1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
|
/* -*- C++ -*- */
//=============================================================================
/**
* @file HTBP_Inside_Squid_Filter.h
*
* $Id$
*
* @author Phil Mesnier
*/
//=============================================================================
#ifndef ACE_HTBP_INSIDE_SQUID_FILTER_H
#define ACE_HTBP_INSIDE_SQUID_FILTER_H
#include /**/ "ace/pre.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
#include "HTBP_Export.h"
#include "HTBP_Filter.h"
namespace ACE
{
namespace HTBP
{
/**
* @class Inside_Squid_Filter
*
* @brief Defines the methods in the <Filter> abstraction.
*
* A filter is responsible for wrapping / unwrapping messages
* depending on direction of flow on each stream. There will be 4
* filters participating in a session, inside-send, inside-recv,
* outside-send, ouside-recv. It is anticipated that specialized
* filters will be implemented that tune the filter behavior based
* on proxy particulars. That, or there will be a matrix
* configuration parameters that may be tweeked to match the
* configuration. It remains to be seen which is easier to
* manage.
*/
class HTBP_Export Inside_Squid_Filter : public Filter
{
public:
/// Destructor.
virtual ~Inside_Squid_Filter (void);
/// Inside and outside Send filters need to supply a data header
/// that sets the stage before sending the data body, and then
/// (maybe) send a data trailer that closes the message. The
/// data header may be formatted differently on the first
/// message, to send optional context information.
virtual ssize_t send_data_header (ssize_t data_len, Channel *);
virtual ssize_t send_data_trailer (Channel *);
/// Upon receiving data, the Channel is obliged to send an
/// ack. This is either an empty document if this is the
/// in-to-out stream, or a new long-duration document request if
/// this is the out-to-in stream.
virtual int send_ack (Channel *);
virtual int recv_ack (Channel *);
/// receiving data must compliment sending. In the case of an
/// in-to-out stream. It is possible that the stream identity is
/// not known until the first request is received. In this case
/// the filter will have to look lookup the received session ID
/// and either create a new instance or reassign itself to an
/// existing sesion. In that case, the associated stream will
/// have to be reassigned as well.
///
virtual ssize_t recv_data_header (Channel *);
virtual ssize_t recv_data_trailer(Channel *);
private:
int make_request_header (Channel *, const char *, char *, size_t );
};
}
}
#if defined (__ACE_INLINE__)
#include "HTBP_Inside_Squid_Filter.inl"
#endif
#include /**/ "ace/post.h"
#endif /* ACE_HTBP_FILTER_H */
|
