Class: Zoidberg::Proxy::Liberated

Inherits:
Zoidberg::Proxy show all
Defined in:
lib/zoidberg/proxy/liberated.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods inherited from Zoidberg::Proxy

#_zoidberg_handle_unexpected_error, #_zoidberg_link, #_zoidberg_link=, #_zoidberg_object, #_zoidberg_set_instance, #_zoidberg_signal, #_zoidberg_signal=, #_zoidberg_unexpected_error, inherited, register, registry, scrub!

Constructor Details

#initialize(klass, *args, &block) ⇒ self

Create a new proxy instance, new real instance, and link them



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# File 'lib/zoidberg/proxy/liberated.rb', line 16

def initialize(klass, *args, &block)
  @_build_args = [klass, args, block]
  @_lock = ::Mutex.new
  @_count_lock = ::Mutex.new
  @_accessing_threads = []
  @_locker = nil
  @_locker_count = 0
  @_zoidberg_signal = nil
  @_raw_threads = ::Smash.new{ ::Array.new }
  @_supervised = klass.ancestors.include?(::Zoidberg::Supervise)
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(*args, &block) ⇒ Object

Used to proxy request to real instance



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# File 'lib/zoidberg/proxy/liberated.rb', line 29

def method_missing(*args, &block)
  res = nil
  @_accessing_threads << ::Thread.current
  begin
    _aquire_lock!
    if(::ENV['ZOIDBERG_TESTING'])
      ::Kernel.require 'timeout'
      ::Timeout.timeout(::ENV.fetch('ZOIDBERG_TESTING_TIMEOUT', 5).to_i) do
        res = @_raw_instance.__send__(*args, &block)
      end
    else
      res = @_raw_instance.__send__(*args, &block)
    end
  rescue ::Zoidberg::Supervise::AbortException => e
    ::Kernel.raise e.original_exception
  rescue ::Exception => e
    ::Zoidberg.logger.debug "Exception on: #{_raw_instance.class.name}##{args.first}(#{args.slice(1, args.size).map(&:inspect).join(', ')})"
    _zoidberg_unexpected_error(e)
    if(e.class.to_s == 'fatal' && !@_fatal_retry)
      @_fatal_retry = true
      retry
    else
      ::Kernel.raise e
    end
  ensure
    _release_lock!
    t_idx = @_accessing_threads.index(::Thread.current)
    @_accessing_threads.delete_at(t_idx) if t_idx
  end
  res
end

Instance Attribute Details

#_locker ⇒ Thread (readonly)

Returns current owner of lock.

Returns:

  • (Thread) —

    current owner of lock



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# File 'lib/zoidberg/proxy/liberated.rb', line 9

def _locker
  @_locker
end

#_raw_threads ⇒ Hash<Integer:Thread> (readonly)

Returns:

  • (Hash<Integer:Thread>) 


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# File 'lib/zoidberg/proxy/liberated.rb', line 11

def _raw_threads
  @_raw_threads
end

Instance Method Details

#_aquire_lock! ⇒ TrueClas

Aquire the lock to access real instance. If already locked, will wait until lock can be aquired.

Returns:

  • (TrueClas) 


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# File 'lib/zoidberg/proxy/liberated.rb', line 75

def _aquire_lock!
  if(@_lock)
    if(::ENV['ZOIDBERG_DEBUG'] == 'true')
      ::Timeout.timeout(::ENV.fetch('ZOIDBERG_DEBUG_TIMEOUT', 10).to_i) do
        @_lock.lock unless @_locker == ::Thread.current
      end
    else
      @_lock.lock unless @_locker == ::Thread.current
    end
    @_locker = ::Thread.current
    @_locker_count += 1
    _zoidberg_signal(:locked)
  end
  true
end

#_release_lock! ⇒ TrueClass

Release the lock to access real instance

Returns:

  • (TrueClass) 


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# File 'lib/zoidberg/proxy/liberated.rb', line 94

def _release_lock!
  if(@_lock)
    if(@_locker == ::Thread.current)
      @_locker_count -= 1
      if(@_locker_count < 1)
        @_locker = nil
        @_lock.unlock if @_lock.locked?
      end
    end
    _zoidberg_signal(:unlocked)
  end
  true
end

#_zoidberg_available? ⇒ TrueClass, FalseClass

Returns currently unlocked.

Returns:

  • (TrueClass, FalseClass) —

    currently unlocked



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# File 'lib/zoidberg/proxy/liberated.rb', line 67

def _zoidberg_available?
  !_zoidberg_locked?
end

#_zoidberg_destroy!(error = nil) ⇒ TrueClass

Ensure any async threads are killed and accessing threads are forced into error state.

Returns:

  • (TrueClass) 


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# File 'lib/zoidberg/proxy/liberated.rb', line 112

def _zoidberg_destroy!(error=nil)
  super do
    _raw_threads[_raw_instance.object_id].map do |thread|
      thread.raise ::Zoidberg::DeadException.new('Instance in terminated state!')
    end.map do |thread|
      thread.join(2)
    end.find_all(&:alive?).map(&:kill)
    _raw_threads.delete(_raw_instance.object_id)
    @_accessing_threads.each do |thr|
      if(thr.alive?)
        begin
          thr.raise ::Zoidberg::DeadException.new('Instance in terminated state!')
        rescue
        end
      end
    end
    @_accessing_threads.clear
  end
end

#_zoidberg_locked? ⇒ TrueClass, FalseClass

Returns currently locked.

Returns:

  • (TrueClass, FalseClass) —

    currently locked



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# File 'lib/zoidberg/proxy/liberated.rb', line 62

def _zoidberg_locked?
  @_lock && @_lock.locked?
end