Programming model in the Vavr framework
Programming model in the Vavr framework
Vavr is a Java -based functional programming language, which provides many practical tools and data structures for functional programming.In addition to functional programming, VAVR also provides a powerful and flexible concurrent programming model.In this article, we will introduce the concurrent programming model in the VAVR framework and provide some Java code examples.
In the traditional Java concurrent programming, we can use the Thread and Runnable interfaces to create and manage threads.However, there are some problems in this way, such as the concurrency access problem caused by locking and the sharing state between threads.Vavr solves these problems by providing a group of concurrent prices, making concurrent programming easier to write and understand.
Vavr's concurrent programming model is mainly composed of the following concepts:
1. Thread: VAVR provides a functional programming lightweight thread abstract interface -`io.vavr.concurrent.future`, which allows us to perform the task asynchronously and obtain the results.Below is an example of creating and using Future:
import io.vavr.concurrent.Future;
public class Example {
public static void main(String[] args) {
Future<String> future = Future.of(() -> {
Thread.sleep(2000);
return "Hello, Vavr!";
});
future.onsuccess (System.out :: Println); // Print results
}
}
In the above example, we created a Future that performs a time -consuming task through Lambda expression and then returns the result.We can use the `Onsuccess` method to handle the results after the task is successful.
2. Asynchronous execution: Vavr provides some methods to perform the asynchronous execution of the task.For example, we can use the `Future.runasync` method to perform an asynchronous task that does not return the value, and use the` Future.OFCALLELABLE` to perform an abnormal task that may throw an abnormality asynchronous.The following is an example of an asynchronous execution task:
import io.vavr.concurrent.Future;
public class Example {
public static void main(String[] args) {
Future.runAsync(() -> {
Thread.sleep(2000);
System.out.println ("Task completion!");
});
System.out.println ("Continue to perform other tasks ...");
}
}
In the above example, we use the `Runasync` method to perform a task asynchronously. The task is dormant for 2 seconds and then prints the message.During the execution of the task, we can continue to perform other tasks without waiting for the task to complete.
3. Response programming: VAVR supports responsive programming by providing `Promise`.Promise is a writing Future that we can use it to produce asynchronous results.We can use the `Promise.success` and` Promise.failure` methods to add the results or errors to the promise, and use the `promise.future () method to obtain the corresponding Future.Below is an example of using Promise:
import io.vavr.concurrent.Future;
import io.vavr.concurrent.Promise;
public class Example {
public static void main(String[] args) {
Promise<String> promise = Promise.make();
Future<String> future = promise.future();
future.onSuccess(System.out::println);
new Thread(() -> {
try {
// Simulate long -term tasks
Thread.sleep(2000);
promise.success("Hello, Vavr!");
} catch (InterruptedException e) {
promise.failure(e);
}
}).start();
}
}
In the above example, we created a promise and obtained FUTURE related to it through the `Future` method.We can use the `Success` method to add the result to the promise, and use the` Onsuccess` method to process the result when the Future is successfully executed.
Summary: The VAVR framework provides some convenient tools and data structures in concurrent programming, enabling us to write a complicated code easier.By using Vavr's thread abstraction, asynchronous execution and response programming model, we can better deal with concurrent tasks and avoid common concurrent problems.
I hope this article will help you understand the concurrent programming model in the VAVR framework.If you want to know more about Vavr, please check the official document or visit the official website of VAVR.
