Module: Zermelo::Records::ClassMethods

Extended by:
Forwardable
Includes:
Attributes
Defined in:
lib/zermelo/records/class_methods.rb

Instance Method Summary collapse

Methods included from Attributes

#attribute_types

Instance Method Details

#backend ⇒ Object 



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# File 'lib/zermelo/records/class_methods.rb', line 62

def backend
  raise "No data storage backend set for #{self.name}" if @backend.nil?
  @backend
end

#generate_id ⇒ Object 



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# File 'lib/zermelo/records/class_methods.rb', line 28

def generate_id
  return SecureRandom.uuid if SecureRandom.respond_to?(:uuid)
  # from 1.9 stdlib
  ary = SecureRandom.random_bytes(16).unpack("NnnnnN")
  ary[2] = (ary[2] & 0x0fff) | 0x4000
  ary[3] = (ary[3] & 0x3fff) | 0x8000
  "%08x-%04x-%04x-%04x-%04x%08x" % ary
end

#key_dump ⇒ Object 



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# File 'lib/zermelo/records/class_methods.rb', line 67

def key_dump
  klass_keys = [backend.key_to_backend_key(ids_key), ids_key]
  self.send(:with_index_data) do |d|
    d.keys.each do |k|
      klass_keys += self.send("#{k}_index".to_sym).key_dump
    end
  end
  Hash[ *klass_keys ]
end

#lock(*klasses, &block) ⇒ Object 



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# File 'lib/zermelo/records/class_methods.rb', line 37

def lock(*klasses, &block)
  klasses += [self] unless klasses.include?(self)
  backend.lock(*klasses, &block)
end

#transaction(&block) ⇒ Object 



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# File 'lib/zermelo/records/class_methods.rb', line 42

def transaction(&block)
  failed = false

  backend.begin_transaction

  begin
    yield
  rescue Exception # => e
    backend.abort_transaction
    # p e.message
    # puts e.backtrace.join("\n")
    failed = true
  ensure
    backend.commit_transaction unless failed
  end

  # TODO include exception info
  raise "Transaction failed" if failed
end