Migration of a Chosen Architectural Pattern to Service Oriented ...

Chapter 4. Service Oriented Architecture 100Summarizing, introduction of SOA requires positive attitude of IT staff becauseit is not an easy task and requires some overhead. It challenges theirexperience and ability of creative thinking, but in long range it brings a lot ofnon-trivial benefits which enhance quality of a pro duct and associated processes.Summarising, introduction of SOA requires positive attitude of IT staff becauseit is not an easy task and requires some overhead. It challenges theirexperience and ability of creative thinking, but in long range it brings a lot ofnon–trivial benefits which enhance quality of a product and associated processes.4.8 SOA ManifestoService Oriented Architecture is not standardised and different vendors may haveslightly different understanding of this specific type of architecture, but the mainidea remain the same. Diversity of implementation provided by different SOAvendors is an advantage of SOA.Nevertheless lack of clear explanation what exactly SOA is, leads to manydifferent misconceptions and misunderstanding like presented in [47] [14]. Thisproblem was notified by leading SOA experts and resulted in SOA Manifestoannounced in October the 4th 2009 during SOA Symposium in Rotterdam. Themanifesto is following [1]:Service orientation is a paradigm that frames what you do. Service–orientedarchitecture SOA is a type of architecture that results from applying serviceorientation.We have been applying service orientation to help organizations consistentlydeliver sustainable business value, with increased agility and cost effectiveness,in line with changing business needs.Through our work we have come to prioritize:Business value over technical strategyStrategic goals over project–specific benefitsIntrinsic interoperability over custom integrationShared services over specific–purpose implementationsFlexibility over optimizationEvolutionary refinement over pursuit of initial perfectionThat is, while we value the items on the right, we value the items on the leftmore.However, the manifesto tries to clarify the concept of SOA, it has been criticised.The main objection is that the manifesto is ambiguous, consequently someauthors like Joe McKendrick [55] try to explain and motivate Manifesto statements.Nevertheless the manifesto is a good omen that brings some clarification