Class: SemanticLogger::Logger

Inherits:
Base
  • Object
show all
Defined in:
lib/semantic_logger/logger.rb

Overview

Logger stores the class name to be used for all log messages so that every log message written by this instance will include the class name

Direct Known Subclasses

DebugAsTraceLogger

Constant Summary collapse

@@lag_check_interval = 
5000
@@lag_threshold_s = 
30

Instance Attribute Summary

Attributes inherited from Base

#filter, #name

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Base

#benchmark, default_level, default_level=, #fast_tag, #level, #level=, #payload, #pop_tags, #push_tags, #silence, #tagged, #tags, #with_payload

Constructor Details

#initialize(klass, level = nil, filter = nil) ⇒ Logger

Returns a Logger instance

Return the logger for a specific class, supports class specific log levels

logger = SemanticLogger::Logger.new(self)

OR

logger = SemanticLogger::Logger.new('MyClass')

Parameters:

application
  A class, module or a string with the application/class name
  to be used in the logger

level
  The initial log level to start with for this logger instance
  Default: SemanticLogger.default_level

filter [Regexp|Proc]
  RegExp: Only include log messages where the class name matches the supplied
  regular expression. All other messages will be ignored
  Proc: Only include log messages where the supplied Proc returns true
        The Proc must return true or false



27
28
29
 
# File 'lib/semantic_logger/logger.rb', line 27

def initialize(klass, level=nil, filter=nil)
  super
end

Class Method Details

.appenders ⇒ Object

DEPRECATED See SemanticLogger.add_appender



87
88
89
90
 
# File 'lib/semantic_logger/logger.rb', line 87

def self.appenders
  warn '[DEPRECATION] SemanticLogger::Logger.appenders is deprecated.  Please use SemanticLogger.add_appender instead.'
  SemanticLogger.appenders
end

.cache_count ⇒ Object

DEPRECATED: Please use queue_size instead.



93
94
95
96
 
# File 'lib/semantic_logger/logger.rb', line 93

def self.cache_count
  warn '[DEPRECATION] SemanticLogger::Logger.cache_count is deprecated.  Please use SemanticLogger::Logger.queue_size instead.'
  queue_size
end

.flush ⇒ Object

Flush all queued log entries disk, database, etc.

All queued log messages are written and then each appender is flushed in turn



44
45
46
47
48
49
50
51
 
# File 'lib/semantic_logger/logger.rb', line 44

def self.flush
  return false unless appender_thread_active?

  logger.trace "Flushing appenders with #{queue_size} log messages on the queue"
  reply_queue = Queue.new
  queue << {command: :flush, reply_queue: reply_queue}
  reply_queue.pop
end

.lag_check_interval ⇒ Object

Returns the check_interval which is the number of messages between checks to determine if the appender thread is falling behind



58
59
60
 
# File 'lib/semantic_logger/logger.rb', line 58

def self.lag_check_interval
  @@lag_check_interval
end

.lag_check_interval=(lag_check_interval) ⇒ Object

Set the check_interval which is the number of messages between checks to determine if the appender thread is falling behind



64
65
66
 
# File 'lib/semantic_logger/logger.rb', line 64

def self.lag_check_interval=(lag_check_interval)
  @@lag_check_interval = lag_check_interval
end

.lag_threshold_s ⇒ Object

Returns the amount of time in seconds to determine if the appender thread is falling behind



70
71
72
 
# File 'lib/semantic_logger/logger.rb', line 70

def self.lag_threshold_s
  @@lag_threshold_s
end

.logger=(logger) ⇒ Object

Allow the internal logger to be overridden from its default to STDERR

Can be replaced with another Ruby logger or Rails logger, but never to
SemanticLogger::Logger itself since it is for reporting problems
while trying to log to the various appenders



82
83
84
 
# File 'lib/semantic_logger/logger.rb', line 82

def self.logger=(logger)
  @@logger = logger
end

.on_metric(&block) ⇒ Object

Supply a block to be called whenever a metric is seen during benchmark logging

Parameters
  block
    The block to be called

Example:

SemanticLogger.on_metric do |log_struct|
  puts "#{log_struct.metric} was received. Log Struct: #{log_struct.inspect}"
end



108
109
110
 
# File 'lib/semantic_logger/logger.rb', line 108

def self.on_metric(&block)
  (@@metric_subscribers ||= Concurrent::Array.new) << block
end

.queue_size ⇒ Object

Returns [Integer] the number of log entries that have not been written to the appenders

When this number grows it is because the logging appender thread is not able to write to the appenders fast enough. Either reduce the amount of logging, increase the log level, reduce the number of appenders, or look into speeding up the appenders themselves



38
39
40
 
# File 'lib/semantic_logger/logger.rb', line 38

def self.queue_size
  queue.size
end

.time_threshold_s=(time_threshold_s) ⇒ Object 



74
75
76
 
# File 'lib/semantic_logger/logger.rb', line 74

def self.time_threshold_s=(time_threshold_s)
  @@lag_threshold_s = time_threshold_s
end