In this case, this `__call__` is what **FastAPI** will use to check for additional parameters and sub-dependencies, and this is what will be called to pass a value to the parameter in your *path operation function* later.

## Parameterize the instance { #parameterize-the-instance }

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

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
package jcifs.internal.smb2.rdma;

/**
 * RDMA negotiation response parameters.
 *
 * Contains the negotiated parameters returned by the RDMA peer
 * during connection establishment.
 */
public class RdmaNegotiateResponse {

    private int status;
    private int selectedVersion;

            }
            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
        }
    }

        return "WebAuthentication [webConfig=" + webConfig + ", authRealm=" + authRealm + ", createdBy=" + createdBy + ", createdTime="
                + createdTime + ", hostname=" + hostname + ", parameters=" + parameters + ", port=" + port + ", protocolScheme="
                + protocolScheme + ", updatedBy=" + updatedBy + ", updatedTime=" + updatedTime + ", username=" + username + ", webConfigId="

 * .compare(a.foo, b.bar)}. {@code ComparisonChain} also has a potential performance problem that
 * {@code Comparator} doesn't: it evaluates all the parameters of all the {@code .compare} calls,
 * even when the result of the comparison is already known from previous {@code .compare} calls.
 * That can be expensive.
 *
 * @author Mark Davis
 * @author Kevin Bourrillion

# FastAPI doesn't currently support non-scalar Path parameters...

        return null;
    }

    /**
     * Gets the sort prefix used for identifying sort parameters in search queries.
     *
     * @return the sortPrefix
     */
    public String getSortPrefix() {
        return sortPrefix;
    }

    /**
     * Sets the sort prefix used for identifying sort parameters in search queries.
     *
     * @param sortPrefix the sortPrefix to set
     */

        netServerEnum2 = new NetServerEnum2(realConfig, domain, NetServerEnum2.SV_TYPE_ALL);

        // Test with very small buffer
        byte[] dst = new byte[10]; // Too small for the full parameters

        // Should throw ArrayIndexOutOfBoundsException
        assertThrows(ArrayIndexOutOfBoundsException.class, () -> {
            netServerEnum2.writeParametersWireFormat(dst, 0);
        });
    }

    /**
     * Handles the help page request and renders the help interface.
     * This method performs authentication checks and sets up the necessary
     * form parameters and rendering data for the help page display.
     *
     * @return HtmlResponse containing the rendered help page or redirect to login if authentication is required
     */
    @Execute
    public HtmlResponse index() {

In this example above, the input model is a Pydantic v1 model, and the output model (defined in `response_model=ItemV2`) is a Pydantic v2 model.

### Pydantic v1 parameters { #pydantic-v1-parameters }

If you need to use some of the FastAPI-specific tools for parameters like `Body`, `Query`, `Form`, etc. with Pydantic v1 models, you can import them from `fastapi.temp_pydantic_v1_params` while you finish the migration to Pydantic v2: