Web MIDI: distributes MIDIPort information asynchronously

media/midi/midi_manager.h

Index: media/midi/midi_manager.h
diff --git a/media/midi/midi_manager.h b/media/midi/midi_manager.h
index 1e2bcb8dc793ae76ecb5d1787ffb541ec6f9b6f8..d7e7e47a1a65ce38497b316a080c396df21d1068 100644
--- a/media/midi/midi_manager.h
+++ b/media/midi/midi_manager.h
@@ -29,6 +29,17 @@ class MEDIA_EXPORT MidiManagerClient {
  public:
   virtual ~MidiManagerClient() {}
 
+  // AddInputPort() and AddOutputPort() are called before CompleteStartSession()
+  // is called to notify existing MIDI ports, and also called after that to
+  // notify new MIDI ports are added.
+  virtual void AddInputPort(const MidiPortInfo& info) = 0;
+  virtual void AddOutputPort(const MidiPortInfo& info) = 0;
+
+  // TODO(toyoshim): DisableInputPort(const MidiPortInfo& info) and
+  // DisableOutputPort(const MidiPortInfo& info) should be added.
+  // On DisableInputPort(), internal states, e.g. received_messages_queues in
+  // MidiHost, should be reset.
+
   // CompleteStartSession() is called when platform dependent preparation is
   // finished.
   virtual void CompleteStartSession(MidiResult result) = 0;
@@ -89,16 +100,6 @@ class MEDIA_EXPORT MidiManager {
                                     const std::vector<uint8>& data,
                                     double timestamp);
 
-  // input_ports() is a list of MIDI ports for receiving MIDI data.
-  // Each individual port in this list can be identified by its
-  // integer index into this list.
-  const MidiPortInfoList& input_ports() const { return input_ports_; }
-
-  // output_ports() is a list of MIDI ports for sending MIDI data.
-  // Each individual port in this list can be identified by its
-  // integer index into this list.
-  const MidiPortInfoList& output_ports() const { return output_ports_; }
-
  protected:
   friend class MidiManagerUsb;
 
@@ -145,6 +146,7 @@ class MEDIA_EXPORT MidiManager {
 
  private:
   void CompleteInitializationInternal(MidiResult result);
+  void AddInitialPorts(MidiManagerClient* client);
 
   // Keeps track of all clients who wish to receive MIDI data.
   typedef std::set<MidiManagerClient*> ClientSet;
@@ -164,13 +166,14 @@ class MEDIA_EXPORT MidiManager {
   // completed. Otherwise keeps MIDI_NOT_SUPPORTED.
   MidiResult result_;
 
-  // Protects access to |clients_|, |pending_clients_|, |initialized_|, and
-  // |result_|.
-  base::Lock lock_;
-
+  // Keeps all MidiPortInfo.
   MidiPortInfoList input_ports_;
   MidiPortInfoList output_ports_;
 
+  // Protects access to |clients_|, |pending_clients_|, |initialized_|,
+  // |result_|, |input_ports_| and |output_ports_|.
+  base::Lock lock_;
+
   DISALLOW_COPY_AND_ASSIGN(MidiManager);
 };