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module Celluloid
# Celluloid::Future objects allow methods and blocks to run in the
# background, their values requested later
class Future
def self.new(*args, &block)
return super unless block
future = new
# task = Thread.current[:celluloid_task]
# actor = Thread.current[:celluloid_actor]
Internals::ThreadHandle.new(Celluloid.actor_system, :future) do
begin
# Thread.current[:celluloid_task] = task
# Thread.current[:celluloid_actor] = actor
call = Call::Sync.new(future, :call, args)
call.dispatch(block)
rescue
# Exceptions in blocks will get raised when the value is retrieved
end
end
future
end
attr_reader :address
def initialize(&block)
@address = Celluloid.uuid
@mutex = Mutex.new
@ready = false
@result = nil
@forwards = nil
@cancelled = false
if block
@call = Call::Sync.new(self, :call, args)
Celluloid.internal_pool.get do
begin
@call.dispatch(block)
rescue
# Exceptions in blocks will get raised when the value is retrieved
end
end
else
@call = nil
end
end
# Execute the given method in future context
def execute(receiver, method, args, block)
@mutex.synchronize do
raise "already calling" if @call
@call = Call::Sync.new(self, method, args, block)
end
receiver << @call
end
# Check if this future has a value yet
def ready?
@ready
end
# Obtain the value for this Future
def value(timeout = nil)
ready = result = nil
begin
@mutex.lock
if @ready
ready = true
result = @result
else
case @forwards
when Array
@forwards << Celluloid.mailbox
when NilClass
@forwards = Celluloid.mailbox
else
@forwards = [@forwards, Celluloid.mailbox]
end
end
ensure
@mutex.unlock
end
unless ready
result = Celluloid.receive(timeout) do |msg|
msg.is_a?(Future::Result) && msg.future == self
end
end
if result
result.respond_to?(:value) ? result.value : result
else
raise TimedOut, "Timed out"
end
end
alias call value
# Signal this future with the given result value
def signal(value)
return if @cancelled
result = Result.new(value, self)
@mutex.synchronize do
raise "the future has already happened!" if @ready
if @forwards
@forwards.is_a?(Array) ? @forwards.each { |f| f << result } : @forwards << result
end
@result = result
@ready = true
end
end
alias << signal
def cancel(error)
response = Internals::Response::Error.new(@call, error)
signal response
@mutex.synchronize do
@cancelled = true
end
end
# Inspect this Celluloid::Future
alias inspect to_s
# Wrapper for result values to distinguish them in mailboxes
class Result
attr_reader :future
def initialize(result, future)
@result = result
@future = future
end
def value
@result.value
end
end
end
end
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