Async (Spring Boot)

Introduction

Asynchronous execution in Spring Boot and the @Async annotation.

package edu.cou.myapp;

import java.lang.reflect.Method;

import org.springframework.aop.interceptor.AsyncUncaughtExceptionHandler;

import org.springframework.context.annotation.Configuration;

import org.springframework.scheduling.annotation.AsyncConfigurer;

import org.springframework.scheduling.annotation.EnableAsync;

import lombok.extern.slf4j.Slf4j;

/**

* Asynchronous processing.

@Slf4j

@EnableAsync

@Configuration

public class AsyncConfig implements AsyncConfigurer, AsyncUncaughtExceptionHandler {

@Override

public AsyncUncaughtExceptionHandler getAsyncUncaughtExceptionHandler() {

// DOC Instance of the functional interface AsyncUncaughtExceptionHandler

return this;

}

@Override

public void handleUncaughtException(Throwable ex, Method method, Object... params) {

log.warn("----------------INI CustomAsyncExceptionHandler----------------");

log.warn("Method name: " + method.getName());

for (Object px : params) {

log.warn("Parameter value: " + px);

}

log.warn("Exception message: " + ex.getMessage(), ex);

log.warn("----------------END CustomAsyncExceptionHandler----------------");

}

>>> Return type of an @Async method

The return type must be void or java.util.concurrent.Future

>>> Timeout for async method

String result = futureResult.get(1, TimeUnit.SECOND);