Move atomic_value.go into folder

pkg/kubelet/kubelet.go

@@ -66,6 +66,7 @@ import (
 	"k8s.io/kubernetes/pkg/securitycontext"
 	"k8s.io/kubernetes/pkg/types"
 	"k8s.io/kubernetes/pkg/util"
+	"k8s.io/kubernetes/pkg/util/atomic"
 	"k8s.io/kubernetes/pkg/util/bandwidth"
 	"k8s.io/kubernetes/pkg/util/chmod"
 	"k8s.io/kubernetes/pkg/util/chown"
@@ -324,7 +325,7 @@ func NewMainKubelet(
 		configureCBR0:                  configureCBR0,
 		reconcileCIDR:                  reconcileCIDR,
 		maxPods:                        maxPods,
-		syncLoopMonitor:                util.AtomicValue{},
+		syncLoopMonitor:                atomic.Value{},
 		resolverConfig:                 resolverConfig,
 		cpuCFSQuota:                    cpuCFSQuota,
 		daemonEndpoints:                daemonEndpoints,
@@ -635,7 +636,7 @@ type Kubelet struct {
 	maxPods int
 
 	// Monitor Kubelet's sync loop
-	syncLoopMonitor util.AtomicValue
+	syncLoopMonitor atomic.Value
 
 	// Container restart Backoff
 	backOff *util.Backoff

pkg/storage/etcd/etcd_watcher.go

@@ -19,6 +19,7 @@ package etcd
 import (
 	"net/http"
 	"sync"
+	"sync/atomic"
 	"time"
 
 	"k8s.io/kubernetes/pkg/api/unversioned"
@@ -42,6 +43,23 @@ const (
 	EtcdExpire = "expire"
 )
 
+// HighWaterMark is a thread-safe object for tracking the maximum value seen
+// for some quantity.
+type HighWaterMark int64
+
+// Update returns true if and only if 'current' is the highest value ever seen.
+func (hwm *HighWaterMark) Update(current int64) bool {
+	for {
+		old := atomic.LoadInt64((*int64)(hwm))
+		if current <= old {
+			return false
+		}
+		if atomic.CompareAndSwapInt64((*int64)(hwm), old, current) {
+			return true
+		}
+	}
+}
+
 // TransformFunc attempts to convert an object to another object for use with a watcher.
 type TransformFunc func(runtime.Object) (runtime.Object, error)
 
@@ -169,7 +187,7 @@ func convertRecursiveResponse(node *etcd.Node, response *etcd.Response, incoming
 }
 
 var (
-	watchChannelHWM util.HighWaterMark
+	watchChannelHWM HighWaterMark
 )
 
 // translate pulls stuff from etcd, converts, and pushes out the outgoing channel. Meant to be
@@ -214,7 +232,7 @@ func (w *etcdWatcher) translate() {
 			return
 		case res, ok := <-w.etcdIncoming:
 			if ok {
-				if curLen := int64(len(w.etcdIncoming)); watchChannelHWM.Check(curLen) {
+				if curLen := int64(len(w.etcdIncoming)); watchChannelHWM.Update(curLen) {
 					// Monitor if this gets backed up, and how much.
 					glog.V(2).Infof("watch: %v objects queued in channel.", curLen)
 				}

pkg/storage/etcd/etcd_watcher_test.go

@@ -17,7 +17,9 @@ limitations under the License.
 package etcd
 
 import (
+	"math/rand"
 	rt "runtime"
+	"sync"
 	"testing"
 
 	"github.com/coreos/go-etcd/etcd"
@@ -463,3 +465,34 @@ func TestWatchPurposefulShutdown(t *testing.T) {
 		t.Errorf("Channel should be closed")
 	}
 }
+
+func TestHighWaterMark(t *testing.T) {
+	var h HighWaterMark
+
+	for i := int64(10); i < 20; i++ {
+		if !h.Update(i) {
+			t.Errorf("unexpected false for %v", i)
+		}
+		if h.Update(i - 1) {
+			t.Errorf("unexpected true for %v", i-1)
+		}
+	}
+
+	m := int64(0)
+	wg := sync.WaitGroup{}
+	for i := 0; i < 300; i++ {
+		wg.Add(1)
+		v := rand.Int63()
+		go func(v int64) {
+			defer wg.Done()
+			h.Update(v)
+		}(v)
+		if v > m {
+			m = v
+		}
+	}
+	wg.Wait()
+	if m != int64(h) {
+		t.Errorf("unexpected value, wanted %v, got %v", m, int64(h))
+	}
+}

pkg/util/atomic_value.go → pkg/util/atomic/value.go

@@ -14,47 +14,29 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-package util
+package atomic
 
 import (
 	"sync"
-	"sync/atomic"
 )
 
