Time-Triggered Business Events


Time-triggered business events are initiated by the arrival of a predetermined time (or date). For example, your insurance company sends you a renewal notice shortly before the anniversary of your policy. Your bank sends you a statement on the fifteenth day of every month (or on whatever day you have arranged to have it sent). "The arrival of a predetermined time" may also mean that a certain amount of time has elapsed since another event happened. For example, a computer operating system may check the available memory 2.4 microseconds after the last time it checked, or you may be sent a reminder that you borrowed a library book six weeks ago.

The usual response to a time-triggered business event is to produce some information and send it to an adjacent system. Consider the example depicted in Figure 4.4.

Figure 4.4.

A time-triggered business event happens when a prearranged time is reached. This is based on either a periodic occurrence (for example, the end of the month, or 5 P.M. each day), a fixed time interval (three hours since the last occurrence), or a certain amount of time elapsing since another business event (30 days after sending out an invoice). The normal response is to retrieve stored data and send some information to an adjacent system.


Once the predetermined time for the event arrives, the work's response is to do whatever is necessary to produce the output. This almost always involves the retrieval and manipulation of stored data. Once again, we use the response to the time-triggered business eventthe business use caseas our unit of study.




Mastering the Requirements Process
Mastering the Requirements Process (2nd Edition)
ISBN: 0321419499
EAN: 2147483647
Year: 2006
Pages: 371

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