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Logical Controllers

Logical controllers control test iteration behavior

To add a logical controller to a test, right click on a tree element (must be either a ThreadGroup or Controller element), and select from the controller list the one you want to add. It will be added to the bottom of that elements children.

A logical controller is a controller that regulates the iterative behavior of it's sub-controllers, and sometimes, it can also affect the behavior of its parent controller indirectly. Many logical controllers will simply be elements that a user will drop into their test (in a certain position within the tree hierarchy) with nothing more to do.

Example: Once Only Control

The Once Only Controller causes the controllers under to deliver test cases only once during a test run. Thereafter, those test cases are dropped from the test. In other words, those test cases will be sampled only during the first iteration. There is no configuration required (are possible) for this controller, so it is very simple to use. One might find this controller useful to create a test plan where a login page is sampled only once, and thereafter skipped - which is typical user behavior.

Hypothetical Example: Loop Control

A loop control element would be used to force the test to iterate through certain sub elements multiple times before going on to other test elements. Again, the loop controller would be placed in the tree hierarchy, and all sub elements would be iterated through a specified number of times each time through the test cycle. Such a loop control element would allow the user to configure the loop count.


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