105 lines
3.2 KiB
Go
105 lines
3.2 KiB
Go
// Copyright 2014 beego Author. 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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//
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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 cache provide a Cache interface and some implement engine
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// Usage:
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//
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// import(
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// "github.com/astaxie/beego/cache"
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// )
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//
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// bm, err := cache.NewCache("memory", `{"interval":60}`)
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//
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// Use it like this:
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//
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// bm.Put("astaxie", 1, 10 * time.Second)
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// bm.Get("astaxie")
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// bm.IsExist("astaxie")
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// bm.Delete("astaxie")
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//
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// more docs http://beego.me/docs/module/cache.md
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package cache
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import (
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"context"
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"fmt"
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"time"
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)
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// Cache interface contains all behaviors for cache adapter.
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// usage:
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// cache.Register("file",cache.NewFileCache) // this operation is run in init method of file.go.
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// c,err := cache.NewCache("file","{....}")
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// c.Put("key",value, 3600 * time.Second)
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// v := c.Get("key")
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//
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// c.Incr("counter") // now is 1
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// c.Incr("counter") // now is 2
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// count := c.Get("counter").(int)
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type Cache interface {
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// Get a cached value by key.
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Get(ctx context.Context, key string) (interface{}, error)
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// GetMulti is a batch version of Get.
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GetMulti(ctx context.Context, keys []string) ([]interface{}, error)
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// Set a cached value with key and expire time.
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Put(ctx context.Context, key string, val interface{}, timeout time.Duration) error
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// Delete cached value by key.
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Delete(ctx context.Context, key string) error
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// Increment a cached int value by key, as a counter.
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Incr(ctx context.Context, key string) error
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// Decrement a cached int value by key, as a counter.
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Decr(ctx context.Context, key string) error
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// Check if a cached value exists or not.
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IsExist(ctx context.Context, key string) (bool, error)
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// Clear all cache.
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ClearAll(ctx context.Context) error
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// Start gc routine based on config string settings.
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StartAndGC(config string) error
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}
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// Instance is a function create a new Cache Instance
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type Instance func() Cache
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var adapters = make(map[string]Instance)
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// Register makes a cache adapter available by the adapter name.
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// If Register is called twice with the same name or if driver is nil,
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// it panics.
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func Register(name string, adapter Instance) {
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if adapter == nil {
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panic("cache: Register adapter is nil")
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}
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if _, ok := adapters[name]; ok {
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panic("cache: Register called twice for adapter " + name)
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}
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adapters[name] = adapter
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}
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// NewCache creates a new cache driver by adapter name and config string.
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// config: must be in JSON format such as {"interval":360}.
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// Starts gc automatically.
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func NewCache(adapterName, config string) (adapter Cache, err error) {
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instanceFunc, ok := adapters[adapterName]
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if !ok {
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err = fmt.Errorf("cache: unknown adapter name %q (forgot to import?)", adapterName)
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return
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}
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adapter = instanceFunc()
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err = adapter.StartAndGC(config)
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if err != nil {
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adapter = nil
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}
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return
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}
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