markdown_extensions:
  # Python Markdown
  abbr:
  attr_list:
  footnotes:
  md_in_html:
  tables:
  toc:
    permalink: true

  # Python Markdown Extensions
  pymdownx.betterem:
  pymdownx.caret:
  pymdownx.highlight:
    line_spans: __span
  pymdownx.inlinehilite:
  pymdownx.keys:
  pymdownx.mark:
  pymdownx.superfences:
    custom_fences:
    - name: mermaid
      class: mermaid

g-x;\n  color: $dropdown-link-color;\n}\n","@mixin caret-down() {\n  border-top: $caret-width solid;\n  border-right: $caret-width solid transparent;\n  border-bottom: 0;\n  border-left: $caret-width solid transparent;\n}\n\n@mixin caret-up() {\n  border-top: 0;\n  border-right: $caret-width solid transparent;\n  border-bottom: $caret-width solid;\n  border-left: $caret-width solid transparent;\n}\n\n@mixin caret-right() {\n  border-top: $caret-width solid transparent;\n  border-right: 0;\n  border-bottom:...

g-x;\n  color: $dropdown-link-color;\n}\n","@mixin caret-down() {\n  border-top: $caret-width solid;\n  border-right: $caret-width solid transparent;\n  border-bottom: 0;\n  border-left: $caret-width solid transparent;\n}\n\n@mixin caret-up() {\n  border-top: 0;\n  border-right: $caret-width solid transparent;\n  border-bottom: $caret-width solid;\n  border-left: $caret-width solid transparent;\n}\n\n@mixin caret-right() {\n  border-top: $caret-width solid transparent;\n  border-right: 0;\n  border-bottom:...

And then, that system (in this case **FastAPI**) will take care of doing whatever is needed to provide your code with those needed dependencies ("inject" the dependencies).

This is very useful when you need to:

* Have shared logic (the same code logic again and again).

## Mounting a **FastAPI** application

"Mounting" means adding a completely "independent" application in a specific path, that then takes care of handling everything under that path, with the _path operations_ declared in that sub-application.

### Top-level application

First, create the main, top-level, **FastAPI** application, and its *path operations*:

        if (value instanceof Entity) {
            data.register(key, BeanUtil.copyBeanToNewMap(value));
        } else {
            if (value instanceof final Collection<?> coll && !coll.isEmpty()) {
                // care performance for List that the most frequent pattern
                final Object first = coll instanceof List<?> ? ((List<?>) coll).get(0) : coll.iterator().next();
                if (first instanceof Entity) {

ble]{cursor:pointer}[data-widget=expandable-table] i.expandable-table-caret{transition:-webkit-transform .3s linear;transition:transform .3s linear;transition:transform .3s linear,-webkit-transform .3s linear}[data-widget=expandable-table][aria-expanded=true] i.expandable-table-caret[class*=right]{-webkit-transform:rotate(90deg);transform:rotate(90deg)}[data-widget=expandable-table][aria-expanded=true] i.expandable-table-caret[class*=left]{-webkit-transform:rotate(-90deg);transform:rotate(-90deg...

///

### What is "Mounting"

"Mounting" means adding a complete "independent" application in a specific path, that then takes care of handling all the sub-paths.

This is different from using an `APIRouter` as a mounted application is completely independent. The OpenAPI and docs from your main application won't include anything from the mounted application, etc.

From the list of deployment concepts from above, using workers would mainly help with the **replication** part, and a little bit with the **restarts**, but you still need to take care of the others:

* **Security - HTTPS**
* **Running on startup**
* ***Restarts***
* Replication (the number of processes running)
* **Memory**
* **Previous steps before starting**

And now, we can use `__init__` to declare the parameters of the instance that we can use to "parameterize" the dependency:

{* ../../docs_src/dependencies/tutorial011_an_py39.py hl[9] *}

In this case, **FastAPI** won't ever touch or care about `__init__`, we will use it directly in our code.

## Create an instance

We could create an instance of this class with:

{* ../../docs_src/dependencies/tutorial011_an_py39.py hl[18] *}