Refactor CdmPromise and related classes

media/base/cdm_callback_promise.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 MEDIA_BASE_CDM_CALLBACK_PROMISE_H_
+#define MEDIA_BASE_CDM_CALLBACK_PROMISE_H_
+
+#include <string>
+
+#include "base/basictypes.h"
+#include "base/callback.h"
+#include "media/base/cdm_promise.h"
+#include "media/base/media_export.h"
+#include "media/base/media_keys.h"
+
+namespace media {
+
+typedef base::Callback<void(MediaKeys::Exception exception_code,
+                            uint32 system_code,
+                            const std::string& error_message)>
+    PromiseRejectedCB;
+
+template <typename... T>
+class MEDIA_EXPORT CdmCallbackPromise : public CdmPromiseTemplate<T...> {
+ public:
+  CdmCallbackPromise(base::Callback<void(const T&...)> resolve_cb,
+                     PromiseRejectedCB reject_cb);

[xhwang, 2014/10/03 07:34:21]

pass callback by const-ref

[jrummell, 2014/10/03 18:58:30]

Done.

+  virtual ~CdmCallbackPromise();
+
+  // CdmPromiseTemplate<T> implementation.
+  virtual void resolve(const T&... result) OVERRIDE;
+  virtual void reject(MediaKeys::Exception exception_code,
+                      uint32 system_code,
+                      const std::string& error_message) OVERRIDE;
+
+ private:
+  base::Callback<void(const T&...)> resolve_cb_;
+  PromiseRejectedCB reject_cb_;
+
+  DISALLOW_COPY_AND_ASSIGN(CdmCallbackPromise);
+};
+
+}  // namespace media
+
+#endif  // MEDIA_BASE_CDM_CALLBACK_PROMISE_H_