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From "Dave Rathnow" <Dave.Rath...@umsltd.com>
Subject RE: Measuring bytes sent and received from and to Tomcat
Date Thu, 25 Oct 2007 20:24:41 GMT

Hello Again,

I was wondering if someone could give me some help with this.  I think
using a connector is probably the way to go to solve this problem;
however, I'm not sure where to start.  How do I create my own connector
and the plumb it into Tomcat so it will be used. I will be using a
separate port other than 8080 for the devices that will be sending and
receiveing data so, if possible, I would like to leave the default
connector on port 8080.

Again, I don't want to reimplement the code that parses the HTTP.  All I
need to do is count the number of bytes arriving and being sent so if I
can reuse code from an existing connector, that would be great.

Thanks,
Dave. 

-----Original Message-----
From: costin@gmail.com [mailto:costin@gmail.com] On Behalf Of Costin
Manolache
Sent: October 22, 2007 04:50 PM
To: Dave Rathnow
Cc: Tomcat Developers List
Subject: Re: Measuring bytes sent and received from and to Tomcat

Well, if you want absolute byte - connector seems the only place, there
are space and tabs beeing skipped when parsing headers, etc.

If you are ok with an estimate - the AccessLogValve is ok, add all the
header lengths + method + http/1.1. You'll miss bytes for encodings,
spaces.

Re. where to add - each connector is different on how it reads/parse the
message, you probably want to do it close to the 'read()' call, save it
somewhere associated with the request ( a note or attribute ) and read
it in a valve or filter.

Costin


On 10/22/07, Dave Rathnow <Dave.Rathnow@umsltd.com> wrote:
>
>
> I looked at connectors but wasn't sure if this was what I wanted.  To 
> avoid anther wild goose chase I decided to ask.  Can you point me in 
> the direction of some documentation where I might be able to get
started?
>
> Dave.
>
> -----Original Message-----
> From: Costin Manolache [mailto:costin@gmail.com]
> Sent: October 22, 2007 04:28 PM
> To: Tomcat Developers List
> Subject: Re: Measuring bytes sent and received from and to Tomcat
>
> 'bytes' should be counted at a lower level, in connector. I'm not sure

> this is something generic enough - but you can make some changes to 
> your tomcat, where read() is done from socket.
>
> I guess it would be nice to have a JMX graph with bytes/sec in/out.
>
> Costin
> 'bytes'
>
> On 10/22/07, Dave Rathnow <Dave.Rathnow@umsltd.com> wrote:
> >
> >
> > We looked at using a valve but we weren't sure if it would work.
> > Correct me if I'm wrong, but it appears as though valves are chained

> > together in a calling sequence and that some valves could change the

> > content of the request or response.  This means we may not get an 
> > accurate measure of the number of total number bytes that make up 
> > the request.
> >
> > Also, the AccessLogValve has a pattern code to get the number of 
> > bytes
>
> > sent, excluding the HTTP headers, but does not have a pattern code 
> > to get the number of bytes sent, including the HTTP headers, which 
> > is what we really need.
> >
> > Have I missed something?
> >
> > Dave.
> >
> >
> > -----Original Message-----
> > From: yoavshapira@gmail.com [mailto:yoavshapira@gmail.com] On Behalf

> > Of Yoav Shapira
> > Sent: October 22, 2007 02:36 PM
> > To: Tomcat Developers List
> > Subject: Re: Measuring bytes sent and received from and to Tomcat
> >
> > Hey,
> >
> > On 10/22/07, Dave Rathnow <Dave.Rathnow@umsltd.com> wrote:
> > > Is there a way we can do the same thing with Tomcat?  It's simple 
> > > for us to measure the number of byte in the payload of the HTTP 
> > > request/response, however that isn't enough.  We need to know the 
> > > total number of bytes being sent and received for each HTTP
request.
> > >
> > > Can someone suggest a way I could get an accurate count of these
> > bytes?
> >
> > You can probably start with the AccessLogValve that ships with
Tomcat:
> > http://tomcat.apache.org/tomcat-6.0-doc/config/valve.html
> >
> > Out of the box it will get you the complete bytes in the response.
> > See the above docs on how to configure that.  If you want to log the

> > complete bytes on the request, I think you'll have to extend the 
> > Valve, but it should be pretty easy to do.
> >
> > Yoav
> >
> > --------------------------------------------------------------------
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> >
> >
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> >
> >
>

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