*/
    String getDomainTitle();

    /**
     * Get the value for the key 'search_engine.type'. <br>
     * The value is, e.g. default <br>
     * comment: The type of search engine backend (e.g., default, opensearch).
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getSearchEngineType();

### Declare the dependency, in the "dependant" { #declare-the-dependency-in-the-dependant }

The same way you use `Body`, `Query`, etc. with your *path operation function* parameters, use `Depends` with a new parameter:

{* ../../docs_src/dependencies/tutorial001_an_py310.py hl[13,18] *}

Although you use `Depends` in the parameters of your function the same way you use `Body`, `Query`, etc, `Depends` works a bit differently.

The process normally is that **you define** in your code what is the message that you will send, the **body of the request**.

You also define in some way at which **moments** your app will send those requests or events.

And **your users** define in some way (for example in a web dashboard somewhere) the **URL** where your app should send those requests.

tB,KAAOkC,EAC5CmrB,EAAW5L,EAASzd,IAAKspB,EAAYzF,GAAiB,EAEjDwF,EAQL5L,EAASJ,IAAKiM,EAAYzF,EAAcwF,IAPnCztB,EAASutB,aACbntB,KAAK4f,oBAAqBiI,EAAcqF,GAExChrB,EAAI0d,oBAAqBje,EAAMurB,GAAoB,GAEpDzL,EAASlF,OAAQ+Q,EAAYzF,QAgBjC5kB,GAAOsB,KAAM,CACZgpB,WAAY,YACZC,WAAY,WACZC,aAAc,cACdC,aAAc,cACZ,SAAUC,EAAMlE,GAClBxmB,GAAOskB,MAAMxJ,QAAS4P,GAAS,CAC9B9F,aAAc4B,EACdT,SAAUS,EAEVZ,OAAQ,SAAUtB,GACjB,IAAInjB,EAEHwpB,EAAUrG,EAAMyD,cAChBzC,EAAYhB,EAAMgB,UASnB,OALMqF,IAAaA,IANT5tB,MAMgCiD,GAAOwF,SANvCzI,KAMyD4tB,MACl...

But we want to be able to parameterize that fixed content.

## A "callable" instance { #a-callable-instance }

In Python there's a way to make an instance of a class a "callable".

Not the class itself (which is already a callable), but an instance of that class.

To do that, we declare a method `__call__`:

And of course, it supports the same:

* data validation
* data serialization
* data documentation, etc.

This works the same way as with Pydantic models. And it is actually achieved in the same way underneath, using Pydantic.

/// info

Keep in mind that dataclasses can't do everything Pydantic models can do.

So, you might still need to use Pydantic models.

 *       <a href="https://developer.android.com/studio/build/shrink-code">R8 and Proguard</a>.
 *   <li>It doesn't offer a way to wait for multiple events before taking action. For example, it
 *       doesn't offer a way to wait for multiple producers to all report that they're "ready," nor
 *       does it offer a way to batch multiple events from a single producer together.
 *   <li>It doesn't support backpressure and other features needed for resilience.

</blockquote>

## Investigation { #investigation }

By using all the previous alternatives I had the chance to learn from all of them, take ideas, and combine them in the best way I could find for myself and the teams of developers I have worked with.

So, you can look for that specific exception inside the dependency with `except SomeException`.

In the same way, you can use `finally` to make sure the exit steps are executed, no matter if there was an exception or not.

{* ../../docs_src/dependencies/tutorial007.py hl[3,5] *}

This means entire plugins can be enabled and disabled without having to manually edit individual extension point settings.
These extension points can now be abstracted away due to their irrelevance for most users.

### CSI Migration updates