// -*- Mode: C++; -*-
//                            Package   : omniORB
// callDescriptor.h           Created on: 12/98
//                            Author    : David Riddoch (djr)
//
//    Copyright (C) 2003-2008 Apasphere Ltd
//    Copyright (C) 1996-1999 AT&T Research Cambridge
//
//    This file is part of the omniORB library.
//
//    The omniORB library is free software; you can redistribute it and/or
//    modify it under the terms of the GNU Library General Public
//    License as published by the Free Software Foundation; either
//    version 2 of the License, or (at your option) any later version.
//
//    This library is distributed in the hope that it will be useful,
//    but WITHOUT ANY WARRANTY; without even the implied warranty of
//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
//    Library General Public License for more details.
//
//    You should have received a copy of the GNU Library General Public
//    License along with this library; if not, write to the Free
//    Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  
//    02111-1307, USA
//
//
// Description:
//

/*
 $Log: callDescriptor.h,v $
 Revision 1.4.2.6  2009/05/06 16:16:14  dgrisby
 Update lots of copyright notices.

 Revision 1.4.2.5  2008/10/28 15:33:42  dgrisby
 Undeclared user exceptions not caught in local calls.

 Revision 1.4.2.4  2006/07/02 22:52:05  dgrisby
 Store self thread in task objects to avoid calls to self(), speeding
 up Current. Other minor performance tweaks.

 Revision 1.4.2.3  2006/06/05 11:27:01  dgrisby
 Accessor method to change oneway-ness of a call descriptor.

 Revision 1.4.2.2  2003/11/06 11:56:55  dgrisby
 Yet more valuetype. Plain valuetype and abstract valuetype are now working.

 Revision 1.4.2.1  2003/03/23 21:04:17  dgrisby
 Start of omniORB 4.1.x development branch.

 Revision 1.2.2.15  2003/01/16 12:47:08  dgrisby
 Const cast macro. Thanks Matej Kenda.

 Revision 1.2.2.14  2003/01/14 11:48:15  dgrisby
 Remove warnings from gcc -Wshadow. Thanks Pablo Mejia.

 Revision 1.2.2.13  2001/11/06 15:41:35  dpg1
 Reimplement Context. Remove CORBA::Status. Tidying up.

 Revision 1.2.2.12  2001/09/03 16:49:43  sll
 Added the deadline parameter and access functions.

 Revision 1.2.2.11  2001/09/03 13:28:09  sll
 In the calldescriptor, in addition to the first address, record the current
 address in use.

 Revision 1.2.2.10  2001/08/17 17:01:16  sll
 Removed assert existent flag in the call descriptor.

 Revision 1.2.2.9  2001/08/17 13:42:48  dpg1
 callDescriptor::userException() no longer has to throw an exception.

 Revision 1.2.2.8  2001/08/15 10:26:07  dpg1
 New object table behaviour, correct POA semantics.

 Revision 1.2.2.7  2001/06/07 16:24:07  dpg1
 PortableServer::Current support.

 Revision 1.2.2.6  2001/05/29 17:03:47  dpg1
 In process identity.

 Revision 1.2.2.5  2001/04/18 17:50:44  sll
 Big checkin with the brand new internal APIs.
 Scoped where appropriate with the omni namespace.

 Revision 1.2.2.4  2000/11/03 19:00:26  sll
 Removed Suppress_Spurious_gcc_Warnings cpp macro.

 Revision 1.2.2.3  2000/10/06 16:47:26  sll
 Removed inline marshal function from the client and server marshaller.

 Revision 1.2.2.2  2000/09/27 17:18:35  sll
 Updated to use the new cdrStream abstraction.
 Added new member unmarshalArguments(), marshalReturnedValues() and modified
 the ctor arguments to make the omniCallDescriptor class suitable for use in
 the upcalls on the server side.

 Revision 1.2.2.1  2000/07/17 10:35:34  sll
 Merged from omni3_develop the diff between omni3_0_0_pre3 and omni3_0_0.

 Revision 1.3  2000/07/13 15:26:05  dpg1
 Merge from omni3_develop for 3.0 release.

 Revision 1.1.2.1  1999/09/24 09:51:43  djr
 Moved from omniORB2 + some new files.

