basic.go

// Copyright 2023 FishGoddess. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package main

import (
	"fmt"
	"time"

	"github.com/FishGoddess/cachego"
)

func main() {
	// Use NewCache function to create a cache.
	// By default, it creates a standard cache which evicts entries randomly.
	// Use WithShardings to shard cache to several parts for higher performance.
	// Use WithGC to clean expired entries every 10 minutes.
	cache := cachego.NewCache(cachego.WithGC(10*time.Minute), cachego.WithShardings(64))

	// Set an entry to cache with ttl.
	cache.Set("key", 123, time.Second)

	// Get an entry from cache.
	value, ok := cache.Get("key")
	fmt.Println(value, ok) // 123 true

	// Check how many entries stores in cache.
	size := cache.Size()
	fmt.Println(size) // 1

	// Clean expired entries.
	cleans := cache.GC()
	fmt.Println(cleans) // 1

	// Set an entry which doesn't have ttl.
	cache.Set("key", 123, cachego.NoTTL)

	// Remove an entry.
	removedValue := cache.Remove("key")
	fmt.Println(removedValue) // 123

	// Reset resets cache to initial status.
	cache.Reset()

	// Get value from cache and load it to cache if not found.
	value, ok = cache.Get("key")
	if !ok {
		// Loaded entry will be set to cache and returned.
		// By default, it will use singleflight.
		value, _ = cache.Load("key", time.Second, func() (value interface{}, err error) {
			return 666, nil
		})
	}

	fmt.Println(value) // 666

	// You can use WithLRU to specify the type of cache to lru.
	// Also, try WithLFU if you want to use lfu to evict data.
	cache = cachego.NewCache(cachego.WithLRU(100))
	cache = cachego.NewCache(cachego.WithLFU(100))

	// Use NewCacheWithReport to create a cache with report.
	cache, reporter := cachego.NewCacheWithReport(cachego.WithCacheName("test"))
	fmt.Println(reporter.CacheName())
	fmt.Println(reporter.CacheType())
}