Merge pull request #13632 from jiangyaoguo/create-new-cache-for-every-event-sink

Auto commit by PR queue bot

pkg/client/record/event.go

@@ -104,6 +104,7 @@ func (eventBroadcaster *eventBroadcasterImpl) StartRecordingToSink(sink EventSin
 	// The default math/rand package functions aren't thread safe, so create a
 	// new Rand object for each StartRecording call.
 	randGen := rand.New(rand.NewSource(time.Now().UnixNano()))
+	var eventCache *historyCache = NewEventCache()
 	return eventBroadcaster.StartEventWatcher(
 		func(event *api.Event) {
 			// Make a copy before modification, because there could be multiple listeners.
@@ -111,7 +112,7 @@ func (eventBroadcaster *eventBroadcasterImpl) StartRecordingToSink(sink EventSin
 			eventCopy := *event
 			event = &eventCopy
 
-			previousEvent := getEvent(event)
+			previousEvent := eventCache.getEvent(event)
 			updateExistingEvent := previousEvent.Count > 0
 			if updateExistingEvent {
 				event.Count = previousEvent.Count + 1
@@ -122,7 +123,7 @@ func (eventBroadcaster *eventBroadcasterImpl) StartRecordingToSink(sink EventSin
 
 			tries := 0
 			for {
-				if recordEvent(sink, event, updateExistingEvent) {
+				if recordEvent(sink, event, updateExistingEvent, eventCache) {
 					break
 				}
 				tries++
@@ -156,7 +157,7 @@ func isKeyNotFoundError(err error) bool {
 // was successfully recorded or discarded, false if it should be retried.
 // If updateExistingEvent is false, it creates a new event, otherwise it updates
 // existing event.
-func recordEvent(sink EventSink, event *api.Event, updateExistingEvent bool) bool {
+func recordEvent(sink EventSink, event *api.Event, updateExistingEvent bool, eventCache *historyCache) bool {
 	var newEvent *api.Event
 	var err error
 	if updateExistingEvent {
@@ -169,7 +170,7 @@ func recordEvent(sink EventSink, event *api.Event, updateExistingEvent bool) boo
 		newEvent, err = sink.Create(event)
 	}
 	if err == nil {
-		addOrUpdateEvent(newEvent)
+		eventCache.addOrUpdateEvent(newEvent)
 		return true
 	}
 

pkg/client/record/event_test.go

@@ -21,7 +21,6 @@ import (
 	"reflect"
 	"strconv"
 	"strings"
-	"sync"
 	"testing"
 
 	"k8s.io/kubernetes/pkg/api"
@@ -271,78 +270,81 @@ func TestEventf(t *testing.T) {
 		},
 	}
 
+	logCalled := make(chan struct{})
+	createEvent := make(chan *api.Event)
+	updateEvent := make(chan *api.Event)
+	testEvents := testEventSink{
+		OnCreate: func(event *api.Event) (*api.Event, error) {
+			createEvent <- event
+			return event, nil
+		},
+		OnUpdate: func(event *api.Event) (*api.Event, error) {
+			updateEvent <- event
+			return event, nil
+		},
+	}
+	eventBroadcaster := NewBroadcaster()
+	sinkWatcher := eventBroadcaster.StartRecordingToSink(&testEvents)
+
+	recorder := eventBroadcaster.NewRecorder(api.EventSource{Component: "eventTest"})
 	for _, item := range table {
-		var wg sync.WaitGroup
-		// We expect only one callback
-		wg.Add(1)
-		testEvents := testEventSink{
-			OnCreate: func(event *api.Event) (*api.Event, error) {
-				defer wg.Done()
-				returnEvent, _ := validateEvent(event, item.expect, t)
-				if item.expectUpdate {
-					t.Errorf("Expected event update(), got event create()")
-				}
-				return returnEvent, nil
-			},
-			OnUpdate: func(event *api.Event) (*api.Event, error) {
-				defer wg.Done()
-				returnEvent, _ := validateEvent(event, item.expect, t)
-				if !item.expectUpdate {
-					t.Errorf("Expected event create(), got event update()")
-				}
-				return returnEvent, nil
-			},
-		}
-		eventBroadcaster := NewBroadcaster()
-		sinkWatcher := eventBroadcaster.StartRecordingToSink(&testEvents)
 		logWatcher1 := eventBroadcaster.StartLogging(t.Logf) // Prove that it is useful
-		wg.Add(1)
 		logWatcher2 := eventBroadcaster.StartLogging(func(formatter string, args ...interface{}) {
-			defer wg.Done()
 			if e, a := item.expectLog, fmt.Sprintf(formatter, args...); e != a {
 				t.Errorf("Expected '%v', got '%v'", e, a)
 			}
+			logCalled <- struct{}{}
 		})
-		recorder := eventBroadcaster.NewRecorder(api.EventSource{Component: "eventTest"})
 		recorder.Eventf(item.obj, item.reason, item.messageFmt, item.elements...)
 
