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Concurrency-safe golang caching library with expiration capabilities.


Make sure you have a working Go environment (Go 1.2 or higher is required). See the install instructions.

To install cache2go, simply run:

go get

To compile it from source:

cd $GOPATH/src/
go get -u -v
go build && go test -v


package main

import (

// Keys & values in cache2go can be of arbitrary types, e.g. a struct.
type myStruct struct {
	text     string
	moreData []byte

func main() {
	// Accessing a new cache table for the first time will create it.
	cache := cache2go.Cache("myCache")

	// We will put a new item in the cache. It will expire after
	// not being accessed via Value(key) for more than 5 seconds.
	val := myStruct{"This is a test!", []byte{}}
	cache.Add("someKey", 5*time.Second, &val)

	// Let's retrieve the item from the cache.
	res, err := cache.Value("someKey")
	if err == nil {
		fmt.Println("Found value in cache:", res.Data().(*myStruct).text)
	} else {
		fmt.Println("Error retrieving value from cache:", err)

	// Wait for the item to expire in cache.
	time.Sleep(6 * time.Second)
	res, err = cache.Value("someKey")
	if err != nil {
		fmt.Println("Item is not cached (anymore).")

	// Add another item that never expires.
	cache.Add("someKey", 0, &val)

	// cache2go supports a few handy callbacks and loading mechanisms.
	cache.SetAboutToDeleteItemCallback(func(e *cache2go.CacheItem) {
		fmt.Println("Deleting:", e.Key(), e.Data().(*myStruct).text, e.CreatedOn())

	// Remove the item from the cache.

	// And wipe the entire cache table.

To run this example, go to examples/mycachedapp/ and run:

go run mycachedapp.go

You can find a few more examples here. Also see our test-cases in cache_test.go for further working examples.


Concurrency-safe Go caching library with expiration capabilities and access counters



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