 // TODO(ArtfulCoder)
 // sync/atomic/Value was added in golang 1.4
 // Once support is dropped for go 1.3, this type must be deprecated in favor of sync/atomic/Value.
 // The functions are named Load/Store to match sync/atomic/Value function names.
-type AtomicValue struct {
+type Value struct {
 	value      interface{}
 	valueMutex sync.RWMutex
 }
 
-func (at *AtomicValue) Store(val interface{}) {
+func (at *Value) Store(val interface{}) {
 	at.valueMutex.Lock()
 	defer at.valueMutex.Unlock()
 	at.value = val
 }
 
-func (at *AtomicValue) Load() interface{} {
+func (at *Value) Load() interface{} {
 	at.valueMutex.RLock()
 	defer at.valueMutex.RUnlock()
 	return at.value
 }
-
-// HighWaterMark is a thread-safe object for tracking the maximum value seen
-// for some quantity.
-type HighWaterMark int64
-
-// Check returns true if and only if 'current' is the highest value ever seen.
-func (hwm *HighWaterMark) Check(current int64) bool {
-	for {
-		old := atomic.LoadInt64((*int64)(hwm))
-		if current <= old {
-			return false
-		}
-		if atomic.CompareAndSwapInt64((*int64)(hwm), old, current) {
-			return true
-		}
-	}
-}

pkg/util/atomic_value_test.go → pkg/util/atomic/value_test.go

@@ -14,16 +14,16 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-package util
+package atomic
 
 import (
-	"math/rand"
-	"sync"
 	"testing"
 	"time"
+
+	"k8s.io/kubernetes/pkg/util"
 )
 
-func ExpectValue(t *testing.T, atomicValue *AtomicValue, expectedValue interface{}) {
+func ExpectValue(t *testing.T, atomicValue *Value, expectedValue interface{}) {
 	actualValue := atomicValue.Load()
 	if actualValue != expectedValue {
 		t.Errorf("Expected to find %v, found %v", expectedValue, actualValue)
@@ -38,46 +38,15 @@ func ExpectValue(t *testing.T, atomicValue *AtomicValue, expectedValue interface
 			t.Errorf("Expected to find %v, found %v", expectedValue, actualValue)
 			return
 		}
-	case <-time.After(ForeverTestTimeout):
+	case <-time.After(util.ForeverTestTimeout):
 		t.Error("Value could not be read")
 		return
 	}
 }
 
 func TestAtomicValue(t *testing.T) {
-	atomicValue := &AtomicValue{}
+	atomicValue := &Value{}
 	ExpectValue(t, atomicValue, nil)
 	atomicValue.Store(10)
 	ExpectValue(t, atomicValue, 10)
 }
-
-func TestHighWaterMark(t *testing.T) {
-	var h HighWaterMark
-
-	for i := int64(10); i < 20; i++ {
-		if !h.Check(i) {
-			t.Errorf("unexpected false for %v", i)
-		}
-		if h.Check(i - 1) {
-			t.Errorf("unexpected true for %v", i-1)
-		}
-	}
-
-	m := int64(0)
-	wg := sync.WaitGroup{}
-	for i := 0; i < 300; i++ {
-		wg.Add(1)
-		v := rand.Int63()
-		go func(v int64) {
-			defer wg.Done()
-			h.Check(v)
-		}(v)
-		if v > m {
-			m = v
-		}
-	}
-	wg.Wait()
-	if m != int64(h) {
-		t.Errorf("unexpected value, wanted %v, got %v", m, int64(h))
-	}
-}