Add the copresence DirectiveHandler.

components/copresence/handlers/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_DIRECTIVE_HANDLER_
+#define COMPONENTS_COPRESENCE_HANDLERS_DIRECTIVE_HANDLER_
+
+#include <queue>

[xiyuan, 2014/07/25 21:02:09]

nit: not used?

[rkc, 2014/07/28 21:02:02]

Done.

+#include <string>
+
+#include "base/callback.h"
+#include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
+#include "components/copresence/handlers/audio/audio_directive_list.h"
+#include "components/copresence/mediums/audio/audio_recorder.h"
+
+namespace copresence {
+class Directive;
+}
+
+namespace copresence {
+
+class AudioDirectiveHandler;
+
+// The directive handler manages transmit and receive directives given to it
+// by the client.
+class DirectiveHandler {
+ public:
+  DirectiveHandler(const AudioRecorder::DecodeSamplesCallback& decode_cb,
+                   const AudioDirectiveList::EncodeTokenCallback& encode_cb);
+  virtual ~DirectiveHandler();

[xiyuan, 2014/07/25 21:02:09]

nit: No need to be "virtual" if the class is not intended to be inherited.

[rkc, 2014/07/28 21:02:02]

Done.

+
+  // Adds a directive to handle.
+  void AddDirective(const copresence::Directive& directive);
+  // Removes any directives associated with the given operation id.
+  void RemoveDirectives(const std::string& op_id);
+
+ private:
+  // Audio:

[Daniel Erat, 2014/07/28 21:18:17]

nit: delete unnecessary comment

[rkc, 2014/07/29 00:33:35]

Done.

+  scoped_ptr<AudioDirectiveHandler> audio_handler_;
+
+  DISALLOW_COPY_AND_ASSIGN(DirectiveHandler);
+};
+
+}  // namespace copresence
+
+#endif  // COMPONENTS_COPRESENCE_HANDLERS_DIRECTIVE_HANDLER_