Offshore Development Center for a US Customer
The client
The customer is a professional information technology products and
services provider, which products ranged of rental, booking, etc.
What the client wanted
The project was performed to accomplish all businesses activities
regarding property rental. The customer wanted Abstract Technology to
serve as its offshore development center to complete the development
of its system.
According to the customer's requirement:
- The project should be able to accomplish most parts of the
whole system, which were also the basic parts. It is important
to the framework design, database design and UI design.
- The project was designed to realize user management, user
group management, and basic configuration management, common
business activities in the system and some other activities
directly related to property rental.
Approach
Our development process was strictly based on the RUP. According
to our rich experience and better understanding of the requirement,
we adopted a 3-layer model to complete the development:
- The presentation layer was implemented by using .NET Windows Form
and programs are deployable through HTTP. The programs were divided
into multiple components based on functions to ensure that components
included functions properly and were manageable. It was also convenient
for further enhancement.
- The business logic layer was realized by using Web Service and
BPEL. Business Process Execution Language for Web Services (BPEL4WS)
provides an XML-based process definition and execution language
that enables the description of rich business processes capable
of consuming and providing Web services in a reliable and dependable
manner. Web Service implemented actual operations as control class.
During the process, Data Access component would be called to do
the job when there was a request to database. At last, the control
class built the entity class and returned to the caller. Entity
class was mainly used for carrying data, and does not perform any
other operations. All work were done by control class
- The data layer was realized by using DAO (Data Access Objects).
As the system was required to be run on multiple database platforms,
all database operations of the system were accomplished in one component
to reduce the cost of database migration. When an access request
arrived, the component would receive a SQL command from the XML
configuration file, and then access SQL Server by using SqlConnection
of ADO.NET, or access Oracle by using OracleConnection.
