From 162d4e27ca4b2a863b2f41a49a58b9259d4ccce3 Mon Sep 17 00:00:00 2001
From: Matthew Dale <matthew@matthewrdale.com>
Date: Thu, 7 Jul 2016 15:32:49 -0700
Subject: [PATCH] Use nanosecond-resolution TTL instead of second-resolution.

---
 bucket.go       |  2 +-
 cache.go        |  2 +-
 item.go         |  8 ++++----
 item_test.go    | 28 +++++++++++++++-------------
 layeredcache.go |  2 +-
 5 files changed, 22 insertions(+), 20 deletions(-)

diff --git a/bucket.go b/bucket.go
index e330d24..d675351 100644
--- a/bucket.go
+++ b/bucket.go
@@ -17,7 +17,7 @@ func (b *bucket) get(key string) *Item {
 }
 
 func (b *bucket) set(key string, value interface{}, duration time.Duration) (*Item, *Item) {
-	expires := time.Now().Add(duration).Unix()
+	expires := time.Now().Add(duration).UnixNano()
 	item := newItem(key, value, expires)
 	b.Lock()
 	defer b.Unlock()
diff --git a/cache.go b/cache.go
index 81cbfde..998d1db 100644
--- a/cache.go
+++ b/cache.go
@@ -47,7 +47,7 @@ func (c *Cache) Get(key string) *Item {
 	if item == nil {
 		return nil
 	}
-	if item.expires > time.Now().Unix() {
+	if item.expires > time.Now().UnixNano() {
 		c.promote(item)
 	}
 	return item
diff --git a/item.go b/item.go
index 1c35ae7..bb7c04f 100644
--- a/item.go
+++ b/item.go
@@ -85,19 +85,19 @@ func (i *Item) Release() {
 
 func (i *Item) Expired() bool {
 	expires := atomic.LoadInt64(&i.expires)
-	return expires < time.Now().Unix()
+	return expires < time.Now().UnixNano()
 }
 
 func (i *Item) TTL() time.Duration {
 	expires := atomic.LoadInt64(&i.expires)
-	return time.Second * time.Duration(expires-time.Now().Unix())
+	return time.Nanosecond * time.Duration(expires-time.Now().UnixNano())
 }
 
 func (i *Item) Expires() time.Time {
 	expires := atomic.LoadInt64(&i.expires)
-	return time.Unix(expires, 0)
+	return time.Unix(0, expires)
 }
 
 func (i *Item) Extend(duration time.Duration) {
-	atomic.StoreInt64(&i.expires, time.Now().Add(duration).Unix())
+	atomic.StoreInt64(&i.expires, time.Now().Add(duration).UnixNano())
 }
diff --git a/item_test.go b/item_test.go
index a62ab3d..9311c9b 100644
--- a/item_test.go
+++ b/item_test.go
@@ -1,9 +1,11 @@
 package ccache
 
 import (
-	. "github.com/karlseguin/expect"
+	"math"
 	"testing"
 	"time"
+
+	. "github.com/karlseguin/expect"
 )
 
 type ItemTests struct{}
@@ -19,29 +21,29 @@ func (_ *ItemTests) Promotability() {
 }
 
 func (_ *ItemTests) Expired() {
-	now := time.Now().Unix()
-	item1 := &Item{expires: now + 1}
-	item2 := &Item{expires: now - 1}
+	now := time.Now().UnixNano()
+	item1 := &Item{expires: now + (10 * int64(time.Millisecond))}
+	item2 := &Item{expires: now - (10 * int64(time.Millisecond))}
 	Expect(item1.Expired()).To.Equal(false)
 	Expect(item2.Expired()).To.Equal(true)
 }
 
 func (_ *ItemTests) TTL() {
-	now := time.Now().Unix()
-	item1 := &Item{expires: now + 10}
-	item2 := &Item{expires: now - 10}
-	Expect(item1.TTL()).To.Equal(time.Second * 10)
-	Expect(item2.TTL()).To.Equal(time.Second * -10)
+	now := time.Now().UnixNano()
+	item1 := &Item{expires: now + int64(time.Second)}
+	item2 := &Item{expires: now - int64(time.Second)}
+	Expect(int(math.Ceil(item1.TTL().Seconds()))).To.Equal(1)
+	Expect(int(math.Ceil(item2.TTL().Seconds()))).To.Equal(-1)
 }
 
 func (_ *ItemTests) Expires() {
-	now := time.Now().Unix()
-	item := &Item{expires: now + 10}
-	Expect(item.Expires().Unix()).To.Equal(now + 10)
+	now := time.Now().UnixNano()
+	item := &Item{expires: now + (10)}
+	Expect(item.Expires().UnixNano()).To.Equal(now + 10)
 }
 
 func (_ *ItemTests) Extend() {
-	item := &Item{expires: time.Now().Unix() + 10}
+	item := &Item{expires: time.Now().UnixNano() + 10}
 	item.Extend(time.Minute * 2)
 	Expect(item.Expires().Unix()).To.Equal(time.Now().Unix() + 120)
 }
diff --git a/layeredcache.go b/layeredcache.go
index 902489d..70a2852 100644
--- a/layeredcache.go
+++ b/layeredcache.go
@@ -58,7 +58,7 @@ func (c *LayeredCache) Get(primary, secondary string) *Item {
 	if item == nil {
 		return nil
 	}
-	if item.expires > time.Now().Unix() {
+	if item.expires > time.Now().UnixNano() {
 		c.promote(item)
 	}
 	return item