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/* -*- C++ -*- */
//=============================================================================
/**
* @file Blob_Handler.h
*
* $Id$
*
* ACE_Blob_Handler is a base class for ACE_Blob_Reader and
* ACE_Blob_Writer which are created in response to calls to
* read/write, as appropriate
*
*
* @author Prashant Jain and Sumedh Mungee
*/
//=============================================================================
#ifndef ACE_BLOB_HANDLER_H
#define ACE_BLOB_HANDLER_H
#include "ace/config-all.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
#include "ace/SOCK_Stream.h"
#include "ace/Svc_Handler.h"
#include "ace/Message_Block.h"
/**
* @class ACE_Blob_Handler
*
* @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_Handler : public ACE_Svc_Handler <ACE_SOCK_STREAM, ACE_NULL_SYNCH>
{
public:
/// Null constructor, insures that it works properly with Connector
ACE_Blob_Handler (void);
/// Always use this constructor to make Blob_Handlers
ACE_Blob_Handler (ACE_Message_Block *mb,
size_t length,
size_t offset,
ACE_TCHAR *filename);
/// returns the number of bytes read/written in the last operation.
int byte_count (void);
/// Activate this instance of the <ACE_Blob_Handler>
virtual int open (void * = 0);
/// Close down the Blob
virtual int close (u_long flags = 0);
~ACE_Blob_Handler (void);
protected:
virtual int send_request (void);
virtual int receive_reply (void);
ACE_Message_Block *mb_;
size_t length_;
size_t offset_;
ACE_TCHAR *filename_;
int bytecount_;
enum
{
MAX_HEADER_SIZE = 2048
// The handler assumes that the first 2048 bytes of a server response
// contains the header
};
};
class ACE_Blob_Reader : public ACE_Blob_Handler
{
public:
ACE_Blob_Reader (ACE_Message_Block *mb,
size_t length,
size_t offset,
ACE_TCHAR *filename,
const char *request_prefix = "GET",
const char *request_suffix = "HTTP/1.0\r\n\r\n");
private:
int send_request (void);
int receive_reply (void);
const char *request_prefix_;
const char *request_suffix_;
};
class ACE_Blob_Writer : public ACE_Blob_Handler
{
public:
ACE_Blob_Writer (ACE_Message_Block *mb,
size_t length,
size_t offset,
ACE_TCHAR *filename,
const char *request_prefix = "PUT",
const char *request_suffix = "HTTP/1.0\nContent-length:");
private:
int send_request (void);
int receive_reply (void);
const char *request_prefix_;
const char *request_suffix_;
};
#endif /* ACE_BLOB_HANDLER_H */
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