From 4a10e24f29d4d4d3ac7415611308cf0e6293ae7c Mon Sep 17 00:00:00 2001
From: BugLesser <17674638850@163.com>
Date: Thu, 29 Dec 2022 13:08:49 +0800
Subject: [PATCH] add Rename() support

---
 cache.go      | 12 ++++++++++++
 cache_test.go | 13 +++++++++++++
 2 files changed, 25 insertions(+)

diff --git a/cache.go b/cache.go
index db88d2f..51f1876 100644
--- a/cache.go
+++ b/cache.go
@@ -115,6 +115,18 @@ func (c *cache) Replace(k string, x interface{}, d time.Duration) error {
 	return nil
 }
 
+func (c *cache) Rename(oldk, newk string) error {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+	item, found := c.get(oldk)
+	if !found {
+		return fmt.Errorf("Item %s doesn't exist", oldk)
+	}
+	delete(c.items, oldk)
+	c.items[newk] = item
+	return nil
+}
+
 // Get an item from the cache. Returns the item or nil, and a bool indicating
 // whether the key was found.
 func (c *cache) Get(k string) (interface{}, bool) {
diff --git a/cache_test.go b/cache_test.go
index de3e9d6..3146ad7 100644
--- a/cache_test.go
+++ b/cache_test.go
@@ -1137,6 +1137,19 @@ func TestReplace(t *testing.T) {
 	}
 }
 
+func TestRename(t *testing.T) {
+	tc := New(DefaultExpiration, 0)
+	err := tc.Rename("foo", "bar")
+	if err != nil {
+		t.Error(err)
+	}
+	tc.Set("foo", 123, DefaultExpiration)
+	err = tc.Rename("foo", "bar")
+	if err != nil {
+		t.Error(err)
+	}
+}
+
 func TestDelete(t *testing.T) {
 	tc := New(DefaultExpiration, 0)
 	tc.Set("foo", "bar", DefaultExpiration)