kresolverworkerbase.h

/*
 *  Copyright (C) 2003,2004 Thiago Macieira <thiago.macieira@kdemail.net>
 *
 *
 *  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 "kresolver.h"
 
// forward declarations
class TQString;
template <class T> class TQValueList;
 
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();
 
  TQString nodeName() const;
 
  TQString serviceName() const;
 
  int flags() const;
 
  int familyMask() const;
 
  int socketType() const;
 
  int protocol() const;
 
  TQCString 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:
  // default constructor
  KResolverWorkerFactoryBase();
 
  // virtual destructor
  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