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/* -*- C++ -*- */
// $Id$
// ============================================================================
//
// = LIBRARY
// ace
//
// = FILENAME
// Activation_Queue.h
//
// = AUTHOR
// Andres Kruse <Andres.Kruse@cern.ch> and Douglas C. Schmidt
// <schmidt@cs.wustl.edu>
//
// ============================================================================
#ifndef ACE_ACTIVATION_QUEUE_H
#define ACE_ACTIVATION_QUEUE_H
#include "ace/Synch_T.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
#include "ace/Message_Queue.h"
#include "ace/Method_Request.h"
// Be compatible with the terminology in the POSA2 book!
#define ACE_Activation_List ACE_Activation_Queue
class ACE_Export ACE_Activation_Queue
{
// = TITLE
// Reifies a method into a request. Subclasses typically
// represent necessary state and behavior.
//
// = DESCRIPTION
// A <Method_Request> is inserted in the <Activation_Queue>,
// where it is subsequently removed by the <Scheduler>, which
// invokes its <call> method..
public:
// = Initialization and termination methods.
ACE_Activation_Queue (ACE_Message_Queue<ACE_SYNCH> *new_queue = 0);
// Constructor.
virtual ~ACE_Activation_Queue (void);
// Destructor.
// = Activate Queue operations.
// For the following two methods if <timeout> == 0, the caller will
// block until action is possible, else will wait until the absolute
// time specified in *<timeout> elapses. These calls will return,
// however, when queue is closed, deactivated, when a signal occurs,
// or if the time specified in timeout elapses, (in which case errno
// = EWOULDBLOCK).
ACE_Method_Request *dequeue (ACE_Time_Value *tv = 0);
// Dequeue the next available <Method_Request>.
int enqueue (ACE_Method_Request *new_method_request,
ACE_Time_Value *tv = 0);
// Enqueue the <Method_Request> in priority order. The priority is
// determined by the <priority> method of the <new_message_request>.
int method_count (void) const;
// Get the current number of method objects in the queue.
int is_empty (void) const;
// Returns 1 if the queue is empty, 0 otherwise.
int is_full (void) const;
// Returns 1 if the queue is full, 0 otherwise.
void dump (void) const;
// Dump the state of an request.
ACE_ALLOC_HOOK_DECLARE;
// Declare the dynamic allocation hooks.
protected:
ACE_Message_Queue<ACE_SYNCH> *queue_;
// Stores the <Method_Requests>.
int delete_queue_;
// Keeps track of whether we need to delete the queue.
};
#if defined (__ACE_INLINE__)
#include "ace/Activation_Queue.i"
#endif /* __ACE_INLINE__ */
#endif /* ACE_ACTIVATION_QUEUE_H */
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