*/

#ifndef __OMNIORB_CALLDESCRIPTOR_H__
#define __OMNIORB_CALLDESCRIPTOR_H__

class omniObjRef;
class omniServant;
class omniCurrent;

OMNI_NAMESPACE_BEGIN(omni)
class omniOrbPOA;
class giopAddress;
OMNI_NAMESPACE_END(omni)

//////////////////////////////////////////////////////////////////////
///////////////////////// omniCallDescriptor /////////////////////////
//////////////////////////////////////////////////////////////////////

class omniCallDescriptor {
public:
  typedef void (*LocalCallFn)(omniCallDescriptor*, omniServant*);

  inline omniCallDescriptor(LocalCallFn lcfn, const char* op_,
			    int op_len_, _CORBA_Boolean oneway,
			    const char*const* user_excns_,
			    int n_user_excns_,
                            _CORBA_Boolean is_upcall_)
    : pd_localCall(lcfn),
      pd_op(op_), pd_oplen(op_len_),
      pd_user_excns(user_excns_),
      pd_n_user_excns(n_user_excns_),
      pd_is_oneway(oneway),
      pd_is_upcall(is_upcall_),
      pd_contains_values(0),
      pd_first_address_used(0),
      pd_current_address(0),
      pd_objref(0),
      pd_poa(0),
      pd_localId(0),
      pd_deadline_secs(0),
      pd_deadline_nanosecs(0) {}

  virtual ~omniCallDescriptor() {}

  //////////////////////////////////////////////////
  // Methods to implement call on the client side //
  //////////////////////////////////////////////////

  virtual void initialiseCall(cdrStream&);

  virtual void marshalArguments(cdrStream&);
  // Defaults to no arguments.

  virtual void unmarshalReturnedValues(cdrStream&);
  // Defaults to no arguments and returns void.

  virtual void userException(cdrStream& stream, _OMNI_NS(IOP_C)* iop_client,
			     const char*);
  // Called on the client side to handle a user exception.
  // Defaults to no user exceptions, and thus throws CORBA::UNKNOWN.
  // Most versions of this throw either a user exception or
  // CORBA::UNKNOWN, but it is permitted to return successfully. This
  // is done by DII, for example.
  // If iop_client is non-zero, must call iop_client->RequestCompleted().

  void validateUserException(const CORBA::UserException& ex);
  // Called to validate a user exception in a local call. If the call
  // descriptor knows the exception is not valid for the call, throws
  // CORBA::UNKNOWN. If the exception is valid, or the call descriptor
  // does not know, returns.


  //////////////////////////////////////////////////
  // Methods to implement call on the server side //
  //////////////////////////////////////////////////
  virtual void unmarshalArguments(cdrStream&);
  // Defaults to no arguments.

  virtual void marshalReturnedValues(cdrStream&);
  // Defaults to no arguments and returns void.

  ///////////////
  // Accessors //
  ///////////////

  inline const char* op() const           { return pd_op;        }
  inline size_t op_len() const            { return pd_oplen;     }
  inline _CORBA_Boolean is_oneway() const { return pd_is_oneway; }

  inline void set_oneway(_CORBA_Boolean o) { pd_is_oneway = o; }

  inline void doLocalCall(omniServant* servant) {
    pd_localCall(this, servant);
  }
  inline const char*const* user_excns() { return pd_user_excns; }
  inline int n_user_excns() { return pd_n_user_excns; }
  inline _CORBA_Boolean is_upcall() const { return pd_is_upcall; }
  inline _CORBA_Boolean haslocalCallFn() const { return (pd_localCall)?1:0; }
  inline const _OMNI_NS(giopAddress)* firstAddressUsed() { 
    return pd_first_address_used;
  }

  inline void firstAddressUsed(const _OMNI_NS(giopAddress)* a) { 
    pd_first_address_used = a;
  }

  inline const _OMNI_NS(giopAddress)* currentAddress() { 
    return pd_current_address;
  }

  inline void currentAddress(const _OMNI_NS(giopAddress)* a) { 
    pd_current_address = a;
  }

  inline void getDeadline(unsigned long& secs, unsigned long& nanosecs) const {
    secs = pd_deadline_secs;
    nanosecs = pd_deadline_nanosecs;
  }

  inline void setDeadline(unsigned long secs, unsigned long nanosecs) {
    pd_deadline_secs = secs;
    pd_deadline_nanosecs = nanosecs;
  }

  inline void containsValues(_CORBA_Boolean v) {
    pd_contains_values = v;
  }
  inline _CORBA_Boolean containsValues() {
    return pd_contains_values;
  }
  // If pd_contains_values is true, the arguments / return values
  // contain valuetypes. The spec requires that values are always
  // passed by value, so local calls must make copies. Since values
  // can be shared by separate arguments, the whole argument list must
  // be copied in a single operation. We do this by marshalling via a
  // temprary memory buffer. This is slow, so it can be turned off by
  // setting the copyValuesInLocalCalls parameter to false.


