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分布式多级缓存方案g2cache
软件架构说明
主要内容：
| 模块 | 功能 | 特点 | 注意 |
|---|---|---|---|
| local interface | 本机内存高速缓存 | 纳秒，毫秒级别响应速度；有效期较短 | 实现LocalCache接口，注意控制内存 |
| out interface | 外部高速缓存，如Redis | 较快的访问速度，容量很足 | 实现OutCache接口 |
| LoadDataSourceFunc | 外部数据源 | 外部加载函数，灵活，并发保护 | 需要自行处理panic |
| PubSub | 外部缓存发布订阅 | 外部缓存可以自选实现 | 未实现就不支持分布式 |
local 本地内存高速缓存接口
// Local memory cache，Local memory cache with high access speed
type LocalCache interface {
Get(key string, obj interface{}) (*Entry, bool, error) // obj represents the internal structure of the real object
Set(key string, e *Entry) error // local storage should set Entry.Obsolete
Del(key string) error
ThreadSafe() // Need to ensure thread safety
Close()
}
out 外部缓存接口，值得一提的是外部缓存需要实现发布订阅接口，这是因为g2cache支持分布式多级缓存
// External cache has faster access speed, such as Redis
type OutCache interface {
Get(key string, obj interface{}) (*Entry, bool, error) // obj represents the internal structure of the real object
Set(key string, e *Entry) error // out storage should set Entry.Expiration
Subscribe(data chan *ChannelMeta) error
Publish(gid ,key string, action int8, data *Entry) error
Del(key string) error
ThreadSafe() // Need to ensure thread safety
Close()
}
外部缓存发布订阅
// only out storage pub sub
type PubSub interface {
Subscribe(data chan *ChannelMeta) error
Publish(gid, key string, action int8, data *Entry) error
}
LoadDataSourceFunc 原始数据加载函数，请自行处理panic并以error形式返回
加载函数支持返回string，map，slice，struct，ptr类型
// Shouldn't throw a panic, please return an error
type LoadDataSourceFunc func() (interface{}, error)
缓存效果-初始
[G2CACHE] 2021/04/21 11:46:21 [debug] key:[[g2cache-key:61 ]] => [ hit data source ]
[G2CACHE] 2021/04/21 11:46:21 [debug] key:[[g2cache-key:222 ]] => [ hit data source ]
[G2CACHE] 2021/04/21 11:46:21 [debug] key:[[g2cache-key:61 ]] => [ hit local storage ]
[G2CACHE] 2021/04/21 11:46:21 [debug] key:[[g2cache-key:183 ]] => [ hit data source ]
[G2CACHE] 2021/04/21 11:46:22 [debug] key:[[g2cache-key:83 ]] => [ hit data source ]
[G2CACHE] 2021/04/21 11:46:22 [debug] key:[[g2cache-key:18 ]] => [ hit data source ]
[G2CACHE] 2021/04/21 11:46:22 [debug] key:[[g2cache-key:103 ]] => [ hit local storage ]
[G2CACHE] 2021/04/21 11:46:22 [debug] key:[[g2cache-key:90 ]] => [ hit data source ]
[G2CACHE] 2021/04/21 11:46:22 [debug] key:[[g2cache-key:170 ]] => [ hit data source ]
[G2CACHE] 2021/04/21 11:46:22 [debug] key:[[g2cache-key:101 ]] => [ hit data source ]
[G2CACHE] 2021/04/21 11:46:22 [debug] key:[[g2cache-key:165 ]] => [ hit data source ]
[G2CACHE] 2021/04/21 11:46:23 [debug] statistics [local] hit percentage [[5.8824]]
[G2CACHE] 2021/04/21 11:46:23 [debug] statistics [out] hit percentage [[1.9608]]
[G2CACHE] 2021/04/21 11:46:23 [debug] statistics [data source] hit percentage [[90.1961]]
缓存效果-N分钟后
[G2CACHE] 2021/04/21 12:26:53 [debug] key:[[g2cache-key:106 ]] => [ hit out storage ]
[G2CACHE] 2021/04/21 12:26:53 [debug] key:[[g2cache-key:136 ]] => [ hit data source ]
[G2CACHE] 2021/04/21 12:26:53 [debug] key:[[g2cache-key:100 ]] => [ hit local storage ]
[G2CACHE] 2021/04/21 12:26:53 [debug] key:[[g2cache-key:219 ]] => [ hit data source ]
[G2CACHE] 2021/04/21 12:26:53 [debug] key:[[g2cache-key:13 ]] => [ hit local storage ]
[G2CACHE] 2021/04/21 12:26:53 [debug] key:[[g2cache-key:200 ]] => [ hit local storage ]
[G2CACHE] 2021/04/21 12:26:53 [debug] key:[[g2cache-key:172 ]] => [ hit data source ]
[G2CACHE] 2021/04/21 12:26:53 [debug] statistics [local] hit percentage [[45.3865]]
[G2CACHE] 2021/04/21 12:26:53 [debug] statistics [out] hit percentage [[6.7332]]
[G2CACHE] 2021/04/21 12:26:53 [debug] statistics [data source] hit percentage [[48.1297]]
缓存效果-N+M分钟后
[G2CACHE] 2021/04/21 13:18:53 [debug] key:[[g2cache-key:2 ]] => [ hit local storage ]
[G2CACHE] 2021/04/21 13:18:53 [debug] key:[[g2cache-key:2 ]] => [ hit out storage ]
[G2CACHE] 2021/04/21 13:18:53 [debug] key:[[g2cache-key:113 ]] => [ hit local storage ]
[G2CACHE] 2021/04/21 13:18:53 [debug] key:[[g2cache-key:113 ]] => [ hit out storage ]
[G2CACHE] 2021/04/21 13:18:53 [debug] key:[[g2cache-key:43 ]] => [ hit local storage ]
[G2CACHE] 2021/04/21 13:18:53 [debug] key:[[g2cache-key:43 ]] => [ hit out storage ]
[G2CACHE] 2021/04/21 13:18:53 [debug] statistics [local] hit percentage [[82.3877]]
[G2CACHE] 2021/04/21 13:18:53 [debug] statistics [out] hit percentage [[16.2689]]
[G2CACHE] 2021/04/21 13:18:53 [debug] statistics [data source] hit percentage [[1.3641]]
go get -u gitee.com/kelvins-io/g2cache@v4.0.5
修改example/main.go中Redis的配置
sh example-run.sh
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