k3resolverworkerbase.h

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/*  -*- C++ -*-
 *  Copyright (C) 2003-2005 Thiago Macieira <thiago@kde.org>
 *
 *
 *  Permission is hereby granted, free of charge, to any person obtaining
 *  a copy of this software and associated documentation files (the
 *  "Software"), to deal in the Software without restriction, including
 *  without limitation the rights to use, copy, modify, merge, publish,
 *  distribute, sublicense, and/or sell copies of the Software, and to
 *  permit persons to whom the Software is furnished to do so, subject to
 *  the following conditions:
 *
 *  The above copyright notice and this permission notice shall be included 
 *  in all copies or substantial portions of the Software.
 *
 *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

#ifndef KRESOLVERWORKERBASE_H
#define KRESOLVERWORKERBASE_H

#include "k3resolver.h"

// forward declarations
class QString;
template <class T> class QValueList;

namespace KNetwork {

  namespace Internal
  {
    class KResolverThread;
    struct InputData;
  }

class KResolverWorkerBase
{
public:

  class ResolverLocker
  {
  public:
    ResolverLocker(KResolverWorkerBase* parent)
      : parent( parent ) 
    {
      parent->acquireResolver();
    }

    ~ResolverLocker() 
    {
      parent->releaseResolver();
    }

    void openClose() 
    {
      parent->releaseResolver();
      parent->acquireResolver();
    }

  private:
    KResolverWorkerBase* parent;
  };
private:
  // this will be like our d pointer
  KNetwork::Internal::KResolverThread *th;
  const KNetwork::Internal::InputData *input;
  friend class KNetwork::Internal::KResolverThread;
  friend class KNetwork::Internal::KResolverManager;
  friend class KResolverWorkerBase::ResolverLocker;

  int m_finished : 1;
  int m_reserved : 31;      // reserved

public:
  KResolverResults results;

public:
  // default constructor
  KResolverWorkerBase();

  // virtual destructor
  virtual ~KResolverWorkerBase();

  QString nodeName() const;

  QString serviceName() const;

  int flags() const;

  int familyMask() const;

  int socketType() const;

  int protocol() const;

  QByteArray protocolName() const;

  void finished();

protected:
  // like a QThread
  virtual bool run() = 0;

  virtual bool preprocess() = 0;

  virtual bool postprocess();

  inline void setError(int errorcode, int syserror = 0)
  { results.setError(errorcode, syserror); }

  bool enqueue(KResolver* other);

  bool enqueue(KResolverWorkerBase* worker);

  bool checkResolver();

  void acquireResolver();

  void releaseResolver();

};

class KResolverWorkerFactoryBase
{
public:
  virtual ~KResolverWorkerFactoryBase() {}
  virtual KResolverWorkerBase* create() const = 0;
  static void registerNewWorker(KResolverWorkerFactoryBase* factory);
};

template<class Worker>
class KResolverWorkerFactory: public KResolverWorkerFactoryBase
{
public:
  virtual KResolverWorkerBase* create() const
  { return new Worker; }
};

}               // namespace KNetwork

#endif