Class: LockManager::RedisConnection

Inherits:
Connection show all
Defined in:
lib/lock_manager/redis_connection.rb

Instance Attribute Summary collapse

Attributes inherited from Connection

#options

Instance Method Summary collapse

Methods inherited from Connection

connection_class

Constructor Details

#initialize(options = {}) ⇒ RedisConnection

Returns a new instance of RedisConnection.

Raises:

  • (ArgumentError) 


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# File 'lib/lock_manager/redis_connection.rb', line 7

def initialize(options = {})
  super
  raise ArgumentError, ':server option is mandatory for redis connections' unless options[:server]
  @server = options[:server]
  @port = options[:port]
end

Instance Attribute Details

#port ⇒ Object (readonly)

Returns the value of attribute port.



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# File 'lib/lock_manager/redis_connection.rb', line 5

def port
  @port
end

#server ⇒ Object (readonly)

Returns the value of attribute server.



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# File 'lib/lock_manager/redis_connection.rb', line 5

def server
  @server
end

Instance Method Details

#connect_redis(redis_server, redis_port = 6379) ⇒ Object

Create a connection to redis.



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# File 'lib/lock_manager/redis_connection.rb', line 39

def connect_redis(redis_server, redis_port = 6379)
  redis = Redis.new(host: redis_server, port: redis_port)
  redis.ping
  redis
end

#handle ⇒ Object 



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# File 'lib/lock_manager/redis_connection.rb', line 34

def handle
  @handle ||= connect_redis(server, port)
end

#key_from_host(host) ⇒ Object 



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# File 'lib/lock_manager/redis_connection.rb', line 30

def key_from_host(host)
  "node_lock_#{host}"
end

#read(host) ⇒ Object 



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# File 'lib/lock_manager/redis_connection.rb', line 14

def read(host)
  handle.get key_from_host(host)
end

#remove(host) ⇒ Object 



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# File 'lib/lock_manager/redis_connection.rb', line 26

def remove(host)
  handle.del key_from_host(host)
end

#write(host, value) ⇒ Object 



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# File 'lib/lock_manager/redis_connection.rb', line 22

def write(host, value)
  handle.set(key_from_host(host), value)
end

#write_if_not_exists(host, value) ⇒ Object 



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# File 'lib/lock_manager/redis_connection.rb', line 18

def write_if_not_exists(host, value)
  handle.setnx(key_from_host(host), value)
end