Sequence Diagram

A Sequence diagram is an interaction diagram that shows how objects operate with one another and in what order. It shows object interactions arranged in time sequence. It depicts the objects and classes involved in the scenario and the sequence of messages exchanged between the objects needed to carry out the functionality of the scenario.

In a sequence diagram, parallel vertical lines are the lifelines, different processes or objects that live simultaneously. And the horizontal arrows are the messages exchanged between them, in the order in which they occur. This allows the specification of simple runtime scenarios in a graphical manner.

The Taxi App defines variuos sequence diagrams to put in the successful modules of this archituecture in one big picture. Some of these listed below:

  • Login
  • Socket Authentication
    • Socket Authentication
    • Socket Authentication Failure
  • Trip Request
    • Trip Request
    • Trip Request when no nearby Drivers found
  • Cancel Trip Request
    • Cancel Trip Request by Driver
    • Cancel Trip Request by Rider
  • Start Trip
  • Update Location
  • Update User Details

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