Module: OkHbase::Concerns::Table

Extended by:
ActiveSupport::Concern
Included in:
ClassMethods::ClassMethods, Table
Defined in:
lib/ok_hbase/concerns/table.rb,
lib/ok_hbase/concerns/table/batch.rb,
lib/ok_hbase/concerns/table/class_methods.rb,
lib/ok_hbase/concerns/table/instrumentation.rb

Defined Under Namespace

Modules: ClassMethods, Instrumentation Classes: Batch

Constant Summary collapse

SCANNER_DEFAULTS = 
{
    start_row: nil,
    stop_row: nil,
    row_prefix: nil,
    columns: nil,
    filter_string: nil,
    timestamp: nil,
    include_timestamp: false,
    caching: 1000,
    limit: nil,
}.freeze

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#connection ⇒ Object

Returns the value of attribute connection.



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# File 'lib/ok_hbase/concerns/table.rb', line 20

def connection
  @connection
end

#table_name ⇒ Object

Returns the value of attribute table_name.



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# File 'lib/ok_hbase/concerns/table.rb', line 20

def table_name
  @table_name
end

Class Method Details

.connection ⇒ Object 



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# File 'lib/ok_hbase/concerns/table.rb', line 30

def self.connection
  @self.connection
end

.connection=(val) ⇒ Object 



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# File 'lib/ok_hbase/concerns/table.rb', line 34

def self.connection=(val)
  @self.connection = val
end

Instance Method Details

#_column_family_names ⇒ Object 



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# File 'lib/ok_hbase/concerns/table.rb', line 209

def _column_family_names()
  self.connection.client.getColumnDescriptors(self.connection.table_name(table_name)).keys()
end

#_make_row(cell_map, include_timestamp) ⇒ Object 



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# File 'lib/ok_hbase/concerns/table.rb', line 232

def _make_row(cell_map, include_timestamp)
  row = {}
  cell_map.each_pair do |cell_name, cell|
    row[cell_name] = include_timestamp ? [cell.value, cell.timestamp] : cell.value
  end
  row
end

#_scanner(opts) ⇒ Object 



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# File 'lib/ok_hbase/concerns/table.rb', line 213

def _scanner(opts)
  scanner = Apache::Hadoop::Hbase::Thrift::TScan.new()
  scanner_fields = Apache::Hadoop::Hbase::Thrift::TScan::FIELDS

  opts.each_pair do |k, v|
    const = k.to_s.upcase.gsub('_', '')
    const_value = Apache::Hadoop::Hbase::Thrift::TScan.const_get(const) rescue nil

    if const_value
      v.force_encoding(Encoding::UTF_8) if v.is_a?(String)
      OkHbase.logger.info "setting scanner.#{scanner_fields[const_value][:name]}: #{v}"
      scanner.send("#{scanner_fields[const_value][:name]}=", v)
    else
    end
  end
  scanner

end

#batch(timestamp = nil, batch_size = nil, transaction = false) ⇒ Object 



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# File 'lib/ok_hbase/concerns/table.rb', line 185

def batch(timestamp = nil, batch_size = nil, transaction = false)
  Batch.new(self, timestamp, batch_size, transaction)
end

#cells(row_key, column, versions = nil, timestamp = nil, include_timestamp = nil) ⇒ Object 



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# File 'lib/ok_hbase/concerns/table.rb', line 92

def cells(row_key, column, versions = nil, timestamp = nil, include_timestamp = nil)

  row_key.force_encoding(Encoding::UTF_8)

  versions ||= (2 ** 31) -1

  raise TypeError.new "'versions' parameter must be a number or nil" unless versions.is_a? Integer
  raise ArgumentError.new "'versions' parameter must be >= 1" unless versions >= 1

  cells = if timestamp
    raise TypeError.new "'timestamp' must be an integer" unless timestamp.is_a? Integer

    self.connection.client.getVerTs(self.connection.table_name(table_name), row_key, column, timestamp, versions)
  else
    self.connection.client.getVer(self.connection.table_name(table_name), row_key, column, versions)
  end

  cells.map { |cell| include_timestamp ? [cell.value, cell.timestamp] : cell.value }
end

#counter_dec(row_key, column, value = 1) ⇒ Object 



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# File 'lib/ok_hbase/concerns/table.rb', line 203

def counter_dec(row_key, column, value = 1)
  counter_inc(row_key, column, -value)
end

#counter_get(row_key, column) ⇒ Object 



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# File 'lib/ok_hbase/concerns/table.rb', line 189

def counter_get(row_key, column)
  counter_inc(row_key, column, 0)
end

#counter_inc(row_key, column, value = 1) ⇒ Object 



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# File 'lib/ok_hbase/concerns/table.rb', line 199

def counter_inc(row_key, column, value = 1)
  self.connection.client.atomicIncrement(self.connection.table_name(table_name), row_key, column, value)
end

#counter_set(row_key, column, value = 0) ⇒ Object 



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# File 'lib/ok_hbase/concerns/table.rb', line 193

def counter_set(row_key, column, value = 0)
  self.batch.transaction do |batch|
    batch.put(row_key, { column => [value].pack('Q>') })
  end
end

