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. ShalytoPh. D, prof. CTD, SPb SU ITMO

Outline

Automata-based programmingReverse engineeringDOT modeling languageCreation of automaton classes from graphical models Library for creation of automaton classesDescription of the algorithm of automatic transfer from the executable code to isomorphic graphical modelHow 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 programmingReverse engineeringDOT modeling languageCreation of automaton classes from graphical models Library for creation of automaton classesDescription of the algorithm of automatic transfer of the executable code to isomorphic graphical modelHow 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 programmingReverse engineeringDOT modeling languageCreation of automaton classes from graphical models Library for creation of automaton classesDescription of the algorithm of automatic transfer of the executable code to isomorphic graphical modelHow 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 languageDirected/undirected graphsAttributes

ToolCross platformSVG, PNG, GIF, JPG

digraph graphname { a -> b -> c; b -> d; }

More about DOT

Behavior diagram. Graphs. Describe logic.Concurrent processesEntire structure

Reverse engineering of automata-based programs

Outline

Automata-based programmingReverse engineeringDOT modeling languageCreation of automata-based programs from graphical models Library for creation of automaton classesDescription of the algorithm of automatic transfer of the executable code to isomorphic graphical modelHow 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 programmingReverse engineeringDOT modeling languageCreation of automaton classes from graphical models Library for creation of automaton classesDescription of the algorithm of automatic transfer of the executable code to isomorphic graphical modelHow it works. Automaton for user registration.

Overview

Classes:Automaton components: State, Transition, StateGroup, DSL.Other classes: Entity, DOTConverter*.

Interfaces:GuardAction

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 classesInheritance of automaton classesSyntactic attractivenessDesigned for isomorphic transformation to model

Outline

Automata-based programmingReverse engineeringDOT modeling languageCreation of automaton classes from graphical models Library for creation of automaton classesDescription of the algorithm of automatic transfer of the executable code to isomorphic graphical modelHow it works. Automaton for user registration.

Overview

ProblemsDuplicated nodesTransitions between states and groupsTransitions between groupsNested groups, states

Input data:Meta informationProperties of automaton class and componentsDescription of each component in DOT

Step by step

states that don’t belongs to any group

groups and nested states

transitions

Objects are self-describedObject 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 programmingReverse engineeringDOT modeling languageCreation of automaton classes from graphical models Library for creation of automaton classesDescription of the algorithm of automatic transfer of the executable code to isomorphic graphical modelHow it works. Automaton for user registration.

BasicUser model

AdvancedUser model

Thank you!