Java 25 Feature: Structured Task Scope

 Structured Task Scope

So in the above code what is happening, code line var scope = new StructuredTaskScope<>() is opening a scop (consider it as a container) and any task (thread) which is being opened or executed in this scop will be consistent to other tasks in that same scope.

scope.join() is making the both the tasks to execute and finish together. 
scope.throwIfFailed() which means if any task is failed then other executed tasks will also come on halt.

e.g take this scenario where you want to update user password in diff servers. if password update failed on any server then we can discard the whole process so that user doesn't have to use old and new password on diff servers that would be very sus infra.

import java.util.concurrent.StructuredTaskScope; public class StructuredExample { static String fetchUser() { try { Thread.sleep(100); } catch (InterruptedException e) { Thread.currentThread().interrupt(); } return "Pran"; } static String fetchOrder() { try { Thread.sleep(150); } catch (InterruptedException e) { Thread.currentThread().interrupt(); } return "Order#99"; } public static void main(String[] args) throws Exception { try (var scope = new StructuredTaskScope()) { var userTask = scope.fork(() -> fetchUser()); var orderTask = scope.fork(() -> fetchOrder()); /*this line waits for both threads to get finished*/ scope.join(); /* propegate error if any error occurs */ scope.throwIfFailed(); System.out.println(userTask.get() + " <--> " + orderTask.get()); } } }