Class: DriveInfo

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

Constant Summary collapse

@@drive_cache = 
nil
@@drive_cache_mutex = 
Mutex.new
@@drive_changed_notifies = 
[]
@@updating_mutex =

theoretically 2 threads could call this at once…so synchronize it…

Mutex.new

Class Method Summary collapse

Class Method Details

.add_notify_on_changed_disks(&block) ⇒ Object 



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# File 'lib/simple_gui_creator/drive_info.rb', line 86

def self.add_notify_on_changed_disks &block
 raise unless block
 @@drive_changed_notifies << block
 should_call = false
 @@drive_cache_mutex.synchronize { should_call = true if @@drive_cache }
 block.call if should_call # should be called at least once, right, on init?
 true
end

.create_looping_drive_cacher ⇒ Object 



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# File 'lib/simple_gui_creator/drive_info.rb', line 41

def self.create_looping_drive_cacher
  # has to be in its own thread or wmi will choke...
  looped_at_least_once = false
  if @caching_thread
    looped_at_least_once = true
  else
    @caching_thread = Thread.new {
      # use a dir glob to avoid having to use wmi too frequently (or accessing disks too often, which we might still be doing accidentally anyway)
      if OS.doze?
  		  old_drive_glob = '{' + DriveInfo.get_dvd_drives_even_if_no_disc_present.map{|dr| dr.MountPoint[0..0]}.join(',') + '}:/.' # must be in the thread for wmi
      else
        old_drive_glob = '/Volumes/*'
      end
      previously_known_about_discs = nil
      loop {
	      should_update = false
        @@drive_cache_mutex.synchronize { # in case the first update takes too long, basically, so they miss it LODO still a tiny race condition in here...might be useless...
          looped_at_least_once = true # let the spawning waiting thread exit quickly
          cur_disks = Dir[old_drive_glob]
  		    if cur_disks != previously_known_about_discs
	          p 'updating disk lists...'
			      should_update = true
            @@drive_cache = get_all_drives_as_ostructs_internal
            previously_known_about_discs = cur_disks
		      end
        }
        notify_all_drive_blocks_that_change_has_occured if should_update
        sleep 0.5
      }
    }
  end
  # maintain some thread startup sanity :P
  while(!looped_at_least_once)
    sleep 0.01
  end
  true
end

.get_all_drives_as_ostructs ⇒ Object

gets all drives not just DVD drives…



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# File 'lib/simple_gui_creator/drive_info.rb', line 107

def self.get_all_drives_as_ostructs # gets all drives not just DVD drives...
 @@drive_cache_mutex.synchronize {
   if @caching_thread
     @@drive_cache
   else
     get_all_drives_as_ostructs_internal # first time through for the startup thread goes here too
   end
 }
end

.get_drive_with_most_space_with_slash ⇒ Object 



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# File 'lib/simple_gui_creator/drive_info.rb', line 101

def self.get_drive_with_most_space_with_slash
 disks = get_all_drives_as_ostructs
 most_space = disks.sort_by{|d| d.FreeSpace}[-1]
 most_space.MountPoint + "/"
end

.get_dvd_drives_as_openstruct ⇒ Object 



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# File 'lib/simple_gui_creator/drive_info.rb', line 95

def self.get_dvd_drives_as_openstruct
  disks = get_all_drives_as_ostructs
  disks.select{|d| d.Description =~ /CD-ROM/ && File.exist?(d.Name + "/VIDEO_TS")}
end

.md5sum_disk(dir) ⇒ Object 



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# File 'lib/simple_gui_creator/drive_info.rb', line 25

def self.md5sum_disk(dir)
 if OS.mac?
   exe = "#{__DIR__}/../../vendor/mac_dvdid/bin/dvdid"
 else
   exe = "#{__DIR__}/../../vendor/dvdid.exe"
 end
 raise exe + '--exe doesnt exist?' unless File.exist? exe
 command = "#{exe} \"#{dir}\""
 output = `#{command}` # can take like 2.2s to spin up the disk...
 raise 'dvdid command failed?' + command unless $?.exitstatus == 0
 output.strip
end

.notify_all_drive_blocks_that_change_has_occured ⇒ Object 



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# File 'lib/simple_gui_creator/drive_info.rb', line 80

def self.notify_all_drive_blocks_that_change_has_occured
  @@updating_mutex.synchronize {
    @@drive_changed_notifies.each{|block| block.call}
  }
end