Class: Backrub::Store::Redis

Inherits:
Base
  • Object
show all
Defined in:
lib/backrub/store/redis.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(config = {}, backlog_size = 100) ⇒ Redis

Returns a new instance of Redis.



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# File 'lib/backrub/store/redis.rb', line 8

def initialize(config={}, backlog_size=100)
  @config = config
  @backlog_size = backlog_size
end

Instance Attribute Details

#backlog_size ⇒ Object (readonly)

Returns the value of attribute backlog_size.



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# File 'lib/backrub/store/redis.rb', line 6

def backlog_size
  @backlog_size
end

#config ⇒ Object (readonly)

Returns the value of attribute config.



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# File 'lib/backrub/store/redis.rb', line 6

def config
  @config
end

Instance Method Details

#backlog(channel, count) ⇒ Object 



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# File 'lib/backrub/store/redis.rb', line 17

def backlog(channel, count)
  backlog = redis.lrange(channel, 0, count - 1)

  backlog.reverse_each do |message|
    yield channel, message
  end
end

#publish(channel, message) ⇒ Object 



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# File 'lib/backrub/store/redis.rb', line 25

def publish(channel, message)
  redis.multi do
    redis.publish(channel, message)
    redis.lpush(channel, message)
    redis.ltrim(channel, 0, backlog_size - 1)
  end
end

#redis ⇒ Object 



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# File 'lib/backrub/store/redis.rb', line 13

def redis
  @redis ||= ::Redis.new(config)
end

#subscribe(*channels) ⇒ Object 



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# File 'lib/backrub/store/redis.rb', line 33

def subscribe(*channels)
  # Open a new connection because the connection blocks, causing other threads to be unable to use it
  local_redis = ::Redis.new(config)
  local_redis.subscribe(*channels) do |on|
    on.message do |channel, message|
      yield channel, message
    end
  end
ensure
  local_redis.quit
end