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Statechart Notation A statechart is simply a network of states and events. When entering a state that has a nested statechart, you may want to resume where you left off when you left the enclosing state. Each statechart is a simple pair of states. faculty.juniata.edu /rhodes/smui/statechart.htm   (788 words)

UML Statecharts   (Site not responding. Last check: 2007-11-07) Statecharts are used when the transition from state to state takes place primarily when an event of interest occurs. Statecharts are a powerful visual formalism for capturing complex behavior, and apply well to both functionally decomposed systems and to object-oriented ones. Statecharts add a number of useful extensions to the traditional flat Mealy-Moore state diagrams, such as nesting of states, conditional event responses via guards, orthogonal regions, and history. www.embedded.com /1999/9901/9901feat1.htm   (6501 words)

JOT: Journal of Object Technology - State Machines as Mixins, Ashley McNeile and Nicholas Simons But a statechart is a single entity, and there is no obvious simple way of merging multiple statecharts, or of extending or refining all or part of a single statechart. As noted by all of these sources, the implication of applying the LSP to behaviour (as specified by a statechart) is that any sequence (trace) of event driven transitions that a parent handles, its child must handle too – otherwise the child could not successfully substitute for the parent. In the case of multiple inheritance, the statechart of the child is the orthogonal composition of the statecharts of its parents. www.jot.fm /issues/issue_2003_11/article2   (6053 words)

Statechart diagrams Statechart diagrams enable you to model UML state machines. Statechart diagrams emphasize the possible states of an object and the transitions between states. A Transition may have multiple sources, meaning it is a join from several concurrent states, or it may have multiple targets, meaning it is a fork to several concurrent States. osiris.sunderland.ac.uk /Together/Users-Guide/State_diagrams.htm   (936 words)

DCE 1.1: Remote Procedure Call - Connectionless RPC Protocol Machines Statechart internal flag: received frag at server and last sent frag are not equal. Statechart internal flag: header flag lastfrag for PDU to be sent. Statechart internal flag: received fragment number at client and last sent fragment number are not equal. www.opengroup.org /onlinepubs/9629399/chap10.htm   (5030 words)

statdiag.html The state/activity model icon that appears in the browser can be thought of as a "container" for statechart and activity diagrams and all of their model elements. Statechart diagrams are closely related to activity diagrams. A statechart diagram is typically used to model the discrete stages of an object's lifetime, whereas an activity diagram is better suited to model the sequence of activities in a process. www.cs.utsa.edu /~kdo/roseTutorial/statdiag.html   (3327 words)

Statechart Notation Problematic : Editorial : uidesign.net   (Site not responding. Last check: 2007-11-07) In his book, Constucting the User Interface with Statecharts, reviewed in March, Ian Horrocks was careful to point out that he had adopted David Harel's Statechart notation and made no attempt to update or modify it. The problem with this is that inheritance in the Statechart is shown using a containment in a similar fashion to Types and sub-types in an ERD. To show the relationship of a state in the Statechart to an entity on a Navigation Diagram, to a Class in the Presentation Layer Class Diagram, to the messaging in a Sequence Diagram and so on. www.uidesign.net /1999/imho/nov_imho.html   (1174 words)

Coding the Statechart A separate state variable is necessary for each concurrent statechart. If you have a flat statechart, i.e., one that is similar to a finite state machine, you would only need one variable to track the state. The translation of a statechart to code is straight forward and algorithmic. faculty.juniata.edu /rhodes/smui/sccoding.htm   (545 words)

Statecharts CSP and statecharts do provide similar functionality in many areas; this is to be expected due to their predominant use in developing real time systems. Contrasting CSP and statecharts on a paradigmatic approach statecharts are concerned primarily with clearly and succinctly express complex logic relationships between states. These two representations each have different advantages and disadvantages, a statechart may be more comprehensible to many people, a CSP description may be easier to include as a comment in source code thereby enabling the programmer easy access to the specification to which he is writing in an easy and unambiguous manner. www.benmeadowcroft.com /reports/statechart   (1509 words)

Statechart assertions - Wikipedia, the free encyclopedia Statechart assertions are a formal specification interpretation of Harel statecharts developed by Doron Drusinsky. A statechart assertion is used for runtime verification and automatic test generation of some other, design or model, statechart (the "primary" statechart). Statechart assertions are often used for non-testing purposes, such as run-time recovery from specification violations. en.wikipedia.org /wiki/Statechart_assertions   (270 words)

Technology Accelerator: Statechart-to-C++ Mapping   (Site not responding. Last check: 2007-11-07) Reactive systems are best modeled with statechart diagrams, as the main focus of these diagrams is on the possible events that the system can respond to and how the response is carried out. With statechart diagrams, you can visualize the behavior that the system will exhibit—according to its current state—in response to a particular event. To illustrate the mapping from statechart diagrams to ANSI C++ code, this Technology Accelerator features a temperature control system that is reactive to two types of external events: user commands (from a control panel, for example) and changes in the ambient temperature. www.codagen.com /accelerators/statechart_to_cpp.htm   (332 words)

