SAS/OR: The QSIM Application

Transactions

Transactions are generated in three components: Sampler, Transaction Pool, and Adder. Transactions are discrete entities that traverse the simulation network, and they can be used to represent physical and conceptual things such as a partially assembled refrigerator on an assembly line, a telephone call in a phone system, or an event such as a check on the size of a queue.

You can view the movement of transactions through the network by pressing the Animate button on the command panel. Bitmap images can be assigned to transactions in each of the three components in which they are generated. For example, the Transaction Image push button on the Sampler control panel opens a window from which you can choose an image to display on the transactions that originate at that Sampler. Figure 3.1 shows an example. Although Figure 3.1 shows the image SASHELP.ORIMG24.PHONE, any image in a SAS catalog can be used.

Figure 3.1: Setting an Image for a Sampler Transaction

When there are no references to transactions in the simulation the transaction is disposed of. This means that if a transaction does not reside in a queue, is busy in a server, is traversing an arc, or is being processed by another elementary component, it will be disposed of. You do not have to explicitly destroy them.

Transactions

Attributes

Trigger Messages

Timing Transaction Arrivals