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Moneta::Adapters::Cassandra

Cassandra backend @api public @author Potapov Sergey (aka Blake)

Attributes

backend[R]

Public Class Methods

new(options = {}) click to toggle source

@param [Hash] options @option options [String] :keyspace ('moneta') Cassandra keyspace @option options [String] :column_family ('moneta') Cassandra column family @option options [String] :host ('127.0.0.1') Server host name @option options [Integer] :port (9160) Server port @option options [Integer] :expires Default expiration time @option options [::Cassandra] :backend Use existing backend instance

# File lib/moneta/adapters/cassandra.rb, line 21
def initialize(options = {})
  self.default_expires = options[:expires]
  @cf = (options[:column_family] || 'moneta').to_sym
  if options[:backend]
    @backend = options[:backend]
  else
    keyspace = options[:keyspace] || 'moneta'
    @backend = ::Cassandra.new('system', "#{options[:host] || '127.0.0.1'}:#{options[:port] || 9160}")
    unless @backend.keyspaces.include?(keyspace)
      cf_def = ::Cassandra::ColumnFamily.new(:keyspace => keyspace, :name => @cf.to_s)
      ks_def = ::Cassandra::Keyspace.new(:name => keyspace,
                                         :strategy_class => 'SimpleStrategy',
                                         :strategy_options => { 'replication_factor' => '1' },
                                         :replication_factor => 1,
                                         :cf_defs => [cf_def])
      # Wait for keyspace to be created (issue #24)
      10.times do
        begin
          @backend.add_keyspace(ks_def)
        rescue Exception => ex
          warn "Moneta::Adapters::Cassandra - #{ex.message}"
        end
        break if @backend.keyspaces.include?(keyspace)
        sleep 0.1
      end
    end
    @backend.keyspace = keyspace
  end
end

Public Instance Methods

clear(options = {}) click to toggle source

(see Proxy#clear)

# File lib/moneta/adapters/cassandra.rb, line 89
def clear(options = {})
  @backend.each_key(@cf) do |key|
    delete(key)
  end
  self
end
close() click to toggle source

(see Proxy#close)

# File lib/moneta/adapters/cassandra.rb, line 97
def close
  @backend.disconnect!
  nil
end
delete(key, options = {}) click to toggle source

(see Proxy#delete)

# File lib/moneta/adapters/cassandra.rb, line 81
def delete(key, options = {})
  if value = load(key, options)
    @backend.remove(@cf, key)
    value
  end
end
key?(key, options = {}) click to toggle source

(see Proxy#key?)

# File lib/moneta/adapters/cassandra.rb, line 52
def key?(key, options = {})
  if @backend.exists?(@cf, key)
    load(key, options) if options.include?(:expires)
    true
  else
    false
  end
end
load(key, options = {}) click to toggle source

(see Proxy#load)

# File lib/moneta/adapters/cassandra.rb, line 62
def load(key, options = {})
  if value = @backend.get(@cf, key)
    expires = expires_value(options, nil)
    @backend.insert(@cf, key, {'value' => value['value'] }, :ttl => expires || nil) if expires != nil
    value['value']
  end
end
store(key, value, options = {}) click to toggle source

(see Proxy#store)

# File lib/moneta/adapters/cassandra.rb, line 71
def store(key, value, options = {})
  @backend.insert(@cf, key, {'value' => value}, :ttl => expires_value(options) || nil)
  value
rescue
  # FIXME: We get spurious cassandra transport exceptions
  tries ||= 0
  (tries += 1) < 10 ? retry : raise
end

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