Non-blocking flow control ------------------------- Key: JGRP-2172 URL: https://issues.jboss.org/browse/JGRP-2172 Project: JGroups Issue Type: Feature Request Reporter: Bela Ban Assignee: Bela Ban Fix For: 4.0.4 Sending a message through FlowControl (UFC, MFC) should not block if {{Message.Flag.NB_FC}} (non-blocking flow control) is set. Instead, the message should be added to a queue (bounded if {{max_size}} > 0, else unbounded). The max queue size is given in bytes, so we can estimate what the memory penalty for reaching that size would be (if bounded). The queued messages are sent when credits arrive. TBD: when credits arrive, should blocked threads or queued messages be released first? Non-blocking flow control can be used by both external and internal threads. If the queue is unbounded, then it is the responsibility of the application (e.g. Infinispan) to make sure the queue doesn't grow to an untenable size.