Routing via a global ESB

The first architecture to consider is that of the Global Enterprise Service Bus. In this pattern, requests for service access are first processed by the local ESB. If not resolved , the request is then forwarded to the Global ESB, which in turn routes the request to the ESB instance able to handle the request.

Federated Global ESB

This pattern offers a consistent routing approach in which each ESB's content based routing rules simply route to the global bus if a request cannot be resolved. It does however have some major drawbacks: it is a central point of failure and traffic on the Global bus could act as a choke point for the entire SOA.

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