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// -*- C++ -*-
//=============================================================================
/**
* @file Priority_Reactor.h
*
* @author Carlos O'Ryan <coryan@uci.edu>
*/
//=============================================================================
#ifndef ACE_PRIORITY_REACTOR_H
#define ACE_PRIORITY_REACTOR_H
#include /**/ "ace/pre.h"
#include /**/ "ace/ACE_export.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
#include "ace/Select_Reactor.h"
#include "ace/Unbounded_Queue.h"
ACE_BEGIN_VERSIONED_NAMESPACE_DECL
/**
* @class ACE_Priority_Reactor
*
* @brief Implements priority based dispatching.
*
* This class refines the dispatching mechanism for the
* Select_Reactor by taking advantage of the priority method on
* ACE_Event_Handler.
*/
class ACE_Export ACE_Priority_Reactor : public ACE_Select_Reactor
{
public:
/// Initialize ACE_Priority_Reactor with the default size.
ACE_Priority_Reactor (ACE_Sig_Handler * = 0,
ACE_Timer_Queue * = 0);
/// Initialize ACE_Priority_Reactor with size @a size.
ACE_Priority_Reactor (size_t size,
bool restart = false,
ACE_Sig_Handler * = 0,
ACE_Timer_Queue * = 0);
/// Close down the select_reactor and release all of its resources.
virtual ~ACE_Priority_Reactor (void);
/// Dump the state of an object.
void dump () const;
/// Declare the dynamic allocation hooks.
ACE_ALLOC_HOOK_DECLARE;
protected:
// = Dispatching methods.
/// We simply override this function to implement the priority
/// dispatching.
virtual int dispatch_io_set (int number_of_active_handles,
int &number_dispatched,
int mask,
ACE_Handle_Set &dispatch_mask,
ACE_Handle_Set &ready_mask,
ACE_EH_PTMF callback);
private:
/// A small helper to initialize the bucket.
void init_bucket (void);
/// Build the bucket from the given dispatch_mask. Return -1 on
/// failure, 0 otherwise.
int build_bucket (ACE_Handle_Set& dispatch_mask,
int &min_priority,
int &max_priority);
/// There is a queue per-priority, which simply holds the
/// Event_Handlers until we know who goes first.
typedef ACE_Unbounded_Queue<ACE_Event_Tuple> QUEUE;
QUEUE** bucket_;
/// The queues themselves use this allocator to minimize dynamic
/// memory usage.
ACE_Allocator* tuple_allocator_;
/// Deny access since member-wise won't work...
ACE_Priority_Reactor (const ACE_Priority_Reactor &);
ACE_Priority_Reactor &operator = (const ACE_Priority_Reactor &);
};
ACE_END_VERSIONED_NAMESPACE_DECL
#include /**/ "ace/post.h"
#endif /* ACE_PRIORITY_REACTOR_H */
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