#delete(row_key, columns = nil, timestamp = nil) ⇒ Object 



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# File 'lib/ok_hbase/concerns/table.rb', line 173

def delete(row_key, columns = nil, timestamp = nil)
  if columns
    batch = self.batch(timestamp)
    batch.transaction do |batch|
      batch.delete(row_key, columns)
    end

  else
    timestamp ? self.connection.client.deleteAllRowTs(self.connection.table_name(table_name), row_key, timestamp) : self.connection.client.deleteAllRow(self.connection.table_name(table_name), row_key)
  end
end

#families ⇒ Object 



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# File 'lib/ok_hbase/concerns/table.rb', line 39

def families()
  descriptors = self.connection.client.getColumnDescriptors(self.connection.table_name(table_name))

  families = {}

  descriptors.each_pair do |name, descriptor|
    name = name[0...-1] # remove trailing ':'
    families[name] = OkHbase.thrift_type_to_dict(descriptor)
  end
  families
end

#put(row_key, data, timestamp = nil) ⇒ Object 



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# File 'lib/ok_hbase/concerns/table.rb', line 165

def put(row_key, data, timestamp = nil)
  batch = self.batch(timestamp)

  batch.transaction do |batch|
    batch.put(row_key, data)
  end
end

#regions ⇒ Object 



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# File 'lib/ok_hbase/concerns/table.rb', line 51

def regions
  regions = self.connection.client.getTableRegions(self.connection.table_name(table_name))
  regions.map { |r| OkHbase.thrift_type_to_dict(r) }
end

#row(row_key, columns = nil, timestamp = nil, include_timestamp = false) ⇒ Object 



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# File 'lib/ok_hbase/concerns/table.rb', line 56

def row(row_key, columns = nil, timestamp = nil, include_timestamp = false)
  raise TypeError.new "'columns' must be a tuple or list" if columns && !columns.is_a?(Array)

  row_key.force_encoding(Encoding::UTF_8)

  rows = if timestamp
    raise TypeError.new "'timestamp' must be an integer" unless timestamp.is_a? Integer

    self.connection.client.getRowWithColumnsTs(self.connection.table_name(table_name), row_key, columns, timestamp)
  else
    self.connection.client.getRowWithColumns(self.connection.table_name(table_name), row_key, columns)
  end

  rows.empty? ? {} : _make_row(rows[0].columns, include_timestamp)
end

#rows(row_keys, columns = nil, timestamp = nil, include_timestamp = false) ⇒ Object 



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# File 'lib/ok_hbase/concerns/table.rb', line 72

def rows(row_keys, columns = nil, timestamp = nil, include_timestamp = false)
  raise TypeError.new "'columns' must be a tuple or list" if columns && !columns.is_a?(Array)

  row_keys.map! { |r| r.force_encoding(Encoding::UTF_8) }

  return {} if row_keys.blank?

  rows = if timestamp
    raise TypeError.new "'timestamp' must be an integer" unless timestamp.is_a? Integer

    columns = _column_family_names() unless columns

    self.connection.client.getRowsWithColumnsTs(self.connection.table_name(table_name), row_keys, columns, timestamp)
  else
    self.connection.client.getRowsWithColumns(self.connection.table_name(table_name), row_keys, columns)
  end

  rows.map { |row| _make_row(row.columns, include_timestamp) }
end

#scan(opts = {}) ⇒ Object Also known as: find 



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# File 'lib/ok_hbase/concerns/table.rb', line 112

def scan(opts={})

  rows = [] unless block_given?
  opts = SCANNER_DEFAULTS.merge opts.select { |k| SCANNER_DEFAULTS.keys.include? k }


  raise ArgumentError.new "'caching' must be >= 1" unless opts[:caching] && opts[:caching] >= 1
  raise ArgumentError.new "'limit' must be >= 1" if opts[:limit] && opts[:limit] < 1

  if opts[:row_prefix]
    raise ArgumentError.new "'row_prefix' cannot be combined with 'start_row' or 'stop_row'" if opts[:start_row] || opts[:stop_row]

    opts[:start_row] = opts[:row_prefix]
    opts[:stop_row] = OkHbase::increment_string opts[:start_row]

  end
  opts[:start_row] ||= ''

  scanner = _scanner(opts)

  scanner_id = self.connection.client.scannerOpenWithScan(self.connection.table_name(table_name), scanner)

  fetched_count = returned_count = 0

  begin
    while true
      how_many = opts[:limit] ? [opts[:caching], opts[:limit] - returned_count].min : opts[:caching]

      items = if how_many == 1
        self.connection.client.scannerGet(scanner_id)
      else
        self.connection.client.scannerGetList(scanner_id, how_many)
      end

      fetched_count += items.length

      items.map.with_index do |item, index|
        if block_given?
          yield item.row, _make_row(item.columns, opts[:include_timestamp])
        else
          rows << [item.row, _make_row(item.columns, opts[:include_timestamp])]
        end
        return rows if opts[:limit] && index + 1 + returned_count == opts[:limit]
      end

      break if items.length < how_many
    end
  ensure
    self.connection.client.scannerClose(scanner_id)
  end
  rows
end