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README.md

@@ -103,4 +103,4 @@ one) to recover from downtime quickly. (See the docs for `NewFrom()` for caveats
 
 ### Reference
 
-`godoc` or [http://godoc.org/github.com/pmylund/go-cache](http://godoc.org/github.com/pmylund/go-cache)
+`godoc` or [http://godoc.org/github.com/patrickmn/go-cache](http://godoc.org/github.com/patrickmn/go-cache)

cache.go

@@ -11,24 +11,25 @@ import (
 	"time"
 )
 
-var emptyTime = time.Time{}
 
 type Item struct {
 	Object     	interface{}
-	Expiration 	time.Time
+	Expiration 	int64
 	Key 		   	string
 }
 
 func (item Item) Less(than llrb.Item) bool {
-	return item.Expiration.Before(than.(Item).Expiration)
+	//return item.Expiration.Before(than.(Item).Expiration)
+	return item.Expiration < than.(Item).Expiration 
 }
 
+
 // Returns true if the item has expired.
 func (item Item) Expired() bool {
-	if item.Expiration == emptyTime {
+	if item.Expiration == 0 {
 		return false
 	}
-	return item.Expiration.Before(time.Now())
+	return time.Now().UnixNano() > item.Expiration
 }
 
 const (
@@ -74,19 +75,18 @@ func (c *cache) set(k string, x interface{}, d time.Duration) {
 		d = c.defaultExpiration
 	}
 	if d > 0 {
-		item.Expiration = time.Now().Add(d)
+		item.Expiration = time.Now().Add(d).UnixNano()
 		//if an item with the same key exists in the cache, remove it from the bst
 		old, found := c.items[k]
 		if found {
 			c.sortedItems.Delete(old)
 			c.sortedItems.InsertNoReplace(item)
 		}		
-	} else {
-		item.Expiration = emptyTime
 	} 	
 	c.items[k] = item
 }
 
+
 // Add an item to the cache only if an item doesn't already exist for the given
 // key, or if the existing item has expired. Returns an error otherwise.
 func (c *cache) Add(k string, x interface{}, d time.Duration) error {
@@ -119,16 +119,34 @@ func (c *cache) Replace(k string, x interface{}, d time.Duration) error {
 // whether the key was found.
 func (c *cache) Get(k string) (interface{}, bool) {
 	c.mu.RLock()
-	x, found := c.get(k)
+	// "Inlining" of get and Expired
+	item, found := c.items[k]
+	if !found {
+		c.mu.RUnlock()
+		return nil, false
+	}
+	if item.Expiration > 0 {
+		if time.Now().UnixNano() > item.Expiration {
+			c.mu.RUnlock()
+			return nil, false
+		}
+	}
 	c.mu.RUnlock()
-	return x, found
+	return item.Object, true
 }
 
 func (c *cache) get(k string) (interface{}, bool) {
 	item, found := c.items[k]
-	if !found || item.Expired() {
+	if !found {
 		return nil, false
 	}
+	// "Inlining" of Expired
+	if item.Expiration > 0 {
+		if time.Now().UnixNano() > item.Expiration {
+			c.mu.RUnlock()
+			return nil, false
+		}
+	}
 	return item.Object, true
 }
 
@@ -144,7 +162,7 @@ func (c *cache) Increment(k string, n int64) error {
 		c.mu.Unlock()
 		return fmt.Errorf("Item %s not found", k)
 	}
-	if v.Expiration != emptyTime {
+	if v.Expiration != 0 {
 		c.sortedItems.Delete(v)
 	}
 	switch v.Object.(type) {
@@ -179,7 +197,7 @@ func (c *cache) Increment(k string, n int64) error {
 		return fmt.Errorf("The value for %s is not an integer", k)
 	}
 	c.items[k] = v
-	if v.Expiration != emptyTime {
+	if v.Expiration != 0 {
 		c.sortedItems.InsertNoReplace(v)
 	}
 	c.mu.Unlock()
@@ -885,7 +903,7 @@ func (c *cache) delete(k string) (interface{}, bool) {
 func (c *cache) DeleteExpired() {
 	var evictedItems []Item
 	c.mu.Lock()
-	c.sortedItems.DescendLessOrEqual(Item{Expiration: time.Now()}, func(i llrb.Item) bool {
+	c.sortedItems.DescendLessOrEqual(Item{Expiration: time.Now().UnixNano()}, func(i llrb.Item) bool {
 		v := i.(Item)
 		c.delete(v.Key)
 		evictedItems = append(evictedItems, v)	
@@ -902,13 +920,15 @@ func (c *cache) DeleteExpired() {
 	}	
 }
 
+
+
 // 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{})) {
 	c.mu.Lock()
-	defer c.mu.Unlock()
 	c.onEvicted = f
+	c.mu.Unlock()
 }
 
