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Contents
require 'ladle'
require 'java'
module Ladle
##
# Implementations of platform-specific behaviors for JRuby.
#
# This separate strategy is necessary because you can't
# `Process.waitpid2` on the PID returned by JRuby's `IO.popen4`.
class JRubyProcess
##
# Create a new process for the given command and its args.
def initialize(*command_and_args)
@command_and_args = command_and_args
end
##
# Start the process and return pipes to its standard streams.
#
# @return [[IO, IO, IO]] stdin, stdout, and stderr for the running process.
def popen
# You can't wait for the PID returned by JRuby's IO.popen4, so
# this is necessary.
cmd = @command_and_args.collect(&:to_s).to_java(:string)
@process = Java::JavaLang::ProcessBuilder.new(
cmd
).start
[
# java.util.Process flips the meanings of "in" and "out"
# relative to popen3
@process.output_stream.to_io,
@process.input_stream.to_io,
@process.error_stream.to_io
]
end
##
# Wait for the process to finish.
#
# @return [Fixnum] the return status of the process.
def wait
@process.waitFor
end
##
# Send signal 15 to the process.
#
# @return [void]
def stop_gracefully
begin
Process.kill 15, pid
rescue Errno::ESRCH
# already gone
end
end
##
# @return [Fixnum] the PID for the process
def pid
@pid ||= Java::OrgJrubyUtil::ShellLauncher.getPidFromProcess(@process)
end
end
end
Version data entries
6 entries across 6 versions & 1 rubygems