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# Copyright (c) 2008 Zetetic LLC
# Permission is hereby granted, free of charge, to any person
# obtaining a copy of this software and associated documentation
# files (the "Software"), to deal in the Software without
# restriction, including without limitation the rights to use,
# copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the
# Software is furnished to do so, subject to the following
# conditions:
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
# OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
# HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
# WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
# OTHER DEALINGS IN THE SOFTWARE.
module Looper
def trap_signals
sigtrap = proc {
puts "caught trapped signal, shutting down"
@run = false
}
signals = ["SIGTERM", "SIGINT"]
signals.push("SIGHUP") unless is_windows?
signals.each do |signal|
trap signal, sigtrap
end
end
def is_windows?
processor, platform, *rest = RUBY_PLATFORM.split("-")
platform =~ /mswin/ || platform =~ /mingw/
end
def loopme(run_every = 10)
# we don't want to delay output to sdtout until the program stops, we want feedback!
$stdout.sync=true
trap_signals
@run = true
puts "#{Time.now} process started with #{run_every} loop. kill #{Process.pid} to stop"
last_run = Time.now - run_every - 1
while (@run) do
now = Time.now
if last_run + run_every < now
begin
yield
rescue Exception => e
puts "Uncaught exception bubbled up: \n#{e.class}: #{e.message}\n\t#{e.backtrace.join("\n\t")} "
end
last_run = now
end
sleep(2)
end
puts "#{Time.now} shutting down"
end
def write_pid(filename, pid)
file = File.new(filename, "w")
file.print pid.to_s
file.close
end
def exit_loop
@run = false
end
end
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