media/midi/midi_scheduler.h

   1 // Copyright 2015 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef MEDIA_MIDI_MIDI_SCHEDULER_H_
   6 #define MEDIA_MIDI_MIDI_SCHEDULER_H_
   7
   8 #include "base/callback.h"
   9 #include "base/memory/weak_ptr.h"
  10 #include "media/midi/midi_export.h"
  11
  12 namespace media {
  13 namespace midi {
  14
  15 class MidiManager;
  16 class MidiManagerClient;
  17
  18 // TODO(crbug.com/467442): Make tasks cancelable per client.
  19 class MIDI_EXPORT MidiScheduler final {
  20  public:
  21   explicit MidiScheduler(MidiManager* manager);
  22   ~MidiScheduler();
  23
  24   // Post |closure| to the current message loop safely. The |closure| will not
  25   // be invoked after MidiScheduler is deleted. AccumulateMidiBytesSent() of
  26   // |client| is called internally.
  27   void PostSendDataTask(MidiManagerClient* client,
  28                         size_t length,
  29                         double timestamp,
  30                         const base::Closure& closure);
  31
  32  private:
  33   void InvokeClosure(MidiManagerClient* client,
  34                      size_t length,
  35                      const base::Closure& closure);
  36
  37   // MidiManager should own the MidiScheduler and be alive longer.
  38   MidiManager* manager_;
  39   base::WeakPtrFactory<MidiScheduler> weak_factory_;
  40
  41   DISALLOW_COPY_AND_ASSIGN(MidiScheduler);
  42 };
  43
  44 }  // namespace midi
  45 }  // namespace media
  46
  47 #endif  // MEDIA_MIDI_MIDI_SCHEDULER_H_