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
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
|
// -*- C++ -*-
//=============================================================================
/**
* @file Logging_Strategy.h
*
* $Id$
*
* @author Prashant Jain <pjain@cs.wustl.edu>
* @author Orlando Ribeiro <oribeiro@inescporto.pt>
*/
//=============================================================================
#ifndef ACE_LOGGING_STRATEGY_H
#define ACE_LOGGING_STRATEGY_H
#include "ace/Service_Object.h"
#include "ace/Log_Msg.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
#if !defined (ACE_DEFAULT_LOGFILE_POLL_INTERVAL)
#define ACE_DEFAULT_LOGFILE_POLL_INTERVAL 600 /* Seconds */
#endif /* ACE_DEFAULT_LOGFILE_POLL_INTERVAL */
ACE_BEGIN_VERSIONED_NAMESPACE_DECL
/**
* @class ACE_Logging_Strategy
*
* @brief This class provides a way to dynamically configure the ACE logging
* mechanism at run time as well as enable the mechanisms for limiting
* log file size and log file backup/rotation capability.
*
* Depending upon when this service is invoked and with what
* flags, the output of other network services can be
* controlled. The output can be streamed to stderr, to a file,
* to a logging daemon, or it can be set to be "silent".
* If logging records are output to a file, the file can be set
* to a maximum size and repeatedly split into new files. The
* log file size can be limited at any logging point (i.e.,
* application, client logging daemon, or server logging daemon)
* by specifying the -i @param sample_interval_in_secs and -m
* @param max_size_in_KB options for the Logging_Strategy class in a
* svc.conf file.
*
* By default, two logfiles are generated. It's possible, however, to
* generate as many logfiles as necessary to store all the
* information. To achieve this, it is only necessary to indicate the
* maximum size of the logfiles via the -m option and the process will
* generate automatically the logfiles. You can control the total
* number of logfiles created via the -n option.
*
* By using the -o option we can also choose the mode of organization
* of the files, e.g., the first one is the normal used in Unix
* systems (when cron rotates the logs it keeps the lowest number the
* most recent one), the second is for increasing speed (we only
* create a new log file, and don't rotate the others (fewer accesses
* to disk)).
*
* By default, the @c ACE_Logging_Strategy uses the singleton reactor,
* i.e., what's returned by @c ACE_Reactor::instance(). If you want
* to set the reactor used by @c ACE_Logging_Strategy to something
* other than the singleton reactor you'll need to get a pointer to
* the @c ACE_Logging_Strategy instance and do this
*
* ACE_Reactor my_reactor;
* ACE_Logging_Strategy *logging_strategy = ...... // Get instance.
*
* logging_strategy->reactor (&my_reactor);
*
* and then logging_strategy will use your reactor. If you're
* dynamically linking the @c ACE_Logging_Strategy then you can use
* the @c ACE_Dynamic_Service template to get a pointer to the
* @c ACE_Logging_Strategy.
*/
class ACE_Export ACE_Logging_Strategy : public ACE_Service_Object
{
public:
/// Constructor.
ACE_Logging_Strategy (void);
/// Destructor.
~ACE_Logging_Strategy (void);
/// Dynamic linking initialization hook.
virtual int init (int argc, ACE_TCHAR *argv[]);
/// Dynamic linking termination hook.
virtual int fini (void);
/**
* Timeout handler which tests logfile size. If the current logfile
* size exceeds <max_size_>, the current logfile is closed, saved to
* logfile.old, and a new logfile is reopened.
*/
virtual int handle_timeout (const ACE_Time_Value& tv,
const void* arg);
/**
* Parse arguments provided in svc.conf file.
* @arg '-f' Pass in the flags (such as OSTREAM, STDERR, LOGGER, VERBOSE,
* SILENT, VERBOSE_LITE) used to control logging.
* @arg '-i' The interval (in seconds) at which the logfile size is sampled
* (default is 0, i.e., do not sample by default).
* @arg '-k' Set the logging key.
* @arg '-m' Maximum logfile size in Kbytes.
* @arg '-n' Set the program name for the %n format specifier.
* @arg '-N' The maximum number of logfiles that we want created.
* @arg '-o' Specifies that we want the no standard logfiles ordering
* (fastest processing in <handle_timeout>). Default is not to
* order logfiles.
* @arg '-p' Pass in the process-wide priorities to either enable (e.g.,
* DEBUG, INFO, WARNING, NOTICE, ERROR, CRITICAL, ALERT,
* EMERGENCY) or to disable (e.g., ~DEBUG, ~INFO, ~WARNING,
* ~NOTICE, ~ERROR, ~CRITICAL, ~ALERT, ~EMERGENCY).
* @arg '-s' Ensure that the OSTREAM flag is set and log to the @a filename.
* @arg '-t' Pass in the thread-wide priorities to either enable (e.g.,
* DEBUG, INFO, WARNING, NOTICE, ERROR, CRITICAL, ALERT,
* EMERGENCY) or to disable (e.g., ~DEBUG, ~INFO, ~WARNING,
* ~NOTICE, ~ERROR, ~CRITICAL, ~ALERT, ~EMERGENCY).
* @arg '-w' Cause the logfile to be wiped out, both on startup and on
* reconfiguration.
*/
int parse_args (int argc, ACE_TCHAR *argv[]);
void log_msg (ACE_Log_Msg *log_msg);
protected:
/// Tokenize to set all the flags
void tokenize (ACE_TCHAR *flag_string);
/// Tokenize to set priorities (either process or thread one).
void priorities (ACE_TCHAR *priority_string,
ACE_Log_Msg::MASK_TYPE mask);
/// Current thread's priority mask set by <priorities>
u_long thread_priority_mask_;
/// Process-wide priority mask set by <priorities>
u_long process_priority_mask_;
/// Flags we keep track of.
u_long flags_;
/// File name we're logging to.
ACE_TCHAR *filename_;
/// Logger key for distributed logging.
ACE_TCHAR *logger_key_;
/// Program name to be used for %n format specifier.
ACE_TCHAR *program_name_;
/// If non-0 then wipeout the logfile, otherwise append to it.
/// Default value is 0.
bool wipeout_logfile_;
/// If non-0 we have a maximum number of log files we can write.
/// Default value is 0, i.e., no maximum number.
bool fixed_number_;
/// If non-0 we order the files as we rotate them. Default value
/// is 0, i.e., we do not rotate files by default.
bool order_files_;
/// This tells us in what file we last wrote. It will be increased
/// to enable multiple log files
int count_;
/// Tells us what is the maximum log file to write. We will write
/// @c max_file_number_ + 1 files (includes the current log file).
/// Default value is 1, i.e., 2 files by default.
int max_file_number_;
/// If non-zero, sampling interval (in secs) at which maximum logfile
/// size is checked, otherwise logfile size can grow indefinitely.
/// Default value is 0.
u_long interval_;
/// Maximum logfile size (in KB). Default value is
/// ACE_DEFAULT_MAX_LOGFILE_SIZE.
u_long max_size_;
/// ACE_Log_Msg instance to work with
ACE_Log_Msg *log_msg_;
};
ACE_END_VERSIONED_NAMESPACE_DECL
ACE_FACTORY_DECLARE (ACE, ACE_Logging_Strategy)
#endif /* ACE_LOGGING_STRATEGY_H */
|
