Module: Zermelo::Backend

Extended by:
ActiveSupport::Concern
Included in:
Zermelo::Backends::InfluxDB, Zermelo::Backends::Redis, Zermelo::Backends::Stub
Defined in:
lib/zermelo/backend.rb

Instance Method Summary collapse

Instance Method Details

#add(key, value) ⇒ Object

for hashes, lists, sets



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# File 'lib/zermelo/backend.rb', line 58

def add(key, value)
  change(:add, key, value)
end

#clear(key) ⇒ Object 



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# File 'lib/zermelo/backend.rb', line 70

def clear(key)
  change(:clear, key)
end

#delete(key, value) ⇒ Object 



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# File 'lib/zermelo/backend.rb', line 62

def delete(key, value)
  change(:delete, key, value)
end

#escape_key_name(name) ⇒ Object 



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# File 'lib/zermelo/backend.rb', line 11

def escape_key_name(name)
  name.gsub(/%/, '%%').gsub(/ /, '%20').gsub(/:/, '%3A')
end

#get(attr_key) ⇒ Object 



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# File 'lib/zermelo/backend.rb', line 84

def get(attr_key)
  get_multiple(attr_key)[attr_key.klass.send(:class_key)][attr_key.id][attr_key.name.to_s]
end

#index_keys(type, value) ⇒ Object 



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# File 'lib/zermelo/backend.rb', line 30

def index_keys(type, value)
  return ["null", "null"] if value.nil?

  case type
  when :string
    ["string", escape_key_name(value)]
  when :integer
    ["integer", escape_key_name(value.to_s)]
  when :float
    ["float", escape_key_name(value.to_s)]
  when :timestamp
    case value
    when Integer
      ["timestamp", escape_key_name(value.to_s)]
    when Time, DateTime
      ["timestamp", escape_key_name(value.to_f.to_s)]
    end
  when :boolean
    case value
    when TrueClass
      ["boolean", "true"]
    when FalseClass
      ["boolean", "false"]
    end
  end
end

#lock(*klasses, &block) ⇒ Object 



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# File 'lib/zermelo/backend.rb', line 88

def lock(*klasses, &block)
  ret = nil
  # doesn't handle re-entrant case for influxdb, which has no locking yet
  locking = Thread.current[:zermelo_locking]
  if locking.nil?
    lock_proc = proc do
      begin
        Thread.current[:zermelo_locking] = klasses
        ret = block.call
      ensure
        Thread.current[:zermelo_locking] = nil
      end
    end

    lock_klass = case self
    when Zermelo::Backends::Redis
      Zermelo::Locks::RedisLock
    else
      Zermelo::Locks::NoLock
    end

    lock_klass.new.lock(*klasses, &lock_proc)
  else
    # accepts any subset of 'locking'
    unless (klasses - locking).empty?
      raise "Currently locking #{locking.map(&:name)}, cannot lock different set #{klasses.map(&:name)}"
    end
    ret = block.call
  end
  ret
end

#move(key_from, value_from, key_to, value_to) ⇒ Object 



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# File 'lib/zermelo/backend.rb', line 66

def move(key_from, value_from, key_to, value_to)
  change(:move, key_from, value_from, key_to, value_to)
end

#purge(key) ⇒ Object 



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# File 'lib/zermelo/backend.rb', line 80

def purge(key)
  change(:purge, key)
end

#safe_value(type, value) ⇒ Object 



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# File 'lib/zermelo/backend.rb', line 19

def safe_value(type, value)
  case type
  when :string, :integer
    value.to_s
  when :float, :timestamp
    value.to_f
  when :boolean
    (!!value).to_s
  end
end

#set(key, value) ⇒ Object

works for both simple and complex types (i.e. strings, numbers, booleans,

hashes, lists, sets)



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# File 'lib/zermelo/backend.rb', line 76

def set(key, value)
  change(:set, key, value)
end

#unescape_key_name(name) ⇒ Object 



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# File 'lib/zermelo/backend.rb', line 15

def unescape_key_name(name)
  name.gsub(/%3A/, ':').gsub(/%20/, ' ').gsub(/%%/, '%')
end