子計畫三：高可擴充性與可用性行動電子商務中介軟體技術 之研發與實作(3/3)

As the use of the Internet and mobile communications becomes popular, the combination of
these two technologies has brought many novel applications into the real world. The so-called
mobile e-commerce is one of them. The main goal of this project is to investigate how to provide
fault-tolerance for the whole platform and to improve system scalability. With the integration of
other projects, a new wireless Internet business system could be realized.
However, it is not easy to convert a legacy client-server style system into Internet-compliance.
The Internet clients can be worldwide. The system must have high availability to provide
continuous services. Furthermore, the rapid development of new technology makes the life cycle
of one system even shorter. As a result, it's important to put scalability and maintainability into
consideration when constructing the system architecture. In this project, we make use of the
distributed object technology to design and implement the multi-tier system architecture. By
building different function levels in the multi-tier fashion, high system scalability can be achieved.
Furthermore, because of the ease of component replacement, building the system by distributed
objects is also beneficial in the maintenance and upgrades of the system. At the same time, we
aim at providing the system with high availability. It is achieved by using the component-level
fault-tolerant group technique.
In traditional commercial activations, trading can function through wired network
communication applications. Nevertheless, the definition of "communications" changed forever
with the introduction of Internet. The future communication style have no other choices but rely
on internet and mobile network, which can be treated as a extension of Internet, with more people
in business activities. We have implemented the decision-making logic and flow-control logic of
the middleware for the proposed wireless Internet business system. The high system availability
and scalability is achieved by using fault-tolerant CORBA components and other techniques,
such as XML and the Java programming language.