class Process::Daemon::Notification

This is a one shot cross-process notification mechanism using pipes. It can also be used in the same process if required, e.g. the self-pipe trick.

Public Class Methods

new() click to toggle source
# File lib/process/daemon/notification.rb, line 25
def initialize
        @output, @input = IO.pipe
        
        @signalled = false
end

Public Instance Methods

signal() click to toggle source

Signal the notification.

# File lib/process/daemon/notification.rb, line 32
def signal
        @signalled = true
        
        @input.puts
end
signalled?() click to toggle source

Was this notification signalled?

# File lib/process/daemon/notification.rb, line 39
def signalled?
        @signalled
end
wait(timeout: nil) click to toggle source

Wait/block until a signal is received. Optional timeout. @param timeout [Integer] the time to wait in seconds.

# File lib/process/daemon/notification.rb, line 45
def wait(timeout: nil)
        if timeout
                read_ready, _, _ = IO.select([@output], [], [], timeout)
                
                return false unless read_ready and read_ready.any?
        end
        
        @signalled or @output.read(1)
        
        # Just in case that this was split across multiple processes.
        @signalled = true
end