Module: Poros::ClassMethods

Included in:
Poros
Defined in:
lib/poros/class_methods.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#data_changed ⇒ Object

Returns the value of attribute data_changed.



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# File 'lib/poros/class_methods.rb', line 3

def data_changed
  @data_changed
end

#in_transaction ⇒ Object

Returns the value of attribute in_transaction.



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# File 'lib/poros/class_methods.rb', line 3

def in_transaction
  @in_transaction
end

Instance Method Details

#all ⇒ Object 



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# File 'lib/poros/class_methods.rb', line 51

def all
  Dir.glob(File.join(data_directory, '*.yml')).map { |file|
    next if file == index_file
    data = YAML.load(File.read(file))
    find(data[:uuid])
  }.compact
end

#data_directory ⇒ Object 



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# File 'lib/poros/class_methods.rb', line 39

def data_directory
  "./db/#{self}/"
end

#file_name(uuid) ⇒ Object 



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# File 'lib/poros/class_methods.rb', line 43

def file_name(uuid)
  "#{uuid}.yml"
end

#file_path(uuid) ⇒ Object 



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# File 'lib/poros/class_methods.rb', line 34

def file_path(uuid)
  FileUtils.mkdir_p(data_directory) unless File.exist?(data_directory)
  File.join(data_directory, file_name(uuid))
end

#find(uuid) ⇒ Object 



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# File 'lib/poros/class_methods.rb', line 25

def find(uuid)
  attrs = YAML.load(File.read(file_path(uuid)))
  attrs.delete(:uuid)

  object = new(attrs)
  object.uuid = uuid
  object
end

#index_data ⇒ Object 



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# File 'lib/poros/class_methods.rb', line 110

def index_data
  return @index_data if @index_data

  data = File.exist?(index_file) ? YAML.load(File.read(index_file)) : {}
  # Make sure we always have every index as a key
  poro_indexes.each do |index|
    data[index] = {} unless data.has_key?(index)
  end

  @index_data = data
end

#index_file ⇒ Object 



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# File 'lib/poros/class_methods.rb', line 47

def index_file
  File.join(data_directory, "indexes.yml")
end

#poro_attr(*attrs) ⇒ Object 



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# File 'lib/poros/class_methods.rb', line 5

def poro_attr(*attrs)
  @poro_attrs = [:uuid] | attrs
  attrs.each { |column|
    class_eval "attr_accessor :#{column}"
  }
end

#poro_attrs ⇒ Object 



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# File 'lib/poros/class_methods.rb', line 12

def poro_attrs
  @poro_attrs ||= []
end

#poro_index(*attrs) ⇒ Object 



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# File 'lib/poros/class_methods.rb', line 16

def poro_index(*attrs)
  @poro_indexes ||= []
  @poro_indexes += attrs
end

#poro_indexes ⇒ Object 



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# File 'lib/poros/class_methods.rb', line 21

def poro_indexes
  @poro_indexes ||= []
end

#rebuild_indexes ⇒ Object 



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# File 'lib/poros/class_methods.rb', line 154

def rebuild_indexes
  transaction do
    @data_changed = true
    @index_data = {}
    File.delete(index_file) if File.exist?(index_file)
    all.each { |object| update_index(object) }
  end
end

#remove_from_index(object, perist = true) ⇒ Object 



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# File 'lib/poros/class_methods.rb', line 141

def remove_from_index(object, perist = true)
  index_data

  poro_indexes.each do |index|
    @index_data[index] = {} unless @index_data.has_key?(index)
    @index_data[index].keys.each do |value|
      @index_data[index][value] ||= []
      @index_data[index][value] -= [object.uuid]
    end
  end
  write_index_data if !@in_transaction && perist
end

#transaction(&block) ⇒ Object 



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# File 'lib/poros/class_methods.rb', line 163

def transaction(&block)
  @in_transaction = true
  @data_changed = false
  block.call
  @in_transaction = false
  write_index_data if @data_changed
end

#update_index(object) ⇒ Object 



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# File 'lib/poros/class_methods.rb', line 126

def update_index(object)
  remove_from_index(object, false)

  index_data

  poro_indexes.each do |index|
    @index_data[index] = {} unless @index_data.has_key?(index)
    value = object.send(index)
    @index_data[index][value] ||= []
    @index_data[index][value] = @index_data[index][value] | [object.uuid]
  end

  write_index_data unless @in_transaction
end

#where(query) ⇒ Object 



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# File 'lib/poros/class_methods.rb', line 59

def where(query)
  indexed, table_scan = query.partition { |index, key| poro_indexes.include?(index) }

  indexed_results = indexed.map { |key, value|
    case value
    when Regexp
      index_data[key].keys.flat_map { |value_name|
        index_data[key][value_name] if value =~ value_name
      }.compact
    when Array
      value.flat_map { |value_name| index_data[key][value_name] }
    when Proc
      index_data[key].keys.flat_map { |value_name|
        index_data[key][value_name] if value.call(value_name)
      }.compact
    else
      index_data[key].has_key?(value) ?
        index_data[key][value] : []
    end
  }.inject(:&)

  if table_scan.size > 0
    scanned_results = Dir.glob(File.join(data_directory, '*.yml')).map { |file|
      next if file == index_file
      data = YAML.load(File.read(file))
      data[:uuid] if table_scan.all? { |key, value|
        case value
        when Regexp
          value =~ data[key]
        when Array
          value.include?(data[key])
        when Proc
          value.call(data[key])
        else
          data[key] == value
        end
      }
    }.compact
  end

  if indexed.size > 0 && table_scan.size > 0
    results = indexed_results & scanned_results
  elsif indexed.size > 0
    results = indexed_results
  else
    results = scanned_results
  end

  results.map { |uuid| find(uuid) }
end

#write_index_data ⇒ Object 



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# File 'lib/poros/class_methods.rb', line 122

def write_index_data
  File.write(index_file, @index_data.to_yaml)
end