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/*
* Copyright (c) 2020 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#ifndef RTC_BASE_THREAD_MESSAGE_H_
#define RTC_BASE_THREAD_MESSAGE_H_
#include <list>
#include <memory>
#include <utility>
#include "api/scoped_refptr.h"
#include "rtc_base/location.h"
#include "rtc_base/message_handler.h"
namespace rtc {
// Derive from this for specialized data
// App manages lifetime, except when messages are purged
class MessageData {
public:
MessageData() {}
virtual ~MessageData() {}
};
template <class T>
class TypedMessageData : public MessageData {
public:
explicit TypedMessageData(const T& data) : data_(data) {}
const T& data() const { return data_; }
T& data() { return data_; }
private:
T data_;
};
// Like TypedMessageData, but for pointers that require a delete.
template <class T>
class ScopedMessageData : public MessageData {
public:
explicit ScopedMessageData(std::unique_ptr<T> data)
: data_(std::move(data)) {}
const T& data() const { return *data_; }
T& data() { return *data_; }
T* Release() { return data_.release(); }
private:
std::unique_ptr<T> data_;
};
// Like ScopedMessageData, but for reference counted pointers.
template <class T>
class ScopedRefMessageData : public MessageData {
public:
explicit ScopedRefMessageData(T* data) : data_(data) {}
const scoped_refptr<T>& data() const { return data_; }
scoped_refptr<T>& data() { return data_; }
private:
scoped_refptr<T> data_;
};
template <class T>
inline MessageData* WrapMessageData(const T& data) {
return new TypedMessageData<T>(data);
}
template <class T>
inline const T& UseMessageData(MessageData* data) {
return static_cast<TypedMessageData<T>*>(data)->data();
}
template <class T>
class DisposeData : public MessageData {
public:
explicit DisposeData(T* data) : data_(data) {}
virtual ~DisposeData() { delete data_; }
private:
T* data_;
};
const uint32_t MQID_ANY = static_cast<uint32_t>(-1);
const uint32_t MQID_DISPOSE = static_cast<uint32_t>(-2);
// No destructor
struct Message {
Message() : phandler(nullptr), message_id(0), pdata(nullptr) {}
inline bool Match(MessageHandler* handler, uint32_t id) const {
return (handler == nullptr || handler == phandler) &&
(id == MQID_ANY || id == message_id);
}
Location posted_from;
MessageHandler* phandler;
uint32_t message_id;
MessageData* pdata;
};
typedef std::list<Message> MessageList;
} // namespace rtc
#endif // RTC_BASE_THREAD_MESSAGE_H_
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