Creating Reusable Event Triggers

Creating reusable event triggers enables you to model events more easily and quickly. You make the necessary settings once and then assign the trigger to more than one event in your process. The event trigger represents the web service endpoint of the process at runtime.

You can also use one and the same event trigger in multiple processes that are contained in the same project. Note that assigning the same message trigger to start events of multiple processes may result in starting all these processes together when the service interface is invoked. You have to specify different start conditions if this behavior is undesired. For more information about start conditions, see Modeling Events .

You can create the following types of reusable event triggers:

• Message trigger

  You use message triggers for modeling message start, intermediate message, and message end events. You create the message trigger from an operation of a service interface. To make service interfaces available, you can either import or create service interface definitions or WSDL files in your project.

  Note

  The trigger you assign to an intermediate message event must be created from an asynchronous service operation, because the intermediate message event cannot send back a response to the message sender.

  When there is a WSDL fault defined for an operation in the service interface definition, an error trigger is automatically created together with the message trigger. You cannot create a separate error trigger manually, but you can add a fault in the WSDL file and then create message and error triggers. You can use the error trigger to model error end events in your process.

• Escalation trigger

  You use escalation triggers to model escalation end events in the process. Escalation end events represent a business error that occurs in the process, for example an item runs out of stock in a purchase order process. All the deadlines that you define in a task can also trigger escalations when they are reached.

  When you create escalation triggers, you define the escalation type, which is an XSD type. In this way you define which data the escalation transports from the place it is thrown to the place where it is handled. You have the option of marking an escalation as critical.

Error and escalation end events can be handled by a respective boundary event. For more information about exception handling, see Modeling Exceptions and Exceptions Handling .

When you have created your event triggers, you can assign them to the events you model.

You can also create start and end events directly from event triggers when you drag and drop them on the modeling surface, or intermediate events when you drop a trigger on a sequence flow connection. When you drop an event trigger on an already modeled event, the trigger is updated with the one you dropped on the event.

• You have opened the Process Development perspective in the SAP NetWeaver Developer Studio and have expanded your project in Project Explorer view.

• You have the necessary service interface definitions in your project for creating message triggers. You make service interface definitions available in one of the following ways:

  • You can import service interface definitions. For more information, see Importing Service Interface Definitions .

    Note

    Some service interface definitions have a special attribute, isEvent , which is checked when you import them in your project. If the attribute is set to true , a message trigger is automatically created from this service interface definition and appears in the Messages node.

  • You can create service interface definitions and define operations and faults for them. For more information, see Creating Service Interface Definitions .

  • You can use the search capabilities in the Search Console view in the Developer Studio and directly drag and drop service interfaces from it to the modeling surface. The service interfaces appear in the WSDL Files node in Project Explorer view and you can use them to create message triggers. For more information, see Browsing Services in Search Console .

  • You can import Remote Function Call (RFC) modules from the ABAP back-end system. For more information, see Importing RFC Modules .