WriteHelper.ct

// $Id$
//
// Copyright (C) 2006 Stefan Bund <g0dil@berlios.de>
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the
// Free Software Foundation, Inc.,
// 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
// Copyright (C) 2006

/** \file
    \brief WriteHelper non-inline template implementation */

//#include "WriteHelper.ih"

// Custom includes
#include <errno.h>
#include "Utils/Exception.hh"
#include "Scheduler.hh"

#define prefix_
///////////////////////////////ct.p////////////////////////////////////////

template <class Handle>
prefix_ senf::WriteHelper<Handle>::WriteHelper(Handle handle, std::string data,
                                                      Callback callback)
    : handle_(handle), data_(data), callback_(callback),
      offset_(data_.begin()), errno_(0)
{
    senf::Scheduler::instance()
        .add(handle_, boost::bind(&WriteHelper::dispatchProcess, ptr(this), _1, _2),
             senf::Scheduler::EV_WRITE);
}

template <class Handle>
prefix_ std::string const & senf::WriteHelper<Handle>::data()
    const
{
    if (offset_ > data_.begin()) {
        data_.erase(data_.begin(),offset_);
        offset_ = data_.begin();
    }
    return data_;
}

template <class Handle>
prefix_ void senf::WriteHelper<Handle>::revoke()
{
    ptr guard (this); // To ensure, 'this' is deleted only after this method terminates ...
    senf::Scheduler::instance()
        .remove(handle_, senf::Scheduler::EV_WRITE);
}

template <class Handle>
prefix_ void
senf::WriteHelper<Handle>::dispatchProcess(ptr helper, Handle handle,
                                                  senf::Scheduler::EventId event)
{
    // since we have a 'ptr' argument, the instance cannot be deleted
    // before this method returns
    return helper->process(handle,event);
}

template <class Handle>
prefix_ void senf::WriteHelper<Handle>::process(Handle handle,
                                                       senf::Scheduler::EventId event)
{
    bool complete_ (false);
    try {
        if (event != senf::Scheduler::EV_WRITE)
            throw senf::SystemException(EPIPE);
        offset_ = handle.write(std::make_pair(offset_,data_.end()));
        if (offset_ == data_.end()) {
            data_.erase();
            offset_ = data_.begin();
            complete_ = true;
        }
    }
    catch (senf::SystemException const & ex) {
        errno_ = ex.err;
        done();
        return;
    }
    if (complete_)
        done();
}

template <class Handle>
prefix_ void senf::WriteHelper<Handle>::done()
{
    revoke();
    callback_(ptr(this));
}

///////////////////////////////ct.e////////////////////////////////////////
#undef prefix_


// 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: