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// -*- C++ -*-
// $Id$
// ============================================================================
//
// = LIBRARY
// AMI_Observer
//
// = FILENAME
// Push_Iterator_Handler.h
//
// = DESCRIPTION
// Header file for the AMI_Iterator_FactoryHandler implementation.
//
// = AUTHOR
// Ossama Othman <ossama@uci.edu>
//
// ============================================================================
#ifndef PUSH_ITERATOR_HANDLER_H
#define PUSH_ITERATOR_HANDLER_H
#include "Push_Web_ServerS.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
// Forward declaration
class Callback_i;
class Push_Iterator_Handler
: public virtual POA_Web_Server::AMI_Iterator_FactoryHandler
{
// = TITLE
// Implement the Web_Server::Iterator_Factory AMI Reply Handler.
//
// = DESCRIPTION
// This classes asynchronously registers a reference to the
// client-side <Callback> object in the Content Server. Once
// registered, the <Callback> will begin receiving chunks of data
// pushed from the Content Server.
//
// Since registration occurs asynchronously, it is possible that
// the metadata returned from the <Iterator_Factory> will be
// received after the content of the file has been received. The
// <Callback> object is equipped to handle this possibility.
//
// The register_callback() reply handler method in this class
// receives the metadata, and then passes it to the <Callback>
// object. Once the metadata is received, there is no longer any
// use for this <Push_Iterator_Handler> object, and it is
// deactivated.
friend class Push_Iterator_Handler_Friend;
// Dummy friend class declaration to quiet down a warning.
public:
Push_Iterator_Handler (void);
// Constructor that creates a content iterator corresponding to the
// name of the file being retrieved from the web server.
void run (int *request_count,
const char *pathname,
Web_Server::Iterator_Factory_ptr factory
ACE_ENV_ARG_DECL)
ACE_THROW_SPEC ((CORBA::SystemException,
Web_Server::Error_Result));
// Activate and run this Reply Handler. The contents (not the
// pointer itself) of the <request_count> parameter will be
// incremented when file retrieval begins, and decremented when file
// retrieval completes.
private:
~Push_Iterator_Handler (void);
// Destructor (private to ensure that Iterator_Handler is allocated
// on the heap).
virtual void register_callback
(const Web_Server::Metadata_Type &metadata
ACE_ENV_ARG_DECL)
ACE_THROW_SPEC ((CORBA::SystemException));
// AMI callback that is invoked when a response from the
// corresponding server method is received.
virtual void register_callback_excep
(::Messaging::ExceptionHolder *
ACE_ENV_ARG_DECL_NOT_USED)
ACE_THROW_SPEC ((CORBA::SystemException)) {}
void deactivate (ACE_ENV_SINGLE_ARG_DECL)
ACE_THROW_SPEC ((CORBA::SystemException));
// Deactivate this handler.
private:
Callback_i *callback_servant_;
// The servant that accepts data pushed from the content server.
Web_Server::Callback_var callback_;
// Reference to the callback object the server sends data to.
Web_Server::AMI_Iterator_FactoryHandler_var ami_handler_;
// Reference to this Reply Handler's self.
};
#endif /* PUSH_ITERATOR_HANDLER_H */
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