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// -*- C++ -*-
//
//=============================================================================
/**
* @file Synch_Invocation.h
*
* $Id$
*
*
* @author Balachandran Natarajan <bala@dre.vanderbilt.edu>
*/
//=============================================================================
#ifndef TAO_SYNCH_INVOCATION_H
#define TAO_SYNCH_INVOCATION_H
#include /**/ "ace/pre.h"
#include "tao/Remote_Invocation.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
#include "tao/Exception.h"
class TAO_Operation_Details;
class TAO_Synch_Reply_Dispatcher;
class TAO_InputCDR;
class ACE_Time_Value;
class TAO_Bind_Dispatcher_Guard;
namespace CORBA
{
class SystemException;
}
namespace TAO
{
class Profile_Transport_Resolver;
/**
* @class Synch_Twoway_Invocation
*
* @brief All the action for a synchronous twoway invocation happen
* here.
*
* An object of this is type is created by TAO::Invocation_Adapter
* and invokes a method on this class. The method takes care of
* creating and sending a request, waiting for a reply and
* demarshalling the reply for the client.
*
*/
class TAO_Export Synch_Twoway_Invocation : public Remote_Invocation
{
public:
/// Constructor used by TAO::Invocation_Adapter
/**
* @param otarget The original target on which this invocation
* was started. This is there to be passed up to its parent
* class.
*
* @param resolver The profile and transport holder.
*
* @param detail Operation details of the invocation on the target
*
* @param response_expected Flag to indicate whether the
* operation encapsulated by @a op returns a response or not.
*/
Synch_Twoway_Invocation (CORBA::Object_ptr otarget,
Profile_Transport_Resolver &resolver,
TAO_Operation_Details &detail,
bool response_expected = true);
/// Method used by the adapter to kickstart an invocation to the
/// remote object.
/**
* There is a exception declaration in this method which ensures
* that the exceptions propogated by the remote objects are
* converted a CORBA exceptions for the clients. This method does
* a bunch of things necessary to create and send the
* invocation. This method is also nerve centre for the
* interceptor invocation points.
*/
Invocation_Status remote_twoway (ACE_Time_Value *max_wait_time
ACE_ENV_ARG_DECL)
ACE_THROW_SPEC ((CORBA::Exception));
protected:
/**
* This method is selectively made virtual, so that inherited
* classes can overload the user exception handling type. For
* example the DII needs a totally different method of
* user exception exception handling
*/
virtual Invocation_Status handle_user_exception (TAO_InputCDR &cdr
ACE_ENV_ARG_DECL)
ACE_THROW_SPEC ((CORBA::Exception));
/// Helper method used to handle location forwarded replies.
Invocation_Status location_forward (TAO_InputCDR &cdr
ACE_ENV_ARG_DECL)
ACE_THROW_SPEC ((CORBA::SystemException));
/// Helper method used to handle system exceptions from the remote
/// objects.
Invocation_Status handle_system_exception (TAO_InputCDR &cdr
ACE_ENV_ARG_DECL)
ACE_THROW_SPEC ((CORBA::SystemException));
/// As the name suggests waits for a reply from the remote ORB.
/**
* This method returns an exception when there is an error.
*/
Invocation_Status wait_for_reply (ACE_Time_Value *max_wait_time,
TAO_Synch_Reply_Dispatcher &rd,
TAO_Bind_Dispatcher_Guard &bd
ACE_ENV_ARG_DECL)
ACE_THROW_SPEC ((CORBA::SystemException));
private:
/// Helper method that checks the reply status of the
/// replies and takes appropriate action.
/**
* This method returns an exception when there is an error.
*/
Invocation_Status check_reply_status (
TAO_Synch_Reply_Dispatcher &rd
ACE_ENV_ARG_DECL);
};
/**
* @class Synch_Oneway_Invocation
*
* @brief All the action for a synchronous oneway invocation happen
* here.
*
* This class inherits from twoway invocation for the following
* reasons
*
* - We deal with oneway invocation in more or less the same way as
* two but for waiting for the reply
*
* - For some SYNC_SCOPE policies namely SYNC_WITH_TARGET and
* SYNC_WITH_SERVER the invocation classes have to treat the
* invocation as a twoway invocation (more or less)
*
*/
class TAO_Export Synch_Oneway_Invocation
: public Synch_Twoway_Invocation
{
public:
/// Constructor used by TAO::Invocation_Adapter
/**
* @param otarget The original target on which this invocation
* was started. This is there to be passed up to its parent
* class.
*
* @param resolver The profile and transport holder.
*
* @param detail Operation details of the invocation on the target
*/
Synch_Oneway_Invocation (CORBA::Object_ptr otarget,
Profile_Transport_Resolver &resolver,
TAO_Operation_Details &detail);
/// Method used by the adapter to kickstart an oneway invocation
/// to the remote object.
Invocation_Status remote_oneway (ACE_Time_Value *max_wait_time
ACE_ENV_ARG_DECL)
ACE_THROW_SPEC ((CORBA::Exception));
};
/**
* @class Reply_Guard
*
* @brief A guard class used for storing and forwarding the reply
* status to the portable interceptors.
*/
class TAO_Export Reply_Guard
{
public:
Reply_Guard (Invocation_Base *s,
Invocation_Status is);
/// The destructor calls Invocation_Base::reply_received with the
/// right reply status, which is useful for PI's.
~Reply_Guard (void);
/// Mutator to set the invocation status.
void set_status (Invocation_Status s);
private:
Invocation_Base *invocation_;
Invocation_Status status_;
};
}
#if defined (__ACE_INLINE__)
# include "tao/Synch_Invocation.inl"
#endif /* __ACE_INLINE__ */
#include /**/ "ace/post.h"
#endif /*TAO_SYNCH_INVOCATION_H*/
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