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Images/TT_tree_desktop.jpg' alt='Advantages Conventional File Processing System' title='Advantages Conventional File Processing System' />Personal Finance How To Information. Advantages Conventional File Processing System' title='Advantages Conventional File Processing System' />Hierarchical State Machine Design Pattern. In this article, we will be highlighting the advantages of hierarchical state. In conventional state machine design, all states are considered at the same. The design does not capture the commonality that exists among states. In. real life, many states handle most  messages in similar fashion and differ. Even when the actual handling differs. Hierarchical state machine design captures the. The states at the higher. The table given below shows the mapping between conventional. Conventional States. Hierarchical States. Awaiting First Digit. Setup. Collecting. Digits. Awaiting. First. Digit. Collecting Digits. Setup. Collecting. Digits. Awaiting. Subsequent Digits. Routing Call. Setup. Routing. Call. Switching Path. Setup. Switching. Path. Conversation. A window is a usually rectangular portion of the display on a computer monitor that presents its contents e. DBMS A database management system is the software system that allows users to define, create and maintain a database and provides controlled access to the data. Introduction. Conventional radar systems comprise a collocated transmitter and receiver, which usually share a common antenna to transmit and receive. Conversation. Awaiting Onhook. Releasing. Awaiting. Onhook. Releasing Path. An audio program and message distribution system in which a host system organizes and transmits program segments to client subscriber locations. The host organizes. Releasing. Releasing. Path. A conventional state machine is designed as a two dimensional array. The state machine determines the message handler to be called by. In real life scenario. This leads to a message handler code explosion. Also, a huge two. Hierarchical state machine design. When a new hierarchical state is defined, only the state. Conventional State Machine Example. The figure below describes the state transition diagram for an active standby. The design here assumes that the active and standby are being managed by. The different states for the state machine are Active, Standby, Suspect and. Failed. The input messages to be handled are Switchover, Fault Trigger. Diagnostics Passed, Diagnostics Failed and Operator Inservice. Thus the handler. The code below shows the handlers that need to be defined. A dummy do. nothing handler should be specified for all other entries of the two. This simple example clearly illustrates the problem. There is a lot of code repetition between. This creates a maintenance headache for state machine designers. We. will see in the following section that hierarchical state machine design. Conventional State Machine Implementation. Hierarchical State Machine Example. The following state transition diagram recasts the state machine by. Inservice and OutOfService are the high. Active and Standby states. Inservice state. Suspect and Failed are low. OutOfService state. The following diagram clearly illustrates the state hierarchy. Auto Xtc Crack. Even the. Inservice and OutOfService, high level states inherit from the UnitState that is. Hierarchical State Machine Source Code. The C implementation details of the hierarchical state machine are given. It is apparent that all the commonality has moved to the high level. Inservice and OutOfService. Also, contrast this with the. The code below contains hyperlinks to more detailed information about the. Header File. The header file below declares the Unit state machine using the HierarchicalStateMachine. Important points to note are The state classes are nested private classes within the state machine. Thus they are not visible to other classes. The state machine declares all states to be friend classes. This does not. break the encapsulation as only a private class is being declared as a friend. The base class UnitState. Thus an inheriting. State objects are declared static. Thus multiple instances of the state. Due to this, the HierarchicalStateMachine. Only the main message handler. OnMessage,  is declared public. All helper functions are private. A pointer to the current state is maintained in pCurrentState variable. This variable gets initialized using the. NextState method. HierarchicalStateMachine. Source File. Important things to note about the source file OnMessage, the main message handler invokes the appropriate handler based. The message is passed to the current state object. The OutOfService. Inservice. base states handle most of the message processing. In some cases, the. HierarchicalStateMachine.