add isExpired bool to OnEvicted callback signature

cache.go

@@ -41,7 +41,7 @@ type cache struct {
 	defaultExpiration time.Duration
 	items             map[string]Item
 	mu                sync.RWMutex
-	onEvicted         func(string, interface{})
+	onEvicted         func(string, interface{}, bool)
 	janitor           *janitor
 }
 
@@ -907,7 +907,7 @@ func (c *cache) Delete(k string) {
 	v, evicted := c.delete(k)
 	c.mu.Unlock()
 	if evicted {
-		c.onEvicted(k, v)
+		c.onEvicted(k, v, false)
 	}
 }
 
@@ -943,14 +943,14 @@ func (c *cache) DeleteExpired() {
 	}
 	c.mu.Unlock()
 	for _, v := range evictedItems {
-		c.onEvicted(v.key, v.value)
+		c.onEvicted(v.key, v.value, true)
 	}
 }
 
 // Sets an (optional) function that is called with the key and value when an
 // item is evicted from the cache. (Including when it is deleted manually, but
 // not when it is overwritten.) Set to nil to disable.
-func (c *cache) OnEvicted(f func(string, interface{})) {
+func (c *cache) OnEvicted(f func(string, interface{}, bool)) {
 	c.mu.Lock()
 	c.onEvicted = f
 	c.mu.Unlock()

cache_test.go

@@ -1231,8 +1231,8 @@ func TestOnEvicted(t *testing.T) {
 		t.Fatal("tc.onEvicted is not nil")
 	}
 	works := false
-	tc.OnEvicted(func(k string, v interface{}) {
-		if k == "foo" && v.(int) == 3 {
+	tc.OnEvicted(func(k string, v interface{}, expired bool) {
+		if k == "foo" && v.(int) == 3 && expired == false {
 			works = true
 		}
 		tc.Set("bar", 4, DefaultExpiration)
@@ -1247,6 +1247,29 @@ func TestOnEvicted(t *testing.T) {
 	}
 }
 
+func TestOnEvictedWithExpired(t *testing.T) {
+	tc := New(DefaultExpiration, 0)
+	tc.Set("foo", 3, 1)
+	if tc.onEvicted != nil {
+		t.Fatal("tc.onEvicted is not nil")
+	}
+	works := false
+	tc.OnEvicted(func(k string, v interface{}, expired bool) {
+		if k == "foo" && v.(int) == 3 && expired == true {
+			works = true
+		}
+		tc.Set("bar", 4, DefaultExpiration)
+	})
+	tc.DeleteExpired()
+
+	x, _ := tc.Get("bar")
+	if !works {
+		t.Error("works bool not true")
+	}
+	if x.(int) != 4 {
+		t.Error("bar was not 4")
+	}
+}
 func TestCacheSerialization(t *testing.T) {
 	tc := New(DefaultExpiration, 0)
 	testFillAndSerialize(t, tc)