Class: SocketLock

Inherits:
Object
  • Object
show all
Defined in:
lib/socketlock.rb

Constant Summary collapse

SOCKETLOCK_ROOT = 
File.dirname(File.expand_path(File.dirname(__FILE__)))
VERSION = 
'0.5.9'

Instance Method Summary collapse

Constructor Details

#initialize(port, interface = '127.0.0.1', lock_timeout = 15 * 60) ⇒ SocketLock

Returns a new instance of SocketLock.



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# File 'lib/socketlock.rb', line 11

def initialize port, interface = '127.0.0.1', lock_timeout = 15 * 60
	@port = port
	@interface = interface
	@locked = false
	@unlock_code = 'unlock'
	@lock_timeout = lock_timeout
	@monitor = Monitor.new
	@unlock_thread = nil
end

Instance Method Details

#lock ⇒ Object 



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# File 'lib/socketlock.rb', line 21

def lock
	@monitor.synchronize do
		return if locked? # we already have it
		Timeout::timeout(@lock_timeout) do
			while true
				begin
					@server = TCPServer.new(@interface, @port)
					@locked = true
					break
				rescue => e
					# Whoops... still not ours
					sleep(1.0)
				end
			end
		end # Timeout::timeout(@lock_timeout)
		# Watch for unlock requests
		@unlock_thread = Thread.new do
			while true
				begin
					socket = @server.accept()
					@monitor.synchronize do
						code = socket.gets.strip
						begin socket.close(); rescue; end
						if code == @unlock_code
							@locked = false
							@unlock_thread = nil
							@server.close()
							break
						end
					end
				rescue => e
					# Getting conn probs. We're just ignoring it.
					sleep(0.5)
				end
			end
		end # @unlock_thread
	end # @monitor.synchronize
end

#locked? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/socketlock.rb', line 71

def locked?
	@monitor.synchronize {return @locked}
end

#unlock ⇒ Object

def lock



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# File 'lib/socketlock.rb', line 60

def unlock
	@monitor.synchronize do
		if locked?
			socket = TCPSocket.new(@interface, @port)
			socket.puts @unlock_code
			socket.close()
			sleep(0.5) # Give it a chance
		end
	end
end