[#5793] added subscriptions.Broker.TotalClients() method

tools/subscriptions/broker.go

@@ -30,6 +30,11 @@ func (b *Broker) ChunkedClients(chunkSize int) [][]Client {
 	return list.ToChunks(b.store.Values(), chunkSize)
 }
 
+// TotalClients returns the total number of registered clients.
+func (b *Broker) TotalClients() int {
+	return b.store.Length()
+}
+
 // ClientById finds a registered client by its id.
 //
 // Returns non-nil error when client with clientId is not registered.

tools/subscriptions/broker_test.go

@@ -62,6 +62,21 @@ func TestChunkedClients(t *testing.T) {
 	}
 }
 
+func TestTotalClients(t *testing.T) {
+	b := subscriptions.NewBroker()
+
+	if total := b.TotalClients(); total != 0 {
+		t.Fatalf("Expected no clients, got %d", total)
+	}
+
+	b.Register(subscriptions.NewDefaultClient())
+	b.Register(subscriptions.NewDefaultClient())
+
+	if total := b.TotalClients(); total != 2 {
+		t.Fatalf("Expected %d clients, got %d", 2, total)
+	}
+}
+
 func TestClientById(t *testing.T) {
 	b := subscriptions.NewBroker()