Get the connection speed when using HttpAsyncClient

Question

When use synchronous HttpClient, it's very easy to get the time of one request, just put System.currentTimeMillis() before and after the execute() method.

But when it comes to HttpAsyncClient, the execute() is asynchronous , which will just put the task into the queue. So I don't know how to get the start time of a connection.

The end time of a connection is easy, just call System.currentTimeMillis() in the OnComplete() method of the class instance FutureCallback<HttpResponse>

Both the synchronous HttpClient and asynchronous HttpAsyncClient have three phases, ConnectRequestTime, ConnectTime, SocketTime. All requests will be queued before actually get execution. if we call long start=System.currentTimeMillis() in HttpAsyncRequestProducer.html#generateRequest(), we just take a note of the start time when the request is sent to the internal queue, so at last what you get is ConnectRequestTime+ConnectTime+SocketTime, when you do a benchmark to test a batch requests, it's fine, but to test each single request, we need to substract ConnectRequestTime.

So my real question is how to get the time of ConnectRequestTime?

Answer 1

HttpAsyncRequestProducer.html#generateRequest() should be the right place.

You might also want to have a look at this as an example of how to squeeze maximum performance out of Apache HttpAsyncClient when doing micro benchmarking.