 // Write the cache's items (using Gob) to an io.Writer.
@@ -965,7 +985,12 @@ func (c *cache) Load(r io.Reader) error {
 			ov, found := c.items[k]
 			if !found || ov.Expired() {
 				c.items[k] = v
+				if found {
+					c.sortedItems.Delete(ov)
+				}
+				c.sortedItems.InsertNoReplace(v)
 			}
+	
 		}
 	}
 	return err
@@ -1013,6 +1038,7 @@ func (c *cache) ItemCount() int {
 func (c *cache) Flush() {
 	c.mu.Lock()
 	c.items = map[string]Item{}
+	c.sortedItems = llrb.New()
 	c.mu.Unlock()
 }
 
@@ -1055,16 +1081,16 @@ func newCache(de time.Duration, m map[string]Item) *cache {
 		defaultExpiration: de,
 		items:             m,
 	}
-	return c
-}
-
-func newCacheWithJanitor(de time.Duration, ci time.Duration, m map[string]Item) *Cache {
-	c := newCache(de, m)
 	c.sortedItems = llrb.New()
 	//we can probably do bulk insertion here to speed it up
 	for _, item := range m {
 		c.sortedItems.InsertNoReplace(item)
 	}
+	return c
+}
+
+func newCacheWithJanitor(de time.Duration, ci time.Duration, m map[string]Item) *Cache {
+	c := newCache(de, m)
 	// This trick ensures that the janitor goroutine (which--granted it
 	// was enabled--is running DeleteExpired on c forever) does not keep
 	// the returned C object from being garbage collected. When it is

cache_test.go

@@ -110,11 +110,11 @@ func TestNewFrom(t *testing.T) {
 	m := map[string]Item{
 		"a": Item{
 			Object:     1,
-			Expiration: emptyTime,
+			Expiration: 0,
 		},
 		"b": Item{
 			Object:     2,
-			Expiration: emptyTime,
+			Expiration: 0,
 		},
 	}
 	tc := NewFrom(DefaultExpiration, 0, m)
@@ -1425,9 +1425,17 @@ func TestSerializeUnserializable(t *testing.T) {
 	}
 }
 
-func BenchmarkCacheGet(b *testing.B) {
+func BenchmarkCacheGetExpiring(b *testing.B) {
+	benchmarkCacheGet(b, 5*time.Minute)
+}
+
+func BenchmarkCacheGetNotExpiring(b *testing.B) {
+	benchmarkCacheGet(b, NoExpiration)
+}
+
+func benchmarkCacheGet(b *testing.B, exp time.Duration) {
 	b.StopTimer()
-	tc := New(DefaultExpiration, 0)
+	tc := New(exp, 0)
 	tc.Set("foo", "bar", DefaultExpiration)
 	b.StartTimer()
 	for i := 0; i < b.N; i++ {
@@ -1449,9 +1457,17 @@ func BenchmarkRWMutexMapGet(b *testing.B) {
 	}
 }
 
-func BenchmarkCacheGetConcurrent(b *testing.B) {
+func BenchmarkCacheGetConcurrentExpiring(b *testing.B) {
+	benchmarkCacheGetConcurrent(b, 5*time.Minute)
+}
+
+func BenchmarkCacheGetConcurrentNotExpiring(b *testing.B) {
+	benchmarkCacheGetConcurrent(b, NoExpiration)
+}
+
+func benchmarkCacheGetConcurrent(b *testing.B, exp time.Duration) {
 	b.StopTimer()
-	tc := New(DefaultExpiration, 0)
+	tc := New(exp, 0)
 	tc.Set("foo", "bar", DefaultExpiration)
 	wg := new(sync.WaitGroup)
 	workers := runtime.NumCPU()
@@ -1493,13 +1509,21 @@ func BenchmarkRWMutexMapGetConcurrent(b *testing.B) {
 	wg.Wait()
 }
 
-func BenchmarkCacheGetManyConcurrent(b *testing.B) {
+func BenchmarkCacheGetManyConcurrentExpiring(b *testing.B) {
+	benchmarkCacheGetManyConcurrent(b, 5*time.Minute)
+}
+
+func BenchmarkCacheGetManyConcurrentNotExpiring(b *testing.B) {
+	benchmarkCacheGetManyConcurrent(b, NoExpiration)
+}
+
+func benchmarkCacheGetManyConcurrent(b *testing.B, exp time.Duration) {
 	// This is the same as BenchmarkCacheGetConcurrent, but its result
 	// can be compared against BenchmarkShardedCacheGetManyConcurrent
 	// in sharded_test.go.
 	b.StopTimer()
 	n := 10000
-	tc := New(DefaultExpiration, 0)
+	tc := New(exp, 0)
 	keys := make([]string, n)
 	for i := 0; i < n; i++ {
 		k := "foo" + strconv.Itoa(n)
@@ -1521,9 +1545,17 @@ func BenchmarkCacheGetManyConcurrent(b *testing.B) {
 	wg.Wait()
 }
 