-		wg.Wait()
+		<-logCalled
-		sinkWatcher.Stop()
+
+		// validate event
+		if item.expectUpdate {
+			actualEvent := <-updateEvent
+			validateEvent(actualEvent, item.expect, t)
+		} else {
+			actualEvent := <-createEvent
+			validateEvent(actualEvent, item.expect, t)
+		}
 		logWatcher1.Stop()
 		logWatcher2.Stop()
 	}
+	sinkWatcher.Stop()
 }
 
 func validateEvent(actualEvent *api.Event, expectedEvent *api.Event, t *testing.T) (*api.Event, error) {
+	recvEvent := *actualEvent
 	expectCompression := expectedEvent.Count > 1
+	t.Logf("expectedEvent.Count is %d\n", expectedEvent.Count)
 	// Just check that the timestamp was set.
-	if actualEvent.FirstTimestamp.IsZero() || actualEvent.LastTimestamp.IsZero() {
+	if recvEvent.FirstTimestamp.IsZero() || recvEvent.LastTimestamp.IsZero() {
-		t.Errorf("timestamp wasn't set: %#v", *actualEvent)
+		t.Errorf("timestamp wasn't set: %#v", recvEvent)
 	}
-	actualFirstTimestamp := actualEvent.FirstTimestamp
+	actualFirstTimestamp := recvEvent.FirstTimestamp
-	actualLastTimestamp := actualEvent.LastTimestamp
+	actualLastTimestamp := recvEvent.LastTimestamp
 	if actualFirstTimestamp.Equal(actualLastTimestamp) {
 		if expectCompression {
-			t.Errorf("FirstTimestamp (%q) and LastTimestamp (%q) must be different to indicate event compression happened, but were the same. Actual Event: %#v", actualFirstTimestamp, actualLastTimestamp, *actualEvent)
+			t.Errorf("FirstTimestamp (%q) and LastTimestamp (%q) must be different to indicate event compression happened, but were the same. Actual Event: %#v", actualFirstTimestamp, actualLastTimestamp, recvEvent)
 		}
 	} else {
 		if expectedEvent.Count == 1 {
-			t.Errorf("FirstTimestamp (%q) and LastTimestamp (%q) must be equal to indicate only one occurrence of the event, but were different. Actual Event: %#v", actualFirstTimestamp, actualLastTimestamp, *actualEvent)
+			t.Errorf("FirstTimestamp (%q) and LastTimestamp (%q) must be equal to indicate only one occurrence of the event, but were different. Actual Event: %#v", actualFirstTimestamp, actualLastTimestamp, recvEvent)
 		}
 	}
 	// Temp clear time stamps for comparison because actual values don't matter for comparison
-	actualEvent.FirstTimestamp = expectedEvent.FirstTimestamp
+	recvEvent.FirstTimestamp = expectedEvent.FirstTimestamp
-	actualEvent.LastTimestamp = expectedEvent.LastTimestamp
+	recvEvent.LastTimestamp = expectedEvent.LastTimestamp
 	// Check that name has the right prefix.
-	if n, en := actualEvent.Name, expectedEvent.Name; !strings.HasPrefix(n, en) {
+	if n, en := recvEvent.Name, expectedEvent.Name; !strings.HasPrefix(n, en) {
 		t.Errorf("Name '%v' does not contain prefix '%v'", n, en)
 	}
-	actualEvent.Name = expectedEvent.Name
+	recvEvent.Name = expectedEvent.Name
-	if e, a := expectedEvent, actualEvent; !reflect.DeepEqual(e, a) {
+	if e, a := expectedEvent, &recvEvent; !reflect.DeepEqual(e, a) {
 		t.Errorf("diff: %s", util.ObjectGoPrintDiff(e, a))
 	}
-	actualEvent.FirstTimestamp = actualFirstTimestamp
+	recvEvent.FirstTimestamp = actualFirstTimestamp
-	actualEvent.LastTimestamp = actualLastTimestamp
+	recvEvent.LastTimestamp = actualLastTimestamp
 	return actualEvent, nil
 }
 
