Class: Xunch::CacheBuilder

Inherits:
Object
  • Object
show all
Defined in:
lib/xunch/cache/cache_builder.rb

Class Method Summary collapse

Class Method Details

.build(file) ⇒ Object

every cache config hava attributes below:

‘type’

> the cache type, have object|field_object|list_object

‘name’

> the cache name, used for redis key prefix

‘version’

> the cache version, maybe you change your cache object format and you will change a version of the cache

‘expire_time’

> cache expire time for every key in millisecond

‘cache_class’

> which type of object you cache, this will help us to encode/decode your object

‘key_field_name’

> define which field in the object we used for redis key

‘regex’

> a regex string which used for match consistency hash key

‘shard_infos’

> define which redis instance we used for caching



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# File 'lib/xunch/cache/cache_builder.rb', line 14

def self.build(file)
  configs = YAML.load_file(file)
  shard_info_configs = configs["shard_infos"]
  cache_configs = configs["caches"]
  shards = {}
  shard_info_configs.each_value  { |shard_info_config|
    options = {}
    shard_info_config.each { |k,v|
        options[k.to_sym] = v
    }
    shards[options[:name]] = options
  }
  caches = {}
  lazy_caches = {}
  cache_configs.each  { |cache_key, cache_config|
    puts "loading cache #{cache_key} #{cache_config}"
    if cache_config["type"] == nil
      raise ArgumentError.new("#{cache_key} cache type can't be nil.")
    end
    if cache_config["shards"] == nil
      raise ArgumentError.new("#{cache_key} cache shards can't be nil.")
    end
    shard_names = cache_config["shards"].split(",")
    if cache_config["driver"]
      driver = cache_config["driver"].downcase.to_sym
      puts "#{cache_key} use redis driver #{driver}"
    end
    shard_infos = []
    shard_size = shard_names.size
    shard_names.each { |shard|
      split = shard.split(":")
      shard_name = split[0]
      weight = split[1]
      shard_options = {}
      if driver
        shard_options[:driver] = driver
        if shard_options[:driver] == :synchrony and cache_config["type"].start_with?("list")
          raise ArgumentError.new("list cache can't use synchrony driver. cache key is #{cache_key}")
        end
      end
      if cache_config["timeout"]
        shard_options[:timeout] = cache_config["timeout"]
      end
      if cache_config["size"]
        shard_options[:size] = cache_config["size"] / shard_size
        if shard_options[:size] == 0
          shard_options[:size] = 1
        end
      end
      if weight
        shard_options[:weight] = weight.to_i
      end
      if shards[shard_name]
        shard_options.merge!(shards[shard_name])
      else
        raise ArgumentError.new("Unknown shard #{shard_name}, initialize cache #{cache_key} failed.")
      end
      shard_infos.push(ShardInfo.new(shard_options))
    }
    case cache_config["type"]
    when CacheType::OBJECT
      cache = Xunch::ObjectCache.new(cache_config,shard_infos)
      caches[cache_config["name"]] = cache
    when CacheType::FIELDOBJECT
      cache = Xunch::FieldObjectCache.new(cache_config,shard_infos)
      caches[cache_config["name"]] = cache
    when CacheType::LISTID
      cache = Xunch::ListIdCache.new(cache_config,shard_infos)
      caches[cache_config["name"]] = cache
    when CacheType::LISTOBJECT
      lazy_caches[cache_config] = shard_infos
    when CacheType::LISTFIELDOBJECT
      lazy_caches[cache_config] = shard_infos
    else
      raise XunchConfigError.new("Unknown cache type #{cache_config["type"]}.")
    end
  }
  lazy_caches.each { |cache_config,shard_infos|
    delegate = caches[cache_config["delegate"]]
    raise XunchConfigError.new("list_cache init error, delegate does not exist.") unless delegate != nil
    cache = nil
    case cache_config["type"]
    when CacheType::LISTOBJECT
      cache = Xunch::ListObjectCache.new(cache_config,shard_infos,delegate)
    when CacheType::LISTFIELDOBJECT
      cache = Xunch::ListFieldObjectCache.new(cache_config,shard_infos,delegate)
    else
      raise XunchConfigError.new("Unknown cache type #{cache_config["type"]}.")
    end

    caches[cache_config["name"]] = cache
  }
  caches
end