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### Use Cases

Possible use cases are the following:

- Execute graphs in chain

- Email notification about graph failure

- Email notification about graph success

- Backup of data processed by graph

#### Execute graphs in chain

For example, we have to execute graph B, only if another graph A finished without any error. So there is some kind of relation between these graphs. We can achieve this behaviour by creating a graph event listener. We create a listener for `graph finished OK` event of graph A and choose an `execute graph` task type with graph B specified for execution. If we create another listener for graph B with `execute graph` task with graph C specified, it will work as a chain of graphs.

Figure 24.3. Event source graph isn't specified, thus listener works for all graphs in specified sandbox

#### Email notification about graph failure

Figure 24.4. Web GUI - e-mail notification about graph failure

#### Email notification about graph success

Figure 24.5. Web GUI - email notification about graph success

#### Backup of data processed by graph

Figure 24.6. Web GUI - backup of data processed by graph

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