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/* -*- C++ -*- */
// $Id$

// ============================================================================
//
// = LIBRARY
//    ace
//
// = FILENAME
//   Strategies.h
//
// = AUTHOR
//    Doug Schmidt
//
// ============================================================================

#if !defined (ACE_STRATEGIES_H)
#define ACE_STRATEGIES_H

#include "ace/Event_Handler.h"

// Forward decls.
class ACE_Reactor;

class ACE_Export ACE_Notification_Strategy
{
  // = TITLE
  //     Abstract class used for notifing an interested party
  //
  // = DESCRIPTION
  //     A vehicle for extending the behavior of ACE_Message_Queue wrt
  //     notification *without subclassing*.  Thus, it's an example of
  //     the Bridge/Strategy patterns.
public:
  ACE_Notification_Strategy (ACE_Event_Handler *eh,
			     ACE_Reactor_Mask mask);
  virtual ~ACE_Notification_Strategy (void);

  virtual int notify (void) = 0;
  virtual int notify (ACE_Event_Handler *,
		      ACE_Reactor_Mask mask) = 0;

  // Get/Set the event handler
  ACE_Event_Handler *event_handler (void);
  void event_handler (ACE_Event_Handler *eh);

  // Get/Set the reactor mask
  ACE_Reactor_Mask mask (void);
  void mask (ACE_Reactor_Mask m);

protected:
  ACE_Event_Handler *eh_;
  ACE_Reactor_Mask mask_;
};

class ACE_Export ACE_Reactor_Notification_Strategy : public ACE_Notification_Strategy
{
  // = TITLE
  //     Used to notify an ACE_Reactor
  //
  // = DESCRIPTION
  //     Integrates the ACE_Message_Queue notification into the
  //     ACE_Reactor::notify() method.
public:
  ACE_Reactor_Notification_Strategy (ACE_Reactor *reactor,
				     ACE_Event_Handler *eh,
				     ACE_Reactor_Mask mask);

  ~ACE_Reactor_Notification_Strategy (void);
  // Default dtor.

  virtual int notify (void);

  virtual int notify (ACE_Event_Handler *,
		      ACE_Reactor_Mask mask);

  // Get/Set the reactor
  ACE_Reactor *reactor (void);
  void reactor (ACE_Reactor *r);

protected:
  ACE_Reactor *reactor_;
};

class ACE_Export ACE_Connection_Recycling_Strategy
{
  // = TITLE
  //     Defines the interface for a connection recycler.
public:
  virtual ~ACE_Connection_Recycling_Strategy (void);
  // Virtual Destructor

  virtual int purge (const void *recycling_act) = 0;
  // Remove from cache.

  virtual int cache (const void *recycling_act) = 0;
  // Add to cache.

protected:
  ACE_Connection_Recycling_Strategy (void);
  // Default ctor.
};

// This needs to come here to avoid circular dependencies.
#include "ace/Strategies_T.h"

#if defined (__ACE_INLINE__)
#include "ace/Strategies.i"
#endif /* __ACE_INLINE __ */

#endif /* ACE_STRATEGIES_H */