Trait ReadDisk

pub trait ReadDisk {
    // Required methods
    fn zs_is_empty<C>(&self, cf: &C) -> bool
       where C: AsColumnFamilyRef;
    fn zs_get<C, K, V>(&self, cf: &C, key: &K) -> Option<V>
       where C: AsColumnFamilyRef,
             K: IntoDisk,
             V: FromDisk;
    fn zs_contains<C, K>(&self, cf: &C, key: &K) -> bool
       where C: AsColumnFamilyRef,
             K: IntoDisk;
    fn zs_first_key_value<C, K, V>(&self, cf: &C) -> Option<(K, V)>
       where C: AsColumnFamilyRef,
             K: IntoDisk + FromDisk,
             V: FromDisk;
    fn zs_last_key_value<C, K, V>(&self, cf: &C) -> Option<(K, V)>
       where C: AsColumnFamilyRef,
             K: IntoDisk + FromDisk,
             V: FromDisk;
    fn zs_next_key_value_from<C, K, V>(
        &self,
        cf: &C,
        lower_bound: &K,
    ) -> Option<(K, V)>
       where C: AsColumnFamilyRef,
             K: IntoDisk + FromDisk,
             V: FromDisk;
    fn zs_next_key_value_strictly_after<C, K, V>(
        &self,
        cf: &C,
        lower_bound: &K,
    ) -> Option<(K, V)>
       where C: AsColumnFamilyRef,
             K: IntoDisk + FromDisk,
             V: FromDisk;
    fn zs_prev_key_value_back_from<C, K, V>(
        &self,
        cf: &C,
        upper_bound: &K,
    ) -> Option<(K, V)>
       where C: AsColumnFamilyRef,
             K: IntoDisk + FromDisk,
             V: FromDisk;
    fn zs_prev_key_value_strictly_before<C, K, V>(
        &self,
        cf: &C,
        upper_bound: &K,
    ) -> Option<(K, V)>
       where C: AsColumnFamilyRef,
             K: IntoDisk + FromDisk,
             V: FromDisk;
    fn zs_items_in_range_ordered<C, K, V, R>(
        &self,
        cf: &C,
        range: R,
    ) -> BTreeMap<K, V>
       where C: AsColumnFamilyRef,
             K: IntoDisk + FromDisk + Ord,
             V: FromDisk,
             R: RangeBounds<K>;
    fn zs_items_in_range_unordered<C, K, V, R>(
        &self,
        cf: &C,
        range: R,
    ) -> HashMap<K, V>
       where C: AsColumnFamilyRef,
             K: IntoDisk + FromDisk + Eq + Hash,
             V: FromDisk,
             R: RangeBounds<K>;
}

Helper trait for retrieving and deserializing values from rocksdb column families.

Deprecation

This trait should not be used in new code, use TypedColumnFamily instead.

Required Methods

fn zs_is_empty<C>(&self, cf: &C) -> bool

where C: AsColumnFamilyRef,

Returns true if a rocksdb column family cf does not contain any entries.

fn zs_get<C, K, V>(&self, cf: &C, key: &K) -> Option<V>

where C: AsColumnFamilyRef, K: IntoDisk, V: FromDisk,

Returns the value for key in the rocksdb column family cf, if present.

fn zs_contains<C, K>(&self, cf: &C, key: &K) -> bool

where C: AsColumnFamilyRef, K: IntoDisk,

Check if a rocksdb column family cf contains the serialized form of key.

fn zs_first_key_value<C, K, V>(&self, cf: &C) -> Option<(K, V)>

where C: AsColumnFamilyRef, K: IntoDisk + FromDisk, V: FromDisk,

Returns the lowest key in cf, and the corresponding value.

Returns None if the column family is empty.

fn zs_last_key_value<C, K, V>(&self, cf: &C) -> Option<(K, V)>

where C: AsColumnFamilyRef, K: IntoDisk + FromDisk, V: FromDisk,

Returns the highest key in cf, and the corresponding value.

Returns None if the column family is empty.

fn zs_next_key_value_from<C, K, V>( &self, cf: &C, lower_bound: &K, ) -> Option<(K, V)>

where C: AsColumnFamilyRef, K: IntoDisk + FromDisk, V: FromDisk,

Returns the first key greater than or equal to lower_bound in cf, and the corresponding value.

Returns None if there are no keys greater than or equal to lower_bound.

fn zs_next_key_value_strictly_after<C, K, V>( &self, cf: &C, lower_bound: &K, ) -> Option<(K, V)>

where C: AsColumnFamilyRef, K: IntoDisk + FromDisk, V: FromDisk,

Returns the first key strictly greater than lower_bound in cf, and the corresponding value.

Returns None if there are no keys greater than lower_bound.

fn zs_prev_key_value_back_from<C, K, V>( &self, cf: &C, upper_bound: &K, ) -> Option<(K, V)>

where C: AsColumnFamilyRef, K: IntoDisk + FromDisk, V: FromDisk,

Returns the first key less than or equal to upper_bound in cf, and the corresponding value.

Returns None if there are no keys less than or equal to upper_bound.

fn zs_prev_key_value_strictly_before<C, K, V>( &self, cf: &C, upper_bound: &K, ) -> Option<(K, V)>

where C: AsColumnFamilyRef, K: IntoDisk + FromDisk, V: FromDisk,

Returns the first key strictly less than upper_bound in cf, and the corresponding value.

Returns None if there are no keys less than upper_bound.

fn zs_items_in_range_ordered<C, K, V, R>( &self, cf: &C, range: R, ) -> BTreeMap<K, V>

where C: AsColumnFamilyRef, K: IntoDisk + FromDisk + Ord, V: FromDisk, R: RangeBounds<K>,

Returns the keys and values in cf in range, in an ordered BTreeMap.

Holding this iterator open might delay block commit transactions.

fn zs_items_in_range_unordered<C, K, V, R>( &self, cf: &C, range: R, ) -> HashMap<K, V>

where C: AsColumnFamilyRef, K: IntoDisk + FromDisk + Eq + Hash, V: FromDisk, R: RangeBounds<K>,

Returns the keys and values in cf in range, in an unordered HashMap.

Holding this iterator open might delay block commit transactions.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementors

impl ReadDisk for DiskDb

Deprecation

These impls should not be used in new code, use TypedColumnFamily instead.