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 39
39:     def initialize(log, level = DEBUG)
40:       @level         = level
41:       @buffer        = {}
42:       @auto_flushing = 1
43:       @guard = Mutex.new
44: 
45:       if log.respond_to?(:write)
46:         @log = log
47:       elsif File.exist?(log)
48:         @log = open(log, (File::WRONLY | File::APPEND))
49:         @log.sync = true
50:       else
51:         FileUtils.mkdir_p(File.dirname(log))
52:         @log = open(log, (File::WRONLY | File::APPEND | File::CREAT))
53:         @log.sync = true
54:         @log.write("# Logfile created on %s" % [Time.now.to_s])
55:       end
56:     end
Public Instance methods
add(severity, message = nil, progname = nil, &block)

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    # File activesupport/lib/active_support/buffered_logger.rb, line 58
58:     def add(severity, message = nil, progname = nil, &block)
59:       return if @level > severity
60:       message = (message || (block && block.call) || progname).to_s
61:       # If a newline is necessary then create a new message ending with a newline.
62:       # Ensures that the original message is not mutated.
63:       message = "#{message}\n" unless message[-1] == ?\n
64:       buffer << message
65:       auto_flush
66:       message
67:     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 86
86:     def auto_flushing=(period)
87:       @auto_flushing =
88:         case period
89:         when true;                1
90:         when false, nil, 0;       MAX_BUFFER_SIZE
91:         when Integer;             period
92:         else raise ArgumentError, "Unrecognized auto_flushing period: #{period.inspect}"
93:         end
94:     end
close()

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     # File activesupport/lib/active_support/buffered_logger.rb, line 109
109:     def close
110:       flush
111:       @log.close if @log.respond_to?(:close)
112:       @log = nil
113:     end
flush()

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     # File activesupport/lib/active_support/buffered_logger.rb, line 96
 96:     def flush
 97:       @guard.synchronize do
 98:         unless buffer.empty?
 99:           old_buffer = buffer
100:           @log.write(old_buffer.join)
101:         end
102: 
103:         # Important to do this even if buffer was empty or else @buffer will
104:         # accumulate empty arrays for each request where nothing was logged.
105:         clear_buffer
106:       end
107:     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 23
23:     def silence(temporary_level = ERROR)
24:       if silencer
25:         begin
26:           old_logger_level, self.level = level, temporary_level
27:           yield self
28:         ensure
29:           self.level = old_logger_level
30:         end
31:       else
32:         yield self
33:       end
34:     end
Protected Instance methods
auto_flush()

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     # File activesupport/lib/active_support/buffered_logger.rb, line 116
116:       def auto_flush
117:         flush if buffer.size >= @auto_flushing
118:       end
buffer()

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     # File activesupport/lib/active_support/buffered_logger.rb, line 120
120:       def buffer
121:         @buffer[Thread.current] ||= []
122:       end
clear_buffer()

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     # File activesupport/lib/active_support/buffered_logger.rb, line 124
124:       def clear_buffer
125:         @buffer.delete(Thread.current)
126:       end