如何使用 Java 11 标准 HTTPClient 测量 ASYNC 发送 HTTPRequest 的经过时间?
How to measure the elapsed time of ASYNC sent HTTPRequest with Java 11 standard HTTPClient?
在一种方法中,我创建并发送一些异步 HTTPRequests,并将 CF 添加到列表中:
// HTTPClient is Java11 standard, package java.net.http;
CompletableFuture<HttpResponse<String>> httpResponseCF = this.httpClient.sendAsync(httpRequest, BodyHandlers.ofString());
list.add(httpResponseCF);
稍后,在另一种方法中,我每 1 秒定期检查我的一些异步发送的 HTTPRequests 是否已经收到:
for(CompletableFuture<HttpResponse<String>> httpResponseCF : list){
if (httpResponseCF.isDone()) {
//print out: The time between sending HTTPRequest and receiving HTTPResponse is 25ms
}
}
问题是,如何测量准确的请求时间?
像下面这样的东西应该可以解决问题:
long start = System.nanoTime();
CompletableFuture<HttpResponse<String>> httpResponseCF =
this.httpClient.sendAsync(httpRequest, BodyHandlers.ofString()).
whenComplete((r,t) -> System.out.println("elapsed ns: "
+ (System.nanoTime() - start)));
免责声明:我实际上并没有编译以上...
它也不是精确时间,而是您可以获得的最佳近似值。与所有事物一样,确切时间 无法测量。
在一种方法中,我创建并发送一些异步 HTTPRequests,并将 CF 添加到列表中:
// HTTPClient is Java11 standard, package java.net.http;
CompletableFuture<HttpResponse<String>> httpResponseCF = this.httpClient.sendAsync(httpRequest, BodyHandlers.ofString());
list.add(httpResponseCF);
稍后,在另一种方法中,我每 1 秒定期检查我的一些异步发送的 HTTPRequests 是否已经收到:
for(CompletableFuture<HttpResponse<String>> httpResponseCF : list){
if (httpResponseCF.isDone()) {
//print out: The time between sending HTTPRequest and receiving HTTPResponse is 25ms
}
}
问题是,如何测量准确的请求时间?
像下面这样的东西应该可以解决问题:
long start = System.nanoTime();
CompletableFuture<HttpResponse<String>> httpResponseCF =
this.httpClient.sendAsync(httpRequest, BodyHandlers.ofString()).
whenComplete((r,t) -> System.out.println("elapsed ns: "
+ (System.nanoTime() - start)));
免责声明:我实际上并没有编译以上... 它也不是精确时间,而是您可以获得的最佳近似值。与所有事物一样,确切时间 无法测量。