socketry/async-container

View on GitHub
lib/async/container/forked.rb

Summary

Maintainability
A
2 hrs
Test Coverage
# Copyright, 2017, by Samuel G. D. Williams. <http://www.codeotaku.com>
# 
# 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.

require 'async/reactor'

require_relative 'group'
require_relative 'generic'
require_relative 'statistics'

module Async
    # Manages a reactor within one or more threads.
    module Container
        class Forked < Generic
            UNNAMED = "Unnamed"
            
            class Instance
                def name= value
                    ::Process.setproctitle(value)
                end
                
                def exec(*arguments)
                    ::Process.exec(*arguments)
                end
            end
            
            def self.run(*args, &block)
                self.new.run(*args, &block)
            end
            
            def self.multiprocess?
                true
            end
            
            def initialize
                super
                
                @group = Group.new
            end
            
            def spawn(name: nil, restart: false)
                Fiber.new do
                    while true
                        @statistics.spawn!
                        exit_status = @group.fork do
                            ::Process.setproctitle(name) if name
                            
                            yield Instance.new
                        end
                        
                        if exit_status.success?
                            Async.logger.info(self) {"#{name || UNNAMED} #{exit_status}"}
                        else
                            @statistics.failure!
                            Async.logger.error(self) {exit_status}
                        end
                        
                        if restart
                            @statistics.restart!
                        else
                            break
                        end
                    end
                end.resume
                
                return self
            end
            
            def sleep(duration)
                @group.sleep(duration)
            end
            
            def wait
                @group.wait
            end
            
            # Gracefully shut down all children processes.
            def stop(graceful = true)
                @group.stop(graceful)
            end
        end
    end
end