Refactoring AudioDirectiveHandler to support testing

components/copresence/handlers/audio/audio_directive_handler.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_COPRESENCE_HANDLERS_AUDIO_AUDIO_DIRECTIVE_HANDLER_H_
 #define COMPONENTS_COPRESENCE_HANDLERS_AUDIO_AUDIO_DIRECTIVE_HANDLER_H_
 
 #include <string>
 
-#include "base/basictypes.h"
-#include "base/macros.h"
-#include "base/memory/ref_counted.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/time/time.h"
-#include "components/copresence/handlers/audio/audio_directive_list.h"
 #include "components/copresence/mediums/audio/audio_manager.h"
-#include "components/copresence/proto/data.pb.h"
+#include "components/copresence/public/copresence_constants.h"
 
 namespace base {
-class Timer;
-}
-
-namespace media {
-class AudioBusRefCounted;
+class TimeDelta;
 }
 
 namespace copresence {
 
-class TickClockRefCounted;
+class TokenInstruction;
 
 // The AudioDirectiveHandler handles audio transmit and receive instructions.
-// TODO(rkc): Currently since WhispernetClient can only have one token encoded
-// callback at a time, we need to have both the audible and inaudible in this
-// class. Investigate a better way to do this; a few options are abstracting
-// out token encoding to a separate class, or allowing whispernet to have
-// multiple callbacks for encoded tokens being sent back and have two versions
-// of this class.
-class AudioDirectiveHandler final {
+class AudioDirectiveHandler {
  public:
-  AudioDirectiveHandler();
-  ~AudioDirectiveHandler();
+  virtual ~AudioDirectiveHandler() {}
 
   // Do not use this class before calling this.
-  void Initialize(const AudioManager::DecodeSamplesCallback& decode_cb,
-                  const AudioManager::EncodeTokenCallback& encode_cb);
+  virtual void Initialize(
+      const AudioManager::DecodeSamplesCallback& decode_cb,
+      const AudioManager::EncodeTokenCallback& encode_cb) = 0;
 
   // Adds an instruction to our handler. The instruction will execute and be
   // removed after the ttl expires.
-  void AddInstruction(const copresence::TokenInstruction& instruction,
-                      const std::string& op_id,
-                      base::TimeDelta ttl_ms);
+  virtual void AddInstruction(const TokenInstruction& instruction,
+                              const std::string& op_id,
+                              base::TimeDelta ttl_ms) = 0;
 
   // Removes all instructions associated with this operation id.
-  void RemoveInstructions(const std::string& op_id);
+  virtual void RemoveInstructions(const std::string& op_id) = 0;
 
   // Returns the currently playing token.
-  const std::string PlayingToken(AudioType type) const;
-
-  // The manager being passed in needs to be uninitialized.
-  void set_audio_manager_for_testing(scoped_ptr<AudioManager> manager) {
-    audio_manager_ = manager.Pass();
-  }
-
-  void set_clock_for_testing(const scoped_refptr<TickClockRefCounted>& clock);
-  void set_timer_for_testing(scoped_ptr<base::Timer> timer);
-
- private:
-  // Processes the next active instruction, updating our audio manager state
-  // accordingly.
-  void ProcessNextInstruction();
-
-  // Returns the time that an instruction expires at. This will always return
-  // the earliest expiry time among all the active receive and transmit
-  // instructions. In case we don't have any active instructions, this method
-  // returns false.
-  bool GetNextInstructionExpiry(base::TimeTicks* next_event);
-
-  scoped_ptr<AudioManager> audio_manager_;
-
-  // Audible and inaudible lists.
-  // AUDIBLE = 0, INAUDIBLE = 1 (see copresence_constants.h).
-  AudioDirectiveList transmits_list_[2];
-  AudioDirectiveList receives_list_[2];
-
-  scoped_ptr<base::Timer> audio_event_timer_;
-
-  scoped_refptr<TickClockRefCounted> clock_;
-
-  DISALLOW_COPY_AND_ASSIGN(AudioDirectiveHandler);
+  virtual const std::string PlayingToken(AudioType type) const = 0;
 };
 
 }  // namespace copresence
 
 #endif  // COMPONENTS_COPRESENCE_HANDLERS_AUDIO_AUDIO_DIRECTIVE_HANDLER_H_