Icon class icon_class fas fa-quote-left icon_class_computed fas fa-quote-left Related content GOTCHA: Just because an InitialNode MAY have more than one outgoing ControlFlow and offers tokens on every outgoing ControlFlow does NOT mean that every outgoing edge takes a control token; InitialNode does NOT act like an implicit fork! ExecutableNode has implicit fork 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 INFO UML keywords Behavior Activity Activity Diagram ExecutableNode implicit join ControlFlow ActivityNode::outgoing token control token implicit fork Previous snippet Full quote 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 of the flow of control from the ExecutableNode to its outgoing ControlFlows. Next snippet Related snippets A ControlFlow is an ActivityEdge traversed by control tokens or object tokens of control type, which are use to control the execution of ExecutableNodes no_executable_nodes ObjectFlows may not have ExecutableNodes at either end. An ExecutableNode is a kind of ActivityNode that may be executed as a step in the overall desired behavior of the containing 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. While the ExecutableNode is executing, it is considered to hold a single control [token] indicating it is execution [executing]. Related snippets (backlinks) The outgoing ActivityEdges of an InitialNode must all be ControlFlows. The control token placed on an InitialNode is offered concurrently on all outgoing ControlFlows. InitialNodes are an exception to the rule that ControlNodes cannot “hold” tokens, but only manage their flow. Visit also Visit also (backlinks) Flags
