mirror of
https://github.com/gohugoio/hugo.git
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124 lines
2.6 KiB
Go
124 lines
2.6 KiB
Go
// Copyright 2024 The Hugo Authors. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package maps
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import "sync"
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// Cache is a simple thread safe cache backed by a map.
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type Cache[K comparable, T any] struct {
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m map[K]T
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sync.RWMutex
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}
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// NewCache creates a new Cache.
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func NewCache[K comparable, T any]() *Cache[K, T] {
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return &Cache[K, T]{m: make(map[K]T)}
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}
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// Delete deletes the given key from the cache.
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// If c is nil, this method is a no-op.
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func (c *Cache[K, T]) Get(key K) (T, bool) {
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if c == nil {
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var zero T
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return zero, false
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}
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c.RLock()
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v, found := c.m[key]
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c.RUnlock()
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return v, found
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}
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// GetOrCreate gets the value for the given key if it exists, or creates it if not.
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func (c *Cache[K, T]) GetOrCreate(key K, create func() T) T {
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c.RLock()
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v, found := c.m[key]
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c.RUnlock()
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if found {
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return v
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}
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c.Lock()
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defer c.Unlock()
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v, found = c.m[key]
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if found {
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return v
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}
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v = create()
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c.m[key] = v
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return v
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}
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// Set sets the given key to the given value.
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func (c *Cache[K, T]) Set(key K, value T) {
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c.Lock()
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c.m[key] = value
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c.Unlock()
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}
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// ForEeach calls the given function for each key/value pair in the cache.
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func (c *Cache[K, T]) ForEeach(f func(K, T)) {
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c.RLock()
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defer c.RUnlock()
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for k, v := range c.m {
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f(k, v)
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}
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}
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func (c *Cache[K, T]) Drain() map[K]T {
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c.Lock()
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m := c.m
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c.m = make(map[K]T)
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c.Unlock()
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return m
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}
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func (c *Cache[K, T]) Len() int {
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c.RLock()
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defer c.RUnlock()
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return len(c.m)
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}
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func (c *Cache[K, T]) Reset() {
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c.Lock()
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c.m = make(map[K]T)
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c.Unlock()
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}
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// SliceCache is a simple thread safe cache backed by a map.
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type SliceCache[T any] struct {
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m map[string][]T
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sync.RWMutex
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}
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func NewSliceCache[T any]() *SliceCache[T] {
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return &SliceCache[T]{m: make(map[string][]T)}
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}
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func (c *SliceCache[T]) Get(key string) ([]T, bool) {
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c.RLock()
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v, found := c.m[key]
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c.RUnlock()
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return v, found
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}
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func (c *SliceCache[T]) Append(key string, values ...T) {
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c.Lock()
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c.m[key] = append(c.m[key], values...)
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c.Unlock()
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}
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func (c *SliceCache[T]) Reset() {
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c.Lock()
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c.m = make(map[string][]T)
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c.Unlock()
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}
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