Budapest University of Technology and EconomicsDepartment of Measurement and Information Systems

Creating an AppStore using Model Driven Software Development

GS Team

Dániel DARVAS, Gergő HORÁNYI,Balázs PÁL, Gábor SZÁRNYAS

Budapest University of Technology and Economics

System Integration course

Object of the work Creating a prototype of an application store’s web

services where:o applications can be published, bought or verified;o users can be registered;o payments can be transferred

Additional requirements:oWe must use jBPM5 business workflows.oMultiple platforms should be used for implementing

web services. Creating a GUI is out of scope.

Tasks1. Designing a data model for AppStore

2. Implementing the web services

3. Creating business workflows

4. Uploading test data

5. Creating an intelligent, rule-based advisor (called Genius) to recommend applications for users

1. Design Technology: Eclipse Modeling Framework

We made a general Service Oriented Architecture metamodel on the „Model Driven Software Development” course named GSoaArchitect.o http://code.google.com/p/gsoaarchitect/

GSoaArchitect metamodelService component Service method

Data type

Entity

1. Design Components of our architecture:

o AppRepository: stores the applications, application metadata, etc.

o UserManager: stores the userso CreditManager: stores the credit accounts of the userso CodeVerifier: dummy component for code and

metadata verification

1. Design Main entities (objects to store and handle)

o Application: hollow for an applicationo ApplicationAccount: container object for storing

applications bought by a specific usero ApplicationMetadata: metadata for an application

(name, price, etc.)o ApplicationVersion: represents a specific version of an

application (stores its files)o CreditAccount: credit account of a usero CreditTransaction: represents a credit transaction

(income or expense)o User: represent a user or a developer

Main connections between entities

1. Design

Application

ApplicationMetadata

ApplicationVersion

User

ApplicationAccount

CreditAccount

CreditTransaction

2. WS implementation Technology: Java EE and .NET

oWe had to use multiple platforms. With our GSoaArchitect tool we are able to

generate automatically (using Xpand) the following parts for both platforms:o Skeletons of web serviceso Entities and persistence (using Entity Framework or

Java Persistence API)o Project files (e.g. .csproj descriptors)

Note that the target platform of the components and entities are specified by the source model.

2. WS implementation Platforms of the components

o .NET: AppRepository, CodeVerifiero Java EE: CreditManager, UserManager

Persistenceo Each component persists its own entities, e.g.• User is persisted by UserManager• Application, ApplicationMetadata, ApplicationVersion

entities are persisted by AppRepository

3. Business workflows Technology: jBPM5, Guvnor

Example workflows:o Application code or metadata verificationo Application purchase

3. Business workflows Verification of an application or its metadata

(high level workflow)

3. Business workflows Application purchase

(high level workflow)

3. Business workflows Application purchase

(low level workflow – it can be executed)

Service calls to implemented web services

4. Genius Technology: JBoss Drools, jBPM

We implemented the Genius as a workflow

o Output: some recommended applications

4. Genius Suggestions are given by Drools rules

The recommended applications are …o… from category that is frequently chosen by the usero… made by developers liked by the usero… popular and rather expensiveo… suitable for the user according to the applications’

age limito… not bought already by the user

5. Uploading test data Technology: Eclipse Modeling Framework

We created an importer which can explore an EMF instance model and uploads the found data over our components’ REST web services.

Architecture

Genius

PlatformsDevelopment tools

Persistence layer

Business logic layer

REST interface

Workflow

EMF-IncQuery

Java EE / .NETComponents

Used technologies Eclipse, Visual Studio: for development Eclipse Modeling Framework: for creating the

model of the architecture jBPM5, Guvnor: for workflows .NET, JavaEE: for implementing web services Entity Framework, JPA: for persisting entities Drools: for giving rule-based suggestions Eclipse OCL, EMF-IncQuery: for validation models

Links and contacts Homepage of the courses:

http://www.inf.mit.bme.hu/edu/courses/mdsdhttp://www.inf.mit.bme.hu/edu/courses/szolgint

GSoaArchitect:http://code.google.com/p/gsoaarchitect/

Team memberso Dániel DARVAS darvas.danielo Gergő HORÁNYI horanyi.gergoo Balázs PÁL arnongotho Gábor SZÁRNYAS szarnyasg