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// Copyright 2024 The Hugo Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package maps
import "sync"
// Cache is a simple thread safe cache backed by a map.
type Cache[K comparable, T any] struct {
m map[K]T
sync.RWMutex
}
// NewCache creates a new Cache.
func NewCache[K comparable, T any]() *Cache[K, T] {
return &Cache[K, T]{m: make(map[K]T)}
}
// Delete deletes the given key from the cache.
func (c *Cache[K, T]) Get(key K) (T, bool) {
c.RLock()
v, found := c.m[key]
c.RUnlock()
return v, found
}
// GetOrCreate gets the value for the given key if it exists, or creates it if not.
func (c *Cache[K, T]) GetOrCreate(key K, create func() T) T {
c.RLock()
v, found := c.m[key]
c.RUnlock()
if found {
return v
}
c.Lock()
defer c.Unlock()
v, found = c.m[key]
if found {
return v
}
v = create()
c.m[key] = v
return v
}
// Set sets the given key to the given value.
func (c *Cache[K, T]) Set(key K, value T) {
c.Lock()
c.m[key] = value
c.Unlock()
}
// SliceCache is a simple thread safe cache backed by a map.
type SliceCache[T any] struct {
m map[string][]T
sync.RWMutex
}
func NewSliceCache[T any]() *SliceCache[T] {
return &SliceCache[T]{m: make(map[string][]T)}
}
func (c *SliceCache[T]) Get(key string) ([]T, bool) {
c.RLock()
v, found := c.m[key]
c.RUnlock()
return v, found
}
func (c *SliceCache[T]) Append(key string, values ...T) {
c.Lock()
c.m[key] = append(c.m[key], values...)
c.Unlock()
}
func (c *SliceCache[T]) Reset() {
c.Lock()
c.m = make(map[string][]T)
c.Unlock()
}
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