Is there any existed open source project for messaging infrastructure? [closed]

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开发者_如何学Python

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I want to know if there is any open source projects for messaging infrastructure. It will cover most functionalities listed in "Enterprise Integration Patterns". I know there are some open source ESB products which are following this book. But it seems they are too heavy. I only want an elegant messaging infrastructure.

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How about Apache Camel? It implements some of Enterprise Integration Patterns.

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How about Mule?

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I'm not exactly sure what qualifies for an Enterprise messaging infrastructure, but has XMPP been investigated?