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Real-Time Software Architecture Case Study in Software Drawer Code-39 in Software Real-Time Software Architecture Case Study




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Real-Time Software Architecture Case Study using barcode generator for none control to generate, create none image in none applications. MS Excel interface I none none AGVControl moveToStation (in destination, in load/Unload) arrivingAtStation (in station#). interface I AGVStatus update (in destination, in loadUnload) check (in currentStation#, out response) read (out AGVid, out location, out destination, out loadUnload) clear (). interface I none none Arm initialize () load () unload (). interface I Motor initialize () startMotor () stopMotor (). interface I none for none Display displayAGVStatus (in AGVStatus). Figure 24.17. Automated Guided Vehicle System component interface speci cations Figure 24.17. none for none It is kept simple by having only one operation, processControlRequest, which has an input parameter, controlRequest, that holds the name and contents of the individual message.

Having each control request as a separate operation would make the interface more complicated when considering evolution of the system because it would need the addition or deletion of operations rather than changing a parameter. The ports and interfaces of the periodic timer component are shown in Figures 24.16 and 24.

17. The Vehicle Timer has two required ports with two required interfaces. The rst required interface is IAGVStatus, which allows it to read AGV status information from the Vehicle Status data abstraction object.

The second required interface is IDisplay, which allows Vehicle Timer to send AGV status messages to Display Proxy.. data abstrac tion VehicleStatus - AGVid : Integer = 0 - destination : Integer = 0 - location : Integer = 0 - loadUnload : Boolean = unload + update (in destination, in loadUnload) + check (in currentStation#, out response) + read (out AGVid, out location out destination,out loadUnload) + clear (). state machine VehicleStateMachine + processEvent (in event, out action) + currentState () : State Figure 24.18. Vehicle Status data abstraction class and Vehicle State Machine class Case Studies The port and none none interface of the passive data abstraction object (Vehicle Status) are shown in Figures 24.16 and 24.17.

Vehicle Status provides one interface with three operations. The update operation stores the next AGV destination and the command to be executed there (load or unload). The check operation receives the current station number and returns whether this is the destination or not; if it is the destination, it also returns whether the station command is load or unload.

The read operation returns the location, destination, and load/unload command. The attributes of the Vehicle Status data abstraction class are given in Figure 24.18.

This gure also depicts the state machine class design for Vehicle State Machine, which is encapsulated inside the Vehicle Control component.. APPENDIX A Catalog of Software Architectural Patterns A template fo r describing a pattern typically addresses the following items from the perspective of the prospective user of the pattern:. Pattern name none for none Aliases. Other names by which this pattern is known. Context.

The situation that gives rise to this problem. Problem. Brief description of the problem.

Summary of solution. Brief description of the solution. Strengths of solution.

Use to determine if the solution is right for your design problem. Weaknesses of solution. Use to determine if the solution is wrong for your design problem.

Applicability. Situations in which you can use the pattern. Related patterns.

Other patterns to consider for your solution. Reference. Where you can nd more information about the pattern.

. The architect ural structure patterns, architectural communication patterns, and architectural transaction patterns are documented with this template in Sections A.1, A.2, and A.

3, respectively. The patterns are summarized in the following tables:. Table A.1. Software architectural structure patterns Software arch itectural structure patterns Broker Pattern Centralized Control Pattern Distributed Control Pattern Hierarchical Control Pattern Layers of Abstraction Pattern Multiple Client/Multiple Service Pattern Multiple Client/Single Service Pattern Multi-tier Client/Service Pattern Pattern description Section A.1.1 Section A.

1.2 Section A.1.

3 Section A.1.4 Section A.

1.5 Section A.1.

6 Section A.1.7 Section A.

1.8 Reference chapter 16, Section 16.2 18, Section 18.

3.1 18, Section 18.3.

2 18, Section 18.3.3 12, Section 12.

3.1 15, Section 15.2.

2 15, Section 15.2.1 15, Section 15.

2.3. Appendix A: Catalog of Software Architectural Patterns Table A.2. Software architectural communication patterns Software arch none for none itectural communication patterns Asynchronous Message Communication Pattern Asynchronous Message Communication with Callback Pattern Bidirectional Asynchronous Message Communication Broadcast Pattern Broker Forwarding Pattern Broker Handle Pattern Call/Return Negotiation Pattern Service Discovery Pattern Service Registration Subscription/Noti cation Pattern Synchronous Message Communication with Reply Pattern Synchronous Message Communication without Reply Pattern Pattern description Section A.2.1 Section A.

2.2 Reference chapter 12, Section 12.3.

3 15, Section 15.3.2.

Section A.2.3 Section A.

2.4 Section A.2.

5 Section A.2.6 Section A.

2.7 Section A.2.

8 Section A.2.9 Section A.

2.10 Section A.2.

11 Section A.2.12.

12, Section none none 12.3.3 17, Section 17.

6.1 16, Section 16.2.

2 16, Section 16.2.3 12, Section 12.

3.2 16, Section 16.5 16, Section 16.

2.4 16, Section 16.2.

1 17, Section 17.6.2 12, Section 12.

3.4; 15, Section 15.3.

1 18, Section 18.8.3.

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