java / expert
Snippet
Non-Blocking Asynchronous Processing with DeferredResult
DeferredResult is used to release the web container thread while processing long-running tasks in a separate thread. This significantly improves application scalability and throughput under high load.
snippet.java
java
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@GetMapping("/async-task")public DeferredResult<ResponseEntity<?>> executeAsyncTask() {DeferredResult<ResponseEntity<?>> output = new DeferredResult<>(5000L);ForkJoinPool.commonPool().submit(() -> {try {// Simulate heavy computationThread.sleep(2000);output.setResult(ResponseEntity.ok("Task Completed"));} catch (Exception e) {output.setErrorResult(ResponseEntity.status(500).body("Error"));}});return output;}
spring
Breakdown
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DeferredResult<ResponseEntity<?>> output = new DeferredResult<>(5000L);
Initializes a DeferredResult with a 5-second timeout.
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output.setResult(ResponseEntity.ok("Task Completed"));
Sets the final result of the operation, which completes the HTTP response.
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return output;
Immediately returns the container thread to the pool while the worker thread continues processing.