Hi ,
As I am working in the project Monitoring* *a BPEL process on WSO2 BPS by
using WSO2 BAM, I was on finalizing the set of Events that is needed to
monitored by BAM. Mainly as identified it is necessary to identify when a
BPEL process get invoked and the number of times it got invoked. And also it
is necessary to identify how the partner services get invoked, in which
occasions does they get invoked and also maybe the number of times each
service get invoked. And also just like Milinda mentioned to me it is also
necessary to identify when the process get complete and whether it is
successfully responded to the client call.
ApacheODE provides and interface called MessageExchangeInteceptor which
contains four main methoda called ;
1. onBpelServerInvoked()
2. onProcessInvoked()
3. onNewInstanceInvoked()
4. onPartnerInvoked()
A test event observer class has been written extending the
MessageExchangeInteceptor interface and was able to run and identify what
are the events that get triggered against a bpel process which contains
several partner services. It was evident to me that the onProcessInvoked()
method and onPartnerInvoked() methods are responding well and caught events
whenever a bpel process got invoked and each time a partner service got
invoked. But the onBpelServerInvoked() and onNewInstanceInvoked() methods
were not working and I have informed it to the BPS team. But still the
MessageExchangeInteceptor has been able to answer some of the event
requiremnets. Today I was trying to retrieve more useful data from the
events that get caught by the onProcessInvoked() method and the
onPartnerInvoked() method, and found some very important data can be
retrieved . But there were some data that couldn't get retrieved as they
thrown Null pointer exceptions and couldn't continue running the bpel
process.
both the onProcessInvoked() and onPartnerInvoked() methods take
MessageExchangeInterceptor.InterceptorEvent object as a parameter
(InteceptorEvent is another static interface within the
MessageExchangeInteceptor) and can retrieve data from this object under four
main methods which are
1. org.apache.ode.bpel.dao.BpelDAOConnection getConnection()
2. org.apache.ode.bpel.dao.ProcessDAO getProcessDAO()
3. org.apache.ode.bpel.iapi.ProcessConf getProcessConf()
4. org.apache.ode.bpel.dao.MessageExchangeDAO()
under the onProcessInvoked() method I have successfully been able to
retrieve data for method calls such as...
System.out.println("onProcessInvoked: " +
ic.getProcessConf().getProcessId().toString());
("Time: "+ic.getMessageExchangeDAO().getCreateTime().toString());
("Type: "+ic.getProcessDAO().getType().toString());
("Version: "+ic.getProcessDAO().getVersion());
("Process ID: "+ic.getProcessDAO().getProcessId().toString());
("Num of Instances: "+ic.getProcessDAO().getNumInstances());
("processState : "+ic.getProcessConf().getState().toString());
and found throwing Null Pointer Exceptions to data retrival such as ....
//System.out.println("Callee:
"+ic.getMessageExchangeDAO().getCallee().toString());
("Channel: "+ic.getMessageExchangeDAO().getChannel());
("EPR: "+ic.getMessageExchangeDAO().getEPR().getBaseURI());
("PartnerLinkModelID: "+ic.getMessageExchangeDAO().getPartnerLinkModelId());
("Request data:
"+ic.getMessageExchangeDAO().getRequest().getData().getNodeValue());
("PartnerLink EPR:
"+ic.getMessageExchangeDAO().getPartnerLink().getMyEPR().getBaseURI());
under the onPartnerInvoked() method it had been able to retrieve data from
method calls such as given below.
System.out.println("onPartnerInvoked: " +
ic.getProcessConf().getProcessId().toString());
("Time: "+ic.getMessageExchangeDAO().getCreateTime().toString());
("PartnerLinkModelID: "+ic.getMessageExchangeDAO().getPartnerLinkModelId());
("PartnerLink MySessionId:
"+ic.getMessageExchangeDAO().getPartnerLink().getMySessionId());
and found throwing Null Pointer Exceptions to data retrival such as ....
//System.out.println("Request data:
"+ic.getMessageExchangeDAO().getRequest().getData().getNodeValue());
("PartnerLink EPR:
"+ic.getMessageExchangeDAO().getPartnerLink().getMyEPR().getBaseURI());
("PartnerLink RoleName:
"+ic.getMessageExchangeDAO().getPartnerLink().getMyRoleName());
("PartnerLink RoleServiceName:
"+ic.getMessageExchangeDAO().getPartnerLink().getMyRoleServiceName().toString());
("PartnerLink PartnerRoleName:
"+ic.getMessageExchangeDAO().getPartnerLink().getPartnerRoleName()
I found some of these failed data can be really useful when monitoring a
bpel process and I would like the bps team to take a look on this and find
if there is a way whether I can retrieve these data, and please give your
kind consideration on checking the necessity of these data for the projects.
And also I believe that there can be more important other data that may be
we can generate with in these methods to monitor a bpel process in an
interactive way. Request suggestions.
Thank You
IsuruW
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