Dev7

Module 7: Asynchronous Programming and Performance (Java)

This module focuses on concurrency, asynchronous programming, and backend performance optimization in Java.

7.1 Learning Objectives

• Understand Java’s concurrency model and thread management.
• Use asynchronous operations with CompletableFuture.
• Optimize backend performance using caching and load balancing.

7.2 CompletableFuture Example

import java.util.concurrent.*;

public class AsyncExample {
    public static void main(String[] args) {
        CompletableFuture.supplyAsync(() -> {
            return "Running async task...";
        }).thenAccept(System.out::println);
    }
}
  

7.3 Caching with Redis

@Service
public class DataService {
    @Cacheable("items")
    public String getData() {
        simulateDelay();
        return "Data retrieved";
    }

    private void simulateDelay() {
        try { Thread.sleep(2000); } catch (InterruptedException e) { e.printStackTrace(); }
    }
}
  

7.4 Exercise

• Implement asynchronous calls in a service layer.
• Enable caching for database queries using Spring Cache and Redis.