import java.io.IOException;
import java.util.Collection;
import java.util.Map;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
import org.junit.runners.Parameterized.Parameters;

import jcifs.dcerpc.DcerpcException;
import jcifs.dcerpc.DcerpcHandle;
import jcifs.dcerpc.msrpc.LsaPolicyHandle;
import jcifs.dcerpc.msrpc.MsrpcLookupSids;
import jcifs.dcerpc.msrpc.MsrpcShareEnum;

    ```

    as it will use that `None` as the default value, and that way make the parameter **not required**.

    The `Union[str, None]` part allows your editor to provide better support, but it is not what tells FastAPI that this parameter is not required.

Then, we can pass more parameters to `Query`. In this case, the `max_length` parameter that applies to strings:

```Python

                    severity = null,
                    className = diagnostic.getHLDiagnosticClassName(),
                    implClassName = diagnostic.getHLDiagnosticImplClassName(),
                    parameters = diagnostic.parameters.mapIndexed(::convertParameter)
                )
            )
            is DeprecationDiagnosticData -> listOf(Severity.ERROR, Severity.WARNING).map {
                HLDiagnostic(

接收到新的请求时，**FastAPI** 执行如下操作：

* 用正确的参数调用依赖项函数（「可依赖项」）
* 获取函数返回的结果
* 把函数返回的结果赋值给*路径操作函数*的参数

```mermaid
graph TB

common_parameters(["common_parameters"])
read_items["/items/"]
read_users["/users/"]

common_parameters --> read_items
common_parameters --> read_users
```

这样，只编写一次代码，**FastAPI** 就可以为多个*路径操作*共享这段代码 。

!!! check "检查"

    注意，无需创建专门的类，并将之传递给 **FastAPI** 以进行「注册」或执行类似的操作。

            }
            logger.lifecycle("Cleaning up caches...")
            val homeDir = parameters.homeDir.get()

            homeDir.asFile.listFiles()?.filter { it.name.startsWith("distributions-") }?.forEach {
                val workerDir = homeDir.dir(it.name)
                cleanupDistributionCaches(workerDir, GradleVersion.version(parameters.gradleVersion.get()))
            }
            hasCleaned = true
        }
    }

import java.io.IOException;
import java.util.Collection;
import java.util.Map;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
import org.junit.runners.Parameterized.Parameters;

import jcifs.smb.SID;


/**
 * @author mbechler
 *
 */
@RunWith ( Parameterized.class )
@SuppressWarnings ( "javadoc" )
public class SidTest extends BaseCIFSTest {

    /**

    }
  }

  private static final class TypeSignature {
    final List<TypeParameterSignature> parameterSignatures;

    TypeSignature(TypeVariable<Method>[] parameters) {
      parameterSignatures =
          transform(
              Arrays.asList(parameters),
              new Function<TypeVariable<?>, TypeParameterSignature>() {
                @Override
                public TypeParameterSignature apply(TypeVariable<?> from) {

    }
  }

  private static final class TypeSignature {
    final List<TypeParameterSignature> parameterSignatures;

    TypeSignature(TypeVariable<Method>[] parameters) {
      parameterSignatures =
          transform(
              Arrays.asList(parameters),
              new Function<TypeVariable<?>, TypeParameterSignature>() {
                @Override
                public TypeParameterSignature apply(TypeVariable<?> from) {

    } ?: throw IllegalArgumentException("No such suite: $javaName")
  }
}

suspend fun fetchIanaSuites(okHttpClient: OkHttpClient): IanaSuites {
  val url = "https://www.iana.org/assignments/tls-parameters/tls-parameters-4.csv"

  val call = okHttpClient.newCall(Request(url.toHttpUrl()))

  val suites =
    call.executeAsync().use {
      if (!it.isSuccessful) {
        throw IOException("Failed ${it.code} ${it.message}")

            return;
        }

        mojoDescriptor.getParameters().stream()
                .filter(parameter -> !parameter.isEditable())
                .forEach(parameter -> checkParameter(
                        mavenSession, mojoDescriptor, mojoClass, parameter, pomConfiguration, expressionEvaluator));
    }

    private void checkParameter(
            MavenSession mavenSession,