Struct wascc_actor::keyvalue::KeyValueStoreHostBinding

pub struct KeyValueStoreHostBinding { /* fields omitted */ }

An abstraction around a host runtime capability for a key-value store

Implementations

impl KeyValueStoreHostBinding

pub fn get(&self, key: &str) -> HandlerResult<Option<String>>

Obtains a single value from the store

pub fn set(
    &self,
    key: &str,
    value: &str,
    expires: Option<u32>
) -> HandlerResult<()>

Sets a value in the store

pub fn atomic_add(&self, key: &str, value: i32) -> HandlerResult<i32>

Performs an atomic increment operation

pub fn list_add(&self, key: &str, item: &str) -> HandlerResult<usize>

Adds an item to a list at the given key

pub fn list_del_item(&self, key: &str, item: &str) -> HandlerResult<usize>

Removes an item from the list at the given key

pub fn del_key(&self, key: &str) -> HandlerResult<()>

Removes the data associated with a given key, which can include lists or sets

pub fn list_range(
    &self,
    key: &str,
    start: isize,
    stop_inclusive: isize
) -> HandlerResult<Vec<String>>

Queries a given list-type key for a range of values

pub fn list_clear(&self, key: &str) -> HandlerResult<()>

Clears a list while leaving the key intact

pub fn set_add(&self, key: &str, value: &str) -> HandlerResult<usize>

Adds a value to a set at the given key

pub fn set_remove(&self, key: &str, value: &str) -> HandlerResult<usize>

Removes a value from the given set

pub fn set_union(&self, keys: Vec<String>) -> HandlerResult<Vec<String>>

Performs a union of sets specified by the list of keys

pub fn set_intersect(&self, keys: Vec<String>) -> HandlerResult<Vec<String>>

Performs the intersection of sets specified by the given keys

pub fn set_members(&self, key: &str) -> HandlerResult<Vec<String>>

Returns a list of members belonging to a given set

pub fn exists(&self, key: &str) -> HandlerResult<bool>

Indicates whether a key exists (not that empty lists/sets may return true for their existence if they were cleared instead of deleted)

Trait Implementations

impl Default for KeyValueStoreHostBinding

fn default() -> Self

Returns the "default value" for a type.