@@ -526,42 +528,323 @@ func TestEventfNoNamespace(t *testing.T) {
 		},
 	}
 
+	logCalled := make(chan struct{})
+	createEvent := make(chan *api.Event)
+	updateEvent := make(chan *api.Event)
+	testEvents := testEventSink{
+		OnCreate: func(event *api.Event) (*api.Event, error) {
+			createEvent <- event
+			return event, nil
+		},
+		OnUpdate: func(event *api.Event) (*api.Event, error) {
+			updateEvent <- event
+			return event, nil
+		},
+	}
+	eventBroadcaster := NewBroadcaster()
+	sinkWatcher := eventBroadcaster.StartRecordingToSink(&testEvents)
+
+	recorder := eventBroadcaster.NewRecorder(api.EventSource{Component: "eventTest"})
+
 	for _, item := range table {
-		called := make(chan struct{})
-		testEvents := testEventSink{
-			OnCreate: func(event *api.Event) (*api.Event, error) {
-				returnEvent, _ := validateEvent(event, item.expect, t)
-				if item.expectUpdate {
-					t.Errorf("Expected event update(), got event create()")
-				}
-				called <- struct{}{}
-				return returnEvent, nil
-			},
-			OnUpdate: func(event *api.Event) (*api.Event, error) {
-				returnEvent, _ := validateEvent(event, item.expect, t)
-				if !item.expectUpdate {
-					t.Errorf("Expected event create(), got event update()")
-				}
-				called <- struct{}{}
-				return returnEvent, nil
-			},
-		}
-		eventBroadcaster := NewBroadcaster()
-		sinkWatcher := eventBroadcaster.StartRecordingToSink(&testEvents)
 		logWatcher1 := eventBroadcaster.StartLogging(t.Logf) // Prove that it is useful
 		logWatcher2 := eventBroadcaster.StartLogging(func(formatter string, args ...interface{}) {
 			if e, a := item.expectLog, fmt.Sprintf(formatter, args...); e != a {
 				t.Errorf("Expected '%v', got '%v'", e, a)
 			}
-			called <- struct{}{}
+			logCalled <- struct{}{}
 		})
-		recorder := eventBroadcaster.NewRecorder(api.EventSource{Component: "eventTest"})
 		recorder.Eventf(item.obj, item.reason, item.messageFmt, item.elements...)
 
