You might have seen the recent news reports about the collision between U.S. and Russian communication satellites. The U.S. satellite was one of the Iridium satellites. What wasn’t reported and you probably don’t know is that an object database management system (ODBMS) is an important part of the Iridium system. Even though ODBMSs are a [...]
February 13, 2009
I am now also posting on the Cutter Blog. My initial posting is (The Acronym) SOA is (Perhaps) Dead (at Some Companies); Long Live Services. It is a response to Anne Thomas Manes’ SOA is Dead; Long Live Services on her blog at the Burton Group.
January 9, 2009
The typical definition of an atomic task or process is one that cannot be decomposed further. This is vague and subject to interpretation. The Decomposition Matrix on this site uses a specific definition: A task (for business process diagrams) or a process (for data flow diagrams) is atomic if every input relates to every output [...]
December 3, 2008
My last posting referenced the criteria for a well-formed business process diagram mentioned in Business Process Driven SOA using BPMN and BPEL by Matjaz B. Juric and Kapil Pant. I am going to expand on their criteria to create a more comprehensive definition of a well-formed business process diagram. To start, here are three criteria [...]
November 18, 2008
I recently received two new books on business process modeling. Both books looked interesting because they had great titles. As it turns out, one book is great and the other not so good. The not so good book is Business Process Driven SOA using BPMN and BPEL by Matjaz B. Juric and Kapil Pant. There [...]
October 9, 2008
The Design Decomposition Blog is written by Doug Barry.
A service-oriented architecture is essentially a collection of services. These services communicate with each other. The communication can involve either simple data passing or it could involve two or more services coordinating some activity. Some means of connecting services to each other is needed.
Service-oriented architectures are not a new thing. The first service-oriented architecture for many people in the past was with the use
DCOM or Object Request Brokers (ORBs) based on the CORBA specification. For more
on DCOM and CORBA, see Prior
service-oriented architectures (new window).
Services
If a service-oriented architecture is to be effective, we need a clear understanding of the term service. A service is a function that is well-defined, self-contained, and does not depend on the context or state of other services.
See Service (new window).
Connections
The technology of Web services (new window) is the most likely connection technology of service-oriented architectures. Web
services essentially use XML (new window) to create a robust connection.
The following figure illustrates a basic service-oriented architecture. It shows a service consumer at the right sending a service request message to a service provider at the left. The service provider returns a response message to the service consumer. The request and subsequent response connections are defined in some way that is understandable to both the service consumer and service provider. How those connections are defined
is explained in Web Services explained (new window). A service provider can also be a service consumer.
There are nearly 400 pages of articles on this site with over 130 pages on Web services and service-oriented architecture.
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Service-Oriented Architecture: Concepts, Technology, and Design by Thomas Erl Description: "Service Oriented Architecture is a hot, but often misunderstood topic in IT today. Thomas articulately describes the concepts, specifications, and standards behind service orientation and Web Services. For enterprises adopting SOA, there is detailed advice for service-oriented analysis, planning, and design. This book is a must read!" –Alex Lynch, Principal Consultant, Microsof...
Service-Oriented Architecture: A Field Guide to Integrating XML and Web Services by Thomas Erl Description: Building service-oriented architecture - with less risk, cost, and complexityThe emergence of key second-generation Web services standards has positioned service-oriented architecture (SOA) as the foremost platform for contemporary business automation solutions. The integration of SOA principles and technology is empowering organizations to build applications with unprecedented lev...
Service Oriented Architecture (SOA) For Dummies, 2nd Edition by Judith Hurwitz, Robin Bloor, Marcia Kaufman, Fern Halper Description: Feeling overwhelmed by the buzz about SOA—service oriented architecture? Take heart! Service Oriented Architecture For Dummies, 2nd Edition makes it easy to understand, plan, and implement the latest SOA solutions for your business. Whether you’re the IT person responsible for developing SOA or the executive who’s trying to get a handle on the concept, Service Oriented Architecture...