  /////////////////////
  // Current support //
  /////////////////////

  inline void objref(omniObjRef* o)           { pd_objref = o; }
  inline omniObjRef* objref()                 { return pd_objref; }
  inline void poa(_OMNI_NS(omniOrbPOA*) poa_) { pd_poa = poa_; }
  inline _OMNI_NS(omniOrbPOA*) poa()          { return pd_poa; }
  inline void localId(omniLocalIdentity* lid) { pd_localId = lid; }
  inline omniLocalIdentity* localId()         { return pd_localId; }

private:
  LocalCallFn                  pd_localCall;
  const char*                  pd_op;
  size_t                       pd_oplen;
  const char*const*            pd_user_excns;
  int                          pd_n_user_excns;
  _CORBA_Boolean               pd_is_oneway;
  _CORBA_Boolean               pd_is_upcall;
  _CORBA_Boolean               pd_contains_values;

  const _OMNI_NS(giopAddress)* pd_first_address_used;
  const _OMNI_NS(giopAddress)* pd_current_address;
  // state holder for the giop transport in relation to this call. Not
  // manipulated by this class other than the access functions.
  // Initialised to 0 in ctor.

  /////////////////////
  // Current support //
  /////////////////////

  omniCurrent*                 pd_current;
  omniCallDescriptor*          pd_current_next;
  // The omniCurrent object maintains a stack of call descriptors,
  // representing nested colocated calls. These pointers are
  // maintained by functions in omniCurrent.

  omniObjRef*                  pd_objref;
  // This is set on the client side to indicate the object reference
  // invoked on. It is used for two things: 1. to check if a servant
  // found by the in process identity can be used in a direct local
  // call; 2. as the return value from PortableServer::Current::
  // get_reference(). In the case of a remote upcall, this is zero,
  // and an objref is constructed from information in the local id on
  // request.

  _OMNI_NS(omniOrbPOA*)        pd_poa;
  omniLocalIdentity*           pd_localId;
  // Both always set on the way through the POA during an upcall.

  ////////////////////////////
  // Deadline for this call //
  ////////////////////////////
  // This is a state holder for the call. Not manipulated by this class
  // other than the access functions. Initialised to 0 in ctor.
  unsigned long                pd_deadline_secs;
  unsigned long                pd_deadline_nanosecs;

  omniCallDescriptor(const omniCallDescriptor&);
  omniCallDescriptor& operator = (const omniCallDescriptor&);
  // Not implemented.
};


//////////////////////////////////////////////////////////////////////
/////////////////////////// omniStdCallDesc //////////////////////////
//////////////////////////////////////////////////////////////////////

//  This just provides a namespace for pre-defined call descriptors.

class omniStdCallDesc {
public:

  // Mangled signature: void
  typedef omniCallDescriptor void_call;

  // Mangled signature: _cCORBA_mObject_i_cstring
  class _cCORBA_mObject_i_cstring : public omniCallDescriptor {
  public:
    inline _cCORBA_mObject_i_cstring(LocalCallFn lcfn, const char* op_,
		     size_t oplen, const char* a_0,
		     _CORBA_Boolean upcall=0) :
      omniCallDescriptor(lcfn, op_, oplen, 0, 0, 0, upcall),
      arg_0( OMNI_CONST_CAST(char*, a_0) ) {}
 
    inline ~_cCORBA_mObject_i_cstring() {
      if (is_upcall()) { 
	_CORBA_String_helper::free(arg_0);
      }
    }

    void marshalArguments(cdrStream&);
    void unmarshalReturnedValues(cdrStream&);
    void unmarshalArguments(cdrStream&);
    void marshalReturnedValues(cdrStream&);
 
    inline CORBA::Object_ptr result() { return pd_result._retn(); }
 
    char* arg_0;
    CORBA::Object_var pd_result;
  };

};


//////////////////////////////////////////////////////////////////////
///////////////////// omniLocalOnlyCallDescriptor ////////////////////
//////////////////////////////////////////////////////////////////////

//  This class is needed to support calls to objects which
// may only reside in the local address space.
// eg. ServantLocator, ServantActivator, AdapterActivator.

class omniLocalOnlyCallDescriptor : public omniCallDescriptor {
public:
  omniLocalOnlyCallDescriptor(LocalCallFn lcfn, const char* op_,
			      int op_len_, _CORBA_Boolean is_oneway_ = 0)
    : omniCallDescriptor(lcfn, op_, op_len_, is_oneway_, 0, 0, 0) {}

  // Only useful as client side descriptor. No set up for server side upcall.

  // We only need to override this one -- as it will throw an
  // exception, so the other members won't get called.
  void marshalArguments(cdrStream&);
};

#endif  // __OMNIORB_CALLDESCRIPTOR_H__
