Reset() don't work

[abolinhas]

What is the issue you are having?
Reset shards no longer works

What is BigCache doing that it shouldn't?
Empty the shards.

Using stats method i can see the how many items are in cache

cache, initErr := bigcache.NewBigCache(config)
cache.Stats()

Output: {"hits":1222,"misses":2,"delete_hits":0,"delete_misses":0,"collisions":0}

but when i run the method Reset to flush the shards, they are not flushed / empty, , in previously versions this method works correctly.

cache, initErr := bigcache.NewBigCache(config)
cache.Reset()

After i run the Reset() the stats are se same
Output: {"hits":1222,"misses":2,"delete_hits":0,"delete_misses":0,"collisions":0}

Environment:

• Version (git sha or release): v3@v3.0.2
• OS (e.g. from /etc/os-release or winver.exe): Debian GNU/Linux 10 (buster)
• go version: 1.18.3

[janisz]

Hi, I created following tests and it looks like stats were never cleared. What version do you mean in this sentence:

in previously versions this method works correctly

package bigcache

import (
	"fmt"
	"testing"
	"time"
)

func TestCacheReset322(t *testing.T) {
	t.Parallel()

	// given
	cache, _ := NewBigCache(Config{
		Shards:             8,
		LifeWindow:         time.Second,
		MaxEntriesInWindow: 1,
		MaxEntrySize:       256,
	})
	keys := 1337

	// when
	for i := 0; i < keys; i++ {
		cache.Set(fmt.Sprintf("key%d", i), []byte("value"))
		cache.Get(fmt.Sprintf("key%d", i))
	}

	// then
	if int64(keys) != cache.Stats().Hits {
		t.Error("Stats not set")
	}

	// and when
	cache.Reset()

	// then
	if int64(0) != cache.Stats().Hits {
		t.Error("Stats not cleared")
	}
}

[Hojun-Cho]

Hello, I think this problem is because Reset() did not reset the cacheShard.Stats

func (c *BigCache) Reset() error {
	for _, shard := range c.shards {
		shard.reset(c.config)
	}
	return nil
}

func (s *cacheShard) reset(config Config) {
	s.lock.Lock()
	s.hashmap = make(map[uint64]uint32, config.initialShardSize())
	s.entryBuffer = make([]byte, config.MaxEntrySize+headersSizeInBytes)
	s.entries.Reset()
	s.lock.Unlock()
}