Microservices architectures – Thoughts from a SOA perspective by The Cattle Crew

 

clip_image002A frequently discussed topic these days is the Micorservices architectural paradigm. Discussions on various internet blogs and forums are showing the trend that proponents of this approach are not tired of emphasizing why Microservices are different to a holistic SOA approach, when dealing with breaking up or avoiding monolithic software architectures.

For this reason it’s time for the Cattle Crew team, to take a closer look on this arising architectural style and the corresponding discussions from a different perspective.

Microservices Architectures

Amongst others Martin Fowler published a blog about what is characteristic for Microservices and applications build on the foundation of this architectural style [1].  According to this and other blog posts (see also [2], [3]), the goal of a Microservices approach is to avoid software systems to become monolithic, inflexible and hardly manageable, by splitting a system into modular, lightweight and maximum cohesive services. Applications build on this architecture should ensure the agility regarding changes caused by changed business requirements, because affected services of an application can simply be adapted and be redeployed independently from other components.

Effectively a Microservice is a in itself cohesive, atomic application, which fulfills a dedicated purpose. Therefore it encapsulates all needed elements, e.g. UIs, logic components, may also have its own separated persistent store and may run in a separate JVM, to ensure as less impairment to other services as possible. Furthermore the implementation technologies for a specific service may vary. For each service the best-fitting technology should be used; there should be no restrictions regarding the used technologies.

To ensure consistency as well as compatibility with already existing components in case of changes and to guarantee seamless release management of changed components, a Continuous Delivery procedure is indispensable for succeeding. In addition the implementation efficiency benefits from the Microservices approach, because different components may be developed in parallel. Communication between the services, if needed, is done via lightweight protocols such as HTTP. Well defined interfaces are depicting the service contracts.

Where there is light, there is also shadow… Read the complete article here.

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About Jürgen Kress
As a middleware expert Jürgen works at Oracle EMEA Alliances and Channels, responsible for Oracle’s EMEA Fusion Middleware partner business. He is the founder of the Oracle SOA & BPM and the WebLogic Partner Communities and the global Oracle Partner Advisory Councils. With more than 5000 members from all over the world the Middleware Partner Community is the most successful and active community at Oracle. Jürgen manages the community with monthly newsletters, webcasts and conferences. He hosts his annual Fusion Middleware Partner Community Forums and the Fusion Middleware Summer Camps, where more than 200 partners get product updates, roadmap insights and hands-on trainings. Supplemented by many web 2.0 tools like twitter, discussion forums, online communities, blogs and wikis. For the SOA & Cloud Symposium by Thomas Erl, Jürgen is a member of the steering board. He is also a frequent speaker at conferences like the SOA & BPM Integration Days, JAX, UKOUG, OUGN, or OOP.

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