Official Go implementation of the Ethereum protocol
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go-ethereum/common/lru/lru.go

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// Copyright 2022 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package lru
import "sync"
// Cache is a LRU cache.
// This type is safe for concurrent use.
type Cache[K comparable, V any] struct {
cache BasicLRU[K, V]
mu sync.Mutex
}
// NewCache creates an LRU cache.
func NewCache[K comparable, V any](capacity int) *Cache[K, V] {
return &Cache[K, V]{cache: NewBasicLRU[K, V](capacity)}
}
// Add adds a value to the cache. Returns true if an item was evicted to store the new item.
func (c *Cache[K, V]) Add(key K, value V) (evicted bool) {
c.mu.Lock()
defer c.mu.Unlock()
return c.cache.Add(key, value)
}
// Contains reports whether the given key exists in the cache.
func (c *Cache[K, V]) Contains(key K) bool {
c.mu.Lock()
defer c.mu.Unlock()
return c.cache.Contains(key)
}
// Get retrieves a value from the cache. This marks the key as recently used.
func (c *Cache[K, V]) Get(key K) (value V, ok bool) {
c.mu.Lock()
defer c.mu.Unlock()
return c.cache.Get(key)
}
// Len returns the current number of items in the cache.
func (c *Cache[K, V]) Len() int {
c.mu.Lock()
defer c.mu.Unlock()
return c.cache.Len()
}
// Peek retrieves a value from the cache, but does not mark the key as recently used.
func (c *Cache[K, V]) Peek(key K) (value V, ok bool) {
c.mu.Lock()
defer c.mu.Unlock()
return c.cache.Peek(key)
}
// Purge empties the cache.
func (c *Cache[K, V]) Purge() {
c.mu.Lock()
defer c.mu.Unlock()
c.cache.Purge()
}
// Remove drops an item from the cache. Returns true if the key was present in cache.
func (c *Cache[K, V]) Remove(key K) bool {
c.mu.Lock()
defer c.mu.Unlock()
return c.cache.Remove(key)
}
// Keys returns all keys of items currently in the LRU.
func (c *Cache[K, V]) Keys() []K {
c.mu.Lock()
defer c.mu.Unlock()
return c.cache.Keys()
}