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// 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_PROMISE_ADAPTER_H_
#define MEDIA_BASE_CDM_PROMISE_ADAPTER_H_
#include "base/basictypes.h"
#include "base/containers/scoped_ptr_hash_map.h"
#include "base/macros.h"
#include "base/memory/scoped_ptr.h"
#include "media/base/cdm_promise.h"
#include "media/base/media_export.h"
namespace media {
// Helps convert CdmPromises to an integer identifier and vice versa. The
// integer identifier is needed where we cannot pass CdmPromises through, such
// as PPAPI, IPC and JNI.
class MEDIA_EXPORT CdmPromiseAdapter {
public:
CdmPromiseAdapter();
~CdmPromiseAdapter();
// Takes ownership of |promise| and returns an integer promise ID.
uint32_t SavePromise(scoped_ptr<media::CdmPromise> promise);
// Takes the promise for |promise_id|, sanity checks its |type|, and resolves
// it with |result|.
template <typename... T>
void ResolvePromise(uint32_t promise_id, const T&... result);
// Takes the promise for |promise_id| and rejects it with |exception_code|,
// |system_code| and |error_message|.
void RejectPromise(uint32_t promise_id,
MediaKeys::Exception exception_code,
uint32 system_code,
const std::string& error_message);
// Rejects and clears all |promises_|.
void Clear();
private:
// A map between promise IDs and CdmPromises. It owns the CdmPromises.
typedef base::ScopedPtrHashMap<uint32_t, scoped_ptr<CdmPromise>> PromiseMap;
// Finds, takes the ownership of and returns the promise for |promise_id|.
// Returns null if no promise can be found.
scoped_ptr<CdmPromise> TakePromise(uint32_t promise_id);
uint32_t next_promise_id_;
PromiseMap promises_;
DISALLOW_COPY_AND_ASSIGN(CdmPromiseAdapter);
};
} // namespace media
#endif // MEDIA_BASE_CDM_PROMISE_ADAPTER_H_
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