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These objects capture protocol endpoint state. An endpoint is an entity responsible for remembering key state for a given participant in a multi-way conversation. Connections, Sessions, and Links are all endpoints. Connections capture Links track all the state associated with an AMQP Connection. This includes the state of multiple Sessions that may be occuring over a given Connection, and whatever Links are established over those Sessions. conversational state relating to message transfer between a specific Source and Target. There can be multiple Links established simultaneously on a single Session, and multiple Sessions established simultaneously on a single Connection, therefore each Connection endpoint may contain multiple Session endpoints, and likewise each Session endpoint may contain multiple Link endpoints At any given point in time a Connection object endpoint will be associated with at most one TCP connection Connection (see Transport). Sessions provide basic multiplexing of a Connection. Sessions cannot exist without their parent Connection. Within a Session, Links provide the context for Message transfer between a source and target. 

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