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// -*- C++ -*-
// $Id$
// ============================================================================
//
// = LIBRARY
// AMI_Iterator
//
// = FILENAME
// Iterator_Handler.h
//
// = DESCRIPTION
// Header file for the Web_Server::AMI_Content_IteratorHandler
// implementation.
//
// = AUTHOR
// Ossama Othman <ossama@uci.edu>
//
// ============================================================================
#ifndef ITERATOR_HANDLER_H
#define ITERATOR_HANDLER_H
#include "ace/FILE_Addr.h"
#include "ace/FILE_IO.h"
#include "Web_ServerS.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
class Iterator_Handler
: public virtual POA_Web_Server::AMI_Content_IteratorHandler
{
// = TITLE
// The AMI reply handler for replies from the Content_Iterator.
//
// = DESCRIPTION
// This class handles all asynchronously received replies from
// the Content_Iterator on the server side. Once a reply is
// handled, another asynchronous request is made to the
// Content_Iterator. This ensures that chunks of data are
// received in the proper order, and also takes advantage of
// asyncronous method invocations.
friend class Iterator_Handler_Friend;
// Dummy friend class declaration to quiet down a warning.
public:
Iterator_Handler (void);
// Constructor that creates a content iterator corresponding to the
// name of the file being retrieved from the web server.
virtual void next_chunk (CORBA::Boolean pending_data,
const Web_Server::Chunk_Type & chunk);
virtual void next_chunk_excep (
::Messaging::ExceptionHolder *)
{}
virtual void destroy (void);
virtual void destroy_excep (
::Messaging::ExceptionHolder *)
{}
void run (int *request_count,
const char *pathname,
Web_Server::Iterator_Factory_ptr factory);
// 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:
~Iterator_Handler (void);
// Destructor (private to ensure that Iterator_Handler is allocated
// on the heap).
void initialize_content_iterator (const char *pathname,
Web_Server::Iterator_Factory_ptr factory);
// Initialize the Content Iterator used to retrieve the file.
void deactivate (void);
// Deactivate this reply handler.
int get_viewer (char *viewer, size_t length);
// Get the name of the viewer associated with the file being
// retrieved.
int spawn_viewer (void);
// Spawn an external view to display the retrieved file.
private:
ACE_FILE_Addr file_;
// The Addr corresponding to the retrieved file.
ACE_FILE_IO file_io_;
// The object that provides all file related IO operations
// (e.g. read, write, etc).
Web_Server::Content_Iterator_var contents_;
// The iterator used to obtain individual chunks of data from the
// web server.
Web_Server::Metadata_Type_var metadata_;
// The metadata associated with the file being retrieved from the
// web server.
CORBA::ULong offset_;
// The offset from the beginning of the file, the next chunk of data
// should be read from.
Web_Server::AMI_Content_IteratorHandler_var ami_handler_;
// Reference to this Reply Handler's self.
int *request_count_;
// Pointer to external status monitoring variable. The contents (not
// the pointer itself) of the<pending_data> parameter will be
// decremented when file retrieval has completed.
};
#endif /* ITERATOR_HAHNDLER_H */
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