Class: Hakuban::Stream::StreamEnumerator

Inherits:
Object
  • Object
show all
Defined in:
lib/hakuban/stream.rb

Overview

TODO: meh

Instance Method Summary collapse

Constructor Details

#initialize(stream, without_implicit_drop, async, kill_on_next, args, kwargs) ⇒ StreamEnumerator

Returns a new instance of StreamEnumerator.



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# File 'lib/hakuban/stream.rb', line 15

def initialize(stream, without_implicit_drop, async, kill_on_next, args, kwargs)
	@stream, @without_implicit_drop, @async, @kill_on_next, @args, @kwargs = stream, without_implicit_drop, async, kill_on_next, args, kwargs
end

Instance Method Details

#async(*args, **kwargs, &block) ⇒ Object 



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# File 'lib/hakuban/stream.rb', line 19

def async(*args,**kwargs,&block)
	StreamEnumerator.new(@stream, @without_implicit_drop, :async, @kill_on_next, @args+args, @kwargs.merge(kwargs)).call_or_return(&block)
end

#call_or_return(&block) ⇒ Object 



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# File 'lib/hakuban/stream.rb', line 35

def call_or_return(&block)
	if block
		Thread.handle_interrupt(Object => :never) {
			begin
				to_kill = nil
				Thread.handle_interrupt(Object => :immediate) {
					while new_item = @stream.next
						case @async
						when false
							sync_call(new_item, block)
						when :async
							if @kill_on_next
								if to_kill
									to_kill.stop
									to_kill.wait
								end
							end
							to_kill = Async(new_item) { |_task, item|
								sync_call(item, block)
							}						
						when :thread
							if @kill_on_next
								if to_kill
									to_kill.raise KilledOnNext.new
									to_kill.value 
								end
							end
							to_kill = Thread.new(new_item) { |item|
								sync_call(item, block)
							}						
						end
					end

					case @async
					when false
					when :async
						if @kill_on_next
							if to_kill
								to_kill.stop
								to_kill.wait
							end
						end
					when :thread
						if @kill_on_next
							if to_kill
								to_kill.raise KilledOnNext.new
								to_kill.value 
							end
						end
					end
				}
			ensure
				#TODO: should we kill still-running sub-tasks here, or await? or maybe kill on exception, and await otherwise?
			end
		}
	else
		self
	end
end

#kill_on_next(*args, **kwargs, &block) ⇒ Object 



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# File 'lib/hakuban/stream.rb', line 31

def kill_on_next(*args,**kwargs,&block)
	StreamEnumerator.new(@stream, @without_implicit_drop, @async, true, @args+args, @kwargs.merge(kwargs)).call_or_return(&block)
end

#thread(*args, **kwargs, &block) ⇒ Object 



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# File 'lib/hakuban/stream.rb', line 23

def thread(*args,**kwargs,&block)
	StreamEnumerator.new(@stream, @without_implicit_drop, :thread, @kill_on_next, @args+args, @kwargs.merge(kwargs)).call_or_return(&block)
end

#without_implicit_drop(*args, **kwargs, &block) ⇒ Object 



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# File 'lib/hakuban/stream.rb', line 27

def without_implicit_drop(*args,**kwargs,&block)
	StreamEnumerator.new(@stream, true, @async, @kill_on_next, @args+args, @kwargs.merge(kwargs)).call_or_return(&block)
end