internal/cache/cache.go

@@ -0,0 +1,34 @@
+package cache
+
+import (
+)
+
+type Cache[K comparable, V any] interface {
+	Get(K) (V, bool)
+	Set(K, V)
+	Delete(K)
+	Clear()
+}
+
+type inMem[K comparable, V any] map[K]V
+
+func New[K comparable, V any]() inMem[K, V] {
+	return make(inMem[K, V])
+}
+
+func (c inMem[K, V]) Get(key K) (V, bool) {
+	v, ok := c[key]
+	return v, ok
+}
+
+func (c inMem[K, V]) Set(key K, val V) {
+	c[key] = val
+}
+
+func (c inMem[K, V]) Delete(key K) {
+	delete(c, key)
+}
+
+func (c inMem[K, V]) Clear() {
+	clear(c)
+}

internal/cache/cache_test.go

@@ -0,0 +1,33 @@
+package cache_test
+
+import (
+	"testing"
+
+	"dynatron.me/x/stillbox/internal/cache"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestCache(t *testing.T) {
+	c := cache.New[int, string]()
+	c.Set(4, "asd")
+	g, ok := c.Get(4)
+	assert.Equal(t, "asd", g)
+	assert.True(t, ok)
+
+	_, ok = c.Get(8)
+	assert.False(t, ok)
+
+	c.Set(7, "fg")
+
+	c.Delete(4)
+
+	g, ok = c.Get(4)
+	assert.False(t, ok)
+	assert.NotEqual(t, "asd", g)
+
+	c.Clear()
+	g, ok = c.Get(7)
+	assert.False(t, ok)
+	assert.NotEqual(t, "fg", g)
+}