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This commit also consolidates all (or the most important) memory caches in Hugo. Fixes gohugoio#7425
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,108 @@ | ||
| // Copyright 2020 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. | ||
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| // Package memcache provides the core memory cache used in Hugo. | ||
| package memcache | ||
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| import ( | ||
| "time" | ||
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| "github.com/BurntSushi/locker" | ||
| "github.com/karlseguin/ccache" | ||
| ) | ||
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| // Cache configures a cache. | ||
| type Cache struct { | ||
| cache *ccache.LayeredCache | ||
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| ttl time.Duration | ||
| nlocker *locker.Locker | ||
| } | ||
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| type cacheEntry struct { | ||
| size int64 | ||
| value interface{} | ||
| err error | ||
| } | ||
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| func (c cacheEntry) Size() int64 { | ||
| return c.size | ||
| } | ||
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| // New creates a new cache. | ||
| func New() *Cache { | ||
| return &Cache{ | ||
| // TODO1 | ||
| cache: ccache.Layered(ccache.Configure().MaxSize(100).ItemsToPrune(100)), | ||
| ttl: time.Second * 5, | ||
| nlocker: locker.NewLocker(), | ||
| } | ||
| } | ||
|
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| // Clear clears the cache state. | ||
| // This method is not thread safe. | ||
| func (c *Cache) Clear() { | ||
| c.nlocker = locker.NewLocker() | ||
| c.cache.Clear() | ||
| } | ||
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| func (c *Cache) Has(primary, secondary string) bool { | ||
| return c.cache.Get(primary, secondary) != nil | ||
| } | ||
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| func (c *Cache) Get(primary, secondary string) (interface{}, bool) { | ||
| v := c.cache.Get(primary, secondary) | ||
| if v == nil { | ||
| return nil, false | ||
| } | ||
| return v.Value(), true | ||
| } | ||
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| func (c *Cache) DeleteAll(primary string) bool { | ||
| return c.cache.DeleteAll(primary) | ||
| } | ||
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| func (c *Cache) Stop() { | ||
| c.cache.Stop() | ||
| } | ||
|
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| // GetOrCreate tries to get the value with the given cache keys, if not found | ||
| // create will be called and cached. | ||
| // This method is thread safe. | ||
| func (c *Cache) GetOrCreate(primary, secondary string, create func() (interface{}, error)) (interface{}, error) { | ||
| if v := c.cache.Get(primary, secondary); v != nil { | ||
| entry := v.Value().(cacheEntry) | ||
| return entry.value, entry.err | ||
| } | ||
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| // The provided create function may be a relatively time consuming operation, | ||
| // and there will in the commmon case be concurrent requests for the same key'd | ||
| // resource, so make sure we pause these until the result is ready. | ||
| key := primary + secondary | ||
| c.nlocker.Lock(key) | ||
| defer c.nlocker.Unlock(key) | ||
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| // Try again. | ||
| if v := c.cache.Get(primary, secondary); v != nil { | ||
| entry := v.Value().(cacheEntry) | ||
| return entry.value, entry.err | ||
| } | ||
|
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| // Create it and store it in cache. | ||
| value, err := create() | ||
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| // TODO1 size | ||
| c.cache.Set(primary, secondary, cacheEntry{value: value, err: err, size: 1}, c.ttl) | ||
|
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| return value, err | ||
| } |
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