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Problem Set 1a: The State Machine Paradigm 6.005 Elements of Software Construction Fall 2009Problem Set 1a: The State Machine ParadigmDue: Monday, Sept 28, 2009 at 5:00pmThe purpose of this problem set is to give you practice in the basictechniques of the state machine paradigm. You'll construct statetransition diagrams for a variety of small problems. In the nextproblem set, you'll practice implementation patterns.State Diagram Modeling Simple modelsFor these models, we give you the designations of the events, so your task is just to construct a diagram. The focus is on learning the form and meaning of state machine diagrams.Alarm clock. Draw a state machine for an alarm clock with these input event classes:. set: the user sets a time for the alarm to go off.
arrive: the clock arrives at the time set for the alarm to ring. snooze: the user presses the snooze button.
Instead, you should use a proper modeling tool like YAKINDU Statechart Tools to draw the state diagram (statechart). Diagrams created with such a tool are easy to grasp. They improve communication between software developers and domain experts. Furthermore, unlike a diagram on a piece of paper or in a drawing application, modeling tools have a.
on: the user turns the alarm on. off: the user turns the alarm offand a single output event class:. ring: the alarm ringsEnergy saver.
Yesterday (Sunday Feb 20th) I intended on finishing up the second state diagram for my second assignment. I had the worst headache of my life (honestly) and couldn’t pull myself to do it. After work today I took a stab at it, and the following is what I came up with. I blogged about this before, but I wanted to show the “final” product.
Not too much changed from my first cut. I changed some of the names, filled in most of the triggers, and added some “do” activities. This one was difficult because of that middle part. There are so many triggers to take into account. In almost every state of playback you can jump to paused, rewind, fast forward, and play. This is a “simple” DVD player, I could have also included a menu button, a self transition on “Normal Speed Playback” to jump chapters, and I could have fleshed out the “DVD Menu” to account for special features and such. Things would have been rather hairy if I did. I suppose I could have created sub state diagrams to account for those, but I am not sure what the benefit would be. I just hope the professor is happy with this level of detail.
![Draw State Machine Models Of The Control Software For The Software For A Dvd Player Draw State Machine Models Of The Control Software For The Software For A Dvd Player](/uploads/1/2/7/6/127660767/444875709.png)
I have one more of these to go, and that is the state diagram for an answering machine. That one will be fun :). I should have this assignment finished up within the next few days, then I have to take my first exam :P. Snoqualmie screensaver serial killer. We’ll see how that goes.
P.S. UML experts out there please correct me on any bad notation!
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Tagged with: Assignment, DVD Player, Education, State Diagram, Statechart Diagram, UML, UML 2.0
Posted in Education, Software Engineering, Software Modeling, UML
Posted in Education, Software Engineering, Software Modeling, UML
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