> For the complete documentation index, see [llms.txt](https://ampersandtarski.gitbook.io/documentation/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://ampersandtarski.gitbook.io/documentation/architecture-of-an-ampersand-application/hooks.md).

# Hooks

Hookpoint use the following naming convention:

* camelCasing
* start with *pre* or *post* to define if hooks are called before or after the following position
* specify classname or file where hookpoint is positioned
* specify functionname where hookpoint is positioned
* optionally specify postion within function where hookpoint is positioned

Current list of hookpoints:

| Hookpoint                          | Extensions that use it                       |
| ---------------------------------- | -------------------------------------------- |
| postDatabaseReinstallDB            | ExecEngine                                   |
| postDatabaseUpdate                 | Mutation (experimental), Mqtt (experimental) |
| postDatabaseInsert                 | Mutation (experimental), Mqtt (experimental) |
| postDatabaseDelete                 | Mutation (experimental), Mqtt (experimental) |
| preDatabaseCloseTransaction        | ExecEngine                                   |
|                                    | postDatabaseCloseTransaction                 |
| postDatabaseAddAtomToConceptInsert | Mqtt (experimental)                          |
|                                    | postDatabaseAddAtomToConceptSkip             |
| postDatabaseDeleteAtom             | Mqtt (experimental)                          |
|                                    | postDatabaseStartTransaction                 |
| postDatabaseCommitTransaction      | Mqtt (experimental)                          |
|                                    | postDatabaseRollbackTransaction              |

More hookpoints will be defined when needed.