java / beginner
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
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@Servicepublic class NotificationService {@Asyncpublic CompletableFuture<String> sendEmailNotification(String recipientEmail) {// Simulates a time-consuming email delivery processreturn CompletableFuture.completedFuture("Email sent to " + recipientEmail);}}
spring
Breakdown
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@Async
Indicates that the method should be executed asynchronously in a separate worker thread pool.
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public CompletableFuture<String> sendEmailNotification(String recipientEmail)
Defines a method signature returning a generic CompletableFuture container holding the final result.
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return CompletableFuture.completedFuture("Email sent to " + recipientEmail);
Wraps the outcome in an already completed asynchronous future.