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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_H_
#define MEDIA_BASE_CDM_PROMISE_H_
#include <string>
#include "base/basictypes.h"
#include "base/callback.h"
#include "media/base/media_export.h"
#include "media/base/media_keys.h"
namespace media {
// Interface for promises being resolved/rejected in response to various
// session actions. These may be called synchronously or asynchronously.
// The promise must be resolved or rejected exactly once. It is expected that
// the caller free the promise once it is resolved/rejected.
//
// This is only the base class, as parameter to resolve() varies.
class MEDIA_EXPORT CdmPromise {
public:
typedef base::Callback<void(MediaKeys::Exception exception_code,
uint32 system_code,
const std::string& error_message)>
PromiseRejectedCB;
virtual ~CdmPromise();
// Used to indicate that the operation failed. |exception_code| must be
// specified. |system_code| is a Key System-specific value for the error
// that occurred, or 0 if there is no associated status code or such status
// codes are not supported by the Key System. |error_message| is optional.
virtual void reject(MediaKeys::Exception exception_code,
uint32 system_code,
const std::string& error_message);
protected:
CdmPromise();
CdmPromise(PromiseRejectedCB reject_cb);
PromiseRejectedCB reject_cb_;
// Keep track of whether the promise hasn't been resolved or rejected yet.
bool is_pending_;
DISALLOW_COPY_AND_ASSIGN(CdmPromise);
};
template <typename T>
class MEDIA_EXPORT CdmPromiseTemplate : public CdmPromise {
public:
CdmPromiseTemplate(base::Callback<void(const T&)> resolve_cb,
PromiseRejectedCB rejected_cb);
virtual ~CdmPromiseTemplate();
virtual void resolve(const T& result);
private:
base::Callback<void(const T&)> resolve_cb_;
DISALLOW_COPY_AND_ASSIGN(CdmPromiseTemplate);
};
// Specialization for no parameter to resolve().
template <>
class MEDIA_EXPORT CdmPromiseTemplate<void> : public CdmPromise {
public:
CdmPromiseTemplate(base::Callback<void(void)> resolve_cb,
PromiseRejectedCB rejected_cb);
virtual ~CdmPromiseTemplate();
virtual void resolve();
protected:
// Allow subclasses to completely override the implementation.
CdmPromiseTemplate();
private:
base::Callback<void(void)> resolve_cb_;
DISALLOW_COPY_AND_ASSIGN(CdmPromiseTemplate);
};
} // namespace media
#endif // MEDIA_BASE_CDM_PROMISE_H_
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