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# Copyright:: Copyright (c) 2014 Opscode, Inc.
# License:: Apache License, Version 2.0
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
require 'thread'
class Chef
class Util
# A simple threaded job queue
#
# Create a queue:
#
# queue = ThreadedJobQueue.new
#
# Add jobs:
#
# queue << lambda { |lock| foo.the_bar }
#
# A job is a callable that optionally takes a Mutex instance as its only
# parameter.
#
# Then start processing jobs with +n+ threads:
#
# queue.process(n)
#
class ThreadedJobQueue
def initialize
@queue = Queue.new
@lock = Mutex.new
end
def <<(job)
@queue << job
end
def process(concurrency = 10)
workers = (1..concurrency).map do
Thread.new do
loop do
fn = @queue.pop
fn.arity == 1 ? fn.call(@lock) : fn.call
end
end
end
workers.each { |worker| self << Thread.method(:exit) }
workers.each { |worker| worker.join }
end
end
end
end
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