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// -*- C++ -*-
//=============================================================================
/**
* @file CSD_TP_Queue.h
*
* @author Tim Bradley <bradley_t@ociweb.com>
*/
//=============================================================================
#ifndef TAO_CSD_TP_QUEUE_H
#define TAO_CSD_TP_QUEUE_H
#include /**/ "ace/pre.h"
#include "tao/CSD_ThreadPool/CSD_TP_Export.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
#include "tao/Versioned_Namespace.h"
#include "tao/orbconf.h"
TAO_BEGIN_VERSIONED_NAMESPACE_DECL
namespace TAO
{
namespace CSD
{
class TP_Request;
class TP_Queue_Visitor;
/**
* @class TP_Queue
*
* @brief Queue of servant requests that need to be dispatched.
*
* This is the queue of pending servant requests that is "owned"
* by a TP_Strategy object. When an ORB thread dispatches
* a servant request to the strategy object, it will create the
* appropriate (subclass of) TP_Request object to "wrap"
* the servant request in a "queue-friendly" wrapper. The ORB thread
* will then place the TP_Request object on to the queue. Note that
* this scenario pertains to what are being called "remote requests".
* There are other scenarios in which other types of requests can
* get added to this queue.
*
* The strategy object will employ a set of worker threads that are
* responsible for "servicing" the servant requests in the queue.
*
* Note: In the future, support will be added to allow the client
* application inject "custom" TP_Request objects into
* a TP_Strategy object, causing them to be placed in
* the queue.
*/
class TAO_CSD_TP_Export TP_Queue
{
public:
/// Default Constructor.
TP_Queue();
/// Destructor.
~TP_Queue();
/// Place a request at the end of the queue.
void put(TP_Request* request);
/// Returns true if the queue is empty. Returns false otherwise.
bool is_empty() const;
/// Visitors will visit each request in the queue, from front to back,
/// and have the ability to stop visiting at any time (ie, before
/// visiting every request).
void accept_visitor(TP_Queue_Visitor& visitor);
private:
/// The request at the front of the queue.
TP_Request* head_;
/// The request at the end of the queue.
TP_Request* tail_;
};
}
}
TAO_END_VERSIONED_NAMESPACE_DECL
#if defined (__ACE_INLINE__)
# include "tao/CSD_ThreadPool/CSD_TP_Queue.inl"
#endif /* __ACE_INLINE__ */
#include /**/ "ace/post.h"
#endif /* TAO_CSD_TP_QUEUE_H */
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