// If this CAS succeeds, we know that the provided callable will never be invoked,
            // so when oldFuture completes it is safe to allow the next submitted task to
            // proceed. Doing this immediately here lets the next task run without waiting for
            // the cancelled task's executor to run the noop AsyncCallable.
            //
            // ---
            //

## An app with callbacks

Let's see all this with an example.

Imagine you develop an app that allows creating invoices.

These invoices will have an `id`, `title` (optional), `customer`, and `total`.

The user of your API (an external developer) will create an invoice in your API with a POST request.

Then your API will (let's imagine):

**FastAPI** provides several tools to help you deal with **Security** easily, rapidly, in a standard way, without having to study and learn all the security specifications.

But first, let's check some small concepts.

## In a hurry?

If you don't care about any of these terms and you just need to add security with authentication based on username and password *right now*, skip to the next chapters.

airgapped environments), download the binary from <https://dl.min.io> and replace the existing MinIO binary let's say for example `/opt/bin/minio`, apply executable permissions `chmod +x /opt/bin/minio` and proceed to perform `mc admin service restart alias/`.

- For installations using Systemd MinIO service, upgrade via RPM/DEB packages **parallelly** on all servers or replace the binary lets say `/opt/bin/minio` on all nodes, apply executable permissions `chmod +x /opt/bin/minio` and process...

                val nonStaticScope = FirNoClassifiersScope(getBaseUseSiteScope())
                getStaticScope()
                    ?.let { staticScope -> FirNameAwareCompositeScope(listOf(nonStaticScope, staticScope)) }
                    ?: nonStaticScope
            }
        }

        val cacheKey = when (kind) {

                    .let(::FqName)
            }
        }
    }

    private fun collectTypeReferences(qualified: KtUserType): MutableList<KtNameReferenceExpression> {
        val refs = mutableListOf<KtNameReferenceExpression>()
        fun collectFragments(type: KtUserType) {
            type.getStubOrPsiChild(KtStubElementTypes.USER_TYPE)?.let { collectFragments(it) }

        return testCompileSourceRoots;
    }

    // TODO let the scope handler deal with this
    private static boolean isCompilePathElement(final String scope) {
        return Artifact.SCOPE_COMPILE.equals(scope)
                || Artifact.SCOPE_PROVIDED.equals(scope)
                || Artifact.SCOPE_SYSTEM.equals(scope);
    }

    // TODO let the scope handler deal with this

        @OptIn(UnresolvedExpressionTypeAccess::class)
        withClassEntry("coneTypeOrNull", annotation.coneTypeOrNull)
        @OptIn(UnsafeExpressionUtility::class)
        annotation.toReferenceUnsafe()?.let { withClassEntry("calleeReference", it) }
    }

    return annotation.argumentMapping.mapping.mapKeys { (name, _) -> name }
}

internal fun annotationsByClassId(
    firSymbol: FirBasedSymbol<*>,

Now you can translate it all and see how it looks as you save the file.

#### New Language

Let's say that you want to add translations for a language that is not yet translated, not even some pages.

Let's say you want to add translations for Creole, and it's not yet there in the docs.

Checking the link from above, the code for "Creole" is `ht`.

 * @param {Object} input - The object to investigate
 * @returns Object - The specified value if non-null, otherwise an empty array
 * @example {{ readField('jvm', 'files') | nullToEmpty }}
 */
function nullToEmpty(input) {
    let output;
    if (input) {
        output = input;
    } else {
        output = [];
    }
    console.log("nullToEmpty: " + output);
    return output;
}