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Comment: Published by Scroll Versions from space WDESIGNER and version 21.1.2
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Differences of Operations

Operations in a library can be static or non-static operations.

Tip

Use the execution pane context menu to display the parameter names / pin names.

  • Static operations are like functions. They have no self context, and thus no target pin - only input, output, and return pins.

  • Non-static operations provide a self context. When added to the execution pane, they provide a target pin in addition to the parameters. Here, the user should provide the related element.

You have two options to determine the target of a non-static operation:

  • Check the library: The needed target is the class where the operation resides in.
  • Hover over the target pin: The type of the expected target will be displayed on the execution pane.

Adding Operations

Select the operation you want to use from the service panel.

Drag & d rop the operation to the operations flow in the execution pane.

Tip

Go to page Adding Variables for detailed information.

When the operation has been added to the operations flow, the displayed pins indicate needed object flows.

Tip

Hover over a pin to see the name and the type of the expected object flow.

Pins on the left of the action node indicate needed incoming object flow.

Pins on the right indicate outgoing object flow.

Target pins indicate the target of the operation which is the element to which the operation is to be applied.

Now you need to connect the pins with the corresponding variables. Depending on which data is required, you can use variables from the Persisted or Local section.

  • Local: Draw a relation between the operation pin to the variable in section Local.
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  • Persisted: Open the list of available persisted variables by using the icon in section Persisted and select the needed variable.
Tip

Go to page Persisting Data for detailed information about persisted variables.

You can use the search to narrow down the content of the list.

When the persisted variable is displayed on the execution pane, draw the necessary object flow to the operation call.

The color of the pins assists you during modeling, see Pin Highlighting for detailed information.

Object flows on the execution pane are routed automatically.

You can use the execution pane context menu to change the algorithm of the relation path.

You can select an object flow to highlight it in blue - in larger models this helps to track the paths more easily.


You can also hover over an object flow to highlight it in black.

Pin Highlighting

While dragging the object flow, the color of the pins assists you.

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When you start dragging an object flow, all pins of the same type and multiplicity are marked blue. Blue pins indicate that the relation will be valid.

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White pins indicate that you are trying to connect pins that do not have the same type or multiplicity. The pins are marked in white only when you have reached them with the mouse pointer.

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It will be possible to draw a connection to a white pin, but the relation will be invalid and displayed in red.

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A pin turns red if a relation cannot be created at all.

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For example, you cannot connect a local variable with another local variable, a persisted variable with another persisted variable, or draw a connection to a pin that is already connected.

Special Case: Guard Expressions

Guard expressions (conditions) of exclusive gateways are implemented to the outgoing relations of the gateway.

If you select the outgoing relation of an exclusive gateway on the diagram pane, section Return is displayed in the execution pane automatically.

This section contains the unchangeable object return of type Boolean.

Operations that should be able to be used on a guard need to have a Boolean return value. This value should transport the following meaning:

  • true if the process flow should be continued on this branch.
  • false if this branch should be omitted.

Set the return value of the guard expression by connecting the output pin of the operation call to the return object.

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