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# go-cache
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```
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[](https://github.com/num30/go-cache/actions/workflows/test.yaml)
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[](https://codecov.io/gh/num30/go-cache)
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[](https://goreportcard.com/report/github.com/num30/go-cache)
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[](https://pkg.go.dev/github.com/num30/go-cache)
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```
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[](https://ci.sg.caj.me/caj/go-cache)
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ℹ️ go-cache is a port of great [go-cache](https://github.com/patrickmn/go-cache) library that was written by @patrickmn. The main defference is that it relies on generics instead of reflection.
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go-cache is a in-memory key:value store/cache similar to memcached that is
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suitable for applications running on a single machine. Its major advantage is
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that, being essentially a thread-safe `map[string][T]` with expiration
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times, it doesn't need to serialize or transmit its contents over the network.
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Any object can be stored, for a given duration or forever, and the cache can be
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safely used by multiple goroutines.
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Although go-cache isn't meant to be used as a persistent datastore, the entire
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cache can be saved to and loaded from a file (using `c.Items()` to retrieve the
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items map to serialize, and `NewFrom()` to create a cache from a deserialized
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one) to recover from downtime quickly. (See the docs for `NewFrom()` for caveats.)
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### Installation
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`go get github.com/num30/go-cache`
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### Usage
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```go
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import (
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"fmt"
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"github.com/num30/go-cache"
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"time"
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)
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func main() {
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// Create a cache with a default expiration time of 5 minutes, and which
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// purges expired items every 10 minutes
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c := cache.New[string](5*time.Minute, 10*time.Minute)
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// Set the value of the key "foo" to "bar", with the default expiration time
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c.Set("foo", "bar", cache.DefaultExpiration)
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// Set the value of the key "baz" to "lightning", with no expiration time
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// (the item won't be removed until it is re-set, or removed using
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// c.Delete("baz")
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c.Set("baz", "lightning", cache.NoExpiration)
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// Get the string associated with the key "foo" from the cache
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foo, found := c.Get("foo")
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if found {
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fmt.Println(foo)
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}
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// Want performance? Store pointers!
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structCache := cache.New[MyStruct](5*time.Minute, 10*time.Minute)
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structCache.Set("foo", &MyStruct, cache.DefaultExpiration)
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if x, found := c.Get("foo"); found {
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fmt.Println(")
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}
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}
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```
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Run this example with `go run examples/main.go`.
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## Performance Comparison
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Comparison of performance with original [go-cache](https://github.com/patrickmn/go-cache) implementation.
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Spoiler alert! The difference is insignificant.
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| <sub>Test </sub> | <sub> [Non generic](https://github.com/patrickmn/go-cache)</sub> | | <sub>This version</sub> | |
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|----------------------------------------------|-----------|-------------|-----------|---------------|
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| <sub>BenchmarkCacheGetStringExpiring-8 </sub>| <sub>29884011</sub> | <sub>41.45 ns/op</sub> | <sub>28318041</sub> | <sub>43.31 ns/op</sub> |
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| <sub>BenchmarkCacheGetStringNotExpiring-8 </sub>| <sub>91891774</sub> | <sub>14.20 ns/op</sub> | <sub>72259294</sub> | <sub>14.02 ns/op</sub> |
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| <sub>BenchmarkCacheGetConcurrentExpiring-8 </sub>| <sub>26299849</sub> | <sub>42.58 ns/op</sub> | <sub>30129078</sub> | <sub>39.53 ns/op</sub> |
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| <sub>BenchmarkCacheGetConcurrentNotExpiring-8 </sub>| <sub>28991383</sub> | <sub>41.25 ns/op</sub> | <sub>30760544</sub> | <sub>38.09 ns/op</sub> |
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| <sub>BenchmarkCacheGetManyConcurrentExpiring-8 </sub>| <sub>55589712</sub> | <sub>44.90 ns/op</sub> | <sub>56991110</sub> | <sub>38.86 ns/op</sub> |
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| <sub>BenchmarkCacheGetManyConcurrentNotExpiring-8 </sub>| <sub>30105078</sub> | <sub>43.98 ns/op</sub> | <sub>46270045</sub> | <sub>41.54 ns/op</sub> |
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| <sub>BenchmarkCacheSetStringExpiring-8 </sub>| <sub>18392893</sub> | <sub>63.41 ns/op</sub> | <sub>17788724</sub> | <sub>61.42 ns/op</sub> |
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| <sub>BenchmarkCacheSetStringNotExpiring-8 </sub>| <sub>46400654</sub> | <sub>28.45 ns/op</sub> | <sub>40226074</sub> | <sub>27.41 ns/op</sub> |
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| <sub>BenchmarkCacheSetDelete-8 </sub>| <sub>18703620</sub> | <sub>60.75 ns/op</sub> | <sub>18270448</sub> | <sub>59.90 ns/op</sub> |
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| <sub>BenchmarkCacheSetDeleteSingleLock-8 </sub>| <sub>32633755</sub> | <sub>39.34 ns/op</sub> | <sub>32415156</sub> | <sub>36.96 ns/op</sub> |
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| <sub>BenchmarkCacheGetStructExpiring-8 </sub>| <sub>30487856</sub> | <sub>41.60 ns/op</sub> | <sub>26925226</sub> | <sub>40.55 ns/op</sub> |
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| <sub>BenchmarkCacheGetStructNotExpiring-8 </sub>| <sub>91921044</sub> | <sub>13.94 ns/op</sub> | <sub>96379750</sub> | <sub>13.08 ns/op</sub> |
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| <sub>BenchmarkCacheSetStructExpiring-8 </sub>| <sub>13977464</sub> | <sub>86.44 ns/op</sub> | <sub>13364509</sub> | <sub>87.69 ns/op</sub> |
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| <sub>BenchmarkCacheSetStructNotExpiring-8 </sub>| <sub>22749384</sub> | <sub>54.14 ns/op</sub> | <sub>23207397</sub> | <sub>52.58 ns/op</sub> |
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| <sub>BenchmarkCacheSetFatStructExpiring-8 </sub>| <sub>11718718</sub> | <sub>103.3 ns/op</sub> | <sub>12051895</sub> | <sub>102.3 ns/op</sub> |
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| <sub>BenchmarkCacheGetFatStructNotExpiring-8 </sub>| <sub>88695709</sub> | <sub>13.92 ns/op</sub> | <sub>83220014</sub> | <sub>13.76 ns/op</sub> |
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