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The specialty of this router is that messages are
always in a normalized format, irrespective of the source or destination.
NMR thus acts as a lightweight messaging infrastructure which facilitates
actual message exchange in a loosely coupled fashion. NMR provides
varying QOS functionalities and the three levels of message delivery
guarantee provided by NMR are listed as follows:
Best effort: Message may be delivered only once or more than
once, or even the message can be dropped.
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Java Business Integration
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At Least Once: Message has to be delivered once or more, but
cannot be dropped. Hence, duplicates can exist.
Once and only once: It is guaranteed that messages will be
delivered once and only once.
Pluggable components: The loosely coupled feature of ESB is due to
the pluggable architecture for service components. There are two broad
categories of pluggable components called SE and BC. Pluggable components
can play the role of service provider, service consumer, or both. Pluggable
components are connected to the NMR through a Delivery Channel.


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