">>> Starting spreadWordsClosure() example...");

    // Splits the passed in phrase into words and prints every word
    // on a individual grid node. If there are more words than nodes -
    // some nodes will print more than one word.
    G.grid()
        .run(
            SPREAD,
            F.yield(
                phrase.split(" "),
                new GridInClosure<String>() {
                  @Override
                  public void apply(String word) {
                    X.println(word);
                  }
                }));

    // NOTE:
    //
    // Alternatively, you can use existing closure 'F.println()' to
    // print any yield result in 'F.yield()' like so:
    //
    // G.grid().run(SPREAD, F.yield(phrase.split(" "), F.println()));
    //

    X.println(">>>");
    X.println(
        ">>> Finished printing individual words on different nodes based on GridGain 3.0 API.");
    X.println(">>> Check all nodes for output (this node is also part of the grid).");
    X.println(">>>");
  }
  /**
   * Broadcasts a give phrase to all nodes.
   *
   * @param phrase Phrase to broadcast.
   * @throws GridException If failed.
   */
  private static void broadcastWordsClosure(final String phrase) throws GridException {
    X.println(">>> Starting broadcastWordsClosure() example...");

    G.grid()
        .run(
            BROADCAST,
            new GridAbsClosure() {
              @Override
              public void apply() {
                X.println(">>> Printing phrase: " + phrase);
              }
            });

    // NOTE:
    //
    // Alternatively, you can use existing closure 'F.println()' to
    // print any text like so:
    //
    // G.grid().run(BROADCAST, F.println(">>> Printing phrase: " + phrase));
    //

    X.println(">>>");
    X.println(">>> Finished broadcasting a phrase to all grid nodes based on GridGain 3.0 API.");
    X.println(">>> Check all nodes for output (this node is also part of the grid).");
    X.println(">>>");
  }
    /**
     * Check if flags in correct state.
     *
     * @param msg Message.
     */
    private void checkSyncFlags(GridIoMessage msg) {
      if (!commSpiEnabled) return;

      Object o = msg.message();

      if (!(o instanceof GridDistributedLockRequest)) return;

      GridKernal g = (GridKernal) G.grid(nodeId);

      GridCacheTxManager<Object, Object> tm =
          g.internalCache(REPLICATED_ASYNC_CACHE_NAME).context().tm();

      GridCacheVersion v = ((GridCacheVersionable) o).version();

      GridCacheTxEx t = tm.tx(v);

      if (t.hasWriteKey("x1")) {
        assertFalse(t.syncCommit());
      } else if (t.hasWriteKey("x2")) {
        assertTrue(t.syncCommit());
      } else if (t.hasWriteKey("x3")) {
        assertFalse(t.syncCommit());
      } else if (t.hasWriteKey("x4")) {
        assertTrue(t.syncCommit());
      }
    }
  /**
   * Calculates length of a given phrase on the grid.
   *
   * @param phrase Phrase to count the number of letters in.
   * @throws GridException If failed.
   */
  private static void countLettersReducer(String phrase) throws GridException {
    X.println(">>> Starting countLettersReducer() example...");

    Grid grid = G.grid();

    // Logger to use in your closure. Note that even though we assign it
    // to a local variable, GridGain still allows to use it from remotely
    // executed code.
    final GridLogger log = grid.log();

    // Execute Hello World task.
    int letterCnt =
        grid.reduce(
            BALANCE,
            new GridClosure<String, Integer>() { // Create executable logic.
              @Override
              public Integer apply(String word) {
                // Print out a given word, just so we can
                // see which node is doing what.
                log.info(">>> Calculating for word: " + word);

                // Return the length of a given word, i.e. number of letters.
                return word.length();
              }
            },
            Arrays.asList(phrase.split(" ")), // Collection of words.
            // Create custom reducer.
            // NOTE: Alternatively, you can use existing reducer: F.sumIntReducer()
            new GridReducer<Integer, Integer>() {
              private int sum;

              @Override
              public boolean collect(Integer res) {
                sum += res;

                return true; // True means continue collecting until last result.
              }

              @Override
              public Integer apply() {
                return sum;
              }
            });

    X.println(">>>");
    X.println(">>> Finished execution of counting letters with reducer based on GridGain 3.0 API.");
    X.println(">>> Total number of letters in the phrase is '" + letterCnt + "'.");
    X.println(">>> You should see individual words printed out on different nodes.");
    X.println(">>> Check all nodes for output (this node is also part of the grid).");
    X.println(">>>");
  }