Package com.packtpub.java7.concurrency.chapter1.recipe1.task

Examples of com.packtpub.java7.concurrency.chapter1.recipe1.task.Calculator


   
    /*
     * Create the five threads to execute five tasks
     */
    for (int i=0; i<taskThreads.length; i++){
      Task task=new Task(i,queue);
      taskThreads[i]=new Thread(task);
    }
   
    /*
     * Start the five threads
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    /*
     * Write the results to the console
     */
    do {
      int counter=0;
      Event event;
      do {
        event=queue.poll();
        if (event!=null) counter++;
      } while (event!=null);
      System.out.printf("At %s you have read %d events\n",new Date(),counter);
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    /*
     * Execute the 25 tasks
     */
    for (char i='A'; i<'Z'; i++) {
      Task task=new Task(map, String.valueOf(i));
      threads[counter]=new Thread(task);
      threads[counter].start();
      counter++;
    }
   
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    /*
     * Write the first element of the map
     */
    Map.Entry<String, Contact> element;
    Contact contact;
   
    element=map.firstEntry();
    contact=element.getValue();
    System.out.printf("Main: First Entry: %s: %s\n",contact.getName(),contact.getPhone());
   
    /*
     * Write the last element of the map
     */
    element=map.lastEntry();
    contact=element.getValue();
    System.out.printf("Main: Last Entry: %s: %s\n",contact.getName(),contact.getPhone());

    /*
     * Write a subset of the map
     */
    System.out.printf("Main: Submap from A1996 to B1002: \n");
    ConcurrentNavigableMap<String, Contact> submap=map.subMap("A1996", "B1002");
    do {
      element=submap.pollFirstEntry();
      if (element!=null) {
        contact=element.getValue();
        System.out.printf("%s: %s\n",contact.getName(),contact.getPhone());
      }
    } while (element!=null);
  }
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  public static void main(String[] args) {

    /*
     * Creation of the custom executor
     */
    MyExecutor myExecutor=new MyExecutor(2, 4, 1000, TimeUnit.MILLISECONDS, new LinkedBlockingDeque<Runnable>());
   
    /*
     * Create a list to store the objects to control the execution of the tasks
     */
    List<Future<String>> results=new ArrayList<>();
   
    /*
     * Create and submit to the executor 10 tasks
     */
    for (int i=0; i<10; i++) {
      SleepTwoSecondsTask task=new SleepTwoSecondsTask();
      Future<String> result=myExecutor.submit(task);
      results.add(result);
    }
   
    /*
     * Get the result of the execution of the first five tasks
     */
    for (int i=0; i<5; i++){
      try {
        String result=results.get(i).get();
        System.out.printf("Main: Result for Task %d : %s\n",i,result);
      } catch (InterruptedException | ExecutionException e) {
        e.printStackTrace();
      }
    }
   
    /*
     * Call the shutdown method
     */
    myExecutor.shutdown();
   
    /*
     * Get the results of the execution of the last five tasks
     */
    for (int i=5; i<10; i++){
      try {
        String result=results.get(i).get();
        System.out.printf("Main: Result for Task %d : %s\n",i,result);
      } catch (InterruptedException | ExecutionException e) {
        e.printStackTrace();
      }
    }
   
    /*
     * Wait for the finalization of the Executor
     */
    try {
      myExecutor.awaitTermination(1, TimeUnit.DAYS);
    } catch (InterruptedException e) {
      e.printStackTrace();
    }
   
    /*
 
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    /*
     * Create and submit to the executor 10 tasks
     */
    for (int i=0; i<10; i++) {
      SleepTwoSecondsTask task=new SleepTwoSecondsTask();
      Future<String> result=myExecutor.submit(task);
      results.add(result);
    }
   
    /*
 
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    /*
     * Send four task to the executor
     */
    for (int i=0; i<4; i++){
      MyPriorityTask task=new MyPriorityTask("Task "+i,i);
      executor.execute(task);
    }
   
    /*
     * sleep the thread during one second
     */
    try {
      TimeUnit.SECONDS.sleep(1);
    } catch (InterruptedException e) {
      e.printStackTrace();
    }
   
    /*
     * Send four tasks to the executor
     */
    for (int i=4; i<8; i++) {
      MyPriorityTask task=new MyPriorityTask("Task "+i,i);
      executor.execute(task);     
    }
   
    /*
     * Shutdown the executor
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    ExecutorService executor=Executors.newCachedThreadPool(threadFactory);
   
    /*
     * Create a new Task object
     */
    MyTask task=new MyTask();
   
    /*
     * Submit the task
     */
    executor.submit(task);
 
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  public static void main(String[] args) throws Exception {
   
    /*
     * Create a new MyThreadFactory object
     */
    MyThreadFactory threadFactory=new MyThreadFactory("MyThreadFactory");
   
    /*
     * Create a new ThreadPoolExecutor and configure it for use the
     * MyThreadFactoryObject created before as the factory to create the threads
     */
 
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  public static void main(String[] args) {

    /*
     * Create a new MyLock object
     */
    MyLock lock=new MyLock();
   
    /*
     * Create and run ten task objects
     */
    for (int i=0; i<10; i++){
      Task task=new Task("Task-"+i,lock);
      Thread thread=new Thread(task);
      thread.start();
    }
   
    /*
     * The main thread also tries to get the lock
     */
    boolean value;
    do {
      try {
        value=lock.tryLock(1,TimeUnit.SECONDS);
        if (!value) {
          System.out.printf("Main: Trying to get the Lock\n");
        }
      } catch (InterruptedException e) {
        e.printStackTrace();
        value=false;
      }
    } while (!value);
   
    /*
     * The main thread release the lock
     */
    System.out.printf("Main: Got the lock\n");
    lock.unlock();
   
    /*
     * Write a message in the console indicating the end of the program
     */
    System.out.printf("Main: End of the program\n");
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