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
169
170
171
172
173
174
175
176
177
|
/* -*- C++ -*- */
// $Id$
// ============================================================================
//
// = LIBRARY
// ace
//
// = FILENAME
// Cached_Connect_Strategy_T.h
//
// = AUTHOR
// Kirthika Parameswaran <kirthika@cs.wustl.edu>
//
// ============================================================================
#ifndef CACHED_CONNECT_STRATEGY_T_H
#define CACHED_CONNECT_STRATEGY_T_H
#include "ace/OS.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
#define ACE_LACKS_PRAGMA_ONCE
#endif /* ACE_LACKS_PRAGMA_ONCE */
#include "ace/Strategies_T.h"
#include "ace/Hash_Cache_Map_Manager_T.h"
#include "ace/Caching_Strategies_T.h"
#include "ace/Functor_T.h"
#include "ace/Pair_T.h"
#include "ace/Synch.h"
template <class SVC_HANDLER, ACE_PEER_CONNECTOR_1, class CACHING_STRATEGY, class ATTRIBUTES, class MUTEX>
class ACE_Cached_Connect_Strategy_Ex : public ACE_Cached_Connect_Strategy<SVC_HANDLER, ACE_PEER_CONNECTOR_2, MUTEX>
{
// = TITLE
// A connection strategy which caches connections to peers
// (represented by <SVC_HANDLER> instances), thereby allowing
// subsequent re-use of unused, but available, connections.
//
// = DESCRIPTION
// <Cached_Connect_Strategy> is intended to be used as a
// plug-in connection strategy for <ACE_Strategy_Connector>.
// It's added value is re-use of established connections and
// tweaking the role of the cache as per the caching strategy.
public:
ACE_Cached_Connect_Strategy_Ex (CACHING_STRATEGY &caching_s,
ACE_Creation_Strategy<SVC_HANDLER> *cre_s = 0,
ACE_Concurrency_Strategy<SVC_HANDLER> *con_s = 0,
ACE_Recycling_Strategy<SVC_HANDLER> *rec_s = 0,
MUTEX *lock = 0,
int delete_lock = 0);
// Constructor
virtual ~ACE_Cached_Connect_Strategy_Ex (void);
// Destructor
virtual int purge_connections (void);
// Explicit purging of connection entries from the connection cache.
// = Typedefs for managing the map
typedef ACE_Refcounted_Hash_Recyclable<ACE_PEER_CONNECTOR_ADDR>
REFCOUNTED_HASH_RECYCLABLE_ADDRESS;
typedef ACE_Hash_Cache_Map_Manager<REFCOUNTED_HASH_RECYCLABLE_ADDRESS,
SVC_HANDLER *,
ACE_Hash<REFCOUNTED_HASH_RECYCLABLE_ADDRESS>,
ACE_Equal_To<REFCOUNTED_HASH_RECYCLABLE_ADDRESS>,
CACHING_STRATEGY,
ATTRIBUTES>
CONNECTION_CACHE;
typedef ACE_TYPENAME CONNECTION_CACHE::CACHE_ENTRY
CONNECTION_CACHE_ENTRY;
typedef ACE_TYPENAME CONNECTION_CACHE::key_type
KEY;
typedef ACE_TYPENAME CONNECTION_CACHE::mapped_type
VALUE;
// = Cleanup of the svc_handler.
typedef ACE_Recyclable_Handler_Cleanup_Strategy<REFCOUNTED_HASH_RECYCLABLE_ADDRESS,
ACE_Pair<SVC_HANDLER *, ATTRIBUTES>,
ACE_Hash_Map_Manager_Ex<REFCOUNTED_HASH_RECYCLABLE_ADDRESS,
ACE_Pair<SVC_HANDLER *, ATTRIBUTES>,
ACE_Hash<REFCOUNTED_HASH_RECYCLABLE_ADDRESS>,
ACE_Equal_To<REFCOUNTED_HASH_RECYCLABLE_ADDRESS>,
MUTEX> >
CLEANUP_STRATEGY;
typedef ACE_Cached_Connect_Strategy<SVC_HANDLER, ACE_PEER_CONNECTOR_2, MUTEX>
CCSBASE;
// = Accessor.
