test/pool/pool_test.go

package pool_test

import (
	"fmt"
	"runtime"
	"sync"
	"testing"
	"time"
)

func TestPool1(t *testing.T) {
	p := &sync.Pool{
		New: func() any {
			return make([]map[string]any, 0, 100)
		},
	}
	ms := p.Get().([]map[string]any)
	for i := 1; i < 100; i++ {
		m := map[string]any{"": i}
		runtime.SetFinalizer(&m, func(o *map[string]any) {
			fmt.Println("Object ", (*o)[""], " has been garbage collected")
		})
		ms = append(ms, m)
	}

	p.Put(ms[:0])

	runtime.GC()

	time.Sleep(1 * time.Minute)
}