BatchCommand.hh

//********************************************************************
//*** ResourcePool/BatchCommand.hh
//*** Copyright (c) 2003-2009 by Markus Winand <mws@fatalmind.com>
//*** $Id: BatchCommand.hh,v 1.21 2009-06-23 18:51:39 mws Exp $
//********************************************************************
/*
This file is part of ResourcePool.

ResourcePool 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.

ResourcePool 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 ResourcePool; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307  USA */

#ifndef RESOURCEPOOL_BATCHCOMMAND_HH
#define RESOURCEPOOL_BATCHCOMMAND_HH

#include <vector>

#include "mm/gc_ptr.hh"
#include "util/Clone.hh"

namespace fatalmind {

/*
 * developers note:
 * i would actually love to have a error handling interface with something like BatchException.
 * However, thats hard/impossible to implement in C++, since it is impossible to maintain
 * exception neutral behavior and storing the exception's somewhere.
 */

template<class CommandType>
class BatchCommand: public CommandType
{
    protected:
        typedef gc_ptr<CommandType> member_t;
        typedef std::vector<member_t> list_t;
    public:
        typedef CommandType innercommand_t;
        typedef typename list_t::const_iterator const_iterator;
        static const int NOT_STARTED;
        static const int NO_FURTHER_ERROR;

        BatchCommand(bool cont = false);

        BatchCommand(const BatchCommand&);
        virtual ~BatchCommand() {
        }

        virtual void add(const CommandType&);
        virtual void execute(typename CommandType::pool_type::resource_t&);

        int getError();
        const_iterator getExecPosition() const;

        bool doesContinue() const {
            return cont;
        }

        const_iterator end() const;
        const_iterator begin() const;
        bool empty() const;

        virtual void outputoperator(std::ostream&) const;
    protected:
        virtual Clone* DoClone() const {
            return new BatchCommand(*this);
        }

        member_t getLast() const {
            return list.back();
        }

        bool wasStarted() const {
            return started;
        }


    private:
        list_t list;
        const bool cont;
        bool started;
    protected:
        const_iterator exec_pos;
        typedef std::vector<int> errors_t;
        errors_t errors;
        unsigned int error_pos;
}; // class Batch

} // namespace fatalmind
#endif

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