Enum Priority 

#[non_exhaustive]
pub enum Priority {
    Unspecified,
    Low,
    Medium,
    High,
    UnknownValue(UnknownValue),
}

The relative priority for requests. Note that priority isn’t applicable for BeginTransaction.

The priority acts as a hint to the Cloud Spanner scheduler and doesn’t guarantee priority or order of execution. For example:

• Some parts of a write operation always execute at PRIORITY_HIGH, regardless of the specified priority. This can cause you to see an increase in high priority workload even when executing a low priority request. This can also potentially cause a priority inversion where a lower priority request is fulfilled ahead of a higher priority request.
• If a transaction contains multiple operations with different priorities, Cloud Spanner doesn’t guarantee to process the higher priority operations first. There might be other constraints to satisfy, such as the order of operations.

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

PRIORITY_UNSPECIFIED is equivalent to PRIORITY_HIGH.

Low

This specifies that the request is low priority.

Medium

This specifies that the request is medium priority.

High

This specifies that the request is high priority.

UnknownValue(UnknownValue)

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

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

Implementations

impl Priority

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 Priority

fn clone(&self) -> Priority

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Priority

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

Formats the value using the given formatter.

impl Default for Priority

fn default() -> Self

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for Priority

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

where D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Display for Priority

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

Formats the value using the given formatter.

impl From<&str> for Priority

fn from(value: &str) -> Self

Converts to this type from the input type.

impl From<i32> for Priority

fn from(value: i32) -> Self

Converts to this type from the input type.

impl PartialEq for Priority

fn eq(&self, other: &Priority) -> 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 Priority

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 Priority