Service Virtualization: Key to Managing Change in SOA

Service Virtualization
Key to Managing Change in SOA
Authored by Andrew Nash,
Chief Technology Officer, Reactivity
ABSTRACT
Load balancers, name servers (e.g. DNS), even stock brokerage services are existing examples of virtual services in the worlds of networking and financial services. In the arena of Service Oriented Architectures (SOA), virtual services and their supporting abstraction layer are critical to address the operational, integration,security and life cycle issues that delay and derail SOA deployment and success. This paper will introduce the concept of virtual services for SOAs and provide details of the characteristics of virtual services that enable SOA success.
© 2006, Reactivity, Inc.WHITEPAPER
Contents Virtualization and Abstraction????????????????????????????????????????????????? 3 Legacy Implementations????????????????????????????????????????????????????????????????????8Stock Brokerage Services????????????????????????????????????????????????????????????????????3 Virtual Services ????????????????????????????????????????????????????????????????????????? 8Networking Services????????????????????????????????????????????????????????????????????????????3 Service Abstraction Layer????????????????????????????????????????????????????????? 9So What is a Virtual Service?????????????????????????????????????????????????????? 4 Addressing and Location?????????????????????????????????????????????????????????????????10The Promises of Service Oriented Architecture?????????????????????? 4 Routing and Filters?????????????????????????????????????????????????????????????????????????????10Loose Coupling - at least a minor grail?????????????????????????????????????????5 Data Hiding and Privacy???????????????????????????????????????????????????????????????????10Change Happens??????????????????????????????????????????????????????????????????????? 5 Security Mechanisms????????????????????????????????????????????????????????????????????????10Service Versioning?????????????????????????????????????????????????????????????????????????????????6 Mapping and Translation?????????????????????????????????????????????????????????????????10Service Retirement????????????????????????????????????????????????????????????????????????????????6 Transport Mediation??????????????????????????????????????????????????????????????????????????10New Versions of Standards?????????????????????????????????????????????????????????????????6 Load Balancing and Failover???????????????????????????????????????????????????????????10Optional Subsets within Standards?????????????????????????????????????????????????6 Virtual Service and Policy Control of Application Systems??11Increased Sophistication and Governance Requirements?????7 Adding SOA Components??????????????????????????????????????????????????????? 11Every Service Consumer is Different???????????????????????????????????????????????7 Getting Started with Virtual Services???????????????????????????????????? 12Geographical Constraints???????????????????????????????????????????????????????????????????7 For More Information?????????????????????????????????????????????????????????????? 12
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Service Oriented Architecture and Web Services represent a make recommendations about the likely direction that future significant opportunity to develop business systems that can trading will take.adapt to business requirements in a timely and effective manner. In this analogy, stock exchanges provide concrete or However, operational characteristics of real SOA deployments implemented services; the broker provides a virtual service; may derail much of the expected return on investment. and the additional values that we derive are provided by the Service virtualization addresses the critical operational, abstraction layer provided by the stock broker.integration and life cycle issues that can derail or delay Service Oriented Architecture implementations. Without addressing Networking Servicesthese issues through service virtualization and it's supporting Virtual service examples that we are familiar with in the abstraction layer, many of the benefits of an SOA are networking world include services such as name servers and constrained at best and at worst, may not be achieved at all. load balancers.
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