SpringBoot2 线程池的定义和使用
SpringBoot2 线程池的定义和使用
定义线程池
@Slf4j
@EnableAsync
@Configuration
public class AsyncExecutorConfig implements AsyncConfigurer {
@Bean
public ThreadPoolTaskExecutor asyncServiceExecutor() {
//返回可用处理器的虚拟机的最大数量不小于1
int cpu = Runtime.getRuntime().availableProcessors();
log.info("start asyncServiceExecutor cpu : {}", cpu);
ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
//配置核心线程数
executor.setCorePoolSize(cpu);
//配置最大线程数
executor.setMaxPoolSize(cpu);
//配置队列大小
executor.setQueueCapacity(50);
//用来设置线程池关闭的时候等待所有任务都完成再继续销毁其他的Bean
executor.setWaitForTasksToCompleteOnShutdown(true);
//设置线程池中任务的等待时间,如果超过这个时候还没有销毁就强制销毁,以确保应用最后能够被关闭,而不是阻塞住
executor.setAwaitTerminationSeconds(60);
//配置线程池中的线程的名称前缀
executor.setThreadNamePrefix("async-service-");
// rejection-policy:当pool已经达到max size的时候,如何处理新任务
// CALLER_RUNS:不在新线程中执行任务,而是有调用者所在的线程来执行
// 使用预定义的异常处理类
executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
//执行初始化
executor.initialize();
return executor;
}
@Override
public Executor getAsyncExecutor() {
return asyncServiceExecutor();
}
@Override
public AsyncUncaughtExceptionHandler getAsyncUncaughtExceptionHandler() {
return (throwable, method, objects) -> {
StringBuilder sb = new StringBuilder();
for (Object param : objects) {
sb.append(param).append(",");
}
log.error("Exception message - {},Method name - {},Parameter value - {}", throwable.getMessage(), method.getName(), sb.toString());
};
}
}
如何使用
@Autowired
private ThreadPoolTaskExecutor threadPoolTaskExecutor;
public void test(){
CompletableFuture<Void> userFuture = CompletableFuture.runAsync(() -> System.out.println(111), threadPoolTaskExecutor);
}