I have been talking about the notion of a service eco-system for some time now. This is a mutually beneficial digital/human enviornment where actors are businesses that can choose to link to a remote resource using Web services. They combine their efforts in a value-net of services; similar to a supply chain, but not just for suppliers and consumers; but for companies who choose to increase their competative edge by joing forces with business services porvided by other participants in the service eco-system.
You need an SOA method to identify services that SHOULD be exposed to your eco-system.
Also there are various layers in your SOA. We call them a SOA Reference Architecure . One of these layers is the data or information management layer. Check out this recent article on aspects of information management for SOA .[Read More]
BPM & Service-oriented Architecture: Insights and Best Practices
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One unique feature of SOA is that it is "fractal." The fractal nature of SOA implies that it is applicable in small projects, to one line of business, several lines of business sharing common services with slight variations, cross enterprise scope, between business partners in a value net and then on a larger scale in the service eco-system.
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Granularity is a tricky topic that I get queried about very often. It's more than a single metric measurement; it's how useful the interface is to you the potential consumer and how you can re-compose it in your own application context.
But there are many consumers out there; at one end of the spectrum are low level API's such as those typically found in packaged applications that vendors expose as Web Services. Then we get the grand bundling of an entire application as a service at the other end of the spectrum.
But it's all about how IT fits the business goals. Allow me to digress. In karate, there is a notion of "maai". It is the distance you have to step back to avoid being punched when the attacker comes in for a punch and the distance you have to step forward in order to be able to strike. 'So, how long is a "maai"?' someone may ask. I don't know how many feet and yes, it depends on ....
Back to SOA. When we do goal-service modeling, the composition of services and their granularity is attached to the sub-goal in the goal tree that you create. Higher level goals requiring services will have larger granularity services.
Granularity is inspired by buisness usage context that maps to business goals fulfillment that translates into what services you need to fulfill a given goal.
Okay, now, we will practice that move one more time. Yoi...(ready)...[Read More]