By Jeff Davies, Ashish Krishna and David Schorow
Company provider Bus (ESB) is a sizzling subject this present day. Many proprietors are both development new
products during this class or dressing up their present items to pitch them as an ESB. However,
there isn't any truly accredited definition of what an ESB is, or what its structure or
programming paradigm may still be.
In this publication, Jeff Davies introduces you to ESBs commonly and BEA’s AquaLogic Service
Bus specifically. He contains many examples and transparent, comprehensible reasons of the
product and the way it may be leveraged to enforce a couple of ESB use situations. he's taking the
very functional and helpful method of identifying one of many best items within the ESB category
and doing a “show and inform” rather than delving right into a lot of philosophical discussions and arguments
about numerous contrasting architectures or definitions for an ESB. The publication is very
readable and instructive. As one of many architects of the 1st unencumber of the product, i believe this
book is a superb creation to AquaLogic provider Bus.
Read or Download The Definitive Guide to SOA BEA AquaLogic Service Bus PDF
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Extra info for The Definitive Guide to SOA BEA AquaLogic Service Bus
If you have the same service running on five different machines, ALSB can roundrobin or otherwise load balance the calls among those servers. Location transparency allows you to add, remove, and change service endpoints without having to recompile your clients or perform some DNS trickery. The second reason to invoke ALSB instead of the end services is service aggregation. Not every proxy service in ALSB has to represent a single business service. A proxy service can invoke any number of business services, and can apply conditional logic to select the right subset of business services, depending on the needs of the caller.
Business services are defined in ALSB to represent services that are external to ALSB. For example, the HelloWorld service you created at the beginning of this chapter is external as far as ALSB is concerned. For ALSB to be able to call the HelloWorld service, you have to create a business service in ALSB. We often think of a business service as the client stub that ALSB uses to interact with external services. As for the external services, we refer to them as service providers. ” There are five reasons.
Monitoring ALSB provides a robust set of features around monitoring. The service bus console allows you to look proactively at the state of your entire ESB. For reactive monitoring, ALSB allows you to define alerts for conditions that you define. You can send these alerts via Simple Network Management Protocol (SNMP) traps to thirdparty monitoring programs, such as Hewlett Packard’s OpenView or AmberPoint’s SOA Management System. Also, alerts can be delivered via e-mail to specified recipients.