-		<-called
+		<-logCalled
-		<-called
+
-		sinkWatcher.Stop()
+		// validate event
+		if item.expectUpdate {
+			actualEvent := <-updateEvent
+			validateEvent(actualEvent, item.expect, t)
+		} else {
+			actualEvent := <-createEvent
+			validateEvent(actualEvent, item.expect, t)
+		}
+
 		logWatcher1.Stop()
 		logWatcher2.Stop()
 	}
+	sinkWatcher.Stop()
+}
+
+func TestMultiSinkCache(t *testing.T) {
+	testPod := &api.Pod{
+		ObjectMeta: api.ObjectMeta{
+			SelfLink:  "/api/version/pods/foo",
+			Name:      "foo",
+			Namespace: "baz",
+			UID:       "bar",
+		},
+	}
+	testPod2 := &api.Pod{
+		ObjectMeta: api.ObjectMeta{
+			SelfLink:  "/api/version/pods/foo",
+			Name:      "foo",
+			Namespace: "baz",
+			UID:       "differentUid",
+		},
+	}
+	testRef, err := api.GetPartialReference(testPod, "spec.containers[2]")
+	testRef2, err := api.GetPartialReference(testPod2, "spec.containers[3]")
+	if err != nil {
+		t.Fatal(err)
+	}
+	table := []struct {
+		obj          runtime.Object
+		reason       string
+		messageFmt   string
+		elements     []interface{}
+		expect       *api.Event
+		expectLog    string
+		expectUpdate bool
+	}{
+		{
+			obj:        testRef,
+			reason:     "Started",
+			messageFmt: "some verbose message: %v",
+			elements:   []interface{}{1},
+			expect: &api.Event{
+				ObjectMeta: api.ObjectMeta{
+					Name:      "foo",
+					Namespace: "baz",
+				},
+				InvolvedObject: api.ObjectReference{
+					Kind:       "Pod",
+					Name:       "foo",
+					Namespace:  "baz",
+					UID:        "bar",
+					APIVersion: "version",
+					FieldPath:  "spec.containers[2]",
+				},
+				Reason:  "Started",
+				Message: "some verbose message: 1",
+				Source:  api.EventSource{Component: "eventTest"},
+				Count:   1,
+			},
+			expectLog:    `Event(api.ObjectReference{Kind:"Pod", Namespace:"baz", Name:"foo", UID:"bar", APIVersion:"version", ResourceVersion:"", FieldPath:"spec.containers[2]"}): reason: 'Started' some verbose message: 1`,
+			expectUpdate: false,
+		},
+		{
+			obj:        testPod,
+			reason:     "Killed",
+			messageFmt: "some other verbose message: %v",
+			elements:   []interface{}{1},
+			expect: &api.Event{
+				ObjectMeta: api.ObjectMeta{
+					Name:      "foo",
+					Namespace: "baz",
+				},
+				InvolvedObject: api.ObjectReference{
+					Kind:       "Pod",
+					Name:       "foo",
+					Namespace:  "baz",
+					UID:        "bar",
+					APIVersion: "version",
+				},
+				Reason:  "Killed",
+				Message: "some other verbose message: 1",
+				Source:  api.EventSource{Component: "eventTest"},
+				Count:   1,
+			},
+			expectLog:    `Event(api.ObjectReference{Kind:"Pod", Namespace:"baz", Name:"foo", UID:"bar", APIVersion:"version", ResourceVersion:"", FieldPath:""}): reason: 'Killed' some other verbose message: 1`,
+			expectUpdate: false,
+		},
+		{
+			obj:        testRef,
+			reason:     "Started",
+			messageFmt: "some verbose message: %v",
+			elements:   []interface{}{1},
+			expect: &api.Event{
