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Future Aeronautical Communications Part 4

Tham khảo tài liệu 'future aeronautical communications part 4', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | SOA-Based Aeronautical Service Integration 63 As indicated in Fig. 2 a MOM system can deliver message across networks via a centralised message server or it can distribute routing and delivery functions to each client machine. The client can continue requesting information from the data store or performing other operations while delivering messages to the JMS API. 2.2.4 Enterprise service bus An Enterprise Service Bus ESB is a common implementation solution that allows services to be used in a productive system. An ESB provides coarse-grained interfaces with the purpose of sharing data asynchronously between applications. Such integration architecture pulls together applications and discrete integration components to create assemblies of services to form composite business processes which in turn automate business functions in a real-time enterprise. The rise of multiple ESBs is a result of iterative SOA implementation approaches. An ESB provides but not limited to the following functions Messaging functions such as transformation delivery and routing Service registry and metadata management for the storage and discovery of services Adapter functions supporting various communication protocols Support to allow service composition orchestration in business processes through WS-BPEL. Security management in order to provide authorization authentication and the creation of the policies Management monitoring and configuration of the management components life cycle logging and auditing 2.2.5 Data distribution service Data Distribution Service DDS is a newly adopted middleware specification for distributed real-time applications introduced by Real-Time Innovations RTI in 2003. It is a standard implementation of Object Management Group OMG and is used in many time-critical and data-critical applications such as industrial automation robotics air traffic control and monitoring and transaction processing. DDS is aimed at a diverse community of users requiring data-centric .