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Object Oriented Analysis and Design
Notes Junction Pseudo-State: Junction pseudo-states are used to chain together multiple transitions. A
single junction can have one or more incoming, and one or more outgoing, transitions; a guard
can be applied to each transition. Junctions are semantic-free.
Did u know? A junction, which splits an incoming transition into multiple outgoing
transitions realizes a static conditional branch, as opposed to a choice pseudo-state which
realizes a dynamic conditional branch.
Example: Junction pseudo-states is shown in Figure 6.12.
Figure 6.12: Junction Pseudo-states
Source: http://www.ddegjust.ac.in/studymaterial/mca-5/mca-503.pdf
Terminate Pseudo-State: Entering a terminate pseudo-state indicates that the lifeline of the state
machine has ended. A terminate pseudo-state is denoted as a cross as shown in Figure 6.13.
Figure 6.13: Terminate Pseudo-state
Source: http://www.ddegjust.ac.in/studymaterial/mca-5/mca-503.pdf
History States: A history state is used to remember the previous state of a state machine when
it was interrupted.
Example: The diagram shown in Figure 6.14 illustrates the use of history states. The
example is a state machine belonging to a washing machine. In this state machine, when a
washing machine is running, it will progress from “Washing” through “Rinsing” to “Spinning”.
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