2 Using the Statemate MAGNUM toolset, statecharts can be executed, and provide a means of rapid prototyping [Harel and Politi, 1998]. Using statecharts, the description of a system can be created in a modular fashion using information hiding. The visual formalism provided by statecharts aids understanding and facilitates clean, simple descriptions of hierarchies in the operational structure of a system. www.ee.umanitoba.ca /~cilab/SEA/TheWebBook/wb6/wb6.htm   (614 words)

Lab 2 - Statechart Diagrams Construct a statechart diagram, connected to the class, that describes the behaviour of the lock and phone. Create a statechart diagram for a class Right-click the class in the model browser (the left window containing the tree structure of the model), and chose "new > Statechart Diagram". Some examples of statechart diagrams can be found here. www.idt.mdh.se /kurser/cd5360/02/labs/homework4.html   (691 words)

Orangepath: Direct Synthesis of Asynchronous Logic from Statecharts via Fundamental Mode Untimed Automata. (Note: Statecharts in the user's source code are internally converted to assertions for scheduling and it is the output from this schedule that is the statechart psudocode mentioned here.) These statecharts can be readily converted to software or synchronous hardware, but generating gate-level asynchronous hardware is a more complex problem. On the other hand, in a statechart, control has no implied flow: it sits at the current state with all commands at that point being active, with the conditional ones being ready to fire when circumstances match their condition. During elaboration, the conditional branches end up with a contrary appearance: the implied flow of control from one point to the next requires an explicit elab whereas a goto to the current point is the default action and does not require an elab. www.cl.cam.ac.uk /users/djg/wwwhpr/dsasynch.html   (4069 words)

DCE 1.1: Remote Procedure Call - Connection-oriented RPC Protocol Machines Statechart internal pointer to data to be sent in next request PDU. Statechart internal flag: header flag PFC_LAST_FRAG for PDU to be sent. Statechart internal pointer to data to be sent in next response PDU. www.opengroup.org /onlinepubs/9629399/chap11.htm   (5408 words)

Quality Driven Web Services Composition The choice of statecharts for specifying composite Web services is motivated by two main reasons: (i) statecharts have a well-defined semantics; and (ii) they offer the basic flow constructs found in contemporary process modeling languages (i.e., sequence, conditional branching, structured loops, concurrent threads, and inter-thread synchronization). The initial state of a statechart is denoted by a filled circle, while the final state is denoted by two concentric circles: one filled and the other unfilled. Under the assumption that the underlying statechart is acyclic, it is possible to represent an execution path of this statechart as a Directed Acyclic Graph (DAG) as follows. www2003.org /cdrom/papers/refereed/p358/htm/p358-zeng.html   (6622 words)

Working with statechart diagrams   (Site not responding. Last check: 2007-11-07) A statechart diagram shows the possible states of the object and the transitions that cause a change in state. You can essentially draw another statechart diagram inside it, complete with start/end/history states and transitions of all kinds to create a substate diagram. This opens the Add Shortcut dialog, in which you navigate to the existing statechart diagram and select elements, states, histories, and/or fork/joins. info.borland.com /techpubs/studio_java/studio_java1/tg_help/modeling/wwstatediagrams.html   (808 words)

argouml: ArgoUML Tours - Building a Statechart Diagram Every statechart diagram is associated with exacltly one class. In this case, the statechart diagram above is associated with the Grad class from the class diagram of Enroll.argo. This does not have to be done to create the statechart diagram, but it helps keep the tutorial clear. argouml.tigris.org /tours/bdStateDiagram.html   (260 words)

CS484 StateChart Project   (Site not responding. Last check: 2007-11-07) Use Statecharts to design your own interface controller for a nontrivial interface. Implement a statechart visualizer application - design and implement an application that visualizes how a system works by interactively showing how it changes states. States are shown as statecharts and the interface also allows the user to send events which cause state transitions. www.cs.siu.edu /~wainer/484F99/statechartProj.html   (182 words)

UML Notation Guide - Statechart diagram   (Site not responding. Last check: 2007-11-07) A statechart diagram shows the sequences of states that an object or an interaction goes through during its life in response to received stimuli, together with its responses and actions. Statechart notation also implements aspects of both Moore machines and Mealy machines, traditional state machine models. A state machine is a graph of states and transitions that describes the response of an object of a given class to the receipt of outside stimuli. etna.int-evry.fr /COURS/UML/notation/notation9a.html   (2708 words)

Statechart Diagram Construction   (Site not responding. Last check: 2007-11-07) To edit the statemachine, a statechart diagram can be attached to it. This creates a new statechart diagram representing the statemachine, from which you can add appropriate states and transitions. States and transitions created from the diagram are automatically reflected in the model browser as sub-components of the statemachine, following the same hierarchical structure. www.irisa.fr /UMLAUT/UserManual/stateCharts.html   (187 words)

Dr. Dobb's | Supporting Orthogonal Regions In Practical Large-scale Projects | November 30, 2006 To understand how to avoid the common pitfalls in statechart designs, let's first review the basic components in Quantum Framework (QF) and the extension that can better support orthogonal regions. Statecharts are used to highlight key points only and are not complete designs. Thanks to the hierarchical nature of statecharts, we can reply a default response (usually an error status) in the parent state and override it only in states that actually handle the request. www.ddj.com /dept/cpp/196601103   (2309 words)

Tutorial6   (Site not responding. Last check: 2007-11-07) If at any stage while the telephone is not idle the handset is placed back on the hook the phone will get into the idle state again regardless of the exact state it was when the handset was placed on the hook. Select a class from the browser whose behaviour is to be formally specified using the statechart diagram. A new statechart diagram associated with this class will appear in the diagram window (if a statechart diagram has already been created for this class this diagram will appear in the diagram window). www.soi.city.ac.uk /~gespan/s918/Tutorial6.html   (469 words)

Noriaki Project Depth is depicted in the figure by nesting states A and C together in D. As the figure depicts the fl dot shows where within an accumulation of states the initial state resides. Beginning with system activation, the scheduling aspects of the system are entered and revolve around communications and sharing of messages between four main state groupings the local office/manager, both the full-time and part-time collector, and the monitor. By using the statechart tool these types of groupings are possible utilizing the depth of the visual formalism. www.isr.umd.edu /~austin/ense621.d/projects04.d/project-noriaki.html   (2949 words)

Introduction A statechart diagram has an initial state and a final state and in between this, there will be a series of transitions between different states representing the view of behavior modeling. The tool kit has a tool bar which features all the elements that can be used to make a statechart diagram. The statechart represents the various levels of water storage for a hydro-electric dam. www.isr.umd.edu /~austin/toolkit_site/statechart.html   (478 words)

Computer Science 223: Discussion Questions What is the purpose of a statechart and what advantages does it hold over other kind of charts that we use? Can there be a special case in statechart diagram where the final state is reached and the object not destroy? Statecharts diagram the behavior of a class in response to external stimuli. www.math.grin.edu /~walker/courses/223.sp02/read-alhir-4c.html   (611 words)

State diagram - Wikipedia, the free encyclopedia Harel statecharts (developed in 1987 by David Harel) are gaining some more widespread usage since a variant has become part of UML. With Harel statecharts it is possible to model "and" machines, where a machine is in two or more states at the same time. SCXML an XML language that provides a generic state-machine based execution environment based on Harel statecharts. en.wikipedia.org /wiki/State_diagram   (916 words)

Modelling Web Navigation by Statechart (ResearchIndex)   (Site not responding. Last check: 2007-11-07) Currently available web navigation modeling tools are unable to cope with the need of modeling these contemporary web sites, especially those with dynamic content. This need is analyzed in this paper and a web navigation model based on statechart is proposed to meet the requirements. 118 the formal semantics of statecharts (context) - Harel, Pnueli et al. citeseer.ist.psu.edu /291119.html   (388 words)

Statechart Methodology for the Design, Validation, and Synthesis of Large Scale Asynchronous Systems - Kol, Ginosar, ...   (Site not responding. Last check: 2007-11-07) Statechart Methodology for the Design, Validation, and Synthesis of Large Scale Asynchronous Systems (1996) One alternative CL statechart is shown in Fig. Kol, R. Ginosar and G. Samuel, "Statechart methodology for the design, validation and synthesis of large scale asynchronous systems," in 2nd Int Symp. citeseer.ist.psu.edu /kol96statechart.html   (434 words)

UML Notation Guide - Statechart diagram - continued   (Site not responding. Last check: 2007-11-07) A send arrow to an object maps into a SendAction whose message is a Signal that corresponds to the name on the arrow and whose target ObjectSetExpression corresponds to the target object. In addition, the transition in the target statechart implicitly triggers on the event being sent (i.e., the name of the sent event is effectively written on the target transition). If the sender symbol is an object, then the diagram is suggestive of the sender but has no actual semantic mapping. etna.int-evry.fr /COURS/UML/notation/notation9b.html   (1532 words)

The Boost Statechart Library - Overview (via CobWeb/3.1 planetlab2.cs.unc.edu)   (Site not responding. Last check: 2007-11-07) Straightforward transformation from UML statechart to executable C++ code and vice versa. In order to use this library, the statechart directories need to be copied to their respective locations in the tree of the boost distribution 1.33.0. Throughout all Boost.Statechart documentation it is assumed that the reader is familiar with the state machine concept, UML statecharts and most of the UML state machine terminology. boost-sandbox.sourceforge.net.cob-web.org:8888 /libs/statechart/doc/index.html   (2375 words)

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