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-rw-r--r--src/table/crdt/map.rs99
1 files changed, 0 insertions, 99 deletions
diff --git a/src/table/crdt/map.rs b/src/table/crdt/map.rs
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index 7553cd50..00000000
--- a/src/table/crdt/map.rs
+++ /dev/null
@@ -1,99 +0,0 @@
-use serde::{Deserialize, Serialize};
-
-use crate::crdt::crdt::*;
-
-/// Simple CRDT Map
-///
-/// This types defines a CRDT for a map from keys to values. Values are CRDT types which
-/// can have their own updating logic.
-///
-/// Internally, the map is stored as a vector of keys and values, sorted by ascending key order.
-/// This is why the key type `K` must implement `Ord` (and also to ensure a unique serialization,
-/// such that two values can be compared for equality based on their hashes). As a consequence,
-/// insertions take `O(n)` time. This means that Map should be used for reasonably small maps.
-/// However, note that even if we were using a more efficient data structure such as a `BTreeMap`,
-/// the serialization cost `O(n)` would still have to be paid at each modification, so we are
-/// actually not losing anything here.
-#[derive(Clone, Debug, Serialize, Deserialize, PartialEq)]
-pub struct Map<K, V> {
- vals: Vec<(K, V)>,
-}
-
-impl<K, V> Map<K, V>
-where
- K: Clone + Ord,
- V: Clone + Crdt,
-{
- /// Create a new empty map CRDT
- pub fn new() -> Self {
- Self { vals: vec![] }
- }
-
- /// Returns a map that contains a single mapping from the specified key to the specified value.
- /// This can be used to build a delta-mutator:
- /// when merged with another map, the value will be added or CRDT-merged if a previous
- /// value already exists.
- pub fn put_mutator(k: K, v: V) -> Self {
- Self { vals: vec![(k, v)] }
- }
-
- /// Add a value to the map
- pub fn put(&mut self, k: K, v: V) {
- self.merge(&Self::put_mutator(k, v));
- }
-
- /// Removes all values from the map
- pub fn clear(&mut self) {
- self.vals.clear();
- }
-
- /// Get a reference to the value assigned to a key
- pub fn get(&self, k: &K) -> Option<&V> {
- match self.vals.binary_search_by(|(k2, _)| k2.cmp(k)) {
- Ok(i) => Some(&self.vals[i].1),
- Err(_) => None,
- }
- }
- /// Gets a reference to all of the items, as a slice. Usefull to iterate on all map values.
- pub fn items(&self) -> &[(K, V)] {
- &self.vals[..]
- }
- /// Returns the number of items in the map
- pub fn len(&self) -> usize {
- self.vals.len()
- }
-
- /// Returns true if the map is empty
- pub fn is_empty(&self) -> bool {
- self.len() == 0
- }
-}
-
-impl<K, V> Crdt for Map<K, V>
-where
- K: Clone + Ord,
- V: Clone + Crdt,
-{
- fn merge(&mut self, other: &Self) {
- for (k, v2) in other.vals.iter() {
- match self.vals.binary_search_by(|(k2, _)| k2.cmp(k)) {
- Ok(i) => {
- self.vals[i].1.merge(v2);
- }
- Err(i) => {
- self.vals.insert(i, (k.clone(), v2.clone()));
- }
- }
- }
- }
-}
-
-impl<K, V> Default for Map<K, V>
-where
- K: Clone + Ord,
- V: Clone + Crdt,
-{
- fn default() -> Self {
- Self::new()
- }
-}