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
  11 namespace media {
  12
  13 class MidiManager;
  14 class MidiManagerClient;
  15
  16 // TODO(crbug.com/467442): Make tasks cancelable per client.
  17 class MidiScheduler final {
  18  public:
  19   MidiScheduler(MidiManager* manager);
  20   ~MidiScheduler();
  21
  22   // Post |closure| to the current message loop safely. The |closure| will not
  23   // be invoked after MidiScheduler is deleted. AccumulateMidiBytesSent() of
  24   // |client| is called internally.
  25   void PostSendDataTask(MidiManagerClient* client,
  26                         size_t length,
  27                         double timestamp,
  28                         const base::Closure& closure);
  29
  30  private:
  31   void InvokeClosure(MidiManagerClient* client,
  32                      size_t length,
  33                      const base::Closure& closure);
  34
  35   // MidiManager should own the MidiScheduler and be alive longer.
  36   MidiManager* manager_;
  37   base::WeakPtrFactory<MidiScheduler> weak_factory_;
  38
  39   DISALLOW_COPY_AND_ASSIGN(MidiScheduler);
  40 };
  41
  42 }  // namespace media
  43
  44 #endif  // MEDIA_MIDI_MIDI_SCHEDULER_H_