Held object tokens are offered to outgoing flows according to the general ordering rules for ObjectNodes. When an offer for a token is accepted by a downstream object node, that token is removed from the CentralBufferNode and moved to the accepting ...

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Unified Modeling Language 2.5.1
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About Object Management Group copyright in text extracts quoted from OMG specifications for educational purposes
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CONSTRAINT
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Activity
CentralBufferNode
token
object token
ObjectFlow
15.4.3.3 Central Buffer Nodes - A CentralBufferNode acts as a buffer between incoming ObjectFlows and outgoing ObjectFlows. It accepts all object tokens offered to it on all incoming flows, which are then held by the node.
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Held object tokens are offered to outgoing flows according to the general ordering rules for ObjectNodes. When an offer for a token is accepted by a downstream object node, that token is removed from the CentralBufferNode and moved to the accepting object node, as for any object node.
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