Diary of a Fence Sitting SOA Geek
In this presentation, Mark Little explains the history of SOAP/WSDL/WS-*-based web services and RESTful HTTP and highlights how the two approaches might converge into a single solution.
- SOA,
Tracking change and innovation in the enterprise software development community
Posted by Mark Little on Apr 11, 2007 04:22 PM
The OASIS WS-Context specification has been approved as an OASIS standard, with no votes against it. The committee has been working on WS-Context under the WS-CAF umbrella of specifications, which also includes the WS-CoordinationFramework and WS-TransactionManagement specifications. Although WS-Context is unique in what it defines, there is overlap with the latter two specifications and what is going on in the WS-TX committee, which is backed by IBM and Microsoft (and started years after WS-CAF). Therefore, it is unlikely that any other standards will come out of the WS-CAF group.There has been a lot said about WS-Context over the years, most recently at the W3C workshop on Web of Services and in the majority it has drawn positive comments. In summary, WS-Context defines a basic (extensible) context structure that can be associated with an abstract activity: the lifetime of the activity is the lifetime of the context. The activity can then be used to model a session: all interactions on a session-oriented service in the scope of an activity will be uniquely and unambiguously tied to that activity through the context. Importantly, the context (and hence session) is not tied to the endpoint reference of the service: the same service can be addressed by multiple clients or services in the scope of different sessions concurrently. The session concept is therefore loosely coupled with respect to communication channels and service endpoints: the session may be used in conjunction with a service for a short period or even shared across multiple services. Late binding also means that protocols may use WS-Context to support either ephemeral or long-lived sessions associated with a fixed service endpoint definition as appropriate within an application.
Although there may appear to be overlaps with WS-Addressing, the two are more complimentary than competitive. Think of the possible relationship like URIs and cookies in the traditional Web. If used together and used right, loosely coupled, scalable stateful and stateless interactions in Web Services are possible. If used incorrectly, or ignored then closely coupled, brittle systems can result. Whether WS-Context has a big impact on the evolving Web Services architecture remains to be seen. The fact that IBM and Microsoft were not involved will certainly hinder the take-up and influence.
Service Quality and Validation eKit
Testing Tools to Support Agile Software Delivery
Real World REST & Document-Oriented Distributed Databases Tracks @ QCon SF Nov 19-21
In this presentation, Mark Little explains the history of SOAP/WSDL/WS-*-based web services and RESTful HTTP and highlights how the two approaches might converge into a single solution.
Platforms need interoperability. In this article Flex interoperability with JSON and XML is explored including direct mapping to chart and grid components.
Michael Mah analyzes the development process in 5 companies: 2 Agile (one of them BMC) and 3 classic. He presents the factors which contributed to the success of BMC's Agile adoption.
In this interview filmed at RubyFringe 2008, Tom Preston-Werner talks about how both Powerset and GitHub use Ruby and Erlang, as well as tools like Fuzed, god, and more.
David Laribee discusses the purpose of ALT.NET, its mission and future.
Ruby on Rails has become a popular Ruby framework for creating web applications in recent years. An aspect of creating a web application is the need to repeatedly create the same base functionality.
Steven Haines talks about tackling web application performance tuning by proposing a method called wait-based tuning.
Shaw and Fowler talk about the need for a new relationship between the business department and the IT department. Studies have shown that projects mostly fail due to miscommunication between the two.
1 comment
Reply