/**
   * 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(">>>");
  }