Class: Coordinator::RedisQueue

Inherits:
Object
  • Object
show all
Defined in:
lib/coordinator/redis_queue.rb

Direct Known Subclasses

Queue

Instance Method Summary collapse

Constructor Details

#initialize(name) ⇒ RedisQueue

Returns a new instance of RedisQueue.

Raises:



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# File 'lib/coordinator/redis_queue.rb', line 5

def initialize(name)
  @queue_name = "#{name}-queue"
  @capacity_name = "#{name}-capacity"
  raise Coordinator::Error, "'Redis.current' not set" unless Redis.current
  @redis = Redis.current
end

Instance Method Details

#capacity ⇒ Object 



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# File 'lib/coordinator/redis_queue.rb', line 42

def capacity
  data = @redis.get(@capacity_name)
  deserialize(data)
end

#capacity=(capacity) ⇒ Object 



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# File 'lib/coordinator/redis_queue.rb', line 47

def capacity=(capacity)
  @redis.set(@capacity_name, capacity)
end

#full? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/coordinator/redis_queue.rb', line 55

def full?
  capacity && capacity <= length
end

#items ⇒ Object 



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# File 'lib/coordinator/redis_queue.rb', line 51

def items
  serialized_items.map { |i| deserialize(i) }
end

#left_push(item) ⇒ Object 



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# File 'lib/coordinator/redis_queue.rb', line 18

def left_push(item)
  data = serialize(item)
  @redis.lpush(@queue_name, data) unless serialized_items.include?(data)
end

#length ⇒ Object 



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# File 'lib/coordinator/redis_queue.rb', line 38

def length
  @redis.llen(@queue_name)
end

#peek ⇒ Object 



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# File 'lib/coordinator/redis_queue.rb', line 33

def peek
  data = @redis.lrange(@queue_name, 0, 0).first
  deserialize(data)
end

#pop ⇒ Object 



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# File 'lib/coordinator/redis_queue.rb', line 23

def pop
  data = @redis.lpop(@queue_name)
  deserialize(data)
end

#push(item) ⇒ Object 



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# File 'lib/coordinator/redis_queue.rb', line 12

def push(item)
  return false if full?
  data = serialize(item)
  @redis.rpush(@queue_name, data) unless serialized_items.include?(data)
end

#remove(item) ⇒ Object 



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# File 'lib/coordinator/redis_queue.rb', line 28

def remove(item)
  data = serialize(item)
  @redis.lrem(@queue_name, 1, data) == 1
end