Creation of Automaton Classes from Graphical Models and Automatic Solution for Inverse Problem Yuri A. Gubin student of SPb SU ITMO supervised by Anatoly A. Shalyto Ph. D, prof. CTD, SPb SU ITMO

Outline  Automata-based programming  Reverse engineering  DOT modeling language  Creation of automaton classes from graphical models  Library for creation of automaton classes  Description of the algorithm of automatic transfer from the executable code to isomorphic graphical model  How it works. Automaton for user registration.

Automata-based programming overview  Introduced by A. Shalyto in 1991;  Sort of synchronous programming;  Programs are treated as systems of automated controlled objects;  Each system consists of control system and controlled objects;  Control system - system of co-operating automata.

Automata-based programming benefits  Formally describes application logic and behaviour;  Perfect solution for reliable application development for reactive and embedded systems;  Defines two types of diagrams for application description – connectivity schema and transition graphs;  Partition usage

Outline  Automata-based programming  Reverse engineering  DOT modeling language  Creation of automaton classes from graphical models  Library for creation of automaton classes  Description of the algorithm of automatic transfer of the executable code to isomorphic graphical model  How it works. Automaton for user registration.

Reverse engineering  Repair lost documentation.  Product analysis.  Security auditing.  Academic/learning purposes.  Curiosity.  Competitive technical intelligence.  Learning: Learn from others mistakes Aspects of usage: Graphical model is an important part of reverse engineering process

Outline  Automata-based programming  Reverse engineering  DOT modeling language  Creation of automaton classes from graphical models  Library for creation of automaton classes  Description of the algorithm of automatic transfer of the executable code to isomorphic graphical model  How it works. Automaton for user registration.

Graphviz  Graphviz is a package of open source tools initiated by AT&T Research Labs for drawing graphs specified in DOT language scripts.  Graphviz is free software licensed under the Common Public License.  Graphviz consists of a graph description language named the DOT language and a set of tools

DOT & dot  Modeling language  Directed/undirected graphs  Attributes  Tool  Cross platform  SVG, PNG, GIF, JPG digraph graphname { a -> b -> c; b -> d; }

More about DOT  Behavior diagram.  Graphs.  Describe logic.  Concurrent processes  Entire structure  Reverse engineering of automata-based programs

Outline  Automata-based programming  Reverse engineering  DOT modeling language  Creation of automata-based programs from graphical models  Library for creation of automaton classes  Description of the algorithm of automatic transfer of the executable code to isomorphic graphical model  How it works. Automaton for user registration.

We can:  Use visual tools (Real, UniMod).  Use DSL (in Ruby, Groovy, others).  Use automaton libraries (Java, C#). Creation of automata-based programs

Outline  Automata-based programming  Reverse engineering  DOT modeling language  Creation of automaton classes from graphical models  Library for creation of automaton classes  Description of the algorithm of automatic transfer of the executable code to isomorphic graphical model  How it works. Automaton for user registration.

Overview Classes:  Automaton components: State, Transition, StateGroup, DSL.  Other classes: Entity, DOTConverter*. Interfaces:  Guard  Action

Sample package demo; import automaton.*; public class PureStates extends DSL { public State a = new State("a"); public State b = new State("b"); public Transition t1 = new Transition("t1", "Event", new Guard() { public boolean is() { System.out.println("Stub guard"); return true;} public String toDOT() { return "Stub guard";} }, null,a, b); public Transition t2 = new Transition( "t2", "Event2",null, null, b, a); }

Usage and Benefits import automaton.*; import demo.*; public class Main { public static void main(String[] args) { PureStates pureStates= new PureStates() ; DSL.compile(pureStates, pureStates.a); pureStates.saveToFile(“pure_states.dat"); pureStates.printImageToFile(“pure_states.gif"); pureStates.process("Event"); … Benefits:  Anonymous classes  Inheritance of automaton classes  Syntactic attractiveness  Designed for isomorphic transformation to model

Outline  Automata-based programming  Reverse engineering  DOT modeling language  Creation of automaton classes from graphical models  Library for creation of automaton classes  Description of the algorithm of automatic transfer of the executable code to isomorphic graphical model  How it works. Automaton for user registration.

Overview Problems  Duplicated nodes  Transitions between states and groups  Transitions between groups  Nested groups, states Input data:  Meta information  Properties of automaton class and components  Description of each component in DOT

Step by step states that don’t belongs to any group groups and nested states transitions  Objects are self-described  Object transforms itself to simple DOT

Output digraph veryuniqname { compound=true; subgraph cluster0{ "c"[ label = "c"] "axstart"[shape=point] "axstart" -> "a" "a"[ label = "a"] "b"[ label = "b"] "b"->"c"[label = " E "] "c"->"a"[label = " E "] "a"->"b"[label = " E(G)/ACT "] "b"->"a"[label = " E "] label=" StatesInheritance : demo.PureStates "} } saveToFile() – save as plain text printImageToFile() – save as Image

Outline  Automata-based programming  Reverse engineering  DOT modeling language  Creation of automaton classes from graphical models  Library for creation of automaton classes  Description of the algorithm of automatic transfer of the executable code to isomorphic graphical model  How it works. Automaton for user registration.

BasicUser model

AdvancedUser model

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