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

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

{* ../../docs_src/dependencies/tutorial011_an_py39.py hl[12] *}

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

package cachevalue

import (
	"context"
	"errors"
	"testing"
	"time"
)

func slowCaller(ctx context.Context) error {
	sl := time.NewTimer(time.Second)
	defer sl.Stop()

	select {
	case <-sl.C:
	case <-ctx.Done():
		return ctx.Err()
	}

	return nil
}

func TestCacheCtx(t *testing.T) {
	cache := New[time.Time]()
	t.Parallel()
	cache.InitOnce(2*time.Second, Opts{},

final class ImmutableEnumMap<K extends Enum<K>, V> extends IteratorBasedImmutableMap<K, V> {
  static <K extends Enum<K>, V> ImmutableMap<K, V> asImmutable(EnumMap<K, V> map) {
    switch (map.size()) {
      case 0:
        return ImmutableMap.of();
      case 1:
        Entry<K, V> entry = getOnlyElement(map.entrySet());
        return ImmutableMap.of(entry.getKey(), entry.getValue());
      default:
        return new ImmutableEnumMap<>(map);
    }

     * whether the DependencyCoordinates is used in dependency management, in which case it means the scope is not
     * explicitly managed by this managed dependency, or as a real dependency, in which case, the scope
     * will default to {@link #COMPILE}.
     */
    UNDEFINED("", false),

    /**
     * Compile only.
     */

	}
}

// Get gets a []byte from the BytePool, or creates a new one if none are
// available in the pool.
func (bp *BytePoolCap) Get() (b []byte) {
	if bp == nil {
		return nil
	}
	select {
	case b = <-bp.c:
		// reuse existing buffer
	default:
		// create new aligned buffer
		b = reedsolomon.AllocAligned(1, bp.wcap)[0][:bp.w]
	}
	return
}

// Put returns the given Buffer to the BytePool.

        String[] parts = coords.split(":");
        switch (parts.length) {
            case 3:
                s = new DefaultArtifact(parts[0], parts[1], "*", "*", parts[2]);
                break;
            case 4:
                s = new DefaultArtifact(parts[0], parts[1], "*", parts[2], parts[3]);
                break;
            case 5:
                s = new DefaultArtifact(parts[0], parts[1], parts[2], parts[3], parts[4]);

	}
	consumed = int(dirent.Reclen)
	if direntInode(dirent) == 0 { // File absent in directory.
		return
	}
	switch dirent.Type {
	case syscall.DT_REG:
		typ = 0
	case syscall.DT_DIR:
		typ = os.ModeDir
	case syscall.DT_LNK:
		typ = os.ModeSymlink
	default:
		// Skip all other file types. Revisit if/when this code needs
		// to handle such files, MinIO is only interested in

		}, r.URL)
	case strings.HasPrefix(r.URL.Path, adminPathPrefix):
		var desc string
		version := extractAPIVersion(r)
		switch version {
		case "v1", madmin.AdminAPIVersionV2:
			desc = fmt.Sprintf("Server expects client requests with 'admin' API version '%s', found '%s', please upgrade the client to latest releases", madmin.AdminAPIVersion, version)
		case madmin.AdminAPIVersion:

		return err
	}

	switch serverSupportStatus {
	case ESSUnknown:
		return errors.New("unable to determine support status of ES (should not happen)")

	case ESSDeprecated:
		return errors.New("there is no currently deprecated version of ES in MinIO")

	case ESSSupported:
		target.client = clientV7

	default:
		// ESSUnsupported case

        switch (getFormatType(request)) {
        case SEARCH:
            processSearchRequest(request, response, chain);
            break;
        case LABEL:
            processLabelRequest(request, response, chain);
            break;
        case POPULARWORD:
            processPopularWordRequest(request, response, chain);
            break;
        case FAVORITE: