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Figure 9.4 shows a simple model where the scanning process
controls the periodic searching of the queue in the main process.
The sampler in the section labeled
"Scanning Process" has deterministic,
inter-arrival time distribution so that at fixed times
a transaction gets a formula and goes to the Trigger that starts
the scan of the queue.
The formula has
where the
transaction attribute is random.
Since the trigger is set to the queue in the main process
and the filter trigger message, when the transaction
arrives at the Trigger, the
queue is scanned and each
transaction whose value of the random attribute is
less than .8 is balked.
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