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Finite State Machines in Software Build 39 barcode in Software Finite State Machines

Finite State Machines use software code 39 extended integration toembed ansi/aim code 39 on software Android on top of Software Code 39 Extended the same state on the rst statechart. This can be repeated as necessary, depending on how many partial statecharts need to be integrated. Given the complete at statechart, the next step is to develop hierarchical statecharts where possible.

There are actually two main approaches to developing hierarchical statecharts. The rst approach is a top-down approach to determine major high-level states, sometimes referred to as modes of operation. For example, in an airplane control statechart, the modes might be Taking Off, In Flight, and Landing.

Within each mode, there are several states, some of which might in turn be composite states. This approach is more likely to be used in complex real-time systems, which are frequently highly state-dependent. The second approach is to rst develop a at statechart and then identify states that can be aggregated into composite states, as described in Section 10.

8.4..

10.8 EXAMPLE OF DEVELOPING A STATECHART FROM A USE CASE To illustr 3 of 9 barcode for None ate how to develop a statechart from a use case, consider the ATM Control statechart from the Banking System case study.. 10.8.1 Develop Statechart for Each Use Case The use ca Software Code 39 ses for the Banking System are given in 21. In this example, we will consider the use cases for Validate PIN and Withdraw Cash. Both use cases describe the sequence of interactions between the actor the ATM Customer and the system, in which PIN validation precedes withdrawing cash.

For each use case, a statechart is constructed as illustrated in Figures 10.14 and 10.15.

Figure 10.14. Idle Card Inserted / Get PIN Entry / Display Welcome Waiting for PIN PIN Entered / Validate PIN Validating PIN Valid PIN / Display Menu, Update Status Waiting for Customer Choice Figure 10.14. Statechart for ATM Control: Validate PIN use case Software Modeling Idle Entry / Display Welcome After (Ela barcode code39 for None psed Time) [Closedown Not Requested]. Terminating Card Ejected / Display Ejected Ejecting Receipt Pr inted / Eject Waiting for Customer Choice Printing Withdrawal Selected / Request Withdrawal, Display Wait. Cash Dispensed / Print Receipt, Display Cash Dispensed, Confirm Cash Dispensed Dispensing Processing Withdrawal Withdrawal Approved / Dispense Cash, Update Status Figure 10.15. Statechart for ATM Control: Withdraw Funds use case shows the barcode 3 of 9 for None statechart for the main sequence of the Validate PIN use case depicting the scenario in which the PIN is valid, as described in Section 10.4.1.

This statechart starts in Idle state and ends in Waiting for Customer Choice state. Figure 10.15 shows the statechart for the Withdraw Funds use case corresponding to the main scenario of the use case.

This statechart starts in Waiting for Customer Choice state. In the main scenario, withdrawal is selected (resulting in transition into Processing Withdrawal state), withdrawal is approved (resulting in transition to Dispensing state), cash is dispensed (resulting in transition to Printing state), a receipt is printed (resulting in transition to Ejecting state), the card is ejected, transition into Terminating state for a xed period, and nally return to Idle state, when the period elapses. In this example, the states of the ATM statechart are all externally visible; that is, the actor is aware of each of these states.

In fact, the states depict consequences of actions taken by the actor, either directly or indirectly.. 10.8.2 Consider Alternative Sequences After the Code 3 of 9 for None rst version of the statechart is completed, further re nements can be made. To complete the statechart, it is necessary to consider the effect of each alternative sequence described in the Alternatives section of the use cases. Figure 10.

9 shows the Validate PIN statechart with the alternative sequences added to the main sequence, as described in Section 10.4.1.

Figure 10.16 shows the Withdraw Funds statechart with the alternative sequences added to the main sequence. Thus, in.

Finite State Machines Idle Entry / Display Welcome After (Ela psed Time) [Closedown Not Requested]. Terminating Card Ejected / Display Ejected Ejecting Waiting for Customer Choice Rejected / Eject Receipt Printed / Eject Printing Withdrawal Selected / Request Withdrawal, Display Wait Cash Dispe 3 of 9 barcode for None nsed / Print Receipt, Display Cash Dispensed, Confirm Cash Dispensed Dispensing Withdrawal Approved / Dispense Cash, Update Status Insufficient Cash / Eject. Processing Withdrawal Closed Down Entry / Display System Down Figure 10.16. Statechart for ATM Control: Withdraw Funds use case with alternatives addition t Software Code 3 of 9 o the main sequence for the scenario in which cash is dispensed, there are two additional scenarios: withdrawal transaction rejected (transition directly from Processing Withdrawal state to Ejecting State) and insuf cient cash in ATM (transition from Dispensing state to Closed Down State).. 10.8.3 Develop Integrated Statechart The integr Software ANSI/AIM Code 39 ated statechart consists of the integration of the use case based statecharts, after consideration of alternatives. Thus, the statecharts depicted in Figures 10.9 (Validate PIN use case with alternatives) and 10.

16 (Withdraw Cash use case with alternatives) are combined with the statecharts for the other use cases. This statechart would represent the main sequence through each use case together with the alternatives. Figure 10.

17 shows the integrated statechart from the Validate PIN and Withdraw Cash statecharts, with main and alternatives sequences. The main statechart integration point is Waiting for Customer Choice state, the end state for Validate PIN statechart, and the initial state for Withdraw Funds (and also Transfer Funds and Query Account) statechart. However, other statechart integration points are the Ejecting and Con scating states for the alternative scenarios of Validate PIN.

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