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// -*- C++ -*-
//=============================================================================
/**
* @file Iterator_Handler.h
*
* $Id$
*
* 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.
/// Dummy friend class declaration to quiet down a warning.
friend class Iterator_Handler_Friend;
public:
/// Constructor that creates a content iterator corresponding to the
/// name of the file being retrieved from the web server.
Iterator_Handler (void);
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 *)
{}
/**
* 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.
*/
void run (int *request_count,
const char *pathname,
Web_Server::Iterator_Factory_ptr factory);
private:
/// Destructor (private to ensure that Iterator_Handler is allocated
/// on the heap).
~Iterator_Handler (void);
/// Initialize the Content Iterator used to retrieve the file.
void initialize_content_iterator (const char *pathname,
Web_Server::Iterator_Factory_ptr factory);
/// Deactivate this reply handler.
void deactivate (void);
/// Get the name of the viewer associated with the file being
/// retrieved.
int get_viewer (char *viewer, size_t length);
/// Spawn an external view to display the retrieved file.
int spawn_viewer (void);
private:
/// The Addr corresponding to the retrieved file.
ACE_FILE_Addr file_;
/// The object that provides all file related IO operations
/// (e.g. read, write, etc).
ACE_FILE_IO file_io_;
/// The iterator used to obtain individual chunks of data from the
/// web server.
Web_Server::Content_Iterator_var contents_;
/// The metadata associated with the file being retrieved from the
/// web server.
Web_Server::Metadata_Type_var metadata_;
/// The offset from the beginning of the file, the next chunk of data
/// should be read from.
CORBA::ULong offset_;
/// Reference to this Reply Handler's self.
Web_Server::AMI_Content_IteratorHandler_var ami_handler_;
/**
* 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.
*/
int *request_count_;
};
#endif /* ITERATOR_HAHNDLER_H */
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