1. OMGi Application Store
A service oriented application developed
in a model driven approach

2. Introduction
● The project was created during a service-
oriented development course at BUTE-FTSRG.
● Related open source project: OMGi Tools, an
envirionment for model base development of
service oriented applications
● Participiants:
● Bogsch Balázs (balaggee gmail.com)
● Papp István (pappist87 gmail.com)
● Tóth Tamás (tothtamas.bme gmail.com)
● Tóth Zsolt (toth.zsolt.bme gmail.com)

3. Project scope
● Developing a service-oriented application store
● Features:
○ Services for managing accounts, apps,
purchases, etc.
○ Business process based quality management
○ Business process based application purchase
○ Rule based application filter

4. Phases of development
● The project was created in a model
driven manner.
● Main development phases:
1. Analysis and design
● Requirement analysis
● Architectural design
● Business process modeling
2. Generative implementation of
business logic
3. Enhancement with rule based
functionality

5. Model based developement process
Requirement analysis &
Use case Architectural
business process
model design
modeling
Business Generative Domain specific
process model implementation language & model
Enhancement
with rule based
functionality

6. Requirement analysis
● UML based analysis
● Modeling functional requirements with use
cases
● Modeling scenarios with activities
● Main functionality
● Account management for customers and
developers
● Management of applications and versions
for developers
● Transactions
● Automatic and manual quality
management of uploaded apps

7. Example: Customer use cases

8. Architectural design
● Creation of an EMF-based domain specific
language that describes:
● Business data
● Business components and services
● Interconnections and dependency between
them
● and other aspects
● System architecture specification in the
created language

9. Domain specific language
general
data type
attribute of
an entity
service
parameter
entity
business
service
technological
REST details
service
business
component
reference between
entities

10. System architecture
Implementation of the services, which provide
the specified functionalities
Quality manager
Customer services Developer services
services
REST Service layer
Business layer
Database layer
Database

11. Domain specific architecture model
Business
component
REST
REST Business
interface
service service

12. Business process modeling
● Modeling in BPMN
● Specified processes:
● Quality management
● Application purchase (example)

13. Implementation: code generation
● Technology: Xtend
● Input: the specified system model
● Generates the following from the system
model:
● Annotated JPA entity classes
● Annotated REST interfaces of business services
● Stubs for business logic with dependencies
● The generated code is runnable on OSGi
platform
● For more: check OMGi Tools

14. Code generation example:
Annotated JPA entities
@Entity
//...
public class Customer extends User {
//...
@ManyToMany
private List<App> purchasedApps = new ArrayList<App>();
public List<App> getPurchasedApps() {
return purchasedApps;
}
public void setPurchasedApps(List<App> purchasedApps) {
this.purchasedApps = purchasedApps;
}
//...

15. Code generation example:
Annotated REST services
@Path("/rscustomermanager")
public class RsCustomerManager i mplements IRsCustomerManager {
private CustomerManager customerManager = new CustomerManager();
//...
@DELETE
@Path("removecustomer/{customerId}")
@Produces("text/plain")
@Override
public Response removeCustomer(@PathParam("customerId") String
customerId)
throws NumberFormatException, DatabaseAccessException,
NoSuchEntitytException {
System.out.println("INFO: RemoveCustomer service called....");
return Response.status(200).entity("Service called succesfully");
}
//...

16. Code generation example:
Business logic stubs
public class CustomerManager implements ICustomerManager {
private IUserAccountManager userAccountManager = new
UserAccountManager();
//...
@Override
public void removeCustomer( int customerId) throws
DatabaseAccessException,
NoSuchEntitytException {
//ToDo
return;
}
//...

17. Implementation: business processes
● Implementation of services, which are called from
business processes
● Call REST services from WorkItem handlers
Application purchase REST services
REST Service layer
Business layer

18. Enhancement with rule based
functionality
● Add „Genius” feature to the system
● Intelligent, rule based application
recommendation
● Considering user habits and business
interests
● Preferred expensive and frequently purchased
applications
● Preferred the works of developers from whom the
user purchased a lot
● Preferred applications purchesed by user who has
similar purchasing habits
● Preferred applications from category which is
popular for user

19. Enhancement with rule based
functionality – implementation - 1
● Enlargement the system model and generate
new components and services
● Implement „Genius” REST service
● Request parameter customer ID and the response a list
of recommend applications
● Implement necessary business services in
business logic layer
● Use JBoss Drools rule engine
● Weighting applications when a rule is activated

20. Enhancement with rule based
functionality – implementation - 2
Request
Collect
Collect possible applications
data
(e.g. not purchased)
Genius REST Service
Fire rules Business layer
Response
Get applicaions’ metrics:
● app popularity
● generated income
● developer popularity
● user similarity

21. Used technolgies
Business processes: jBPM Business rules: JBoss Drools
REST service layer: Jersey
Business layer: OSGi, JEE, .Net WPF
Database access layer: EclipseLink
Database: Derby

22. Links
● BUTE Fault Tolerant Systems Research Group
http://www.inf.mit.bme.hu/en
● SOA course at BUTE
http://www.inf.mit.bme.hu/edu/courses/szolgint
● OMGi Tools
http://code.google.com/p/omgi-tools/