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// -*- C++ -*-
//=============================================================================
/**
* @file CSD_TP_Request.h
*
* @author Tim Bradley <bradley_t@ociweb.com>
*/
//=============================================================================
#ifndef TAO_CSD_TP_REQUEST_H
#define TAO_CSD_TP_REQUEST_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/CSD_ThreadPool/CSD_TP_Servant_State.h"
#include "tao/PortableServer/Servant_Base.h"
#include "tao/Intrusive_Ref_Count_Base_T.h"
#include "tao/Intrusive_Ref_Count_Handle_T.h"
TAO_BEGIN_VERSIONED_NAMESPACE_DECL
namespace TAO
{
namespace CSD
{
class TP_Request;
typedef TAO_Intrusive_Ref_Count_Handle<TP_Request> TP_Request_Handle;
class TP_Queue;
/**
* @class TP_Request
*
* @brief Base class for "queue-able" requests.
*
* This class serves as the abstract base class for all types of
* "servant requests" that can be inserted into a TP_Queue
* object.
*/
class TAO_CSD_TP_Export TP_Request
: public TAO_Intrusive_Ref_Count_Base<TAO_SYNCH_MUTEX>
{
public:
/// Virtual Destructor.
virtual ~TP_Request();
/// Prepare the request to be placed into the request queue.
void prepare_for_queue();
/// Invoked to dispatch the request to the servant.
void dispatch();
/// Invoked to cancel the request.
void cancel();
/// Is the target servant ready to accept a request?
bool is_ready() const;
/// Mark the target servant as being busy.
void mark_as_busy();
/// Mark the target servant as being ready (ie, not busy).
void mark_as_ready();
/// This method returns true if this request targets the supplied
/// servant object.
bool is_target(PortableServer::Servant servant);
protected:
/// Constructor.
TP_Request(PortableServer::Servant servant,
TP_Servant_State* servant_state);
/// Accessor for the servant. Does not return a new (ref counted)
/// reference! This is used for chaining.
PortableServer::Servant servant();
/// The subclass knows if it needs to do anything in preparation
/// of being placed into the request queue. The default implementation
/// does nothing, so only subclasses that have something to do
/// need to provide their own implementation.
virtual void prepare_for_queue_i();
/// The subclass knows how to carry out its own way of dispatching
/// the request to the servant.
virtual void dispatch_i() = 0;
/// Ask the subclass to perform its duties to carry out the cancellation.
virtual void cancel_i() = 0;
private:
/// The TP_Queue class is our friend since it needs access to
/// the prev_ and next_ (private) data members.
friend class TP_Queue;
/// The previous TP_Request object (in the queue).
TP_Request* prev_;
/// The next TP_Request object (in the queue).
TP_Request* next_;
/// Reference to the servant object.
PortableServer::ServantBase_var servant_;
/// Reference to the servant "state" object (contains the busy flag).
TP_Servant_State::HandleType servant_state_;
};
}
}
TAO_END_VERSIONED_NAMESPACE_DECL
#if defined (__ACE_INLINE__)
# include "tao/CSD_ThreadPool/CSD_TP_Request.inl"
#endif /* __ACE_INLINE__ */
#include /**/ "ace/post.h"
#endif /* TAO_CSD_TP_REQUEST_H */
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