如何让Java rest api调用立即返回不等？

Question

@RequestMapping(value = "/endpoint", method = RequestMethod.POST)
    public ResponseEntity<?> endpoint(@RequestBody final ObjectNode data, final HttpServletRequest request) {
        somefunction();
        return new ResponseEntity<>(HttpStatus.OK);
    }


public somefunction() {
 .....
 }

在Java spring controller中,我有一个端点.调用此端点时,我希望它直接返回,而不是等待somefunction()完成.任何人都可以教我如何处理这个问题？

Answer 1

如果您使用的是Java 8,则可以使用新Executor类:

@RequestMapping(value = "/endpoint", method = RequestMethod.POST)
public ResponseEntity<?> endpoint(@RequestBody final ObjectNode data, final HttpServletRequest request) {
    Executors.newScheduledThreadPool(1).schedule(
        () -> somefunction(),
        10, TimeUnit.SECONDS
    );
    return new ResponseEntity<>(HttpStatus.ACCEPTED);
}

这将:

1. 计划somefunction()在延迟10秒后运行.
2. 返回HTTP 202已接受(当您的POST端点实际上没有在现场创建任何内容时,应该返回此值).
3. somefunction()10秒后运行.

Answer 2

换线

somefunction();

成为

new Thread()
{
    public void run() {
        somefunction();
    }
}.start();