+				ObjectMeta: api.ObjectMeta{
+					Name:      "foo",
+					Namespace: "baz",
+				},
+				InvolvedObject: api.ObjectReference{
+					Kind:       "Pod",
+					Name:       "foo",
+					Namespace:  "baz",
+					UID:        "bar",
+					APIVersion: "version",
+					FieldPath:  "spec.containers[2]",
+				},
+				Reason:  "Started",
+				Message: "some verbose message: 1",
+				Source:  api.EventSource{Component: "eventTest"},
+				Count:   2,
+			},
+			expectLog:    `Event(api.ObjectReference{Kind:"Pod", Namespace:"baz", Name:"foo", UID:"bar", APIVersion:"version", ResourceVersion:"", FieldPath:"spec.containers[2]"}): reason: 'Started' some verbose message: 1`,
+			expectUpdate: true,
+		},
+		{
+			obj:        testRef2,
+			reason:     "Started",
+			messageFmt: "some verbose message: %v",
+			elements:   []interface{}{1},
+			expect: &api.Event{
+				ObjectMeta: api.ObjectMeta{
+					Name:      "foo",
+					Namespace: "baz",
+				},
+				InvolvedObject: api.ObjectReference{
+					Kind:       "Pod",
+					Name:       "foo",
+					Namespace:  "baz",
+					UID:        "differentUid",
+					APIVersion: "version",
+					FieldPath:  "spec.containers[3]",
+				},
+				Reason:  "Started",
+				Message: "some verbose message: 1",
+				Source:  api.EventSource{Component: "eventTest"},
+				Count:   1,
+			},
+			expectLog:    `Event(api.ObjectReference{Kind:"Pod", Namespace:"baz", Name:"foo", UID:"differentUid", APIVersion:"version", ResourceVersion:"", FieldPath:"spec.containers[3]"}): reason: 'Started' some verbose message: 1`,
+			expectUpdate: false,
+		},
+		{
+			obj:        testRef,
+			reason:     "Started",
+			messageFmt: "some verbose message: %v",
+			elements:   []interface{}{1},
+			expect: &api.Event{
+				ObjectMeta: api.ObjectMeta{
+					Name:      "foo",
+					Namespace: "baz",
+				},
+				InvolvedObject: api.ObjectReference{
+					Kind:       "Pod",
+					Name:       "foo",
+					Namespace:  "baz",
+					UID:        "bar",
+					APIVersion: "version",
+					FieldPath:  "spec.containers[2]",
+				},
+				Reason:  "Started",
+				Message: "some verbose message: 1",
+				Source:  api.EventSource{Component: "eventTest"},
+				Count:   3,
+			},
+			expectLog:    `Event(api.ObjectReference{Kind:"Pod", Namespace:"baz", Name:"foo", UID:"bar", APIVersion:"version", ResourceVersion:"", FieldPath:"spec.containers[2]"}): reason: 'Started' some verbose message: 1`,
+			expectUpdate: true,
+		},
+		{
+			obj:        testRef2,
+			reason:     "Stopped",
+			messageFmt: "some verbose message: %v",
+			elements:   []interface{}{1},
+			expect: &api.Event{
+				ObjectMeta: api.ObjectMeta{
+					Name:      "foo",
+					Namespace: "baz",
+				},
+				InvolvedObject: api.ObjectReference{
+					Kind:       "Pod",
+					Name:       "foo",
+					Namespace:  "baz",
+					UID:        "differentUid",
+					APIVersion: "version",
+					FieldPath:  "spec.containers[3]",
+				},
+				Reason:  "Stopped",
+				Message: "some verbose message: 1",
