How to create java program to illustrate Project loom using virtual thread??

 Project Loom in java

              Project loom offers you a lightweight concurrency model. This can be achieved by the concept of “Virtual threading”. Java includes this in JDK 21.

What is virtual thread?

              It is a lightweight process managed by virtual machine. It is similar process of threads in Operating system. But specialty is memory allocation and number of tasks handling is very higher than normal OS.

Features of virtual thread:

• ·       It is preemptive.
• ·       It handles millions of tasks.
• ·       Memory is allocated quickly.
• ·       It hops over the processors.
• ·       Memory mapping is shared among virtual threads.
• ·       Concurrency and parallelism is possible.

How to create java program to illustrate Project loom using virtual thread??

              It creates VThreadEg class.

Steps to follow:

• ·       Include the built-in packages java. util.concurrent.ExecutorService,java.util.concurrent.Executors, java.util.stream.IntStream;
• ·       Create the class VThreadEg and include the main () function.
• ·       Creating an object for ExecutorService and call virtualthreadpertaskexecutor.
• ·       Next, Submit lakhs of tasks to the executor.
• ·       Just make the thread to sleep for time for a blocking operation.
• ·       Finally,close the task.

Program:

import java.util.concurrent.ExecutorService;

import java.util.concurrent.Executors;

import java.util.stream.IntStream;

public class VThreadEg {

    public static void main(String[] args) {

        // Creating an object for  ExecutorService

        ExecutorService executor = Executors.newVirtualThreadPerTaskExecutor();

        // Submitting lakhs of tasks to the executor

        IntStream.range(0, 100_000).forEach(i -> executor.submit(() -> {

            try {

                // a blocking operation is modelled here

                Thread.sleep(115);

                System.out.println("Task " + i + " completed");

            } catch (InterruptedException e) {

                Thread.currentThread().interrupt();

            }

        }));

        // this code close the task.

        executor.shutdown();

    }

}

While executing this program, you will get the below output.

C:\raji\blog>javac VThreadEg.java

C:\raji\blog>java VThreadEg

Task 0 completed

Task 6 completed

Task 8 completed

Task 7 completed

Task 9 completed

Task 11 completed

Task 12 completed

Task 1 completed

Task 13 completed

Task 15 completed

Task 3 completed

Task 18 completed

Task 4 completed

Task 23 completed

Task 24 completed

Task 26 completed

Task 2 completed

Task 28 completed

Task 30 completed

Task 5 completed

Task 34 completed

Task 10 completed

Task 33 completed

Task 37 completed

Task 14 completed

Task 36 completed

Task 38 completed

Task 17 completed

Task 42 completed

Task 16 completed

Task 44 completed

Task 45 completed

Task 19 completed

Task 53 completed

Task 52 completed

Task 20 completed

Task 59 completed

Task 61 completed

Task 21 completed

Task 68 completed

Task 66 completed

Task 88 completed

This program executes the project loom using virtual threading. This gives you high throughput.