Examples of java.util.concurrent.ForkJoinPool.invoke()

java.util.concurrent.ForkJoinPool.invoke()
Performs the given task, returning its result upon completion. If the computation encounters an unchecked Exception or Error, it is rethrown as the outcome of this invocation. Rethrown exceptions behave in the same way as regular exceptions, but, when possible, contain stack traces (as displayed for example using {@code ex.printStackTrace()}) of both the current thread as well as the thread actually encountering the exception; minimally only the latter. @param task the task @param < T> the type of the task's result @return the task's result @throws NullPointerException if the task is null @throws RejectedExecutionException if the task cannot bescheduled for execution

   */
  public static void main(String[] args) throws InterruptedException, ExecutionException {
    
    ForkJoinPool pool = new ForkJoinPool();
    Task executionTask = new Task(1000000000.0);
    pool.invoke(executionTask);
    System.out.println(pool.toString());
    System.out.println(String.format("Full execution time is %d", executionTask.get()));
    pool.shutdown();
  }

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    Task task=new Task("Task",array,0,array.length);
    
    /*
     * Send the task to the pool
     */
    pool.invoke(task);
    
    /*
     * Shutdown the pool
     */
    pool.shutdown();

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public class FjLatchInvokeAll {


  public static void main(String[] args) throws InterruptedException {
    final CountDownLatch latch = new CountDownLatch(1);
    final ForkJoinPool pool = new ForkJoinPool();
    pool.invoke(ForkJoinTask.adapt(new Runnable() { // T
      @Override
      public void run() {
        ForkJoinTask.invokeAll(Arrays.asList(ForkJoinTask.adapt(new Runnable() {
          @Override
          public void run() {

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  private static void invokeTasks(){
    ForkJoinPool pool = new ForkJoinPool();
    
    for(File child : foldersToScan){
      pool.invoke(new Crawler(child));
        
    }
  }


  private static List<File> getFoldersIn(File root){

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    }


    public static Map<Long, Integer> match(String regex, String input, GraphDatabaseService db, GraphManager graphManager) {
        Map<Long, Integer> matches = new HashMap<>();
        ForkJoinPool pool = new ForkJoinPool();
        pool.invoke(new PatternMatcher(regex, input, matches, db, graphManager));


        // Cleaning up after yourself is important
        pool.shutdown();
        try {
            pool.awaitTermination(5, TimeUnit.SECONDS);

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        addExpectation(expectations, client, 200, 3800, createPackageFeed("feed-20", 200, 3801));
        context.checking(expectations);
        GetRemotePackageFeedAction instance = new GetRemotePackageFeedAction(200, arrayList, 0, 4000, clientFactory);
        //WHEN
        ForkJoinPool pool = new ForkJoinPool();
        pool.invoke(instance);
        //THEN
        context.assertIsSatisfied();
        assertThat(arrayList.size(), is(equalTo(4000)));
    }

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  /**Bounds calculation.  Is run in parallel using the tuning parameters of ParallelRenderer.**/
  public Rectangle2D bounds() {
    if (bounds == null) {
      ForkJoinPool pool = new ForkJoinPool(Runtime.getRuntime().availableProcessors());
      bounds = pool.invoke(
          new BoundsTask<>(
              this, 
              ParallelRenderer.RENDER_POOL_SIZE
                * ParallelRenderer.RENDER_THREAD_LOAD));
    }

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  public Rectangle2D bounds(int m) {
    int procs = Runtime.getRuntime().availableProcessors();
    ForkJoinPool pool = new ForkJoinPool(procs);
    bounds = pool.invoke(new BoundsTask<>(this, m*procs));
    return bounds;
  }
    
  @Override
  public Glyphset<G, I> segmentAt(int count, int segId) throws IllegalArgumentException {

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    Collections.shuffle(lu);
    Update[] updates = lu.toArray(new Update[0]); // Avoid allocation by passing
                                                  // zero-sized array
    MicroBlogUpdateSorter sorter = new MicroBlogUpdateSorter(updates);
    ForkJoinPool pool = new ForkJoinPool(4);
    pool.invoke(sorter);


    for (Update u : sorter.getResult()) {
      System.out.println(u);
    }
  }

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        int nThreads = Runtime.getRuntime().availableProcessors();
        System.out.println(nThreads);
        SelectMaxInArray t = new SelectMaxInArray(test);
        ForkJoinPool pool = new ForkJoinPool(nThreads);
        Long start = System.nanoTime();
        pool.invoke(t);
        Long end = System.nanoTime();
        long result = t.result;
        System.out.println("Done. Result: " + result + "time1 : " + (end - start));
        Long start2 = System.nanoTime();
        long result2 = test2.solveSequentially();

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