+				Source:  api.EventSource{Component: "eventTest"},
+				Count:   1,
+			},
+			expectLog:    `Event(api.ObjectReference{Kind:"Pod", Namespace:"baz", Name:"foo", UID:"differentUid", APIVersion:"version", ResourceVersion:"", FieldPath:"spec.containers[3]"}): reason: 'Stopped' some verbose message: 1`,
+			expectUpdate: false,
+		},
+		{
+			obj:        testRef2,
+			reason:     "Stopped",
+			messageFmt: "some verbose message: %v",
+			elements:   []interface{}{1},
+			expect: &api.Event{
+				ObjectMeta: api.ObjectMeta{
+					Name:      "foo",
+					Namespace: "baz",
+				},
+				InvolvedObject: api.ObjectReference{
+					Kind:       "Pod",
+					Name:       "foo",
+					Namespace:  "baz",
+					UID:        "differentUid",
+					APIVersion: "version",
+					FieldPath:  "spec.containers[3]",
+				},
+				Reason:  "Stopped",
+				Message: "some verbose message: 1",
+				Source:  api.EventSource{Component: "eventTest"},
+				Count:   2,
+			},
+			expectLog:    `Event(api.ObjectReference{Kind:"Pod", Namespace:"baz", Name:"foo", UID:"differentUid", APIVersion:"version", ResourceVersion:"", FieldPath:"spec.containers[3]"}): reason: 'Stopped' some verbose message: 1`,
+			expectUpdate: true,
+		},
+	}
+
+	createEvent := make(chan *api.Event)
+	updateEvent := make(chan *api.Event)
+	testEvents := testEventSink{
+		OnCreate: func(event *api.Event) (*api.Event, error) {
+			createEvent <- event
+			return event, nil
+		},
+		OnUpdate: func(event *api.Event) (*api.Event, error) {
+			updateEvent <- event
+			return event, nil
+		},
+	}
+
+	createEvent2 := make(chan *api.Event)
+	updateEvent2 := make(chan *api.Event)
+	testEvents2 := testEventSink{
+		OnCreate: func(event *api.Event) (*api.Event, error) {
+			createEvent2 <- event
+			return event, nil
+		},
+		OnUpdate: func(event *api.Event) (*api.Event, error) {
+			updateEvent2 <- event
+			return event, nil
+		},
+	}
+
+	eventBroadcaster := NewBroadcaster()
+	recorder := eventBroadcaster.NewRecorder(api.EventSource{Component: "eventTest"})
+
+	sinkWatcher := eventBroadcaster.StartRecordingToSink(&testEvents)
+	for _, item := range table {
+		recorder.Eventf(item.obj, item.reason, item.messageFmt, item.elements...)
+
+		// validate event
+		if item.expectUpdate {
+			actualEvent := <-updateEvent
+			validateEvent(actualEvent, item.expect, t)
+		} else {
+			actualEvent := <-createEvent
+			validateEvent(actualEvent, item.expect, t)
+		}
+	}
+
+	// Another StartRecordingToSink call should start to record events with new clean cache.
+	sinkWatcher2 := eventBroadcaster.StartRecordingToSink(&testEvents2)
+	for _, item := range table {
+		recorder.Eventf(item.obj, item.reason, item.messageFmt, item.elements...)
+
+		// validate event
+		if item.expectUpdate {
+			actualEvent := <-updateEvent2
+			validateEvent(actualEvent, item.expect, t)
+		} else {
+			actualEvent := <-createEvent2
+			validateEvent(actualEvent, item.expect, t)
+		}
+	}
+
+	sinkWatcher.Stop()
+	sinkWatcher2.Stop()
 }

