5 Architectural Choke Point Monolithic Extremely complex Very tightly coupled Difficult to find clean integration points Lack of standards makes it difficult to integrate Rigid architecture makes even small changes complex and costly
8 Service-Oriented Architecture (SOA) is an architectural style. Applications built using an SOA style deliver functionality as services that can be used or reused when building applications or integrating within the enterprise or trading partners.
9 What is a Service? A service provides a discrete business function that operates on data. Its job is to ensure that the business functionality is applied consistently, returns predictable results, and operates within the quality of service required.
10 Characteristics of a Service Supports open standards Loose coupling Stateless Location agnostic
18 What is an Enterprise Service Bus (ESB)? An ESB implements an SOA through middleware that offers virtualization and management of service interactions between communication participants. Thus, this flexible connectivity layer could help connect and integrate an organization's IT infrastructure across many differing systems and locations reliably and securely while reducing the number, size and complexity of application interfaces. ComputerWorld (http://www.computerworld.com/developmenttopics/development/webservices/story/0,10801,108478,00.html)
19 Key Characteristics of an ESB Streamlines development Supports multiple binding strategies Performs data transformation Intelligent routing Real time monitoring Exception handling Service security
20 Mediation Source: Getting Started with WebSphere Enterprise Service Bus V6 http://www.redbooks.ibm.com/redbooks/SG247212/wwhelp/wwhimpl/java/html/wwhelp.htm
28 Describing Services to Machines Web Services Description Language Open Standard for describing Interfaces to Services (http://www.w3.org/TR/wsdl) Characteristics –Describes data expected to be sent and received –Describes what the service can do –Describes how to reach the service WSDL description is an XML document
29 ESB Summary Loose Coupling Location Transparency Transport Neutral
30 Summary The Problem What is Service-Oriented Architecture? Change is Inevitable What is an Enterprise Service Bus? Summary
31 I appreciate your feedback and comments. I can be reached at: Name: Terry Woods Phone: 202-377-3023 Email: Terry.Woods@ed.gov Contact Information
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