BigCache ——Go 语言编写的高效缓存服务

2017-10-11 fankaifun4

BigCache 是用于在 Go 中写入千兆字节数据的高效缓存。快速,并发,逐行扫描内存缓存,以保持大量条目,而不影响性能。 BigCache 在堆上保留条目,但为它们省略了 GC。 要实现对字节数组的操作,因此在大多数用例中将需要在高速缓存前面进行条目(de)序列化。

简单初始化

import "github.com/allegro/bigcache"

cache, _ := bigcache.NewBigCache(bigcache.DefaultConfig(10 * time.Minute))

cache.Set("my-unique-key", []byte("value"))

entry, _ := cache.Get("my-unique-key")
fmt.Println(string(entry))

自定义初始化

import (
	"log"

	"github.com/allegro/bigcache"
)

config := bigcache.Config {
		// number of shards (must be a power of 2)
		Shards: 1024,
		// time after which entry can be evicted
		LifeWindow: 10 * time.Minute,
		// rps * lifeWindow, used only in initial memory allocation
		MaxEntriesInWindow: 1000 * 10 * 60,
		// max entry size in bytes, used only in initial memory allocation
		MaxEntrySize: 500,
		// prints information about additional memory allocation
		Verbose: true,
		// cache will not allocate more memory than this limit, value in MB
		// if value is reached then the oldest entries can be overridden for the new ones
		// 0 value means no size limit
		HardMaxCacheSize: 8192,
		// callback fired when the oldest entry is removed because of its
		// expiration time or no space left for the new entry. Default value is nil which
		// means no callback and it prevents from unwrapping the oldest entry.
		OnRemove: nil,
	}

cache, initErr := bigcache.NewBigCache(config)
if initErr != nil {
	log.Fatal(initErr)
}

cache.Set("my-unique-key", []byte("value"))

if entry, err := cache.Get("my-unique-key"); err == nil {
	fmt.Println(string(entry))
}

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