To: SO team,
The service task java (actually spring bean) invocation using the expression
implementation method is as follows, for example:
${VnfAdapterImpl.preProcessVnfAdapter(InjectExecution.execute(execution,
execution.getVariable(“gBuildingBlockExecution”)))}
The InjectExecution.execute function, basically, gets the first
DelegateExecution execution and second DelgateExecutionImpl impl parameters,
sets the execution object into the impl object, and returns the impl object
because the called function (e.g., VnfAdapterImpl.preProcessVnfAdapter) needs
the BuildingBlockExecution object parameter.
To me, this InjectExecution.execute method works for BuildingBlockExecution
only; it is not a general purpose function for injecting any variables. All the
Building Block Service Task invocations use the “same” second parameter -
boilerplate.
The BuildingBlockExecution is a superset of the Camunda DelegateExecution. The
BB service tasks do not use the DelegateExpression implementation (which
injects the Camunda DelegateExecution object implicitly).
The BB service tasks use the Expression implementation for method flexibility
and for our business need (e.g., for additional fields, seedMap). This method
works, but passing the same second parameter, which can be extracted from the
first parameter execution is not convenient. We can simplify by doing:
${VnfAdapterImpl.preProcessVnfAdapter(InjectExecution.execute(execution,
execution.getVariable(“gBuildingBlockExecution”)))}
-->
${VnfAdapterImpl.preProcessVnfAdapter(Inject *BB*
Execution.execute(execution))} // we can get the
BuildinBlockExecution object from the BPMN workflow before calling this, but
that needs a script task. Eh…
Since the InjectExecution.execute works for BuildingBlockExecution, we can
rename it to Inject *BB* Execution and extract the gBuildingBlockExecution from
the first execution parameter, such as:
@Component
Public class InjectBBExecution {
Public DelegateExecutionImpl execute (DelegateExecution execution) {
DelegateExecutionImpl impl = (DelegateExecutionImpl)
execution.getVariable(“gBuildingBlockExecution”);
If (impl != null } {
impl.setDelegateExecution(execution);
} else {
// error condition
}
return impl;
}
}
If I miss something here, please advise.
Thanks.
Byung
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