Class: Listen::Adapter::Polling

Inherits:
Base
  • Object
show all
Defined in:
lib/listen/adapter/polling.rb

Overview

Polling Adapter that works cross-platform and has no dependencies. This is the adapter that uses the most CPU processing power and has higher file IO than the other implementations.

Constant Summary collapse

DEFAULT_POLLING_LATENCY = 
1.0

Constants inherited from Base

Base::DEFAULT_LATENCY

Instance Attribute Summary

Attributes inherited from Base

#listener

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Base

#_directories_path, #_notify_change, #initialize

Constructor Details

This class inherits a constructor from Listen::Adapter::Base

Class Method Details

.usable? ⇒ Boolean

Returns:

  • (Boolean) 


12
13
14
 
# File 'lib/listen/adapter/polling.rb', line 12

def self.usable?
  true
end

Instance Method Details

#_latency ⇒ Object (private) 



22
23
24
 
# File 'lib/listen/adapter/polling.rb', line 22

def _latency
  listener.options[:latency] || DEFAULT_POLLING_LATENCY
end

#_nap_time ⇒ Object (private) 



40
41
42
43
44
45
 
# File 'lib/listen/adapter/polling.rb', line 40

def _nap_time
  start = Time.now.to_f
  yield
  nap_time = _latency - (Time.now.to_f - start)
  sleep(nap_time) if nap_time > 0
end

#_napped_loop ⇒ Object (private) 



34
35
36
37
38
 
# File 'lib/listen/adapter/polling.rb', line 34

def _napped_loop
  loop do
    _nap_time { yield }
  end
end

#_poll_directories ⇒ Object (private) 



26
27
28
29
30
31
32
 
# File 'lib/listen/adapter/polling.rb', line 26

def _poll_directories
  _napped_loop do
    listener.directories.each do |path|
      _notify_change(path, type: 'Dir', recursive: true)
    end
  end
end

#start ⇒ Object 



16
17
18
 
# File 'lib/listen/adapter/polling.rb', line 16

def start
  Thread.new { _poll_directories }
end