Icon class icon_class fas fa-quote-left icon_class_computed fas fa-quote-left Related content uml101 - Activity Diagram - notation - REFERENCE CARD Source Unified Modeling Language 2.5.1 Copyright information About Object Management Group copyright in text extracts quoted from OMG specifications for educational purposes Snippet kind CONSTRAINT UML keywords ObjectFlow Previous snippet Full quote no_executable_nodes ObjectFlows may not have ExecutableNodes at either end. inv: not (source.oclIsKindOf(ExecutableNode) or target.oclIsKindOf(ExecutableNode)) Next snippet Related snippets Related snippets (backlinks) An ObjectFlow is an ActivityEdge that is traversed by object tokens that may hold values. Object flows also support multicast/receive, token selection from object nodes, and transformation of tokens. An ExecutableNode is a kind of ActivityNode that may be executed as a step in the overall desired behavior of the containing Activity. Generally, the ControlNodes and ObjectNodes in an Activity are largely there to control the sequencing and to manage the flow of data between the ExecutableNodes of the Activity. All concrete kinds of ExecutableNodes are Actions ... An ExecutableNode is an ActivityNode that carries out a substantive behavioral step of the Activity that contains it. An ExecutableNode may also consume and produce data, but it must do so through related ObjectNodes (Actions use Pins for this purpose ... An ExecutableNode shall not execute until all incoming ControlFlows (if any) are offering tokens. That is, there is an implicit join on the incoming Control Flows. Specific kinds of ExecutableNodes may have additional prerequisites ... Before an ExecutableNode begins executing, it accepts all tokens offered on incoming ControlFlows. If multiple tokens are being offered on a ControlFlow, they are all consumed. The effect of object tokens accepted from ControlFlows is not specified (see isControlType for ObjectNodes ...), but the semantics above applies if the effect is to execute the ExecutableNode. While the ExecutableNode is executing, it is considered to hold a single control [token] indicating it is execution [executing]. In some cases, multiple concurrent executions of an ExecutableNode may be ongoing at one time (see the semantics of isLocallyReentrant=true for Actions ... ). In this case, the ExecutableNode holds one control token for each concurrent execution. When an ExecutableNode completes an execution, the control token representing that execution is removed from the ExecutableNode and control tokens are offered on all outgoing ControlFlows of the ExecutableNode. That is, there is an implicit fork ... Visit also Visit also (backlinks) Flags
