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From Oleg Kalnichevski <ol...@apache.org>
Subject Re: Connection metrics with Http Client/Core
Date Sun, 23 Nov 2008 17:23:11 GMT
Chris Lowe wrote:
> Thanks Oleg. I presume you meant something like this for getting at the
> connection metrics?
> new HttpResponseInterceptor() {
>     public void process(final HttpResponse response,
>                             final HttpContext context) throws HttpException,
> IOException {
>                 final AbstractClientConnAdapter connAdaptor =
> (AbstractClientConnAdapter)
>                     context.getAttribute(ExecutionContext.HTTP_CONNECTION);
>                 HttpConnectionMetrics metrics = connAdaptor.getMetrics();
>         // ...
>     }
> }

Yes, that is exactly what I meant.

> Looking at the GZip example, for other stats like TTFB etc I could place an
> InputStream wrapper around the following line:
> InputStream wrappedin = wrappedEntity.getContent();

The best way to go about is to create a custom connection (class 
possibly by extending DefaultClientConnection [1]) and collecting 
additional metrics by overriding and decorating methods of the 
AbstractHttpClientConnection class [2].

You will also have to create a custom connection manager in order to 
provide a custom version of the ClientConnectionOperator interface to be 
used for creating client connections.

> But wouldn't potentially skew my results since presumably the InputStream
> reference that I get is already wrapped a few times and is buffered?
> Is there a way to get the genuine time to first byte from the underlying
> socket?

If you really need to control I/O on the socket level, you should 
decorate SessionInputBuffer and SessionOutputBuffer instances used by 
the client connection class. See how DefaultClientConnection adds socket 
level logging by decorating instances of those interfaces [3]

> BTW when I was looking at the GZip example, I added the code to my
> multithreaded implementation. It worked well.  However, I tried running the
> example with Charles HTTP proxy running so I could see the new headers
> coming through.  Normally adding "-Djava.net.useSystemProxies=true" to the
> JVM arguments routes all traffic through Charles but with HttpClient it did
> not. Is there anything else that I need to do in order to use the system
> proxy settings with HttpClient?

Use ProxySelectorRoutePlanner instead of the default one. By the way, a 
simpler way to see what packets get sent across the wire is by 
activating the wire log. Just configure whatever logging framework you 
are using beneath Commons Logging to set 'org.apache.http' category to 
DEBUG priority.

Hope this helps




> Cheers,
> Chris.
> 2008/11/23 Oleg Kalnichevski <olegk@apache.org>
>> Chris Lowe wrote:
>>> Hello,
>>> I'd like to use HttpClient 4.0b1 and HttpCore 4.0b3 to create a stress
>>> test
>>> application from which I need to get the following stats:
>>> Connection hand shake time;
>>> Time to first byte sent/recevied;
>>> Time to last byte received;
>>> Overall connection metrics - total bytes sent and received from all
>>> connections.
>>> Regarding overall metrics, I've seen
>>> DefaultHttpClientConnection.getMetrics() but I cannot see how I can access
>>> this information through something like ThreadSafeClientConnManager.
>>> Could anyone offer some pointers as to how I might derive these stats?
>>> Cheers,
>>> Chris.
>> Hi Chris
>> You should add a custom protocol interceptor, which would be able to get
>> hold of the underlying connection from the execution context
>> Here is an example how one can extend HttpClient capabilities by adding
>> custom protocol interceptors:
>> http://svn.apache.org/repos/asf/httpcomponents/httpclient/trunk/module-client/src/examples/org/apache/http/examples/client/ClientGZipContentCompression.java
>> Hope this helps
>> Oleg
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