mirror of
https://github.com/gohugoio/hugo.git
synced 2024-12-26 15:01:33 +00:00
80 lines
2.1 KiB
Go
80 lines
2.1 KiB
Go
// Copyright 2017-present 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 cache
|
|
|
|
import (
|
|
"sync"
|
|
)
|
|
|
|
// Partition represents a cache partition where Load is the callback
|
|
// for when the partition is needed.
|
|
type Partition struct {
|
|
Key string
|
|
Load func() (map[string]interface{}, error)
|
|
}
|
|
|
|
type lazyPartition struct {
|
|
initSync sync.Once
|
|
cache map[string]interface{}
|
|
load func() (map[string]interface{}, error)
|
|
}
|
|
|
|
func (l *lazyPartition) init() error {
|
|
var err error
|
|
l.initSync.Do(func() {
|
|
var c map[string]interface{}
|
|
c, err = l.load()
|
|
l.cache = c
|
|
})
|
|
|
|
return err
|
|
}
|
|
|
|
// PartitionedLazyCache is a lazily loaded cache paritioned by a supplied string key.
|
|
type PartitionedLazyCache struct {
|
|
partitions map[string]*lazyPartition
|
|
}
|
|
|
|
// NewPartitionedLazyCache creates a new NewPartitionedLazyCache with the supplied
|
|
// partitions.
|
|
func NewPartitionedLazyCache(partitions ...Partition) *PartitionedLazyCache {
|
|
lazyPartitions := make(map[string]*lazyPartition, len(partitions))
|
|
for _, partition := range partitions {
|
|
lazyPartitions[partition.Key] = &lazyPartition{load: partition.Load}
|
|
}
|
|
cache := &PartitionedLazyCache{partitions: lazyPartitions}
|
|
|
|
return cache
|
|
}
|
|
|
|
// Get initializes the partition if not already done so, then looks up the given
|
|
// key in the given partition, returns nil if no value found.
|
|
func (c *PartitionedLazyCache) Get(partition, key string) (interface{}, error) {
|
|
p, found := c.partitions[partition]
|
|
|
|
if !found {
|
|
return nil, nil
|
|
}
|
|
|
|
if err := p.init(); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
if v, found := p.cache[key]; found {
|
|
return v, nil
|
|
}
|
|
|
|
return nil, nil
|
|
|
|
}
|