AMQP Specification Transport

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AMQP Specification. Link Peer Partner ==================================================================== *create link end* LINK(name=N, handle=1, ----------> *create matching link end* direction=OUT, local=A +---- LINK(name=N, handle=2, remote=B, ...) / direction=IN, local=B, filter="...")
AMQP Specification. Link +----------------+ +----------------+ | Link_1 | | Link_1 | |----------------| |----------------| | direction=OUT || direction=IN | | transfers-sent | | | | transfers-rcvd | | transfer-limit | | | | | +----------------+ | | +----------------+ | | | +---------+ | ... | Session | ... | +---------+ | | | +----------------+ | | +----------------+ | Link_N | | | | Link_N | |----------------| | | |----------------| | direction=IN || direction=OUT | | transfers-rcvd | | transfers-sent | | | | transfer-limit | +----------------+ +----------------+ 5.4 Controlling Outgoing Transfers Each message transfer sent on a session increments the sent transfer count for the link on which it is sent. AMQP peers must not send transfers in excess of the current transfer limit of a link. If the transfer limit is reduced by the receiving peer when transfers are in-flight, the receiving peer may either handle the excess transfers normally or detach the session with a transfer-limit-exceeded error code. In the latter case if a session resume is attempted, the receiving peer should delay the session resume handshake until sufficient resources are available to handle the previously attempted in-flight transfers. +--------+ M1 -->| Link 1 |----+ +--------+ | | +---------+ ... ----+---- M1, M2 ---->| Session |----> | +---------+ +--------+ | M2 -->| Link N |----+ +--------+ | | | if transfers-sent >= transfer-limit then block M: Message Transfer 5.5 Controlling Incoming Transfers The FLOW and DRAIN commands control incoming transfers for a specific link. The FLOW command updates the transfer limit for the specified link. The DRAIN command tells the peer to send any immediately available transfers, and then set the transfer limit equal to the sent transfer count, thus stopping the link. Once the DRAIN command is complete, the link will be stopped, and any immediately available transfers will have been sent if permitted by the transfer limit prior to receiving the DRAIN. These commands may be used to provide a variety of different behaviors for receiving messages. AMQP Transport v. 1-0 Page 43 of 83
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