Enum ConcurrencyMode 

#[non_exhaustive]
pub enum ConcurrencyMode {
    Unspecified,
    Optimistic,
    Pessimistic,
    OptimisticWithEntityGroups,
    UnknownValue(UnknownValue),
}

The type of concurrency control mode for transactions.

Working with unknown values

This enum is defined as #[non_exhaustive] because Google Cloud may add additional enum variants at any time. Adding new variants is not considered a breaking change. Applications should write their code in anticipation of:

• New values appearing in future releases of the client library, and
• New values received dynamically, without application changes.

Please consult the Working with enums section in the user guide for some guidelines.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Unspecified

Not used.

Optimistic

Use optimistic concurrency control by default. This mode is available for Cloud Firestore databases.

Pessimistic

Use pessimistic concurrency control by default. This mode is available for Cloud Firestore databases.

This is the default setting for Cloud Firestore.

OptimisticWithEntityGroups

Use optimistic concurrency control with entity groups by default.

This is the only available mode for Cloud Datastore.

This mode is also available for Cloud Firestore with Datastore Mode but is not recommended.

UnknownValue(UnknownValue)

If set, the enum was initialized with an unknown value.

Applications can examine the value using ConcurrencyMode::value or ConcurrencyMode::name.

Implementations

impl ConcurrencyMode

pub fn value(&self) -> Option<i32>

Gets the enum value.

Returns None if the enum contains an unknown value deserialized from the string representation of enums.

pub fn name(&self) -> Option<&str>

Gets the enum value as a string.

Returns None if the enum contains an unknown value deserialized from the integer representation of enums.

Trait Implementations

impl Clone for ConcurrencyMode

fn clone(&self) -> ConcurrencyMode

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ConcurrencyMode

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for ConcurrencyMode

fn default() -> Self

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for ConcurrencyMode

fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>

where D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Display for ConcurrencyMode

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl From<&str> for ConcurrencyMode

fn from(value: &str) -> Self

Converts to this type from the input type.

impl From<i32> for ConcurrencyMode

fn from(value: i32) -> Self

Converts to this type from the input type.

impl PartialEq for ConcurrencyMode

fn eq(&self, other: &ConcurrencyMode) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serialize for ConcurrencyMode

fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>

where S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for ConcurrencyMode