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

Chapter 4. Service Oriented Architecture 98Project Management or Agile Testing. World is going to be Agile to the limitsof technical capabilities, therefore short clarification what is Agile in context ofSOA is needed. Taking into account business perspective of SOA, agility can beexpressed as a sum of following factors:1. Reuse [46] [31] [59] – reuse is a kind of very high level goal that peopletried to achieve in many ways, including development of Object Orientationor Aspect Programming. High reuse reduces problem of inconsistency inbusiness data. SOA reuse is even more powerful because it is supported bytechnology independency that (theoretically) eliminates technical barriers.The most important consequence of reusing of a huge amount of code isreduction of risk of failure. The most important consequence of reusing ofa huge amount of code is reduction of risk of failure.2. Independence from technology [46] [31] [59] –Technology dependency is amajor barrier for system evolution and development, especially in enterpriselevelapplications that grow with the enterprise. In result of the grow andtechnological dependencies, applications become a heterogeneous and composedsystems that were separate applications working for specific departments.SOA does not try to convert system to homogenous system. Keepingsystem independent from a technology allows to introduce new solutions ifthey bring additional value to the company. This also reduces cost of improvement/ development of the system by enabling selection of the cheapestvendor on the market.3. More efficient development process [46] [31] [59] – SOA in nature aligns businessprocesses. Identification of business processes becomes identification ofservices and relationships among them. Services are self contained by nature,thereupon it is much easier to test them and integrate into completeprocesses. Moreover, development teams are smaller because their tasks arelimited to a single service or several services that are in a relationship.4. Cost saving [46] [31] [59]–Cost of a project is one of the most importantfactors that may cause project to fail or reduce its scope. Each possiblesaving is a benefit that cannot be snubbed. Saving gained by introductionof SOA is a consequence of previously mentioned advantages. High reusereduces costs of maintenance and project itself. Technology independenceallows choosing the cheapest vendor available on the market. Efficient developmentprocess shortens development time and reduces effort requiredfor communication between individual teams.Personal perspectiveBusiness does not consist only of a set of procedures, goals and company logo.Business is people, people who spend their time trying to achieve company’s goal