SE401:Group33:Research:Mark:Developing Web Services

Developing Web Services

IEEE Exp. DB.
Title: Developing Web Services
A: Adam Bosworth {Crossgain Corporation}

Page 1

• Web Services have arisen to componentise(I may have invented a word here!) Web applications.
• Web services emergence has been hindered by cost.
• Web services provides a service over Internet protocols, for another program to use.
• [ Examples of web services ]

Page 2

• IP is asynchronous and unreliable.
• Web services can :"increase the speed or service reliability because messaging processing does not assumes an unreliable communications infrastructure." - ##How will we impact on these##
  • The classic telephone-mail metaphor. Mail: Message could be delivered even if the service is unavailable. Messages can be sent without the need for feedback.
  • "Loosely coupled services are often required for Web Services due to the uncertainties" - ##What will bring down our system, can it offer any guarantees..##

Section 2.2 - Service should Support Dynamic Hardware Scaling

• Where one machine can not cope with the load, more machines are added (with possible separation of duties with regard to database logic, handling requests etc.)

Page 3

• Problems to solve in the multi server architecture.
  1. Dynamic Load Balancing
  2. Hardware Scaling
  3. Inter-Enterprise Integration Service