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if !defined?(JRUBY_VERSION)
raise "Bunny::Concurrent::LinkedContinuationQueue can only be used on JRuby!"
end
require "java"
java_import java.util.concurrent.LinkedBlockingQueue
java_import java.util.concurrent.TimeUnit
module Bunny
module Concurrent
# Continuation queue implementation for JRuby.
#
# On JRuby, we'd rather use reliable and heavily battle tested j.u.c.
# primitives with well described semantics than informally specified, clumsy
# and limited Ruby standard library parts.
#
# This is an implementation of the continuation queue on top of the linked blocking
# queue in j.u.c.
#
# Compared to the Ruby standard library Queue, there is one limitation: you cannot
# push a nil on the queue, it will fail with a null pointer exception.
# @private
class LinkedContinuationQueue
def initialize(*args, &block)
@q = LinkedBlockingQueue.new
end
def push(el, timeout_in_ms = nil)
if timeout_in_ms
@q.offer(el, timeout_in_ms, TimeUnit::MILLISECONDS)
else
@q.offer(el)
end
end
alias << push
def pop
@q.take
end
def poll(timeout_in_ms = nil)
if timeout_in_ms
v = @q.poll(timeout_in_ms, TimeUnit::MILLISECONDS)
raise ::Timeout::Error.new("operation did not finish in #{timeout_in_ms} ms") if v.nil?
v
else
@q.poll
end
end
def clear
@q.clear
end
def method_missing(selector, *args, &block)
@q.__send__(selector, *args, &block)
end
end
end
end
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