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
Oleg
[1]
http://hc.apache.org/httpcomponents-client/httpclient/xref/org/apache/http/impl/conn/DefaultClientConnection.html
[2]
http://hc.apache.org/httpcomponents-core/httpcore/xref/org/apache/http/impl/AbstractHttpClientConnection.html
[3]
http://hc.apache.org/httpcomponents-client/httpclient/xref/org/apache/http/impl/conn/DefaultClientConnection.html#166
[4]
http://hc.apache.org/httpcomponents-client/httpclient/apidocs/org/apache/http/impl/conn/ProxySelectorRoutePlanner.html
Cheers,
Chris.
2008/11/23 Oleg Kalnichevski <[EMAIL PROTECTED]>
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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