By Luciano Lavagno, Grant Martin, Bran V. Selic
The complexity of so much real-time and embedded structures frequently exceeds that of alternative forms of platforms seeing that, as well as the standard spectrum of difficulties inherent in software program, they should take care of the complexities of the actual international. That world―as the proverbial Mr. Murphy tells us―is an unpredictable and sometimes unfriendly position. accordingly, there's a very robust motivation to enquire and observe complex layout equipment and applied sciences that can simplify and enhance the reliability of real-time software program layout and implementation. consequently, from the 1st models of UML issued within the mid 1990’s, designers of embedded and real-time platforms have taken to UML with vigor and exuberance. even though, the dream of an entire, model-driven layout movement from specification via computerized, optimised code iteration, has been tricky to grasp with out a few key advancements in UML semantics and syntax, particularly detailed to the real-time structures challenge. With the improvements in UML which have been proposed and are close to standardisation with UML 2. zero, a lot of those advancements were made. within the Spring of 2003, adoption of a formalised UML 2. zero specification by means of the participants of the thing administration staff (OMG) turns out very shut. it really is consequently very acceptable to check the prestige of UML as a suite of notations for embedded real-time platforms - either the cutting-edge and top practices accomplished as much as this time with UML of earlier generations - and the place the alterations embodied within the 2.
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Additional resources for Academic-Uml For Real Design Of Embedded Real-Time Systems
Consequently, the receiver object affects behavior by performing a sequence of actions which characterizes the operation behavior at a particular state. A call event is also linked to the operation that triggers the execution. As a call action, there exist two specific types of call events corresponding to the two specific call actions, CreateAction and DestroyAction. As with all events, a call event may have a list of parameters that matches those of the called operation. The UML specification does not define any formal rules of consistency between parameters of the received call event and the operation it Chapter 2 26 triggers.
The ModelElement whose behavior is described by AND-states executes them concurrently. Therefore concurrent states offer a means to express parallel execution. Figure 2-2 illustrates the use of a concurrent composite state in a state machine. In this case, the state owns both orthogonal regions, and If the transition is fired the model element owning this state-machine will be in the state AND in parallel. It is not the purpose of this section to describe in minute detail the semantics of state-machines.
In addition, UML defines two other stereotypes to specify the type of flow of control owned by an active class: « process » and « thread ». The first one specifies that the active object owns a resource which is of type “heavy-weight flow of control” and runs in its own address space that it doesn’t share with another active object. The second one specifies that the UML for Real-Time 21 active object may run with some other active objects in the same address space. It is a thread in the sense of POSIX [16, 17].
Academic-Uml For Real Design Of Embedded Real-Time Systems by Luciano Lavagno, Grant Martin, Bran V. Selic