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Reuse and investment protection also results from the adherence to standards. Not only can developers swap out ESB components, or use components in another JBI-standard ESB, but they can swap out the entire ESB and still use the standard plug-in components.

SM ServiceMix allows plug-in services which can combine to create
a service oriented architecture. SM ServiceMix allows these services to
operate in an event driven way as well. In other words, the services
are decoupled and listen on the bus for service requests. The
bus is responsible for quality of service (QoS) features such
as message persistence, guaranteed delivery, failure handling,
and transaction support.

SM ServiceMix supports event driven architecture for events occurring
both internal and external to the bus. In other words, JMS binding
components can listen for the arrival of messages, i.e., the "event"
on topics or queues which are external to the bus, while other
binding components and service engine components can listen for
messages on the bus.

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