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https://github.com/sima-land/go-local-cache
Simple cache keeps data in memory and prevents dog pile effect
https://github.com/sima-land/go-local-cache
cache dogpile golang lru lru-cache singleflight
Last synced: 25 days ago
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Simple cache keeps data in memory and prevents dog pile effect
- Host: GitHub
- URL: https://github.com/sima-land/go-local-cache
- Owner: sima-land
- License: bsd-3-clause
- Created: 2016-10-18T05:00:17.000Z (over 7 years ago)
- Default Branch: master
- Last Pushed: 2017-07-10T11:14:22.000Z (about 7 years ago)
- Last Synced: 2024-04-15T10:06:15.305Z (3 months ago)
- Topics: cache, dogpile, golang, lru, lru-cache, singleflight
- Language: Go
- Size: 10.7 KB
- Stars: 5
- Watchers: 8
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Lists
- awesome-go - Golang local cache - simple local cache (Data structures)
README
# Golang local cache
Implementation of simple local cache.
[](https://travis-ci.org/sima-land/go-local-cache)
[](https://goreportcard.com/report/github.com/sima-land/go-local-cache)
Features & todos:
- [x] prevents "dogpile effect"
- [x] check data expiration time
- [x] lru policy
- [ ] cache hit and enviction stats
Cache limitations:
- keys are always int
- get function returns multiple values
- set function sets multiple keys at once
- to prevent dog pile effect queueKey should be manually set
## How to use
Create cache instance
```golang
import "github.com/sima-land/go-local-cache"
c := cache.New()
```
Create getter function. Its preferred way to fill the cache because in case of "dog pile" effect getter will be
called once.
```golang
getter := func(keys Keys) (Result, error) {
r := Result{}
for _, k := range keys {
// haavy call to database
r[k] = db.GetByID(k)
}
return r, nil
}
```
Obtain data from cache. If there is no data in the cache getter will be called.
Note:
1. Next call is concurrently safe
2. If too many go-routines in our application are trying to call this getter with same queue key (user-1)
then only first call will actually be done
```golang
result, err := c.Get(int[]{1}, getter, "user-1")
```
## QueueKey param explain
You can simple use entity name and id as queueKey param of Get function. Eg:
```golang
result, err := c.Get(int[]{1}, userGetter, "user-1")
result, err := c.Get(int[]{1}, productGetter, "product-1")
```
Or if you need to get a page of product's block whole page. If keys 1,2 are in cache but other keys are not then:
1. Keys 1 and 2 will be get from cache
2. Getter will be called for keys 3,4,5 and 6
3. If another getter with same queue key "product-1" was called before and first one will be used instead
```golang
result, err := c.Get(int[]{1,2,3,4,5,6}, userGetter, "product-page-1")
```
## Options
Cache has a variety of configuration options:
``` golang
c := cache.New(cache.Options{
MaxEntries: 1000000, // Specify max number items in cache
TTL: time.Hour, // Time to live for cache entries
})
```
## Test
MacBook 2,7 GHz Intel Core i5
```
BenchmarkCache_Get-4 500000 2274 ns/op
BenchmarkCache_Get-4 500000 2335 ns/op
```