By Waseem Roshen
Foreword via Ray Harishankar, IBM Fellow "There are many books out there concerning SOA and SOA's enterprise and expertise worth. This booklet makes a speciality of one of many key technical values of SOA and does a superb activity of describing SOA-based software integration by means of clarifying the connection and styles of SOA with different integration applied sciences in a allotted computing environment." Sandra Carter, IBM vice chairman for SOA, BPM, and WebSphere advertising and marketing "Services orientated Architectures current many demanding situations this present day within the integration of current platforms and new platforms, besides again and again, outdated legacy mainframe functions. This ebook effectively addresses a number of the complexities we see within the integration of SOA and mainframe legacy functions, providing recommendations and methods to combine the purposes with the remainder of the company. the writer takes a sincerely outlined pattern-based process discussing the benefits, instruments and techniques. Readers will enjoy the insights during this booklet whether or not they play the architect position or a developer position on a SOA project."Sue Miller-Sylvia, IBM Fellow and alertness improvement provider zone chief
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Additional info for SOA-based Enterprise Integration: A Step-By-Step Guide to Services-Based Application Integration
Example text
Thus, the data is shared in real time and the problem of stale data is eliminated. The listening application is usually called a server whereas the other application is called a client. Because the overhead associated with applications that communicate through sockets is very low, direct socket programming leads to a very efficient way of communication. It is also interesting to note that most of the modern methods of communications (such as MOM/messages) as well as other methods (such as distributed objects) rely on socket programming under the hood.
These remote objects were able to share functionality and data in much the same way as applications were able to share functionality and data in the case of RPC. The most well-known examples of ORB technologies are CORBA and Java RMI. CORBA, in particular, introduced a number of new ideas related to services and SOA, such as a language-independent service interface, the initial concept of a registry, and the separating into different applications of network-related functionality and the code for marshalling and unmarshalling, which enormously improved code reuse because the same code could be used by a number of different applications.
Of all the concepts, the major driving principle of the march toward SOA-type integration patterns is the idea of loose coupling. This drive for loose coupling has occurred both for technical reasons and for business reasons, which demand agility and flexibility from the IT systems. We pointed out that coupling can occur at different levels, including the physical connection (network connection), communication style (RPC versus asynchronous messaging), system type (weak versus strong type), interaction pattern (distributed versus centralized logic), and service binding (static versus dynamic binding).