// src/backend/resource_policy_lifo.hh - Copyright 2005, 2006, University
//               of Padova, dept. of Pure and Applied
//               Mathematics
//
// This file is part of SGPEMv2.
//
// This 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 3 of the License, or
// (at your option) any later version.
//
// SGPEMv2 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 SGPEMv2. If not, see http://www.gnu.org/licenses/.


#ifndef RESOURCE_POLICY_LIFO_HH
#define RESOURCE_POLICY_LIFO_HH 1

#include "gettext.h"

#include <sgpemv2/policy_parameters.hh>
#include <sgpemv2/resource_policy.hh>
#include <sgpemv2/user_interrupt_exception.hh>

#include <glibmm/ustring.h>

namespace sgpem
{
  class ResourcePolicyLiFo;

  /** \brief
  It's a Strategy wich stay for a resource allocating algorithm.
  It implements the related resource allocation policy.
  */
  class SG_DLLLOCAL ResourcePolicyLiFo : public ResourcePolicy
  {
  public:
    virtual ~ResourcePolicyLiFo();

    /** \brief Initialize the inner components of the policy.
     *
     * Because it's a pure virtual method, must be re-implemented 
     * in concrete derived classes.
     */
    virtual void configure();

    /** \brief Mixes the queues. 
     *
     * Because it's a pure virtual method, must be re-implemented 
     * in concrete derived classes.
     */
    virtual void enforce(Environment& environment, Environment::SubRequestQueue& queue, SubRequest& sr);

    /** \brief Gets a string description of the policy.
     *
     * Because it's a pure virtual method, must be re-implemented 
     * in concrete derived classes.
     * \return String description of the policy.
     */
    virtual Glib::ustring get_description() const;

    /** \brief Returns the policy name 
     */
    virtual Glib::ustring get_name() const;

    /** \brief No-op method. 
     *
     *  \see ResourcePolicy::activate()
     */
    virtual void activate();

    /** \brief No-op method.
     *
     *  \see ResourcePolicy::deactivate()
     */
    virtual void deactivate();
  };

}//~ namespace sgpem


#endif
