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4) SOA

Service Oriented Architecture

QuestionAnswer
SOA - distributed systems architecture - consist of services - the service is defined in terms of the messages exchanged between provider and requester - description is published in machine-processable form - few operations with complex messages
Software services Software services are self-contained, platform-agnostic computational elements that support rapid, low-cost and easy composition of loosely coupled distributed software apps
Service-based applications independent sets of interacting services offering well-defined interfaces to their potential users using the principle of loose coupling
ASP - customer views in the browser, - runs at the provider
Web Service - application partially runs at the customer, - party at the provider
middleware technologies Middleware is the software that connects software components or enterprise applications. Middleware is the software layer that lies between the operating system and the applications on each side of a distributed computer network.
Informational services simple in nature, provide access to content & multiple-data sources. Interact with an end-user by means of simple request/response sequences (stateless & synchronous)
Complex services involve the assembly and invocation of many pre- existing services, possibly in diverse enterprises, to complete a multi- step business interaction
Service Facade Facade logic is placed in between the contract and the core service logic. This allows the core service logic to remain decoupled from the contract
Service Facade 4 elements 1) Structural façade 2) Behavioral façade 3) Policyfaçade 4) Vocabulary and best practices façade:
Structural façade defines the service types,messages,interfaces& operations (service signature).
Behavioral façade entails understanding the effects & side effects of service operations & semantics of input & output messages, e.g., how can we cancel or update an order.
Policyfaçade describes policy assertions and constraints &QoS considerations on the services between interacting parties. It: • prescribes, limits, or specifies any aspect of a business agreement.
Vocabulary and best practices façade common business processes • common data-interchange formats • common terminology at the level of data items and messages to bridge varying service terminologies.
Enterprise Service Bus standards-based IT backbone that leverages Messaging Oriented Middleware functionality to connect heterogeneous systems
Key features of the Enterprise Service Bus – WebServices:SOAP,WSDL,UDDI – Event-based,asynchronous delivery – Transformation – Routing: Publication/Subscribe, content-based, ...
Distributed ESB Distributed ESB allowing geographically dispersed organizations to cooperate
Integration Broker This is where all the adapters are connecting to , leading to the new high level management software
Reliable Messaging Model 1) AtLeastOnce 2) AtMostOnce 3) ExactlyOnce 4) InOrder
Created by: timeakiss