aria2/src/SequentialDispatcherCommand.h

/* <!-- copyright */
/*
 * aria2 - The high speed download utility
 *
 * Copyright (C) 2009 Tatsuhiro Tsujikawa
 *
 * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 *
 * In addition, as a special exception, the copyright holders give
 * permission to link the code of portions of this program with the
 * OpenSSL library under certain conditions as described in each
 * individual source file, and distribute linked combinations
 * including the two.
 * You must obey the GNU General Public License in all respects
 * for all of the code used other than OpenSSL.  If you modify
 * file(s) with this exception, you may extend this exception to your
 * version of the file(s), but you are not obligated to do so.  If you
 * do not wish to do so, delete this exception statement from your
 * version.  If you delete this exception statement from all source
 * files in the program, then also delete it here.
 */
/* copyright --> */
#ifndef _D_SEQUENTIAL_DISPATCHER_COMMAND_H_
#define _D_SEQUENTIAL_DISPATCHER_COMMAND_H_

#include "Command.h"
#include "SharedHandle.h"
#include "SequentialPicker.h"
#include "DownloadEngine.h"
#include "RequestGroupMan.h"

namespace aria2 {

class DownloadEngine;

template<typename T>
class SequentialDispatcherCommand : public Command {
private:
  SharedHandle<SequentialPicker<T> > picker_;

  DownloadEngine* e_;
protected:
  DownloadEngine* getDownloadEngine() const
  {
    return e_;
  }
public:
  SequentialDispatcherCommand(cuid_t cuid,
                              const SharedHandle<SequentialPicker<T> >& picker,
                              DownloadEngine* e):
    Command(cuid), picker_(picker), e_(e)
  {
    setStatusRealtime();
  }
  
  virtual bool execute()
  {
    if(e_->getRequestGroupMan()->downloadFinished() || e_->isHaltRequested()) {
      return true;
    }
    if(picker_->hasNext() && !picker_->isPicked()) {
      e_->addCommand(createCommand(picker_->pickNext()));

      e_->setNoWait(true);
    }

    e_->addRoutineCommand(this);
    return false;
  }

protected:
  virtual Command* createCommand(const SharedHandle<T>& entry) = 0;
};

} // namespace aria2

#endif // _D_SEQUENTIAL_DISPATCHER_COMMAND_H_