Class: Alephant::Sequencer::SequenceCache

Inherits:
Object
  • Object
show all
Includes:
Logger
Defined in:
lib/alephant/sequencer/sequence_cache.rb

Constant Summary collapse

DEFAULT_TTL = 
2

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(config = {}) ⇒ SequenceCache

Returns a new instance of SequenceCache.



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# File 'lib/alephant/sequencer/sequence_cache.rb', line 13

def initialize(config={})
  @config = config

  unless config_endpoint.nil?
    @elasticache ||= ::Dalli::ElastiCache.new(config_endpoint, { :expires_in => ttl })
    @client ||= @elasticache.client
  else
    logger.debug "Alephant::SequenceCache::#initialize: No config endpoint, NullClient used"
    logger.metric "NoConfigEndpoint"
    @client = NullClient.new
  end
end

Instance Attribute Details

#config ⇒ Object (readonly)

Returns the value of attribute config.



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# File 'lib/alephant/sequencer/sequence_cache.rb', line 9

def config
  @config
end

Instance Method Details

#get(key, &block) ⇒ Object 



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# File 'lib/alephant/sequencer/sequence_cache.rb', line 26

def get(key, &block)
  begin
    versioned_key = versioned key
    result = @client.get versioned_key
    logger.info "Alephant::SequenceCache#get key: #{versioned_key} - #{result ? 'hit' : 'miss'}"
    logger.metric "GetKeyMiss" unless result
    result ? result : set(key, block.call)
  rescue StandardError => e
    block.call
  end
end

#set(key, value, ttl = nil) ⇒ Object 



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# File 'lib/alephant/sequencer/sequence_cache.rb', line 38

def set(key, value, ttl = nil)
  value.tap { |o| @client.set(versioned(key), o, ttl) }
end