Snippet

Executing Background Tasks with CompletableFuture

Spring supports asynchronous method invocation to run long-running operations in separate threads. By marking a method with @Async and returning a CompletableFuture, callers can trigger tasks without blocking the main execution thread.

snippet.java

java

@Service
public class NotificationService {
 
    @Async
    public CompletableFuture<String> sendEmailNotification(String recipientEmail) {
        // Simulates a time-consuming email delivery process
        return CompletableFuture.completedFuture("Email sent to " + recipientEmail);
    }
}

spring

Breakdown

@Async

Indicates that the method should be executed asynchronously in a separate worker thread pool.

public CompletableFuture<String> sendEmailNotification(String recipientEmail)

Defines a method signature returning a generic CompletableFuture container holding the final result.

return CompletableFuture.completedFuture("Email sent to " + recipientEmail);

Wraps the outcome in an already completed asynchronous future.

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Executing Background Tasks with CompletableFuture

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