summaryrefslogtreecommitdiff
path: root/ace/Asynch_Connector.h
blob: d7bf516cecfbebeb2d60cf7460a376b2dbbfa0a2 (plain)
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
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
/* -*- C++ -*- */

//=============================================================================
/**
 *  @file    Asynch_Connector.h
 *
 *  $Id$
 *
 *  @author Alexander Libman <alibman@ihug.com.au>
 */
//=============================================================================

#ifndef ACE_ASYNCH_CONNECTOR_H
#define ACE_ASYNCH_CONNECTOR_H
#include /**/ "ace/pre.h"

#include "ace/config-all.h"

#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */

#if (defined (ACE_WIN32) || defined (ACE_HAS_AIO_CALLS)) && !defined(ACE_HAS_WINCE)
// This only works on platforms that support async i/o.

#include "ace/Asynch_IO.h"
#include "ace/INET_Addr.h"

// Forward declarations
class ACE_Message_Block;

/**
 * @class ACE_Asynch_Connector
 *
 * @brief This class is an example of the Connector pattern.  This class
 * will establish new connections and create new HANDLER objects to handle
 * the new connections.
 *
 * Unlike the ACE_Connector, however, this class is designed to
 * be used asynchronously with the ACE Proactor framework.
 */

template <class HANDLER>
class ACE_Asynch_Connector : public ACE_Handler
{
public:
  /// A do nothing constructor.
  ACE_Asynch_Connector (void);

  /// Virtual destruction
  virtual ~ACE_Asynch_Connector (void);

  /**
   * This opens asynch connector
   */
  virtual int open (int pass_addresses = 0,
                    ACE_Proactor *proactor = 0,
                    int validate_new_connection = 1);

  /// This initiates a new asynchronous connect
  virtual int connect (const ACE_INET_Addr &remote_sap,
                       const ACE_INET_Addr &local_sap =
                         (const ACE_INET_Addr &)ACE_Addr::sap_any,
                       int reuse_addr = 1,
                       const void *act = 0);

  /**
   * This cancels all pending accepts operations that were issued by
   * the calling thread.
   *
   * @note On Windows, this method does not cancel connect operations
   *       issued by other threads.
   *
   * @note On POSIX, delegates cancelation to ACE_POSIX_Asynch_Connect.
   */
  virtual int cancel (void);


  /**
   * Template method to validate peer before service is opened.
   * This method is called when the connection attempt completes,
   * whether it succeeded or failed, if the @a validate_connection
   * argument to @c open() was non-zero or the @c validate_new_connection()
   * method is called to turn this feature on.  The default implementation
   * returns 0.  Users can (and probably should) reimplement this method
   * to learn about the success or failure of the connection attempt.
   * If the connection completed successfully, this method can be used to
   * perform validation of the peer using it's address, running an
   * authentication procedure (such as SSL) or anything else necessary or
   * desireable. The return value from this method determines whether or
   * not ACE will continue opening the service or abort the connection.
   *
   * @param result  Result of the connection acceptance. Use
   *                result.success() to determine success or failure of
   *                the connection attempt.
   * @param remote  Peer's address. If the connection failed, this object
   *                is undefined.
   * @param local   Local address connection was completed from. If the
   *                connection failed, this object is undefined.
   *
   * @retval  -1  ACE_Asynch_Connector will close the connection, and
   *              the service will not be opened.
   * @retval  0   Service opening will proceeed.
   * @return  Return value is ignored if the connection attempt failed.
   */
  virtual int validate_connection (const ACE_Asynch_Connect::Result& result,
                                   const ACE_INET_Addr &remote,
                                   const ACE_INET_Addr& local);

  //
  // These are low level tweaking methods
  //

  /// Set and get flag that indicates if parsing and passing of
  /// addresses to the service_handler is necessary.
  virtual int  pass_addresses (void) const;
  virtual void pass_addresses (int new_value);

  /// Set and get flag that indicates if address validation is
  /// required.
  virtual int  validate_new_connection (void) const;
  virtual void validate_new_connection (int new_value);

protected:

  /// This is called when an outstanding accept completes.
  virtual void handle_connect (const ACE_Asynch_Connect::Result &result);


  /// This parses the address from read buffer.
  void parse_address (const ACE_Asynch_Connect::Result &result,
                      ACE_INET_Addr &remote_address,
                      ACE_INET_Addr &local_address);

  /// Return the asynch Connect object.
  ACE_Asynch_Connect & asynch_connect (void);

  /**
   * This is the template method used to create new handler.
   * Subclasses must overwrite this method if a new handler creation
   * strategy is required.
   */
  virtual HANDLER *make_handler (void);

private:

  /// Asynch_Connect used to make life easier :-)
  ACE_Asynch_Connect asynch_connect_;

  /// Flag that indicates if parsing of addresses is necessary.
  int pass_addresses_;

  /// Flag that indicates if address validation is required.
  int validate_new_connection_;

};

#if defined (ACE_TEMPLATES_REQUIRE_SOURCE)
#include "ace/Asynch_Connector.cpp"
#endif /* ACE_TEMPLATES_REQUIRE_SOURCE */

#if defined (ACE_TEMPLATES_REQUIRE_PRAGMA)
#pragma implementation ("Asynch_Connector.cpp")
#endif /* ACE_TEMPLATES_REQUIRE_PRAGMA */

#endif /* ACE_WIN32 || ACE_HAS_AIO_CALLS */
#include /**/ "ace/post.h"
#endif /* ACE_ASYNCH_CONNECTOR_H */