--- title: The Executor Framework – Part IV description: The Executor Framework – Part IV --- [![e-Zest logo\_An accion lab company\_Colour](https://blog.e-zest.com/hubfs/images/Logos%20with%20Tagline/Corporate/SVG/e-Zest%20logo_An%20accion%20lab%20company_Colour.svg "e-Zest logo_An accion lab company_Colour")](https://www.e-zest.com/) - [WORK](https://www.e-zest.com/our-work) - [SERVICES](https://www.e-zest.com/our-services) - [Product Engineering](https://www.e-zest.com/digital-product-engineering-services) - [Enterprise Data Services](https://www.e-zest.com/enterprise-data-services) - [Digital Commerce](https://www.e-zest.com/digital-commerce-services) - [Digital Operations](https://www.e-zest.com/digital-operations) - [Digital Consulting](https://www.e-zest.com/digital-transformation-consulting-services) - [Digital Experience Design](https://www.e-zest.com/digital-experience-design) - [INSIGHTS](https://blog.e-zest.com/) - [CAREERS](https://www.e-zest.com/careers) - [ENTERPRISE DATA SERVICES](https://www.e-zest.com/enterprise-data-services) - [GENERATIVE AI](https://www.e-zest.com/generative-ai) - [Healthcare](https://healthcare.e-zest.com) - [Contact Us](https://www.e-zest.com/contact-us) - ![Elevating Product Engineering with AI and ML](https://blog.e-zest.com/hubfs/Elevating%20Product%20Engineering%20with%20AI%20and%20ML.jpg) [BLOGS](https://blog.e-zest.com) #### Elevating Product Engineering with AI and ML As technology evolves and customer choices broaden, there is an increasing ... 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In this blog post, I am writing about use of `ExecutorService` to submit multiple `Callable` tasks for bulk execution and assigning a timeout to Callable tasks submitted for bulk execution. **Submitting Callable tasks for bulk execution** The `invokeAll(Collection> tasks)` method of `ExecutorService` enables submitting a collection of `Callable` tasks for execution. This method returns `List>` which contains `Future` objects to get the result of all `Callable` tasks after all the tasks in the collection are executed. The `Callable` tasks submitted to this method may either be executed normally or may have thrown an exception. The order of `Future` objects in the returned list is same as the `Callable` tasks in the collection. The `get()` method of `Future` can be called to get its return value. If the task threw an exception during execution, the `get()` method throws `ExecutionException`. The collection submitted to this method should not be modified after it is called. To ensure this, the `Collections.unmodifiableCollection(Collection c)` method can be called to get an unmodifiable collection which can be passed to the `invokeAll` method. The thread which calls the `invokeAll` method can be interrupted while waiting. If it is interrupted, it throws `InterruptedException` and cancels all unfinished tasks. A `Callable` task which computes the sum of numbers is given in Listing 1. ``` public class ComputeSum implements Callable { private List numbers; public void setNumbers(List numbers) { this.numbers = numbers; } public Integer call() throws Exception { int sum = 0; for(Integer number : numbers) { System.out.println("Adding number : " + number); sum += number; } return sum; } } ``` Listing 1. A Callable task which computes sum of numbers Listing 2 shows a code which submits a collection of `Callable` tasks to `ExecutorService` for bulk execution. ``` //Generate 30 random numbers in the range of 0 to 100 Random randomGenerator = new Random(); List numbers = new ArrayList(); for(int i=1; i <= 30; i++) { numbers.add(randomGenerator.nextInt(100)); } ExecutorService service = Executors.newSingleThreadExecutor(); //create three tasks and assign the numbers to them ComputeSum task1 = new ComputeSum(); ComputeSum task2 = new ComputeSum(); ComputeSum task3 = new ComputeSum(); //first task computes sum of 1 through 10 numbers in the list task1.setNumbers(numbers.subList(0, 10)); //second task computes sum of 11 through 20 numbers in the list task2.setNumbers(numbers.subList(10, 20)); //third task computes sum of remaining numbers task3.setNumbers(numbers.subList(20, 30)); boolean allTasksCompletedNormally = true; //create a collection of tasks Collection collection = new ArrayList(); collection.add(task1); collection.add(task2); collection.add(task3); //submit the tasks for execution using unmodifiable collection try { List> futures = service.invokeAll( Collections.unmodifiableCollection(collection)); int sum = 0; //Get the result of all tasks for(Future future : futures) { try { sum += future.get(); } catch (ExecutionException e) { allTasksCompletedNormally = false; } } //print sum only if all tasks are executed normally if(allTasksCompletedNormally) { System.out.println("Sum = " + sum); } else { System.out.println("Some task threw an exception. "); } } catch (InterruptedException e) { e.printStackTrace(); } ``` Listing 2. Code which submits multiple Callable tasks for bulk execution **Assigning a timeout for all Callable tasks** The `invokeAll(Collection> tasks, long timeout, TimeUnit unit)` method of `ExecutorService` can be called to assign a maximum time period to wait for all the tasks to complete execution. This method stops execution and returns a `List` when all `Callable` tasks in the collection are executed normally or with exception. It throws `CancellationException` when the timeout period elapses before completion of all tasks. The thread calling this method can be interrupted to stop execution of tasks. If the thread is interrupted, this method throws `InterruptedException`. 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By Madhura Oak Nov 13, 2013](https://blog.e-zest.com/multiple-inheritance-in-domain-model-design/) ## Helping Organizations Thrive in the Digital Age [Contact Us](https://www.e-zest.com/contact-us) - [About](https://www.e-zest.com/about-us) - [Services](https://www.e-zest.com/our-services) - [Work](https://www.e-zest.com/our-work) - [Insights](https://blog.e-zest.com/) - [Healthcare](https://healthcare.e-zest.com/) - [Accion Labs](https://www.accionlabs.com/) - - - - - - Dallas - Detroit - Hannover - Vienna - London - Pune © 2025 e-Zest Solutions - [Privacy Policy](https://www.e-zest.com/privacypolicy) - [Cookie Policy](https://www.e-zest.com/cookie-policy) Contact us Contact us e-Zest is a leading digital innovation partner for enterprises and technology companies that utilizes emerging technologies for creating engaging customers experiences. 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