-func BenchmarkCacheSet(b *testing.B) {
+func BenchmarkCacheSetExpiring(b *testing.B) {
+	benchmarkCacheSet(b, 5*time.Minute)
+}
+
+func BenchmarkCacheSetNotExpiring(b *testing.B) {
+	benchmarkCacheSet(b, NoExpiration)
+}
+
+func benchmarkCacheSet(b *testing.B, exp time.Duration) {
 	b.StopTimer()
-	tc := New(DefaultExpiration, 0)
+	tc := New(exp, 0)
 	b.StartTimer()
 	for i := 0; i < b.N; i++ {
 		tc.Set("foo", "bar", DefaultExpiration)
@@ -1602,9 +1634,9 @@ func BenchmarkIncrementInt(b *testing.B) {
 	}
 }
 
-func BenchmarkDeleteExpired(b *testing.B) {
+func BenchmarkDeleteExpiredLoop(b *testing.B) {
 	b.StopTimer()
-	tc := New(5 * time.Minute, 0)
+	tc := New(5*time.Minute, 0)
 	tc.mu.Lock()
 	for i := 0; i < 100000; i++ {
 		tc.set(strconv.Itoa(i), "bar", DefaultExpiration)
@@ -1618,13 +1650,20 @@ func BenchmarkDeleteExpired(b *testing.B) {
 
 func BenchmarkLargeCache(b *testing.B) {
 	b.StopTimer()
-	tc := New(100 * time.Millisecond, 1 * time.Millisecond)
+	tc := New(time.Second, 10*time.Millisecond)
-	//tc.mu.Lock()
+	end := time.Now().Add(tc.defaultExpiration)
+	var i int
+	for time.Now().Before(end) {
+		tc.Set(strconv.Itoa(i), "bar", DefaultExpiration)
+		i++
+	}
+	/*
 	for i := 0; i < 1000000; i++ {
 		tc.Set(strconv.Itoa(i), "bar", DefaultExpiration)
 	}
-	//tc.mu.Unlock()
+	*/
 	tc.DeleteExpired()
+	b.Logf("Cache size: %d", tc.ItemCount())
 	b.StartTimer()
 	for i := 1000000; i <1000000 + b.N; i++ {
 		tc.Set(strconv.Itoa(i), "bar", DefaultExpiration)

sharded_test.go

@@ -4,6 +4,7 @@ import (
 	"strconv"
 	"sync"
 	"testing"
+	"time"
 )
 
 // func TestDjb33(t *testing.T) {
@@ -32,9 +33,17 @@ func TestShardedCache(t *testing.T) {
 	}
 }
 
-func BenchmarkShardedCacheGet(b *testing.B) {
+func BenchmarkShardedCacheGetExpiring(b *testing.B) {
+	benchmarkShardedCacheGet(b, 5*time.Minute)
+}
+
+func BenchmarkShardedCacheGetNotExpiring(b *testing.B) {
+	benchmarkShardedCacheGet(b, NoExpiration)
+}
+
+func benchmarkShardedCacheGet(b *testing.B, exp time.Duration) {
 	b.StopTimer()
-	tc := unexportedNewSharded(DefaultExpiration, 0, 10)
+	tc := unexportedNewSharded(exp, 0, 10)
 	tc.Set("foobarba", "zquux", DefaultExpiration)
 	b.StartTimer()
 	for i := 0; i < b.N; i++ {
@@ -42,10 +51,18 @@ func BenchmarkShardedCacheGet(b *testing.B) {
 	}
 }
 
-func BenchmarkShardedCacheGetManyConcurrent(b *testing.B) {
+func BenchmarkShardedCacheGetManyConcurrentExpiring(b *testing.B) {
+	benchmarkShardedCacheGetManyConcurrent(b, 5*time.Minute)
+}
+
+func BenchmarkShardedCacheGetManyConcurrentNotExpiring(b *testing.B) {
+	benchmarkShardedCacheGetManyConcurrent(b, NoExpiration)
+}
+
+func benchmarkShardedCacheGetManyConcurrent(b *testing.B, exp time.Duration) {
 	b.StopTimer()
 	n := 10000
-	tsc := unexportedNewSharded(DefaultExpiration, 0, 20)
+	tsc := unexportedNewSharded(exp, 0, 20)
 	keys := make([]string, n)
 	for i := 0; i < n; i++ {
 		k := "foo" + strconv.Itoa(n)