Snippet

Asynchronous Execution with @Async

The @Async annotation allows a method to run in a separate thread pool. The caller does not wait for the method to complete, making it ideal for background tasks like sending emails or notifications.

snippet.java

java

@Service
public class MailService {
    @Async
    public void sendWelcomeEmail(String email) {
        // Simulate network latency for sending mail
        smtpClient.send(email, "Welcome to our app!");
    }
}

spring

Breakdown

@Async

Instructs Spring to wrap the method call in a proxy that executes it on a background thread.

public void sendWelcomeEmail(String email)

This method must return void or a Future/CompletableFuture to work correctly with async proxying.

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Asynchronous Execution with @Async

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