Receiving and Providing instance roles

Scripting
1

Hi,

In trying to figure out what Instance roles my sequence messages come from, I try the following in python4Capella:

sequence_msg = d.get_invoking_sequence_messages();
  for s in sequence_msg:
    print(s.get_receiving_instance_role())

However, I get the error saying :

py4j.protocol.Py4JError: An error occurred while calling 06545.getReceivingInstanceRole. Trace:
py4j.Py4JException: Method getReceivingInstanceRole([]) does not exist
at py4j.reflection.ReflectionEngine.getMethod(ReflectionEngine.java:318)
	at py4j.reflection.ReflectionEngine.getMethod(ReflectionEngine.java:326)
	at py4j.Gateway.invoke(Gateway.java:274)
	at py4j.commands.AbstractCommand.invokeMethod(AbstractCommand.java:132)
	at py4j.commands.CallCommand.execute(CallCommand.java:79)
	at py4j.ClientServerConnection.sendCommand(ClientServerConnection.java:244)
	at py4j.CallbackClient.sendCommand(CallbackClient.java:384)
	at py4j.CallbackClient.sendCommand(CallbackClient.java:356)
	at py4j.reflection.PythonProxyHandler.invoke(PythonProxyHandler.java:106)
	at com.sun.proxy.$Proxy27.executeScript(Unknown Source)
	at org.eclipse.ease.lang.python.py4j.internal.Py4jScriptEngine.internalExecute(Py4jScriptEngine.java:236)
	at org.eclipse.ease.lang.python.py4j.internal.Py4jScriptEngine.execute(Py4jScriptEngine.java:226)
	at org.eclipse.ease.AbstractScriptEngine.inject(AbstractScriptEngine.java:245)
	at org.eclipse.ease.AbstractScriptEngine.run(AbstractScriptEngine.java:309)
	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63)

Which makes me think the method is not implemented rather than me using it wrong. Any tips? They are greatly appreciated!

2

The method getReceivingInstanceRole() doesn’t exist in the Java class. You can replace the sending/receiving methods with the following code in the capella.py file:

    def get_sending_instance_role(self):
        """
        """
        part =  self.get_java_object().getSendingPart()
        if part is None:
            return part
        else:
            value = part.getType()
            if value is None:
                return value
            else:
                e_object_class = getattr(sys.modules["__main__"], "EObject")
                specific_cls = e_object_class.get_class(value)
                return specific_cls(value)
    def get_receiving_instance_role(self):
        """
        """
        part =  self.get_java_object().getReceivingPart()
        if part is None:
            return part
        else:
            value = part.getType()
            if value is None:
                return value
            else:
                e_object_class = getattr(sys.modules["__main__"], "EObject")
                specific_cls = e_object_class.get_class(value)
                return specific_cls(value)

I opened the following issue:

3

Hi Yvan,
Thanks for the reply! It all seems to work now.
May I ask where I could have found both the getSendingPart() and getReceivingPart() functions? They look like they belong to the java object, but how can I inspect that? That would certainly speed up development.
Thanks in advance!

Daan Hendriks

4

Both methods are declared in the Java implementation of Capella:

The Capella metamodel code is in this plugin for more details.

5

Very nice, I had not yet found this.
Thanks a lot!