pkg/client/record/events_cache.go

@@ -47,15 +47,17 @@ type historyCache struct {
 	cache *lru.Cache
 }
 
-var previousEvents = historyCache{cache: lru.New(maxLruCacheEntries)}
+func NewEventCache() *historyCache {
+	return &historyCache{cache: lru.New(maxLruCacheEntries)}
+}
 
 // addOrUpdateEvent creates a new entry for the given event in the previous events hash table if the event
 // doesn't already exist, otherwise it updates the existing entry.
-func addOrUpdateEvent(newEvent *api.Event) history {
+func (eventCache *historyCache) addOrUpdateEvent(newEvent *api.Event) history {
 	key := getEventKey(newEvent)
-	previousEvents.Lock()
+	eventCache.Lock()
-	defer previousEvents.Unlock()
+	defer eventCache.Unlock()
-	previousEvents.cache.Add(
+	eventCache.cache.Add(
 		key,
 		history{
 			Count:           newEvent.Count,
@@ -63,20 +65,20 @@ func addOrUpdateEvent(newEvent *api.Event) history {
 			Name:            newEvent.Name,
 			ResourceVersion: newEvent.ResourceVersion,
 		})
-	return getEventFromCache(key)
+	return eventCache.getEventFromCache(key)
 }
 
 // getEvent returns the entry corresponding to the given event, if one exists, otherwise a history object
 // with a count of 0 is returned.
-func getEvent(event *api.Event) history {
+func (eventCache *historyCache) getEvent(event *api.Event) history {
 	key := getEventKey(event)
-	previousEvents.RLock()
+	eventCache.RLock()
-	defer previousEvents.RUnlock()
+	defer eventCache.RUnlock()
-	return getEventFromCache(key)
+	return eventCache.getEventFromCache(key)
 }
 
-func getEventFromCache(key string) history {
+func (eventCache *historyCache) getEventFromCache(key string) history {
-	value, ok := previousEvents.cache.Get(key)
+	value, ok := eventCache.cache.Get(key)
 	if ok {
 		historyValue, ok := value.(history)
 		if ok {

pkg/client/record/events_cache_test.go

@@ -25,6 +25,7 @@ import (
 
 func TestAddOrUpdateEventNoExisting(t *testing.T) {
 	// Arrange
+	eventCache := NewEventCache()
 	eventTime := unversioned.Now()
 	event := api.Event{
 		Reason:  "my reasons are many",
@@ -46,7 +47,7 @@ func TestAddOrUpdateEventNoExisting(t *testing.T) {
 	}
 
 	// Act
-	result := addOrUpdateEvent(&event)
+	result := eventCache.addOrUpdateEvent(&event)
 
 	// Assert
 	compareEventWithHistoryEntry(&event, &result, t)
@@ -54,6 +55,7 @@ func TestAddOrUpdateEventNoExisting(t *testing.T) {
 
 func TestAddOrUpdateEventExisting(t *testing.T) {
 	// Arrange
+	eventCache := NewEventCache()
 	event1Time := unversioned.Unix(2324, 2342)
 	event2Time := unversioned.Now()
 	event1 := api.Event{
@@ -100,9 +102,9 @@ func TestAddOrUpdateEventExisting(t *testing.T) {
 	}
 
 	// Act
-	addOrUpdateEvent(&event1)
+	eventCache.addOrUpdateEvent(&event1)
-	result1 := addOrUpdateEvent(&event2)
+	result1 := eventCache.addOrUpdateEvent(&event2)
-	result2 := getEvent(&event1)
+	result2 := eventCache.getEvent(&event1)
 
 	// Assert
 	compareEventWithHistoryEntry(&event2, &result1, t)
@@ -111,6 +113,7 @@ func TestAddOrUpdateEventExisting(t *testing.T) {
 
 func TestGetEventNoExisting(t *testing.T) {
 	// Arrange
+	eventCache := NewEventCache()
 	event := api.Event{
 		Reason:  "to be or not to be",
 		Message: "do I exist",
@@ -129,7 +132,7 @@ func TestGetEventNoExisting(t *testing.T) {
 	}
 
 	// Act
-	existingEvent := getEvent(&event)
+	existingEvent := eventCache.getEvent(&event)
 
 	// Assert
 	if existingEvent.Count != 0 {
@@ -139,6 +142,7 @@ func TestGetEventNoExisting(t *testing.T) {
 
 func TestGetEventExisting(t *testing.T) {
 	// Arrange
+	eventCache := NewEventCache()
 	eventTime := unversioned.Now()
 	event := api.Event{
 		Reason:  "do I exist",
@@ -158,10 +162,10 @@ func TestGetEventExisting(t *testing.T) {
 		FirstTimestamp: eventTime,
 		LastTimestamp:  eventTime,
 	}
-	addOrUpdateEvent(&event)
+	eventCache.addOrUpdateEvent(&event)
 
 	// Act
-	existingEvent := getEvent(&event)
+	existingEvent := eventCache.getEvent(&event)
 
 	// Assert
 	compareEventWithHistoryEntry(&event, &existingEvent, t)