SpringBoot 接口并发限制(Semaphore)

原创

EicroSoft 2022-12-23 10:00:24 博主文章分类：JAVA ©著作权

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@RestController
@RequestMapping({"/Test"})
public class test { 

    Logger logger = LoggerFactory.getLogger(this.getClass());
 
    // 使用 Semaphore 并发限制3个 超过阻塞
    private final Semaphore permit = new Semaphore(3, true);


    @GetMapping(value = {"/download"})
    public String download(HttpServletRequest request) {        
        String result = "";
        try {
            // 获取令牌         
            logger.info("锁住 {}", Thread.currentThread().getName());
            permit.acquire();
            logger.info("下载 {}", Thread.currentThread().getName());
            Thread.sleep(5000);
            result = "Success";
        } catch (Exception e) {
            e.printStackTrace();
            return e.getMessage();
        } finally {
            // 释放令牌
            permit.release(); 
            logger.info("释放 {}", Thread.currentThread().getName());
        } 
    }

}

[2022-11-29 14:33:05.042] [http-nio-6201-exec-1] [INFO ] com.vipsoft.controller.ReleaseController - 锁住 http-nio-6201-exec-1
[2022-11-29 14:33:05.042] [http-nio-6201-exec-1] [INFO ] com.vipsoft.controller.ReleaseController - 工作 http-nio-6201-exec-1
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Disconnected from the target VM, address: '127.0.0.1:7367', transport: 'socket'

Process finished with exit code -1