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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include "error.h"
#include "message.h"
#include <memory>
namespace mbus {
/**
* A Result object is used as return value when trying to send a
* Message on a SourceSession. It says whether messagebus has accepted
* the message or not. If messagebus accepts the message an
* asynchronous reply will be delivered at a later time. If messagebus
* does not accept the message, the returned Result will indicate why
* the message was not accepted. A Result indication an error will
* also contain the message that did not get accepted, passing it back
* to the application. Note that Result objects have destructive copy
* of the pointer to the Message that is handed back to the
* application.
**/
class Result
{
private:
bool _accepted;
Error _error;
std::unique_ptr<Message> _msg;
public:
/**
* Create a Result indicating that messagebus has accepted the
* Message.
**/
Result();
/**
* Create a Result indicating that messagebus has not accepted the
* Message.
*
* @param err the reason for not accepting the Message
* @param msg the message that did not get accepted
**/
Result(const Error &err, std::unique_ptr<Message> msg);
Result(Result &&rhs) = default;
Result &operator=(Result &&rhs) = default;
~Result();
/**
* Check if the message was accepted.
*
* @return true if the Message was accepted
**/
bool isAccepted() const { return _accepted; }
/**
* Obtain the error causing the message not to be accepted.
*
* @return error
**/
const Error &getError() const { return _error; }
/**
* If the message was not accepted, this method may be used to get
* the Message back out. Note that this method hands the Message
* over to the caller. Also note that copying the Result will
* transfer the ownership of the Message to the new copy.
*
* @return the Message that was not accepted
**/
std::unique_ptr<Message> getMessage() { return std::move(_msg); }
};
} // namespace mbus
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