62 lines
1.8 KiB
Ruby
62 lines
1.8 KiB
Ruby
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#--
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#
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# Author:: Francis Cianfrocca (gmail: blackhedd)
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# Homepage:: http://rubyeventmachine.com
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# Date:: 16 Jul 2006
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#
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# See EventMachine and EventMachine::Connection for documentation and
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# usage examples.
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#
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#----------------------------------------------------------------------------
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#
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# Copyright (C) 2006-07 by Francis Cianfrocca. All Rights Reserved.
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# Gmail: blackhedd
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of either: 1) the GNU General Public License
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# as published by the Free Software Foundation; either version 2 of the
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# License, or (at your option) any later version; or 2) Ruby's License.
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#
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# See the file COPYING for complete licensing information.
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#
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#---------------------------------------------------------------------------
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#
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#
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#--
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# This defines EventMachine::Deferrable#future, which requires
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# that the rest of EventMachine::Deferrable has already been seen.
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# (It's in deferrable.rb.)
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module EventMachine
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module Deferrable
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# A future is a sugaring of a typical deferrable usage.
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#--
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# Evaluate arg (which may be an expression or a block).
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# What's the class of arg?
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# If arg is an ordinary expression, then return it.
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# If arg is deferrable (responds to :set_deferred_status),
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# then look at the arguments. If either callback or errback
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# are defined, then use them. If neither are defined, then
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# use the supplied block (if any) as the callback.
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# Then return arg.
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def self.future arg, cb=nil, eb=nil, &blk
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arg = arg.call if arg.respond_to?(:call)
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if arg.respond_to?(:set_deferred_status)
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if cb || eb
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arg.callback(&cb) if cb
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arg.errback(&eb) if eb
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else
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arg.callback(&blk) if blk
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end
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end
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arg
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end
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end
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end
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