message.h

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/*****************************************************************************
* Multiscale Universal Interface Code Coupling Library                       *
*                                                                            *
* Copyright (C) 2019 Y. H. Tang, S. Kudo, X. Bian, Z. Li, G. E. Karniadakis  *
*                                                                            *
* This software is jointly licensed under the Apache License, Version 2.0    *
* and the GNU General Public License version 3, you may use it according     *
* to either.                                                                 *
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* ** Apache License, version 2.0 **                                          *
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* Licensed under the Apache License, Version 2.0 (the "License");            *
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* http://www.apache.org/licenses/LICENSE-2.0                                 *
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* ** GNU General Public License, version 3 **                                *
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*****************************************************************************/
 
#ifndef MESSAGE_H_
#define MESSAGE_H_
 
#include <memory>
#include "../../general/util.h"
#include "../../storage/stream.h"
#include "../../storage/stream_string.h"
#include "../../storage/stream_vector.h"
#include "../../storage/stream_tuple.h"
 
namespace mui {
 
struct message
{
public:
    using id_type = std::string;
private:
        id_type     id_;
        std::size_t id_size_;
        std::vector<char> data_;
public:
    message() : id_(), id_size_(0u), data_() {}
 
    template<typename... types>
    static message make( const id_type& id, types&&... data ) {
        message msg;
        msg.id_ = id;
        msg.id_size_ = streamed_size(id);
        std::size_t n = msg.id_size_ + streamed_size(data...);
        msg.data_.resize(n);
        auto stream = make_ostream(msg.data_.data());
        stream << id << std::forward_as_tuple(data...);
        return msg;
    }
    static message make( std::vector<char> data ){
        message m;
        m.data_.swap(data);
        auto in = make_istream(m.data_.begin());
        in >> m.id_;
        m.id_size_ = streamed_size(m.id_);
        return m;
    }
 
    bool has_id() const { return !id_.empty(); }
 
    const id_type& id() const { return id_; }
    const char* data() const { return data_.data() + id_size_; }
    std::size_t size() const { return data_.size() - id_size_; }
    std::vector<char> detach() {
        std::vector<char> data;
        data.swap(data_);
        id_.clear();
        id_size_ = 0;
        return data;
    }
private:
    friend ostream& operator<<( ostream&, const message&);
};
 
// serialization & deserialization method
inline ostream& operator<< ( ostream& stream, const message& m )
{
    stream << m.data_;
    return stream;
}
 
inline istream& operator>> ( istream& stream, message& m )
{
    std::vector<char> v;
    stream >> v;
    m = message::make(v);
    return stream;
}
 
}
 
#endif /* MESSAGE_H_ */