For now --Srinath
---------- Forwarded message ---------- From: Peter De Roovere <peter.de.roov...@gmail.com> Date: Tue, Mar 24, 2009 at 8:36 AM Subject: Re: question regarding master's thesis: SOA-governance on Axis2 To: Srinath Perera <hemap...@gmail.com> Dear Srinath, thank you for your previous reply. My project is going very well, but I am struggling with one final issue. I want to display faults in SOAP-communication, using handlers in Axis2. I understand the InFaultflow and OutFaultFlow are not the overall solution to deal with faults in Axis2. Could you give me some tips about catching fault messages? For example: when a service endpoint is not found, is it possible to intercept an HTTP 404 message for example? If not, what kind of SOAP-fault messages are intercepted in the In- and OutFaultFlow? Thank you very much for your help! Regards, Peter 2009/3/16 Srinath Perera <hemap...@gmail.com> > > Hi Peter; > > Usually you may use operation context to correlate messages if two > messages are part of the same operation. (that is case 1 I think). But > it seems to me that the case two there are no relationship between two > messages. > > e.g. request to service A -> request to service B ... have a parent > child relationship if there are any relationship at all. AFAIK > WS-Specs does not specify how to do this. So most likely there is not > transparent way of doing this. You service can copy something (e.g. > request message ID)) to response message and you can use it to > correlate, but it is not transparent in the sense your service have to > know about this and explicitly do this. > > Ask me if you need more clarification. If you do not mind let us > discuss this in axis2-dev list, as we might get input from others as > well. > > Thanks > Srinath > > > > On Mon, Mar 16, 2009 at 5:57 AM, Peter De Roovere > <peter.de.roov...@gmail.com> wrote: > > Dear Axis2-developers, > > I am an engineering student from Leuven (Belgium) and I'm developing an > > application using Axis2 as part of my master's thesis project. > > The main goal of this application is to do SOA-governance and SOA-monitoring > > using custom-written handlers. These handlers (defined in Axis2) intercept > > incoming and outgoing SOAP-messages at different Axis2 environments, adding > > information to the header of these messages when going out and reading this > > information when coming in. Each time a message passes through an > > interception (handler), information is written in a database, and this > > information is used to make some assumptions about the monitored SOAs. > > The system is working properly for synchronous web services, but a problem > > occured when developing using asynchronous web services: > > I would like to pass some parameters from the incoming-handler (IN-flow) to > > the outgoing handler (OUT-flow) (for example: an ID that's read from the > > header at the entrance of a service, had to be put in the header of a > > corresponding message going out). > > So: the incomming handler has to pass information to the ougoing handler. > > There are 2 possible cases where this should happen: > > 1. the outgoing message is a response to a previously received incomming > > message. (the system is able to correlate these messages using the REPLYTO > > parameter, so no problem here) > > 2. the outgoing message is a request to another service, comming from a > > service that previously received a request itself (the incomming message to > > SERVICE A invokes an operation of this service, as a result of this > > operation, a request to SERVICE B is sent (outgoing)) > > This 2nd case is causing the problem. Is it possible to correlate an > > outgoing message (from the same service, operation) with a previously > > received incomming message, using asynchronous web services (this means it > > is not true that the first outgoing message corresponds to the last received > > incomming message)?? > > I hope you understand the problem I'm facing. > > Thank you very much for your time. > > Regards, > > Peter De Roovere > > > > > > -- > ============================ > Srinath Perera: > Indiana University, Bloomington > http://www.cs.indiana.edu/~hperera/ > http://srinathsview.blogspot.com/ -- ============================ Srinath Perera: Indiana University, Bloomington http://www.cs.indiana.edu/~hperera/ http://srinathsview.blogspot.com/
