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Process Starters

Some activities are used to start a process when an event occurs. For example, in the File palette, there is an activity named File Poller. This activity detects changes in a specified file and starts a process when the change occurs. This kind of activity is known as a process starter. When a process starter is placed into a process definition, it replaces the default Start activity, and becomes the first activity in the process.

You can only have one process starter in a process definition. You will receive a warning if you attempt to add more than one process starter to a process definition. Table 9 describes the available process starters.

When you deploy your project, you can place processes with different process starters on different machines. For example, you may wish to place all processes with a Receive Mail process starter on the same machine as the mail server so that the processes can poll the mail server more efficiently. See TIBCO ActiveMatrix BusinessWorks Administration for more information about deployment and specifying where process starters run.

Table 9 Process starters

Palette	Process Starter	Starts a process when...
ActiveEnterprise Adapter	Adapter Subscriber Adapter Request-Response Server	A message or a request from an adapter is received.
File	File Poller	The specified file is created, changed, or deleted.
General Activities	Timer	The specified time interval occurs. You can start processes for one-time events or schedule processes to start on recurring time intervals.
	Receive Notification	A corresponding Notify activity has executed.
HTTP	HTTP Receiver	An HTTP request is received.
JMS	JMS Queue Receiver JMS Topic Subscriber	Either a JMS queue or topic message is received.
Mail	Receive Mail	Mail for the specified user is received by the mail server.
Rendezvous	Rendezvous Subscriber	A TIBCO Rendezvous message is received.
SOAP	SOAP Event Source	A SOAP web services request is received.

Misc Tab

All process starters have a Misc tab that allows you to configure features common to all process starters. The Misc tab contains the following fields:

Field	Description
Sequencing Key	This field can contain an XPath expression that specifies which processes should run in order. Process instances whose sequencing key evaluates to the same value will be executed sequentially in the order in which the process instance was created. See Chapter 12, Process Instance Execution for more information about controlling the execution order of process instances. See Chapter 9, XPath for more information about XPath expressions.
Custom Id	This field can contain an XPath expression that specifies a custom ID for the process instance. This ID is displayed in the View Service dialog of TIBCO Administrator, and it is also available in the $_processContext process variable. See Chapter 9, XPath for more information about XPath expressions. See Chapter 7, Working With Variables for more information about process variables.

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