Failure Arrow

Overview

The Failure flow control arrow is color coded red. It stems from a parent object (i.e. Condition, Sub-Workflow, Task, Process) in a workflow and proceeds only if the parent object fails. It is normally used to modify the path of a workflow as a result of task failure. In such cases, the failure arrow can link to an alternate task that corrects the issue encountered by the failed task or alerts the proper authority of the failure. See Flow Control Arrows for more details.

Related Topics  

Examples

The sample workflows below illustrates usage of the failure arrow.

EXAMPLE 1 - Conditional Branching

Flow control arrows allow conditional branching to take place by determining a workflow’s progress depending on specific events or conditions that transpire. The sample workflow below illustrates exception handling by way of conditional branching at its simplest form. A workflow executes along the path of any arrow containing the value equaling that of the previous object. Therefore, if Task1 completes successfully, execution follows the path containing the Success (green) arrow and runs Task 2 on Agent 2. If Task1 fails, execution follows the path containing the Failure (red) arrow and runs Task 3 on Agent 3 instead.

 

EXAMPLE 2 - Multi-execution

Another scenario would be to execute two or more tasks simultaneously in the event of a failure. As shown in the example below, if Task 1 is successful, the workflow follows the path of the Success arrow and runs Task2. However, if it fails, execution follows both of the Failure arrows that are assigned. Both failure tasks will execute simultaneously.

 

EXAMPLE 3 - Evaluations linked to Failure arrow

Along with a Result Arrow, an Evaluation object can also be followed by a Failure and/or Success arrow. This is because Evaluation objects treat a TRUE/YES result as a success and a FALSE/NO result as a failure. As shown in the example below, the Evaluation object evaluates 5=7 which is false, therefore, the workflow follows the Failure arrow which runs Task 4.

 

EXAMPLE 4 - Error Handling

Failure arrows can be used handle errors that may occur, or at least link to a task that can handle the error. In the example below, if Task 1 fails, a Failure arrow sends the workflow to task that can fix the error.

Additional Notes

There are some basic practices to follow when using arrows to link from one object to another:

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