Soa why

Connection this. Statement ; Result. List ; while rs. Correct code! Row Result. Set rs, int row. Now: To the agenda of the day! Is SOA important? Week] 2. The next current? What is SOA? Why SOA? Both architectures are similar in the sense that they concern the development of systems through published services, so the question is not unfair. When the concept of a Service Oriented Architecture was launched, the idea was that if you build a service that provides a common function, it would be a waste to keep it from others in the organization.

The underlying premise is that writing software is expensive, and multiple implementations allow for different interpretations of what actual services should be provided. By making your services available to the entire organisation you get a single source of truth, and nobody needs to re-invent the wheel. As such, SOA is more about responsibilities and where they lie in the organization, rather than things like application size and the technologies used.

Now, if we have a central location where all services are registered, service clients need no longer worry about how to find them, nor how to communicate with them.

So how is that wrong? This causes friction, because you can no longer consider the service interface as fully your own, and unexpected from the viewpoint of the users changes may break other applications.

You are left with basically two alternatives: create different versions of the interface, or coordinate releases over the boundaries of applications or even departments. Platform solutions such as the Enterprise Service Bus soon targeted this problem, allowing you to quickly develop variations on services, but also use service composition and create aggregated interfaces.

You create the basic service once, and then implement the variations in the ESB. As a result we have a feature-rich and highly volatile interface layer with actual business functionality in it, which often prevents development agility for the back-office applications through the rigid interface specifications.

Where it does support agility, is in the Middleware layer itself, either duplicating business functionality, or else creating confusion around business ownership of that functionality.

Before long the middleware layer is a more important platform than that of the back-office applications. At the core, the problem is one of apparently conflicting goals: combining high-quality software with a quick time-to-market. The first forces IT into using strict rules on development practices, while the second searches for ways to circumvent those rules.

At the same time, both goals clamor for high levels of reuse to reduce cost. Unfortunately, the most important effect of chasing reuse in the context of strict specifications and high-productivity platforms, is that all applications are increasingly tied together into a giant ball of mud. No application can be changed without implications to many others, and release cadences of once per four months or slower have become the norm in many large organizations. Naturally, neither side thought the other could ever do this right, and both would love to do it.

But the thing is: there still is this big ball of mud in the room, and it has elephant-like proportions. Now: To the agenda of the day!

Is SOA important? What is SOA? Why SOA? At the lowest level we have our meat, the bit that actually does Stuff. This can be EJB or whatnot.

Next up we have BPEL I dozed off briefly so I really don't remember how the two tie together , then above that we have that old dead horse, web services. Blog Source system. Diagrams generated from code are mostly useless. SQL injection — Scalability e.