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/* -*- C++ -*- */
//=============================================================================
/**
* @file Logging_Strategy.h
*
* $Id$
*
* @author Prashant Jain <pjain@cs.wustl.edu>
*/
//=============================================================================
#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 */
/**
* @class ACE_Logging_Strategy
*
* @brief This class provides the hooks to control the output produced
* by any of the network services.
*
* 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 <sample_interval_in_secs> and -m
* <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)).
*/
class ACE_Export ACE_Logging_Strategy : public ACE_Service_Object
{
public:
/// Constructor.
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.
'-f' Pass in the flags (such as OSTREAM, STDERR, LOGGER, VERBOSE,
SILENT, VERBOSE_LITE) used to control logging.
'-i' The interval (in seconds) at which the logfile size is sampled
(default is 0, i.e., do not sample by default).
'-k' Set the logging key.
'-m' Maximum logfile size in Kbytes.
'-n' Set the program name for the %n format specifier.
'-N' The maximum number of logfiles that we want created.
'-o' Specifies that we want the no standard logfiles ordering
(fastest processing in <handle_timeout>). Default is not to
order logfiles.
'-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).
'-s' Ensure that the OSTREAM flag is set
'-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).
'-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);
private:
/// 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.
int wipeout_logfile_;
/// This tells us in what file we last wrote. It will be increased
/// to enable multiple log files
int count_;
/// If non-0 we have a maximum number of log files we can write.
/// Default value is 0, i.e., no maximum number.
int 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.
int order_files_;
/// Tells us what is the maximum log file to write. We will write
/// <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_FACTORY_DECLARE (ACE, ACE_Logging_Strategy)
#endif /* ACE_LOGGING_STRATEGY_H */
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