class Moneta::Adapters::HBase

HBase thrift backend @api public

Public Class Methods

new(options = {}) click to toggle source

@param [Hash] options @option options [String] :host (‘127.0.0.1’) Server host name @option options [Integer] :port (9090) Server port @option options [String] :table (‘moneta’) Table name @option options [String] :column_family (‘moneta’) Column family @option options [String] :column (‘value’) Column @option options [::HBaseRb::Client] :backend Use existing backend instance

Calls superclass method Moneta::Adapter::new
# File lib/moneta/adapters/hbase.rb, line 26
def initialize(options = {})
  super
  @column = [config.column_family, config.column].join(':')
  backend.create_table(config.table, config.column_family) unless backend.has_table?(config.table)
  @table = backend.get_table(config.table)
end

Public Instance Methods

clear(options = {}) click to toggle source

(see Proxy#clear)

# File lib/moneta/adapters/hbase.rb, line 67
def clear(options = {})
  @table.create_scanner do |row|
    @table.delete_row(row.row)
  end
  self
end
close() click to toggle source

(see Proxy#close)

# File lib/moneta/adapters/hbase.rb, line 75
def close
  backend.close
  nil
end
delete(key, options = {}) click to toggle source

(see Proxy#delete)

# File lib/moneta/adapters/hbase.rb, line 59
def delete(key, options = {})
  if value = load(key, options)
    @table.delete_row(key)
    value
  end
end
increment(key, amount = 1, options = {}) click to toggle source

(see Proxy#increment)

# File lib/moneta/adapters/hbase.rb, line 51
def increment(key, amount = 1, options = {})
  result = @table.atomic_increment(key, @column, amount)
  # HACK: Throw error if applied to invalid value
  Integer(load(key)) if result == 0
  result
end
key?(key, options = {}) click to toggle source

(see Proxy#key?)

# File lib/moneta/adapters/hbase.rb, line 34
def key?(key, options = {})
  @table.get(key, @column).first != nil
end
load(key, options = {}) click to toggle source

(see Proxy#load)

# File lib/moneta/adapters/hbase.rb, line 39
def load(key, options = {})
  cell = @table.get(key, @column).first
  cell && unpack(cell.value)
end
store(key, value, options = {}) click to toggle source

(see Proxy#store)

# File lib/moneta/adapters/hbase.rb, line 45
def store(key, value, options = {})
  @table.mutate_row(key, @column => pack(value))
  value
end

Private Instance Methods

pack(value) click to toggle source
# File lib/moneta/adapters/hbase.rb, line 82
def pack(value)
  intvalue = value.to_i
  if intvalue >= 0 && intvalue <= 0xFFFFFFFFFFFFFFFF && intvalue.to_s == value
    # Pack as 8 byte big endian
    [intvalue].pack('Q>')
  elsif value.bytesize >= 8
    # Add nul character to make value distinguishable from integer
    value + "\0"
  else
    value
  end
end
unpack(value) click to toggle source
# File lib/moneta/adapters/hbase.rb, line 95
def unpack(value)
  if value.bytesize == 8
    # Unpack 8 byte big endian
    value.unpack1('Q>').to_s
  elsif value.bytesize >= 9 && value[-1] == ?\0
    # Remove nul character
    value[0..-2]
  else
    value
  end
end