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/* -*- C++ -*- */
//=============================================================================
/**
* @file Blob.h
*
* This is the ACE_Blob class, which is the API for doing file
* uploads/downloads.
*
* @author Prashant Jain and Sumedh Mungee
*/
//=============================================================================
#ifndef ACE_BLOB_H
#define ACE_BLOB_H
#include "ace/config-all.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
#include "ace/INET_Addr.h"
#include "ace/Svc_Handler.h"
#include "ace/SOCK_Connector.h"
#include "ace/Connector.h"
#include "ace/Message_Block.h"
#include "Blob_Handler.h"
/**
* @class ACE_Blob
*
* @brief Blob is intended to provide application API to
* classes that wish to do network i/o at a very
* high level of abstraction.
* = This class provides the ability to retrieve data from
* the network, of specified length and offset, and potentially
* use any protocol "under the hood" to do so. It currently
* uses HTTP. See Blob_Handler also.
*/
class ACE_Blob
{
public:
ACE_Blob (void);
~ACE_Blob (void);
/// initializes the class with the given filename, hostname and port.
/// it should be called with the filename, before any read/write calls
int open (const ACE_TCHAR *filename,
const ACE_TCHAR *hostname = ACE_DEFAULT_SERVER_HOST,
u_short port = 80);
/**
* starts a connection, and reads a file from the server,
* of length and offset as specified, into Message_Block mb
* The message block should have capacity to hold length number
* of bytes
*/
int read (ACE_Message_Block *mb, size_t length, size_t offset);
/**
* starts a connection, and writes a file to the server,
* of length and offset as specified, from Message_Block mb
* thus the message block should contain atleast length + offset
* bytes of data
*/
int write (ACE_Message_Block *mb, size_t length, size_t offset);
/// Frees memory allocated for filename.
int close ();
private:
/// store the internet address of the server
ACE_INET_Addr inet_addr_;
/// The filename
ACE_TCHAR *filename_;
/// The connector endpoint to initiate the client connection
ACE_Connector<ACE_Blob_Handler, ACE_SOCK_CONNECTOR> connector_;
};
#endif /* ACE_BLOB_H */
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