datafusion_execution/cache/
mod.rs

1// Licensed to the Apache Software Foundation (ASF) under one
2// or more contributor license agreements.  See the NOTICE file
3// distributed with this work for additional information
4// regarding copyright ownership.  The ASF licenses this file
5// to you under the Apache License, Version 2.0 (the
6// "License"); you may not use this file except in compliance
7// with the License.  You may obtain a copy of the License at
8//
9//   http://www.apache.org/licenses/LICENSE-2.0
10//
11// Unless required by applicable law or agreed to in writing,
12// software distributed under the License is distributed on an
13// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
14// KIND, either express or implied.  See the License for the
15// specific language governing permissions and limitations
16// under the License.
17
18pub mod cache_manager;
19pub mod cache_unit;
20pub mod lru_queue;
21
22/// The cache accessor, users usually working on this interface while manipulating caches.
23/// This interface does not get `mut` references and thus has to handle its own
24/// locking via internal mutability. It can be accessed via multiple concurrent queries
25/// during planning and execution.
26pub trait CacheAccessor<K, V>: Send + Sync {
27    // Extra info but not part of the cache key or cache value.
28    type Extra: Clone;
29
30    /// Get value from cache.
31    fn get(&self, k: &K) -> Option<V>;
32    /// Get value from cache.
33    fn get_with_extra(&self, k: &K, e: &Self::Extra) -> Option<V>;
34    /// Put value into cache. Returns the old value associated with the key if there was one.
35    fn put(&self, key: &K, value: V) -> Option<V>;
36    /// Put value into cache. Returns the old value associated with the key if there was one.
37    fn put_with_extra(&self, key: &K, value: V, e: &Self::Extra) -> Option<V>;
38    /// Remove an entry from the cache, returning value if they existed in the map.
39    fn remove(&mut self, k: &K) -> Option<V>;
40    /// Check if the cache contains a specific key.
41    fn contains_key(&self, k: &K) -> bool;
42    /// Fetch the total number of cache entries.
43    fn len(&self) -> usize;
44    /// Check if the Cache collection is empty or not.
45    fn is_empty(&self) -> bool {
46        self.len() == 0
47    }
48    /// Remove all entries from the cache.
49    fn clear(&self);
50    /// Return the cache name.
51    fn name(&self) -> String;
52}
datafusion_execution/cache/mod.rs

datafusion_execution/cache/
mod.rs
