Inspired by the buffered logger idea by Ezra

Methods
Included Modules
Classes and Modules
Module ActiveSupport::BufferedLogger::Severity
Constants
MAX_BUFFER_SIZE = 1000
Attributes
[R] auto_flushing
[RW] level
Public Class methods
new(log, level = DEBUG)

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    # File activesupport/lib/active_support/buffered_logger.rb, line 41
41:     def initialize(log, level = DEBUG)
42:       @level         = level
43:       @buffer        = {}
44:       @auto_flushing = 1
45:       @guard = Mutex.new
46: 
47:       if log.respond_to?(:write)
48:         @log = log
49:       elsif File.exist?(log)
50:         @log = open(log, (File::WRONLY | File::APPEND))
51:         @log.sync = true
52:       else
53:         FileUtils.mkdir_p(File.dirname(log))
54:         @log = open(log, (File::WRONLY | File::APPEND | File::CREAT))
55:         @log.sync = true
56:         @log.write("# Logfile created on %s" % [Time.now.to_s])
57:       end
58:     end
Public Instance methods
add(severity, message = nil, progname = nil, &block)

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    # File activesupport/lib/active_support/buffered_logger.rb, line 60
60:     def add(severity, message = nil, progname = nil, &block)
61:       return if @level > severity
62:       message = (message || (block && block.call) || progname).to_s
63:       # If a newline is necessary then create a new message ending with a newline.
64:       # Ensures that the original message is not mutated.
65:       message = "#{message}\n" unless message[-1] == ?\n
66:       buffer << message
67:       auto_flush
68:       message
69:     end
auto_flushing=(period)

Set the auto-flush period. Set to true to flush after every log message, to an integer to flush every N messages, or to false, nil, or zero to never auto-flush. If you turn auto-flushing off, be sure to regularly flush the log yourself — it will eat up memory until you do.

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    # File activesupport/lib/active_support/buffered_logger.rb, line 88
88:     def auto_flushing=(period)
89:       @auto_flushing =
90:         case period
91:         when true;                1
92:         when false, nil, 0;       MAX_BUFFER_SIZE
93:         when Integer;             period
94:         else raise ArgumentError, "Unrecognized auto_flushing period: #{period.inspect}"
95:         end
96:     end
close()

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     # File activesupport/lib/active_support/buffered_logger.rb, line 111
111:     def close
112:       flush
113:       @log.close if @log.respond_to?(:close)
114:       @log = nil
115:     end
flush()

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     # File activesupport/lib/active_support/buffered_logger.rb, line 98
 98:     def flush
 99:       @guard.synchronize do
100:         unless buffer.empty?
101:           old_buffer = buffer
102:           @log.write(old_buffer.join)
103:         end
104: 
105:         # Important to do this even if buffer was empty or else @buffer will
106:         # accumulate empty arrays for each request where nothing was logged.
107:         clear_buffer
108:       end
109:     end
silence(temporary_level = ERROR) {|self| ...}

Silences the logger for the duration of the block.

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    # File activesupport/lib/active_support/buffered_logger.rb, line 25
25:     def silence(temporary_level = ERROR)
26:       if silencer
27:         begin
28:           old_logger_level, self.level = level, temporary_level
29:           yield self
30:         ensure
31:           self.level = old_logger_level
32:         end
33:       else
34:         yield self
35:       end
36:     end
Protected Instance methods
auto_flush()

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     # File activesupport/lib/active_support/buffered_logger.rb, line 118
118:       def auto_flush
119:         flush if buffer.size >= @auto_flushing
120:       end
buffer()

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     # File activesupport/lib/active_support/buffered_logger.rb, line 122
122:       def buffer
123:         @buffer[Thread.current] ||= []
124:       end
clear_buffer()

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     # File activesupport/lib/active_support/buffered_logger.rb, line 126
126:       def clear_buffer
127:         @buffer.delete(Thread.current)
128:       end