Union

Description

Union merges multiple branches into one branch.

In the Streaming processing mode events from the incoming branches are passed to the output branch without an attempt to combine or match them.

In the Request-Response mode the Union node is used to combine outputs from different scenario branches into just one output. The reason for this is that in the Request - Response processing mode only one response sink can return value. If there are parallel branches of processing the Union node will merge merge them into one. You still have to use Collect node to collect results of processing in each of the merged branches. Check Introduction to Scenario Authoring for details on how to interpret the scenario graph in different processing modes.

The #input variable will be no longer available downstream the union node; a new variable will be available instead, its name is configured in the union node.

Branch names visible in the node configuration form are derived from node names preceding the union node.

Parameters and configuration

The following parameters apply to Request - Response mode only.

Name	Description
Output variable name	This variable will hold result of the UnionMemo node
Output Expression	When event arrives from a particular input branch, the output expression defined for this branch is evaluated and passed to the output branch. The expressions defined for all incoming branches need to be of identical data type. In the example above it is always a record containing fields branchName and value. Note, that the #input variable used in the Output expression field refers to the content of the respective incoming branch.