My program is not returning/ending with Executor

executorservice
java future
threadpoolexecutor
completablefuture
java executors
executor services
callable vs runnable
java future callback

Given the following Java example, which uses multithreading:

 import java.util.concurrent.*;

 public class SquareCalculator {
     private ExecutorService executor = Executors.newSingleThreadExecutor();

     public Future<Integer> calculate(Integer input) {
         return executor.submit( () -> {
             Thread.sleep(1000);
             return input * input;
         });
     }

     public static void main(String[] args) {
         try {
             Future<Integer> future = new SquareCalculator().calculate(10);
             while (!future.isDone()){
                 System.out.println("Calculating...");
                 Thread.sleep(300);
             }

             Integer result = future.get();
             System.out.println("we got: " + result);
         } catch(InterruptedException | ExecutionException e) {
             System.out.println("had exception");
         }
     }
 }

It produces:

java SquareCalculator
Calculating...
Calculating...
Calculating...
Calculating...
we got: 100

But the application is never terminating.

Am I suppose to join the thread or something?

You need to shut down the executor framework towards the end of the program and wait until it gracefully terminates..

executor.shutdown();
try {
    executor.awaitTermination(4 * 3600, TimeUnit.SECONDS);
} catch (Exception e) {
    e.printStackTrace();
}

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Should be in comment but not enough reputation.

You should call shutdown on executor. You can get more details from below link: Reason for calling shutdown() on ExecutorService

Healing from Depression: 12 Weeks to a Better Mood, There is nothing to look forward to, no dreams to fulfill, only the never-ending agony ideation”) in November 1996, shortly after I began the day treatment program. (It remains one of the unexplained miracles in my life that I returned home safely.) named my brother the executor, and sent copies to him and a good friend. The executor should check with the state and the Internal Revenue Service (IRS) to determine if the estate qualifies for an exemption. If not, the executor must pay the taxes and obtain a release from the tax agencies proving they were paid. These documents are needed to close the estate with the probate court. 3.

I bet you want to add something like this:

   finally {
        if (executor != null) {
            executor.shutdown();
        }
    }

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Pobladoras, Indígenas, and the State: Conflicts Over Women's , American countries with high levels of inequality, the figure does not change nearly as administrative initiative that got underway after my fieldwork had ended— the entities as executors of programs, consultants, or project/policy evaluators. By 2003, this situation had led several organizations to return to SOL, which  If you are not in the business of being an executor and you only did it once then line 21 is the correct place (of course for 2018 the forms have changed but the concept is the same) You can report it as other income on Form 1040 line 21. Here's how to enter it in TurboTax. · Click the Federal Taxes tab (Personal in the Home & Business version)

Concurrency in Java: The Executor Framework, Unlike the fixed thread pool, the number of threads of this executor pool is not bounded. the task with fixed interval, irrespective of when the previous task ended. to the executor, like above, is asynchronous i.e. the program execution does not If the task is complete the result is immediately returned to the caller or else  If the tenant had a month-to-month lease agreement, notice of the tenant's death acts as the end of the lease, and the executor's responsibility ends 30 days after the tenant last paid rent.

Java Callable and Future Tutorial, What if you want to return a result from your tasks? Well, Java Just like Runnable , you can submit a Callable to an executor service for execution. isDone()) { System.out.println("Task is still not done. In the above program, the first call to future.get() statement blocks until all the futures are complete. -- Set the return code to 0. SET @Return = 0 END. GO. After the script runs, the db_executor role will have permission to execute. every stored procedure in the database. That means any user I

Comments
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