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require 'thread'
module Rack
# Rack::Reloader checks on every request, but at most every +secs+
# seconds, if a file loaded changed, and reloads it, logging to
# rack.errors.
#
# It is recommended you use ShowExceptions to catch SyntaxErrors etc.
class Reloader
def initialize(app, secs=10)
@app = app
@secs = secs # reload every @secs seconds max
@last = Time.now
end
def call(env)
if Time.now > @last + @secs
Thread.exclusive {
reload!(env['rack.errors'])
@last = Time.now
}
end
@app.call(env)
end
def reload!(stderr=STDERR)
need_reload = $LOADED_FEATURES.find_all { |loaded|
begin
if loaded =~ /\A[.\/]/ # absolute filename or 1.9
abs = loaded
else
abs = $LOAD_PATH.map { |path| ::File.join(path, loaded) }.
find { |file| ::File.exist? file }
end
if abs
::File.mtime(abs) > @last - @secs rescue false
else
false
end
end
}
need_reload.each { |l|
$LOADED_FEATURES.delete l
}
need_reload.each { |to_load|
begin
if require to_load
stderr.puts "#{self.class}: reloaded `#{to_load}'"
end
rescue LoadError, SyntaxError => e
raise e # Possibly ShowExceptions
end
}
stderr.flush
need_reload
end
end
end
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