1
我正在嘗試構建一個REST Web服務器,其中GET請求是非阻塞的,即使它需要進行一個稍微耗時的調用。爲什麼在我的應用程序中連續執行Spring DeferredResult?
@RestController
public class Endpoint {
static int callCount = 0;
@RequestMapping (value = "/endpoints", method = RequestMethod.GET)
public DeferredResult<Integer> someGetMethod() {
System.out.println("Mita: GET Called. Count#: " + callCount++);
DeferredResult<Integer> deferredResult = new DeferredResult<>();
new Thread(() -> {
deferredResult.setResult(getSomething());
}).start();
System.out.println("Mita: Thread started");
return deferredResult;
}
private int getSomething() {
try {
Thread.sleep(5000);
} catch (InterruptedException e) {
e.printStackTrace();
}
return 100;
}
}
爲了測試,我發送了兩個GET請求,從Restlet到同一端點,間隔約2秒。但是,我在我的spring應用程序的DEBUG級日誌中看到以下內容。
2017-08-26 01:16:38.231 DEBUG 1252 --- [nio-8080-exec-1] o.a.coyote.http11.Http11InputBuffer : Received [GET /endpoints/ HTTP/1.1
Host: localhost:8080
Connection: keep-alive
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.101 Safari/537.36
Accept: */*
DNT: 1
Accept-Encoding: gzip, deflate, br
Accept-Language: en-US,en;q=0.8,es;q=0.6,zh-CN;q=0.4,zh;q=0.2
]
...
...
2017-08-26 01:16:43.399 DEBUG 1252 --- [nio-8080-exec-2] o.a.coyote.http11.Http11InputBuffer : Received [GET /endpoints/ HTTP/1.1
Host: localhost:8080
Connection: keep-alive
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.101 Safari/537.36
Accept: */*
DNT: 1
Accept-Encoding: gzip, deflate, br
Accept-Language: en-US,en;q=0.8,es;q=0.6,zh-CN;q=0.4,zh;q=0.2
]
注意,兩個請求是怎麼來之後5秒,精確的時間間隔我稱睡眠(即使我後,第一個發送的請求〜2秒)。所以,看起來tomcat正在順序化傳入的請求。我如何讓tomcat不要序列化請求?或者是我錯過了一些非常明顯的東西。
你說得對。看起來Restlet是這裏的罪魁禍首。我使用JMeter測試了我的服務器,我可以看到大約100個併發呼叫在5000到5010毫秒之間返回。感謝您指出了這一點。 – Moni