A simple state can have two or more compartments.If a state doesn’t have any substates, transitions, regions, submachines, then it’s a simple state. Simple states are denoted by a rectangle with rounded corners. It represents a single, atomic state that the state machine can be in at any given time. But composite state makes your state machine diagram much simpler, you can reduce the clutter in the state machine diagram using composite state, but we will keep that for a separate discussion.Īnd whenever I explain various transitions and other things while doing this exercise, all those terminologies are with respect to the simple state.Ī simple state is a basic state that has no substructure or internal behavior. Give a name that is unique within the state machine diagramįor this exercise, we will use a simple state.And an application may have different objects, and there could be a separate state machine model for each object. What I want to clarify here is that, number states belong to the life cycle of an object. An object also comprises a set of behaviors or methods, or you can call it member functions and those functions act upon those attributes. Attributes are nothing but structure or class member elements.įor example, there could be a few structure or class attributes in our application to track the current time, elapsed time, productive time, etc. That’s why states are associated with the life cycle of an object.Īnd an object is nothing but it’s a collection of a set of attributes and a set of behaviors. Our application also definitely will have one associated object. All these scenarios you can map into different states in a state machine diagram.Īn application may have different objects. These are the different scenarios through which the Protimer application object lifecycle passes. Map different scenarios through which an object lifecycle passes into a number of states.ĭifferent scenarios of Protimer application: In most cases, this condition is not explicitly defined but is implied, usually through the name associated with the State (OMG® UML 2.5.1) Basically, it’s a terminology used in OOP, object-oriented programming.Ī State models a situation in the execution of a StateMachine Behavior during which some invariant condition holds. In a programming language, there is no concept of classes, you can think of it as an instance of a structure. Here, object is nothing but an instance of a class or an instance of a structure. The state represents a distinct stage of an object’s lifecycle.
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