The technical principles of scala complication in the Java library

The SCALA complication framework is a technical principle in the Java class library. It realizes concurrent programming by using a concurrent abstraction called "Actor model".In this article, we will introduce some technical principles of the SCALA concurrent framework and provide relevant Java code examples. 1. Actor model: The ACTOR model is a concurrent calculation model, which regards concurrent computing as a set of independent, executable ACTOR entities.Each Actor has its own status and behavior, and they communicate through messages.The ACTOR class in the SCALA concurrent framework provides the implementation of the ACTOR model. Here are a simple Java code example to demonstrate how to use the ACTOR model in the Akka library: import akka.actor.*; // Define an actor class class MyActor extends AbstractActor { // Define status and behavior @Override public Receive createReceive() { return receiveBuilder() .matchAny(message -> { // Process the receiving message System.out.println("Received message: " + message); }) .build(); } } public class Main { public static void main(String[] args) { // Create an Actor system ActorSystem system = ActorSystem.create("MySystem"); // Create an Actor instance ActorRef myActor = system.actorOf(Props.create(MyActor.class)); // Send a message to ACTOR myActor.tell("Hello World!", ActorRef.noSender()); // Turn off the Actor system system.terminate(); } } In the above code, we first define a MyActor class that inherits the ABSTRCTACTOR class.Then, we define the behavior of Actor in the CreateReceive () method, that is, how to handle the received messages.In the main function, we first created an Actorsystem instance, and then used the props.create () method to create a MyActor instance.Finally, we sent a message to MyACTOR using the Tell () method. 2. The original saying: The SCALA concurrent framework also provides some basic concurrent primitives, such as locks, condition variables, atomic variables, etc., to achieve thread synchronization and mutual exclusion.In the Java class library, we can use the classes in the java.util.concurrent package to achieve these concurrent originals. The following is an example of using Java to post primitives: import java.util.concurrent.locks.*; class Counter { private Lock lock = new ReentrantLock(); private int count = 0; public void increment() { lock.lock(); try { count++; } finally { lock.unlock(); } } public int getCount() { return count; } } public class Main { public static void main(String[] args) throws InterruptedException { Counter counter = new Counter(); // Create two threads concurrent execution Thread thread1 = new Thread(() -> { for (int i = 0; i < 10000; i++) { counter.increment(); } }); Thread thread2 = new Thread(() -> { for (int i = 0; i < 10000; i++) { counter.increment(); } }); // Starting thread thread1.start(); thread2.start(); // Waiting for the thread to execute thread1.join(); thread2.join(); // Print the value of the counter System.out.println("Counter value: " + counter.getCount()); } } In the above code, we define a Counter class that uses ReentrantLock to achieve mutually exclusive access.The increment () method uses the lock () method to get the lock, then the value of the meter is added, and the unlock () method is called to release the lock in the finally block.In the main function, we created two threads and let them execute the INCREMENT () method, and finally print the value of the counter. In summary, the technical principles of the SCALA concurrent framework in the Java class library are based on the ACTOR model and basic concurrency, which is realized by implementing concurrent abstraction and providing complications.By using these technical principles reasonably, we can write concurrent programs.