Serial Wait State Pattern

Realtime software sometimes involves handling serial interactions with multiple entities. A request is sent to an entity to initiate an operation, its response is awaited and then on receipt of response, another request is sent to the next entity and this sequence continues until response has been received from the last entity in the sequence. Further action can be initiated only after response message has been received from the last entity.

Serial Wait state pattern handles such scenarios. Serial Wait state pattern is simpler to implement than Parallel Wait state pattern. Also, it is easier to isolate faults and initiate corrective action in Serial Wait state pattern since at any given time, request response handshake is being performed only with one entity.

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