Class: Tr8n::CacheAdapters::Memcache

Inherits:
Tr8n::Cache show all
Defined in:
lib/tr8n/cache_adapters/memcache.rb

Instance Method Summary collapse

Methods inherited from Tr8n::Cache

#cached_by_source?, #enabled?, #info, #reset_version, #segmented?, #update_version, #upgrade_version, #version, #versioned_key, #warn

Constructor Details

#initialize ⇒ Memcache

Returns a new instance of Memcache.



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# File 'lib/tr8n/cache_adapters/memcache.rb', line 37

def initialize
  options = { :namespace => Tr8n.config.cache[:namespace] || "tr8n", :compress => Tr8n.config.cache[:compress].nil? ? true : Tr8n.config.cache[:compress]}
  @cache = Dalli::Client.new(Tr8n.config.cache[:host], options)
end

Instance Method Details

#cache_name ⇒ Object 



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# File 'lib/tr8n/cache_adapters/memcache.rb', line 42

def cache_name
  "memcache"
end

#clear(opts = {}) ⇒ Object 



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# File 'lib/tr8n/cache_adapters/memcache.rb', line 99

def clear(opts = {})
  info("Cache clear")
rescue Exception => ex
  warn("Failed to clear cache: #{key}")
end

#delete(key, opts = {}) ⇒ Object 



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# File 'lib/tr8n/cache_adapters/memcache.rb', line 82

def delete(key, opts = {})
  info("Cache delete: #{key}")
  @cache.delete(versioned_key(key, opts))
  key
rescue Exception => ex
  warn("Failed to delete data: #{key}")
  key
end

#exist?(key, opts = {}) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/tr8n/cache_adapters/memcache.rb', line 91

def exist?(key, opts = {})
  data = @cache.get(versioned_key(key, opts))
  not data.nil?
rescue Exception => ex
  warn("Failed to check if key exists: #{key}")
  false
end

#fetch(key, opts = {}) ⇒ Object 



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# File 'lib/tr8n/cache_adapters/memcache.rb', line 50

def fetch(key, opts = {})
  data = @cache.get(versioned_key(key, opts))
  if data
    info("Cache hit: #{key}")
    return data
  end

  info("Cache miss: #{key}")

  return nil unless block_given?

  data = yield

  store(key, data)

  data
rescue Exception => ex
  warn("Failed to retrieve data: #{key}")
  return nil unless block_given?
  yield
end

#read_only? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/tr8n/cache_adapters/memcache.rb', line 46

def read_only?
  false
end

#store(key, data, opts = {}) ⇒ Object 



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# File 'lib/tr8n/cache_adapters/memcache.rb', line 72

def store(key, data, opts = {})
  info("Cache store: #{key}")
  ttl = opts[:ttl] || Tr8n.config.cache[:timeout]
  @cache.set(versioned_key(key, opts), data, ttl)
  data
rescue Exception => ex
  warn("Failed to store data: #{key}")
  data
end