# ColdBox Mode Listener

![](https://1825467578-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LA-UVvsc-e1GVkiaPQ-%2F-LA-Ud03e_n2SeqLC9Ls%2F-LA-Us3mbWYmQ-p5vl3Q%2FcoldBoxListener.jpg?generation=1523648146508915\&alt=media)

| **Argument**      | **Type**                                  | **Execution Mode**     | **Description**                                                               |
| ----------------- | ----------------------------------------- | ---------------------- | ----------------------------------------------------------------------------- |
| **event**         | coldbox.system.web.context.RequestContext | **coldbox**            | The request context of the running request                                    |
| **interceptData** | struct                                    | **standalone-coldbox** | The data structure passed in the event                                        |
| **buffer**        | coldbox.system.core.util.RequestBuffer    | **ColdBox**            | A request buffer object for producing elegant content in ColdBox applications |
| **rc**            | struct                                    | **coldbox**            | Reference to the `rc` scope                                                   |
| **prc**           | struct                                    | **coldbox**            | Reference to the `prc` scope                                                  |

So let's say that we want to listen on the beforeInjectorShutdown and on the afterInstanceCreation event in our listener.

```javascript
component{

    function configure(){}

    function beforeInjectorShutdown(event, interceptData, buffer, rc, prc ){
        var injector = arguments.interceptData.injector;
        // Do my stuff here:

        // I can use a log object because ColdBox is cool and injects one for me already.
        log.info("DUDE, I am going down!!!");
    }

    function afterInstanceCreation(event, interceptData, buffer, rc, prc ){
        var injector = arguments.interceptData.injector;
        var target = arguments.interceptData.target;
        var mapping = arguments.interceptData.mapping;

        log.info("The object #mapping.getName()# has just been built, performing my awesome AOP processing on it.");

        // process awesome AOP on this target
        processAwesomeAOP( target );
    }
}
```