Struct tikv::storage::txn::commands::RawCompareAndSwap

pub struct RawCompareAndSwap {
    pub ctx: Context,
    pub cf: CfName,
    pub key: Key,
    pub previous_value: Option<Value>,
    pub value: Value,
    pub ttl: Option<u64>,
}

RawCompareAndSwap checks whether the previous value of the key equals to the given value. If they are equal, write the new value. The bool indicates whether they are equal. The previous value is always returned regardless of whether the new value is set.

Fields

ctx: Context

cf: CfName

key: Key

previous_value: Option<Value>

value: Value

ttl: Option<u64>

Implementations

impl RawCompareAndSwap

pub fn new(
    cf: CfName,
    key: Key,
    previous_value: Option<Value>,
    value: Value,
    ttl: Option<u64>,
    ctx: Context
) -> TypedCommand<(Option<Value>, bool)>

Return a TypedCommand that encapsulates the result of executing this command.

Trait Implementations

impl CommandExt for RawCompareAndSwap

fn get_ctx(&self) -> &Context

fn get_ctx_mut(&mut self) -> &mut Context

fn tag(&self) -> CommandKind

fn incr_cmd_metric(&self)

fn gen_lock(&self) -> Lock

fn write_bytes(&self) -> usize

fn ts(&self) -> TimeStamp

fn readonly(&self) -> bool

fn is_sys_cmd(&self) -> bool

fn can_be_pipelined(&self) -> bool

impl Debug for RawCompareAndSwap

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

Formats the value using the given formatter.

impl Display for RawCompareAndSwap

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

Formats the value using the given formatter.

impl<S: Snapshot, L: LockManager> WriteCommand<S, L> for RawCompareAndSwap

fn process_write(
    self,
    snapshot: S,
    _: WriteContext<'_, L>
) -> Result<WriteResult>