public interface Cache<K, V> {

  /**
   * Returns the value associated with {@code key} in this cache, or {@code null} if there is no
   * cached value for {@code key}.
   *
   * @since 11.0
   */
  @CheckForNull
  @CanIgnoreReturnValue // TODO(b/27479612): consider removing this?
  V getIfPresent(@CompatibleWith("K") Object key);

  /**

      T defaultConverter = (T) defaultConverter(convertFromType, convertToType);
      return defaultConverter;
    }
    if (type.getRawType().isInterface()) {
      return newDefaultReturningProxy(type);
    }
    return null;
  }

  private <F, T> Converter<F, T> defaultConverter(
      final TypeToken<F> convertFromType, final TypeToken<T> convertToType) {
    return new Converter<F, T>() {

      shutdown();
      return ImmutableList.of();
    }

    @Override
    public boolean isShutdown() {
      return shutdown;
    }

    @Override
    public boolean isTerminated() {
      return shutdown;
    }

    @Override
    public boolean awaitTermination(long timeout, TimeUnit unit) {
      return true;
    }

    @Override

    ArrayList<Throwable> temp = new ArrayList<>(Arrays.asList(exceptions));
    return create(temp);
  }

  /**
   * Given a collection of exceptions, returns a {@link RuntimeException}, with the following rules:
   *
   * <ul>
   *   <li>If {@code exceptions} has a single exception and that exception is a {@link
   *       RuntimeException}, return it

	}
}

func compressor(method uint16) Compressor {
	ci, ok := compressors.Load(method)
	if !ok {
		return nil
	}
	return ci.(Compressor)
}

func decompressor(method uint16) Decompressor {
	di, ok := decompressors.Load(method)
	if !ok {
		return nil
	}
	return di.(Decompressor)

	// For SignV2 - Signature field will be valid
	if _, ok := formValues[xhttp.AmzSignatureV2]; ok {
		return doesPolicySignatureV2Match(formValues)
	}
	return doesPolicySignatureV4Match(formValues)
}

// compareSignatureV4 returns true if and only if both signatures
// are equal. The signatures are expected to be HEX encoded strings
// according to the AWS S3 signature V4 spec.

		return false, "", errNoSuchUser
	}
	cred := u.Credentials
	if cred.IsTemp() {
		return true, cred.ParentUser, nil
	}

	return false, "", nil
}

// IsServiceAccount - returns if given key is a service account
func (sys *IAMSys) IsServiceAccount(name string) (bool, string, error) {
	if !sys.Initialized() {
		return false, "", errServerNotInitialized
	}

	u, found := sys.store.GetUser(name)
	if !found {

				err = msgp.WrapError(err, "Key")
				return
			}
		case "Context":
			z.Context, bts, err = msgp.ReadStringBytes(bts)
			if err != nil {
				err = msgp.WrapError(err, "Context")
				return
			}
		default:
			bts, err = msgp.Skip(bts)
			if err != nil {
				err = msgp.WrapError(err)
				return
			}
		}
	}
	o = bts
	return
}

		return nil
	}

	return objLayer
}

// ClusterCheckHandler returns if the server is ready for requests.
func ClusterCheckHandler(w http.ResponseWriter, r *http.Request) {
	ctx := newContext(r, w, "ClusterCheckHandler")

	objLayer := checkHealth(w)
	if objLayer == nil {
		return
	}

	ctx, cancel := context.WithTimeout(ctx, globalAPIConfig.getClusterDeadline())
	defer cancel()

		if err := tag.Validate(); err != nil {
			return err
		}
	}

	for _, meta := range ef.Metadata {
		if err := meta.Validate(); err != nil {
			return err
		}
	}
	if err := ef.Purge.Validate(); err != nil {
		return err
	}
	if err := ef.Size.Validate(); err != nil {
		return err
	}
	if ef.CreatedBefore != nil && !ef.CreatedBefore.Before(time.Now()) {
		return BatchJobYamlErr{
			line: ef.line,