Class: WithLock::Server

Inherits:
Object
  • Object
show all
Extended by:
Common
Defined in:
lib/with_lock/server.rb

Class Method Summary collapse

Methods included from Common

default_settings, load_settings, local_settings_filename, logger, pid, pidfile, running?, settings, settings_filename, url

Class Method Details

.count(name) ⇒ Object 



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# File 'lib/with_lock/server.rb', line 23

def self.count(name)
  locks[name][:count]
rescue => e
  0
end

.daemon_settings ⇒ Object 



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# File 'lib/with_lock/server.rb', line 86

def self.daemon_settings
  {
     :multiple   => false,
     :ontop      => false,
     :backtrace  => true,
     :log_output => true,
     :monitor    => false,
     :dir_mode   => :normal,
     :dir        => 'tmp/pids'
   }
end

.decrement(owner, name) ⇒ Object 



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# File 'lib/with_lock/server.rb', line 67

def self.decrement(owner,name)
  if mine?(owner,name)
    locks[name][:count] -= 1
  end
  count(name)
end

.get(owner, name, timeout = 5) ⇒ Object 



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# File 'lib/with_lock/server.rb', line 37

def self.get(owner,name,timeout=5)
  endtime = Time.now.to_f + timeout.to_f
  owner_uri, owner_pid = owner.split('|')
  while !mine?(owner,name)  && (Time.now.to_f < endtime)
    mutex.synchronize do
      if !locked?(name)
        locks[name] = {owner: owner, count: 1}
      end
    end
    sleep 0.01 unless mine?(owner,name)
  end
  mine?(owner,name)
end

.increment(owner, name) ⇒ Object 



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# File 'lib/with_lock/server.rb', line 60

def self.increment(owner,name)
  if mine?(owner,name)
    locks[name][:count] += 1
  end
  count(name)
end

.locked?(name) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/with_lock/server.rb', line 29

def self.locked?(name)
  !locks[name].nil?# && owner_active?(name)
end

.locks ⇒ Object 



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# File 'lib/with_lock/server.rb', line 74

def self.locks
  @@locks ||= {}
end

.mine?(owner, name) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/with_lock/server.rb', line 33

def self.mine?(owner,name)
  locked?(name) && locks[name][:owner].eql?(owner)
end

.mutex ⇒ Object 



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# File 'lib/with_lock/server.rb', line 7

def self.mutex
  @@mutex ||= Mutex.new
end

.owner_pid(name) ⇒ Object 



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# File 'lib/with_lock/server.rb', line 17

def self.owner_pid(name)
  locks[name][:pid]
rescue => e
  ''
end

.owner_uri?(name) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/with_lock/server.rb', line 11

def self.owner_uri?(name)
  locks[name][:owner]
rescue => e
  ''
end

.release(owner, name) ⇒ Object 



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# File 'lib/with_lock/server.rb', line 51

def self.release(owner,name)
  if mine?(owner,name)
    locks.delete(name)
    true
  else
    false
  end
end

.run_service ⇒ Object 



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# File 'lib/with_lock/server.rb', line 108

def self.run_service
  return if started?
  DRb.start_service(WithLock::Server::url,WithLock::Server)
  DRb.thread.join
end

.start_service ⇒ Object 



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# File 'lib/with_lock/server.rb', line 98

def self.start_service
  return if started?
  FileUtils.rm(pidfile) if File.exists?(pidfile)
  options = daemon_settings.merge(:ARGV => ['start'])
  Daemons.run_proc('with_lock', options) do 
    DRb.start_service(WithLock::Server::url,WithLock::Server)
    DRb.thread.join
  end
end

.started? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/with_lock/server.rb', line 82

def self.started?
  pid.to_i > 0 && running?(pid)
end

.stop_service ⇒ Object 



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# File 'lib/with_lock/server.rb', line 114

def self.stop_service
  return unless started?
  `kill #{pid}`
  FileUtils.rm_f(pidfile)
end

.write_url(url) ⇒ Object 



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# File 'lib/with_lock/server.rb', line 78

def self.write_url(url)
  File.open(File.join(settings['directory'],'with_lock'),'w'){|file| file.write(url)}
end