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System Integration course




                Creating an AppStore using Model
                  Driven Software Development
                                                          GS Team
                                  Dániel DARVAS, Gergő HORÁNYI,
                                     Balázs PÁL, Gábor SZÁRNYAS
                           Budapest University of Technology and Economics




Budapest University of Technology and Economics
Department of Measurement and Information Systems
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:
  o We must use jBPM5 business workflows.
  o Multiple platforms should be used for implementing
    web services.
 Creating a GUI is out of scope.
Tasks
1. 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 metamodel
Service component         Service method




                                  Data type




                                Entity
1. Design
 Components of our architecture:
  o AppRepository: stores the applications, application
    metadata, etc.
  o UserManager: stores the users
  o CreditManager: stores the credit accounts of the users
  o CodeVerifier: dummy component for code and
    metadata verification
1. Design
 Main entities (objects to store and handle)
  o Application: hollow for an application
  o ApplicationAccount: container object for storing
    applications bought by a specific user
  o 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 user
  o CreditTransaction: represents a credit transaction
    (income or expense)
  o User: represent a user or a developer
1. Design
 Main connections between entities
                              User

                        ApplicationAccount

                          CreditAccount



      Application                            CreditTransaction
  ApplicationMetadata

   ApplicationVersion
2. WS implementation
 Technology: Java EE and .NET
  o We 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 services
  o 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, CodeVerifier
  o Java EE: CreditManager, UserManager


 Persistence
  o 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 verification
  o 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 user
  o … made by developers liked by the user
  o … popular and rather expensive
  o … suitable for the user according to the applications’
    age limit
  o … 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
                                             Development    Platforms
                 REST interface                 tools

                             Workflow

Java EE / .NET
 Components
                                    Genius

            Business logic layer
                                             EMF-IncQuery

             Persistence layer
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/mdsd
  http://www.inf.mit.bme.hu/edu/courses/szolgint
 GSoaArchitect:
  http://code.google.com/p/gsoaarchitect/

 Team members
  o Dániel DARVAS    darvas.daniel
  o Gergő HORÁNYI    horanyi.gergo
  o Balázs PÁL       arnongoth
  o Gábor SZÁRNYAS   szarnyasg

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Creating an AppStore using Model Driven Software Development

  • 1. System Integration course Creating an AppStore using Model Driven Software Development GS Team Dániel DARVAS, Gergő HORÁNYI, Balázs PÁL, Gábor SZÁRNYAS Budapest University of Technology and Economics Budapest University of Technology and Economics Department of Measurement and Information Systems
  • 2. 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: o We must use jBPM5 business workflows. o Multiple platforms should be used for implementing web services.  Creating a GUI is out of scope.
  • 3. Tasks 1. 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
  • 4. 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/
  • 5. GSoaArchitect metamodel Service component Service method Data type Entity
  • 6. 1. Design  Components of our architecture: o AppRepository: stores the applications, application metadata, etc. o UserManager: stores the users o CreditManager: stores the credit accounts of the users o CodeVerifier: dummy component for code and metadata verification
  • 7. 1. Design  Main entities (objects to store and handle) o Application: hollow for an application o ApplicationAccount: container object for storing applications bought by a specific user o 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 user o CreditTransaction: represents a credit transaction (income or expense) o User: represent a user or a developer
  • 8. 1. Design  Main connections between entities User ApplicationAccount CreditAccount Application CreditTransaction ApplicationMetadata ApplicationVersion
  • 9. 2. WS implementation  Technology: Java EE and .NET o We 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 services o 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.
  • 10. 2. WS implementation  Platforms of the components o .NET: AppRepository, CodeVerifier o Java EE: CreditManager, UserManager  Persistence o Each component persists its own entities, e.g. • User is persisted by UserManager • Application, ApplicationMetadata, ApplicationVersion entities are persisted by AppRepository
  • 11. 3. Business workflows  Technology: jBPM5, Guvnor  Example workflows: o Application code or metadata verification o Application purchase
  • 12. 3. Business workflows  Verification of an application or its metadata (high level workflow)
  • 13. 3. Business workflows  Application purchase (high level workflow)
  • 14. 3. Business workflows  Application purchase (low level workflow – it can be executed) Service calls to implemented web services
  • 15. 4. Genius  Technology: JBoss Drools, jBPM  We implemented the Genius as a workflow o Output: some recommended applications
  • 16. 4. Genius  Suggestions are given by Drools rules  The recommended applications are … o … from category that is frequently chosen by the user o … made by developers liked by the user o … popular and rather expensive o … suitable for the user according to the applications’ age limit o … not bought already by the user
  • 17. 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.
  • 18. Architecture Development Platforms REST interface tools Workflow Java EE / .NET Components Genius Business logic layer EMF-IncQuery Persistence layer
  • 19. 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
  • 20. Links and contacts  Homepage of the courses: http://www.inf.mit.bme.hu/edu/courses/mdsd http://www.inf.mit.bme.hu/edu/courses/szolgint  GSoaArchitect: http://code.google.com/p/gsoaarchitect/  Team members o Dániel DARVAS darvas.daniel o Gergő HORÁNYI horanyi.gergo o Balázs PÁL arnongoth o Gábor SZÁRNYAS szarnyasg