[FAB-9411] LazyRef finalizer should provide value

Added the currently set value as an argument to
the finalizer.

Change-Id: I17c7e497415c7a084f5c0cae275ed399aa56cd32
Signed-off-by: Bob Stasyszyn <Bob.Stasyszyn@securekey.com>

pkg/fabsdk/provider/fabpvdr/eventserviceref.go

@@ -148,7 +148,7 @@ func (ref *EventClientRef) initializer() lazyref.Initializer {
 }
 
 func (ref *EventClientRef) finalizer() lazyref.Finalizer {
-	return func() {
+	return func(interface{}) {
 		logger.Debug("Finalizer called")
 		if ref.eventClient != nil {
 			if ref.Closed() {

pkg/util/concurrent/lazyref/lazyref.go

@@ -24,7 +24,7 @@ type Initializer func() (interface{}, error)
 
 // Finalizer is a function that is called when the reference
 // is closed
-type Finalizer func()
+type Finalizer func(value interface{})
 
 // ExpirationProvider is a function that returns the
 // expiration time of a reference
@@ -316,8 +316,12 @@ func (r *Reference) finalize() {
 	}
 
 	r.lock.Lock()
-	r.finalizer()
-	r.lock.Unlock()
+	defer r.lock.Unlock()
+
+	if r.isSet() {
+		value, _ := r.get()
+		r.finalizer(value)
+	}
 }
 
 func (r *Reference) handleExpiration() {
@@ -334,7 +338,8 @@ func (r *Reference) handleExpiration() {
 // lock so there's no need to lock
 func (r *Reference) resetValue() {
 	if r.finalizer != nil {
-		r.finalizer()
+		value, _ := r.get()
+		r.finalizer(value)
 	}
 	atomic.StorePointer(&r.ref, nil)
 }

pkg/util/concurrent/lazyref/lazyref_test.go

@@ -12,6 +12,8 @@ import (
 	"sync/atomic"
 	"testing"
 	"time"
+
+	"github.com/stretchr/testify/assert"
 )
 
 func ExampleReference() {
@@ -169,9 +171,10 @@ func TestGetWithFinalizer(t *testing.T) {
 			return expectedValue, nil
 		},
 		WithFinalizer(
-			func() {
-				t.Logf("Finalizer called\n")
+			func(value interface{}) {
+				t.Logf("Finalizer called - value: %s\n", value)
 				atomic.AddInt32(&numTimesFinalized, 1)
+				assert.Equal(t, expectedValue, value, "got different value than expected in finalizer")
 			},
 		),
 	)
@@ -228,7 +231,7 @@ func TestExpiring(t *testing.T) {
 			return value, nil
 		},
 		WithFinalizer(
-			func() {
+			func(interface{}) {
 				atomic.AddInt32(&seq, 1)
 				atomic.AddInt32(&numTimesFinalized, 1)
 			},
@@ -299,7 +302,7 @@ func TestExpiringWithErr(t *testing.T) {
 			return value, nil
 		},
 		WithFinalizer(
-			func() {
+			func(interface{}) {
 				atomic.AddInt32(&numTimesFinalized, 1)
 				seq++
 			},
@@ -367,7 +370,7 @@ func TestExpiringOnIdle(t *testing.T) {
 			return value, nil
 		},
 		WithFinalizer(
-			func() {
+			func(interface{}) {
 				seq++
 				atomic.AddInt32(&numTimesFinalized, 1)
 			},
@@ -429,7 +432,7 @@ func TestProactiveRefresh(t *testing.T) {
 			return value, nil
 		},
 		WithFinalizer(
-			func() {
+			func(interface{}) {
 				atomic.AddInt32(&numTimesFinalized, 1)
 				t.Logf("Finalizer called")
 			},