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From Andreas Veithen <>
Subject Re: [TCPMON] request / response
Date Tue, 21 Jul 2009 21:37:34 GMT

Please see my questions/comments inline.



On Sat, Jul 11, 2009 at 06:49, Neuberger, Nicholas
(EHQ)<> wrote:
> I'll give everyone a quick status of our progress on extending TcpMon with a record /
playback functionality.
> Here's what we have now, but there are a few flaws.
> New Feature:
> *Added record / playback feature that is SOAP centric (this was our primary need).

What kind of SOAP processing framework does it use?

> **Added record / playback icon on the screen to turn on feature.

Did you integrate that into the Swing UI or the Eclipse plugin?

> *When R/P feature is on the following occurs:
> The incoming request is analyzed and parsed.  All SOAP header information and XML soap
request is parsed into a pojo/domain object.   The object is then checked to determine if
it is stored in the database.  We are currently using hashCode for object identity, which
appears to be a short term solution.

The parsing to POJO and the use of hashCode sounds like it's very
specific to your use case, or do I miss something?

> We compare the identity on the XML soap message only, and store other parts as additional
fields like the following:
> --If it isn't then a request to the backend remote host is forwarded and the response
is returned back to TcpMon and stored in the database.   Final the response is returned back
to the original request on the listening port.
> --If it is in the database, then the response from the db is returned back to the original
request on the listening port.
> Currently we are using Spring / Hibernate for the persistence layer and MySQL for the
local database.   Now current implementation with these api's probably won't mesh well with
a patch to an Apache project and GPL / Apache licensing.   Also, we are going looking at
building into the application an In-Memory database possibly (h2, hsqldb, or derby).

We already depend on Spring in other Apache projects. Not sure about
Hibernate though. For the database, Derby should be fine.

> The current implementation we have is SOAP centric but could possibly be enhanced for
other things as well.  And there are issues with using hashCode on the soap envelope.  
If any request comes in with any different value, then the remote server is called, which
in some development cases, you wouldn't want that.   In one scenario, a developer would want
to always return the same response no matter what.   Basically, an override table that if
a request with a soap action of: findMyWidgets   then always return a default down response.
> Thoughts?   I'm open to any suggestions, criticism, ideas.

Some other questions that come to my mind:
- Is the feature completely optional, i.e. can TCPMon still be used as
before (in particular without the need to configure the database
connection) if the user doesn't need the R/P feature?
- What is the amount of change to the existing code base?

> Nick
> -----Original Message-----
> From: Andreas Veithen []
> Sent: Saturday, June 20, 2009 6:47 AM
> To:
> Subject: Re: [TCPMON] request / response
> I agree. The feature is interesting in itself, and will also allow us
> to improve the architecture of TCPMon.
> Andreas
> On Fri, Jun 19, 2009 at 04:32, Sanjiva Weerawarana<> wrote:
>> 2009/6/18 Neuberger, Nicholas (EHQ) <>
>>> Thanks a ton for the complete explanation of the core API.  This will help
>>> a great deal for me to get started.   I'll let you know my progress in the
>>> next day or two.
>>> I may ask your input on if you see this possible record/playback feature as
>>> a nice feature to TCPMon.   If you find it valuable to contribute to the
>>> community let me know.
>> Its a great feature - I'd love to see it contributed!
>> Sanjiva.
>> --
>> Sanjiva Weerawarana, Ph.D.
>> Founder, Director & Chief Scientist; Lanka Software Foundation;
>> Founder, Chairman & CEO; WSO2, Inc.;
>> Member; Apache Software Foundation;
>> Visiting Lecturer; University of Moratuwa;
>> Blog:

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