[ Up: Operation Reference ]

The UpdateBarrier operation provides a "gate" mechanism to the Workspace. The operation will only bring its data input up-to-date when the Trigger input has been updated.This allows parts of the workflow to lie in wait of a trigger event, such as a button press in a user interface.NOTE: Each time the value input is brought up-to-date, the operation resets the trigger, meaning that the operation will continue to act as a gate for future updates.See also: Understanding Update Barrier

Default label: "Update barrier"
Member of plug-in: Built-in
Catalogue path: Builtin
Polymorphic: UpdateBarrier is a Polymorphic Operation. One or more of its inputs and outputs are not listed below because they are created dynamically whenever the operation changes its data type, and when it is first created.

Inputs:
Enable Barrier	bool	If enabled, the UpdateBarrier will act as a "gate" on the workflow, and only update its value input when the trigger is updated. If not, it will simply pass data from its value input straight through.
Trigger	CSIRO::DataExecution::Dependency	When this input is updated, the operation will bring its value input up-to-date - not before. The input can be connected to a QPushButton to allow a user-interface to provide a 'trigger' for upstream parts of the workflow.
Value	CSIRO::DataExecution::Dependency
Default value	CSIRO::DataExecution::Dependency	This input specifies that output value that the operation will provide while the trigger has yet to be activated.
Outputs:
Value	CSIRO::DataExecution::Dependency