Class: RHACK::Storage

Inherits:
Object show all
Includes:
Redis::Objects
Defined in:
lib/rhack/storage.rb

Defined Under Namespace

Classes: TypeError

Instance Method Summary collapse

Constructor Details

#initialize(type, namespace) ⇒ Storage

Returns a new instance of Storage.



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# File 'lib/rhack/storage.rb', line 9

def initialize(type, namespace)
  @namespace = namespace
  @type = type
end

Instance Method Details

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

TODO: @ opts should apply to redis.command, e.g. “use zadd instead of sadd”



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# File 'lib/rhack/storage.rb', line 27

def __store(key, data, opts={})
  item_key = "#{@namespace}:#{key}"
  case @type
  when :hash
    redis.hmset item_key, *data.to_a
  when :set
    redis.sadd item_key, data.to_a
  when :zset
    redis.zadd item_key, data.to_a
  end
  data
end

#all ⇒ Object 



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# File 'lib/rhack/storage.rb', line 85

def all
  redis.smembers(@namespace).map_hash {|key|
    [key, redis.fetch(key)]
  }
end

#del(key) ⇒ Object 



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# File 'lib/rhack/storage.rb', line 91

def del(key)
  if redis.srem(@namespace, key)
    redis.del "#{@namespace}:#{key}"
  end
end

#exists?(key) ⇒ Boolean Also known as: ex

Returns:

  • (Boolean) 


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# File 'lib/rhack/storage.rb', line 80

def exists?(key)
  redis.type("#{@namespace}:#{key}") != 'none'
end

#fetch(key) ⇒ Object Also known as: [] 



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# File 'lib/rhack/storage.rb', line 54

def fetch(key)
  item_key = "#{@namespace}:#{key}"
  case @type
  when :hash
    redis.hgetall item_key
  when :set
    redis.smembers item_key
  when :zset
    # it will become better if I'll find use case for it
    redis.zrange item_key, 0, -1
  end
end

#fetchex(key, overwrite = nil) ⇒ Object 



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# File 'lib/rhack/storage.rb', line 68

def fetchex(key, overwrite=nil)
  exists = overwrite.nil? ? exists?(key) : !overwrite
  if exists
    fetch(key)
  else
    if res = yield
      store key, res
      res
    end
  end
end

#inspect ⇒ Object Also known as: to_s 



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# File 'lib/rhack/storage.rb', line 14

def inspect
  "<#Storage #{@namespace}: #{@type}>"
end

#keys ⇒ Object

set пригодится как для массового переноса или обновления всего неймспейса (реже), так и для &-проверки на стороне руби, какие ключи нужных данных вообще стоит дёргать (чаще)



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# File 'lib/rhack/storage.rb', line 21

def keys
  Set redis.smembers(@namespace)
end

#store(key, data) ⇒ Object Also known as: []= 



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# File 'lib/rhack/storage.rb', line 40

def store(key, data)
  redis.sadd(@namespace, key)
  __store(key, data)
end

#storenx(key, data) ⇒ Object 



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# File 'lib/rhack/storage.rb', line 46

def storenx(key, data)
  if redis.sadd(@namespace, key)
    __store(key, data)
    true
  else false
  end
end

#wipe! ⇒ Object 



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# File 'lib/rhack/storage.rb', line 97

def wipe!
  redis.smembers(@namespace).each {|key|
    redis.del "#{@namespace}:#{key}"
  }
  redis.del @namespace
end