* (e.g., "windows", "unix", "mac").
     *
     * @return the operating system family name (never null)
     */
    @Nonnull
    String family();

    /**
     * Checks if the current operating system belongs to the Windows family.
     * This includes all Windows variants (95, 98, ME, NT, 2000, XP, Vista, 7, 8, 10, 11).
     *

    clearCache();
    backingMap.clear();
  }

  @Nullable V get(Object key) {
    checkNotNull(key);
    V value = getIfCached(key);
    // TODO(b/192579700): Use a ternary once it no longer confuses our nullness checker.
    if (value == null) {
      return getWithoutCaching(key);
    } else {
      return value;
    }
  }

  final @Nullable V getWithoutCaching(Object key) {
    checkNotNull(key);

     */
    @Override
    public void saveSession(final String sessionId) {
        // TODO use cache
    }

    /**
     * Checks if a URL has been visited by looking in both the queue and access results.
     *
     * @param urlQueue The URL queue entry to check.
     * @return true if the URL has been visited, false otherwise.
     */
    @Override
    public boolean visited(final OpenSearchUrlQueue urlQueue) {

		if err != nil {
			return nil, errAuthentication
		}
	}

	// If AuthZPlugin is set, return without any further checks.
	if newGlobalAuthZPluginFn() != nil {
		return claims, nil
	}

	// Check if a session policy is set. If so, decode it here.
	sp, spok := claims.Lookup(policy.SessionPolicyName)
	if spok {
		// Looks like subpolicy is set and is a string, if set then its

            errorPoms.addAll(pomMap.keySet());
        }

        return new UpgradeResult(processedPoms, modifiedPoms, errorPoms);
    }

    /**
     * Upgrades plugins in the document.
     * Checks both build/plugins and build/pluginManagement/plugins sections.
     * Only processes plugins explicitly defined in the current POM document.
     */

	return ok && !strings.EqualFold(h.Get(xhttp.AmzServerSideEncryption), xhttp.AmzEncryptionKMS)
}

// ParseHTTP parses the SSE-S3 related HTTP headers and checks
// whether they contain valid values.
func (sses3) ParseHTTP(h http.Header) error {
	if h.Get(xhttp.AmzServerSideEncryption) != xhttp.AmzEncryptionAES {
		return ErrInvalidEncryptionMethod
	}
	return nil
}

            values[field.name] = v_
    return values, errors


def is_union_of_base_models(field_type: Any) -> bool:
    """Check if field type is a Union where all members are BaseModel subclasses."""
    from fastapi.types import UnionType

    origin = get_origin(field_type)

    # Check if it's a Union type (covers both typing.Union and types.UnionType in Python 3.10+)
    if origin is not Union and origin is not UnionType:

func (v Value) ToArray() (val []Value, ok bool) {
	val, ok = v.value.([]Value)
	return val, ok
}

// IsNull - checks if value is missing.
func (v Value) IsNull() bool {
	//nolint:gocritic
	switch v.value.(type) {
	case nil:
		return true
	}
	return false
}

// IsMissing - checks if value is missing.
func (v Value) IsMissing() bool {
	_, ok := v.value.(Missing)
	return ok
}

For the error, we use the exception `HTTPException`:

{* ../../docs_src/security/tutorial003_an_py310.py hl[3,79:81] *}

### Check the password { #check-the-password }

At this point we have the user data from our database, but we haven't checked the password.

Let's put that data in the Pydantic `UserInDB` model first.

    private boolean initialized = false;

    @Override
    public boolean isAvailable() {
        try {
            // Check if DiSNI is available on the classpath
            Class.forName("com.ibm.disni.RdmaActiveEndpointGroup");

            // Additional checks could include:
            // - Verifying RDMA devices are available
            // - Testing basic RDMA operations