/
queue.rb
84 lines (66 loc) · 1.75 KB
/
queue.rb
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require 'base64'
begin
require 'redis'
rescue LoadError
warn "To use the `PersistentQueueClasses::Redis::Queue` please ensure the `redis` Gem is installed and on the load path."
exit 1
end
module PersistentQueueClasses
module Redis
class Queue
attr_reader :options, :redis
def initialize(options={})
@options = default_options.merge(options)
end
def length
redis.llen(options[:queue_key_name]) || 0
end
alias :size :length
def empty?
length == 0
end
def num_waiting
(redis.get(options[:waiting_key_name]) || 0).to_i
end
def push(object)
redis.rpush options[:queue_key_name], Base64.encode64(Marshal.dump(object))
end
alias :enq :push
alias :<< :push
def pop
redis.incr options[:waiting_key_name]
key, object = bredis.blpop(options[:queue_key_name])
Marshal.load(Base64.decode64(object))
ensure
redis.decr options[:waiting_key_name]
clear if empty?
end
alias :deq :pop
alias :shift :pop
def clear
r = redis.multi do
redis.del options[:queue_key_name]
redis.del options[:waiting_key_name]
end
return []
end
private
def redis
@redis ||= begin
::Redis.new(options).tap do |r|
r.setnx options[:waiting_key_name], 0
end
end
end
def bredis
@bredis ||= ::Redis.new(options)
end
def default_options
{
queue_key_name: "persistent-queue-classes:redis:queue:#{self.hash.abs}:queue",
waiting_key_name: "persistent-queue-classes:redis:queue:#{self.hash.abs}:waiting",
}
end
end
end
end