CACHING_STRATEGY &caching_strategy (void);
protected:
int find (ACE_Refcounted_Hash_Recyclable<ACE_PEER_CONNECTOR_ADDR> &search_addr,
ACE_Hash_Map_Entry<ACE_Refcounted_Hash_Recyclable<ACE_PEER_CONNECTOR_ADDR>, ACE_Pair<SVC_HANDLER *, ATTRIBUTES> > *&entry);
// Find an idle handle.
virtual int purge_i (const void *recycling_act);
// Remove from cache (non-locking version).
virtual int cache_i (const void *recycling_act);
// Add to cache (non-locking version).
virtual int mark_as_closed_i (const void *recycling_act);
// Mark as closed (non-locking version).
virtual int cleanup_hint_i (const void *recycling_act);
// Cleanup hint.
// = Helpers
virtual int check_hint_i (SVC_HANDLER *&sh,
const ACE_PEER_CONNECTOR_ADDR &remote_addr,
ACE_Time_Value *timeout,
const ACE_PEER_CONNECTOR_ADDR &local_addr,
int reuse_addr,
int flags,
int perms,
ACE_Hash_Map_Entry<ACE_Refcounted_Hash_Recyclable<ACE_PEER_CONNECTOR_ADDR>, ACE_Pair<SVC_HANDLER *, ATTRIBUTES> > *&entry,
int &found);
virtual int find_or_create_svc_handler_i (SVC_HANDLER *&sh,
const ACE_PEER_CONNECTOR_ADDR &remote_addr,
ACE_Time_Value *timeout,
const ACE_PEER_CONNECTOR_ADDR &local_addr,
int reuse_addr,
int flags,
int perms,
ACE_Hash_Map_Entry<ACE_Refcounted_Hash_Recyclable<ACE_PEER_CONNECTOR_ADDR>, ACE_Pair<SVC_HANDLER *, ATTRIBUTES> > *&entry,
int &found);
virtual int connect_svc_handler_i (SVC_HANDLER *&sh,
const ACE_PEER_CONNECTOR_ADDR &remote_addr,
ACE_Time_Value *timeout,
const ACE_PEER_CONNECTOR_ADDR &local_addr,
int reuse_addr,
int flags,
int perms,
int &found);
virtual int cached_connect (SVC_HANDLER *&sh,
const ACE_PEER_CONNECTOR_ADDR &remote_addr,
ACE_Time_Value *timeout,
const ACE_PEER_CONNECTOR_ADDR &local_addr,
int reuse_addr,
int flags,
int perms);
// Connection of the svc_handler with the remote host. This method
// also encapsulates the connection done with auto_purging under the
// hood. If the connect failed due to the process running out of
// file descriptors then, auto_purging of some connections are done
// from the CONNECTION_CACHE. This frees the descriptors which get
// used in the connect process and hence the connect operation can
// succeed.
CONNECTION_CACHE connection_cache_;
// Table that maintains the cache of connected <SVC_HANDLER>s.
};
#if !defined (ACE_LACKS_INLINE_FUNCTIONS)
#include "ace/Cached_Connect_Strategy_T.i"
#endif /* ACE_LACKS_INLINE_FUNCTIONS */
#if defined (ACE_TEMPLATES_REQUIRE_SOURCE)
#include "ace/Cached_Connect_Strategy_T.cpp"
#endif /* ACE_TEMPLATES_REQUIRE_SOURCE */
#if defined (ACE_TEMPLATES_REQUIRE_PRAGMA)
#pragma implementation ("Cached_Connect_Strategy_T.cpp")
#endif /* ACE_TEMPLATES_REQUIRE_PRAGMA */
#endif /* CACHED_CONNECT_STRATEGY_T_H */
|
