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Configuration parameters

Before defining additional instances, create a configuration parameter group (dhtParameterGroup) and a configuration parameter to use repeatedly with each instance. All instances are going to use the same messaging process instance (dhtDMServer) to communicate with each other. Create a configuration parameter associated with the dhtDMServer for use in all other instances. If changes are made to the messaging server instance, then only a single change in the instance reference is required rather than having to edit each of the process instances. In this sense, configuration parameters provide a way to add flexibility points in the system to make it more modular.

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Create a configuration parameter group to hold the configuration parameter. In this system, only one configuration parameter will be created, but in a real system, there might be many more, so creating a group to hold them would be advantageous.

Right-click on the dhtPackage folder and select New parameter group from the context menu.

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A dialog appears. Enter the following information into the dialog and click Add.

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The parameter group editor appears. Click the Save button in the parameter group editor and the parameter group appears in the tree.

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Right-click on the parameter group and select New Parameter Override.

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A dialog appears. Enter the following information into the dialog and click Add.

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The Parameter Editor appears at the bottom of the screen.

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Associate the dhtDMServer process instance to the attribute values. Click the Add button at the top of the editor.

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Type the process instance name into the dialog and click Add.

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Click the Save button at the top of the editor.

The Package tree should look like this:

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