ReadHelper.hh

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//
// Copyright (c) 2020 Fraunhofer Institute for Applied Information Technology (FIT)
//                    Network Research Group (NET)
//                    Schloss Birlinghoven, 53754 Sankt Augustin, GERMANY
//                    Contact: support@wiback.org
//
// This file is part of the SENF code tree.
// It is licensed under the 3-clause BSD License (aka New BSD License).
// See LICENSE.txt in the top level directory for details or visit
// https://opensource.org/licenses/BSD-3-Clause
//


#ifndef HH_SENF_Scheduler_ReadHelper_
#define HH_SENF_Scheduler_ReadHelper_ 1

// Custom includes
#include <string>
#include <boost/function.hpp>
#include <boost/intrusive_ptr.hpp>
#include <boost/scoped_ptr.hpp>

#include <senf/Utils/intrusive_refcount.hh>
#include "FdEvent.hh"

//#include "ReadHelper.mpp"
//-/////////////////////////////////////////////////////////////////////////////////////////////////

namespace senf {


    template <class Handle>
    class ReadHelper
        : public senf::intrusive_refcount
    {
    public:
        //-////////////////////////////////////////////////////////////////////////
        // Types

        typedef boost::intrusive_ptr<ReadHelper> ptr; 
        typedef boost::function<void (ptr)> Callback; 

        //-////////////////////////////////////////////////////////////////////////
        //\{

        static ptr dispatch(Handle handle, std::string::size_type maxSize,
                            Callback callback); 

        template <class Predicate>
        static ptr dispatch(Handle handle, std::string::size_type maxSize, Predicate const & predicate,
                            Callback callback); 

        //\}
        //-////////////////////////////////////////////////////////////////////////

        Handle handle() const;          
        std::string::size_type maxSize() const; 

        std::string const & data() const; 
        std::string const & tail() const; 

        bool complete() const;          
        bool error() const;             
        void throw_error() const;       

        void revoke();                  

    protected:

    private:
        struct InternalPredicate;

        ReadHelper(Handle handle, std::string::size_type maxSize,
                   InternalPredicate * predicate, Callback cb);

        static void dispatchProcess(ptr helper, Handle handle, int event);
        void process(Handle handle, int event);
        void done();

        Handle handle_;
        scheduler::FdEvent fde_;
        std::string::size_type maxSize_;
        boost::scoped_ptr<InternalPredicate> predicate_;
        Callback callback_;

        std::string data_;
        std::string tail_;
        int errno_;
        bool complete_;
    };

    struct ReadUntil
    {
        ReadUntil(std::string const & target);
        std::string::size_type operator()(std::string const & data);
        std::string target;
    };

}

//-/////////////////////////////////////////////////////////////////////////////////////////////////
#include "ReadHelper.cci"
#include "ReadHelper.ct"
#include "ReadHelper.cti"
//#include "ReadHelper.mpp"
#endif


// Local Variables:
// mode: c++
// fill-column: 100
// c-file-style: "senf"
// indent-tabs-mode: nil
// ispell-local-dictionary: "american"
// compile-command: "scons -u test"
// comment-column: 40
// End: