Fix BUG: negative wait group count

registry/protocol/protocol.go

@@ -338,10 +338,10 @@ func setProviderUrl(regURL *common.URL, providerURL *common.URL) {
 }
 
 func GetProtocol() protocol.Protocol {
-	if regProtocol != nil {
-		return regProtocol
+	if regProtocol == nil {
+		regProtocol = newRegistryProtocol()
 	}
-	return newRegistryProtocol()
+	return regProtocol
 }
 
 type wrappedInvoker struct {

registry/protocol/protocol_test.go

@@ -291,3 +291,8 @@ func TestExportWithApplicationConfig(t *testing.T) {
 	v2, _ := regProtocol.bounds.Load(getCacheKey(newUrl))
 	assert.NotNil(t, v2)
 }
+
+func TestGetProtocol(t *testing.T) {
+	singleton := GetProtocol()
+	assert.True(t, singleton == GetProtocol())
+}

registry/zookeeper/listener.go

@@ -109,7 +109,7 @@ func (l *RegistryConfigurationListener) Next() (*registry.ServiceEvent, error) {
 	}
 }
 func (l *RegistryConfigurationListener) Close() {
-	l.registry.wg.Done()
+	l.client.Close()
 }
 
 func (l *RegistryConfigurationListener) valid() bool {