refactor: cache interface

pkg/remote/aws/repository/ec2_repository.go

@@ -24,7 +24,7 @@ type EC2Client interface {
 
 type ec2Repository struct {
 	client ec2iface.EC2API
-	cache  *cache.Cache
+	cache  cache.Cache
 }
 
 func NewEC2Repository(session *session.Session) *ec2Repository {

pkg/remote/cache/cache.go

@@ -1,20 +1,27 @@
 package cache
 
-import "sync"
+import (
+	"sync"
+)
 
-type Cache struct {
+type Cache interface {
+	Set(string, interface{}) bool
+	Get(string) interface{}
+}
+
+type Store struct {
 	mu    *sync.RWMutex
 	store map[string]interface{}
 }
 
-func New() *Cache {
-	return &Cache{
+func New() Cache {
+	return &Store{
 		mu:    &sync.RWMutex{},
 		store: map[string]interface{}{},
 	}
 }
 
-func (c *Cache) Set(key string, value interface{}) (overridden bool) {
+func (c *Store) Set(key string, value interface{}) (overridden bool) {
 	c.mu.Lock()
 	defer c.mu.Unlock()
 	if _, ok := c.store[key]; ok {
@@ -24,7 +31,7 @@ func (c *Cache) Set(key string, value interface{}) (overridden bool) {
 	return
 }
 
-func (c *Cache) Get(key string) interface{} {
+func (c *Store) Get(key string) interface{} {
 	c.mu.RLock()
 	defer c.mu.RUnlock()
 	return c.store[key]