What are advance dynamic modeling concept?

There are four advanced dynamic modeling concepts: Entry and exit actions are features of advanced dynamic moDELLing. Actions can be associated with entering an exiting a state as an alternative to connecting them to transactions. An entry action is performed when any transition enters the state and an exit action is performed when a state is exited. This allows a state to be expressed in terms of matched entry and exit actions without regard to what happens before a state becomes active.

An internal action does not change the state it executes within the state.

Automatic transactions fire and change the state when their conditions are met and any activity in the current state is terminated.

Sending Events:An object can send an event to another object together with an attribute. A race condition occurs when a state may accept events from more then one object. In this case the order of the events becomes important since it might affect the final state of the object.

Synchronization of concurrent activities:Sometime the object may perform two or more activities at a time concurrently.The internal steps may not be synchronized,but both the activities must be completed before the object can progress to next state. Any transition into a state with sub diagrams activates each of the diagram.

From: Object-Oriented MoDELLing and Design, J Rumbaugh, M Blaha, W Premerlani, F Eddy, W Lorensen, 1991, Page 27-31