There is a need to determine the state of a process and provide metrics
on the process. The current implementation of ODE provides the mechanism by
which to emit events (as defined in ODE Execution Events), and notify observers
of the event. The event structure lacks the process context (VariableData)
that may be needed by observers. I would like to propose that variableData
be added to the ScopeEvent so that observers have business context. Your
feedback on the proposed changes would be appreciated.
1. The ScopeEvent would be updated to include
private HashMap<String, String> variableData;
2. Populate variableData
All events get fired from ACTIVITY object. The following retrieves variable
data and populates variableData in the scope object.
In org.apache.ode.bpel.runtime.ACTIVITY replace the code for
sendEvent(ScopeEvent event) with the following code
protected void sendEvent(ScopeEvent event)
{
if (event.getLineNo() == -1 && _self.o.debugInfo != null)
{
event.setLineNo(_self.o.debugInfo.startLine);
}
_scopeFrame.fillEventInfo(event);
fillVariableInfo(event); // Add variableData to ScopeEvent
getBpelRuntimeContext().sendEvent(event);
}
/**
* Adds process context to the ScopeEvent as variableData
*
* @param event The ScopeEvent to which the process context is to be added
*/
protected void fillVariableInfo(ScopeEvent event)
{
HashMap<String,String> variableData = new HashMap<String,String>();
Iterator<String> variableNames =
_scopeFrame.oscope.variables.keySet().iterator();
while(variableNames.hasNext())
{
String name = variableNames.next();
String value = "";
Variable var = _scopeFrame.oscope.variables.get(name);
VariableInstance varInst = _scopeFrame.resolve(var);
try
{
Node varNode = getBpelRuntimeContext().fetchVariableData(varInst,
false);
value = DOMUtils.domToString(varNode);
}
catch (FaultException e)
{
}
variableData.put(name, value);
}
event.setVariableData(variableData);
}
Look forward to your commnets.
Thanks
- viraf
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