Class: RxRuby::AsyncLock

Inherits:
Object
  • Object
show all
Defined in:
lib/rx_ruby/concurrency/async_lock.rb

Overview

Asynchronous lock.

Instance Method Summary collapse

Constructor Details

#initialize ⇒ AsyncLock

Returns a new instance of AsyncLock.



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# File 'lib/rx_ruby/concurrency/async_lock.rb', line 9

def initialize
  @queue = []
  @is_acquired = false
  @has_faulted = false
  @gate = Mutex.new
end

Instance Method Details

#clear ⇒ Object

Clears the work items in the queue and drops further work being queued.



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# File 'lib/rx_ruby/concurrency/async_lock.rb', line 49

def clear
  @gate.synchronize do
    @queue = []
    @has_faulted = true
  end
end

#wait(&action) ⇒ Object 



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# File 'lib/rx_ruby/concurrency/async_lock.rb', line 16

def wait(&action)
  @gate.synchronize do
    @queue.push action unless @has_faulted

    if @is_acquired or @has_faulted
      return
    else
      @is_acquired = true
    end
  end

  loop do
    work = nil

    @gate.synchronize do
      work = @queue.shift

      unless work
        @is_acquired = false
        return
      end
    end

    begin
      work.call
    rescue
      clear
      raise
    end
  end
end