mirror of
https://github.com/gohugoio/hugo.git
synced 2024-12-12 21:32:42 -05:00
135 lines
2.8 KiB
Go
135 lines
2.8 KiB
Go
// Copyright 2019 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 page
|
|
|
|
import (
|
|
"sync"
|
|
)
|
|
|
|
type pageCacheEntry struct {
|
|
in []Pages
|
|
out Pages
|
|
}
|
|
|
|
func (entry pageCacheEntry) matches(pageLists []Pages) bool {
|
|
if len(entry.in) != len(pageLists) {
|
|
return false
|
|
}
|
|
for i, p := range pageLists {
|
|
if !pagesEqual(p, entry.in[i]) {
|
|
return false
|
|
}
|
|
}
|
|
|
|
return true
|
|
}
|
|
|
|
type pageCache struct {
|
|
sync.RWMutex
|
|
m map[string][]pageCacheEntry
|
|
}
|
|
|
|
func newPageCache() *pageCache {
|
|
return &pageCache{m: make(map[string][]pageCacheEntry)}
|
|
}
|
|
|
|
func (c *pageCache) clear() {
|
|
c.Lock()
|
|
defer c.Unlock()
|
|
c.m = make(map[string][]pageCacheEntry)
|
|
}
|
|
|
|
// get/getP gets a Pages slice from the cache matching the given key and
|
|
// all the provided Pages slices.
|
|
// If none found in cache, a copy of the first slice is created.
|
|
//
|
|
// If an apply func is provided, that func is applied to the newly created copy.
|
|
//
|
|
// The getP variant' apply func takes a pointer to Pages.
|
|
//
|
|
// The cache and the execution of the apply func is protected by a RWMutex.
|
|
func (c *pageCache) get(key string, apply func(p Pages), pageLists ...Pages) (Pages, bool) {
|
|
return c.getP(key, func(p *Pages) {
|
|
if apply != nil {
|
|
apply(*p)
|
|
}
|
|
}, pageLists...)
|
|
}
|
|
|
|
func (c *pageCache) getP(key string, apply func(p *Pages), pageLists ...Pages) (Pages, bool) {
|
|
c.RLock()
|
|
if cached, ok := c.m[key]; ok {
|
|
for _, entry := range cached {
|
|
if entry.matches(pageLists) {
|
|
c.RUnlock()
|
|
return entry.out, true
|
|
}
|
|
}
|
|
}
|
|
c.RUnlock()
|
|
|
|
c.Lock()
|
|
defer c.Unlock()
|
|
|
|
// double-check
|
|
if cached, ok := c.m[key]; ok {
|
|
for _, entry := range cached {
|
|
if entry.matches(pageLists) {
|
|
return entry.out, true
|
|
}
|
|
}
|
|
}
|
|
|
|
p := pageLists[0]
|
|
pagesCopy := append(Pages(nil), p...)
|
|
|
|
if apply != nil {
|
|
apply(&pagesCopy)
|
|
}
|
|
|
|
entry := pageCacheEntry{in: pageLists, out: pagesCopy}
|
|
if v, ok := c.m[key]; ok {
|
|
c.m[key] = append(v, entry)
|
|
} else {
|
|
c.m[key] = []pageCacheEntry{entry}
|
|
}
|
|
|
|
return pagesCopy, false
|
|
}
|
|
|
|
// pagesEqual returns whether p1 and p2 are equal.
|
|
func pagesEqual(p1, p2 Pages) bool {
|
|
if p1 == nil && p2 == nil {
|
|
return true
|
|
}
|
|
|
|
if p1 == nil || p2 == nil {
|
|
return false
|
|
}
|
|
|
|
if p1.Len() != p2.Len() {
|
|
return false
|
|
}
|
|
|
|
if p1.Len() == 0 {
|
|
return true
|
|
}
|
|
|
|
for i := 0; i < len(p1); i++ {
|
|
if p1[i] != p2[i] {
|
|
return false
|
|
}
|
|
}
|
|
return true
|
|
}
|