How can I intercept a Tomcat request at socket level?

Question

Hi,

I'm doing a performance study for a web application framework running on Apache Tomcat 6.

I'm trying to measure the time overhead of handling HTTP requests.

What I would like to do is:

/

// just before first request byte is read
long t1 = System.nanoTime();

// request is processed...

// just after final byte is written to response
long t2 = System.nanoTime();

/

Then I would compute the total time (t2 - t1).

Is there a way to do this? Thanks for your help!

Answer 1

One alternative, that wouldn't require any coding at all, is to look at the network traffic with a tool like Wireshark.

Answer 2

I think you can achieve this by adding a Filter and put your timing code before and after your call to doFilter on the rest of the filter chain.

Answer 3

The best way to track this is probably with a Valve.

But I would be surprised if this isn't already tracked in the MBeans that Tomcat exports. In particular, the MBean Catalina:name=http-<my port num>,type=GlobalRequestProcessor lists the following attributes:

bytesSent=51829989
bytesReceived=0
processingTime=11464
errorCount=8
maxTime=1250
requestCount=923
modelerType=org.apache.coyote.RequestGroupInfo

Take a look at the documentation on Monitoring and Managing Tomcat to figure out how to access these MBeans with JMX.

Answer 4

AspectJ you solution. Using it you can do anything__ with classes loaded by application CL(but not by bootstrap CL).