Class: Logging::Appenders::IO

Inherits:
Logging::Appender show all
Includes:
Buffering
Defined in:
lib/logging/appenders/io.rb

Overview

This class provides an Appender that can write to any IO stream configured for writing.

Direct Known Subclasses

File, RollingFile, Stderr, Stdout, StringIo

Constant Summary

Constants included from Buffering

Buffering::DEFAULT_BUFFER_SIZE

Instance Attribute Summary collapse

Attributes included from Buffering

#auto_flushing, #buffer, #flush_period

Attributes inherited from Logging::Appender

#layout, #level, #name

Instance Method Summary collapse

Methods included from Buffering

#flush, #immediate_at=, #reopen

Methods inherited from Logging::Appender

#<<, #append, #closed?, #flush, #inspect, #reopen

Constructor Details

#initialize(name, io, opts = {}) ⇒ IO

call-seq:

IO.new( name, io )
IO.new( name, io, :layout => layout )

Creates a new IO Appender using the given name that will use the io stream as the logging destination.



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# File 'lib/logging/appenders/io.rb', line 30

def initialize( name, io, opts = {} )
  unless io.respond_to? :syswrite
    raise TypeError, "expecting an IO object but got '#{io.class.name}'"
  end

  @io = io
  @io.sync = true if io.respond_to? :sync=    # syswrite complains if the IO stream is buffered
  @io.flush rescue nil                        # syswrite also complains if in unbuffered mode and buffer isn't empty
  @close_method = :close

  super(name, opts)
  configure_buffering(opts)
end

Instance Attribute Details

#close_method ⇒ Object

The method that will be used to close the IO stream. Defaults to :close but can be :close_read, :close_write or nil. When nil, the IO stream will not be closed when the appender’s close method is called.



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# File 'lib/logging/appenders/io.rb', line 21

def close_method
  @close_method
end

Instance Method Details

#close(*args) ⇒ Object

call-seq:

close( footer = true )

Close the appender and writes the layout footer to the logging destination if the footer flag is set to true. Log events will no longer be written to the logging destination after the appender is closed.



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# File 'lib/logging/appenders/io.rb', line 52

def close( *args )
  return self if @io.nil?
  super

  io, @io = @io, nil
  unless [STDIN, STDERR, STDOUT].include?(io)
    io.send(@close_method) if @close_method and io.respond_to? @close_method
  end
rescue IOError
ensure
  return self
end