Class: Moneta::Adapters::TokyoTyrant

Inherits:
Object
  • Object
show all
Includes:
Defaults, HashAdapter
Defined in:
lib/moneta/adapters/tokyotyrant.rb

Overview

TokyoTyrant backend

Constant Summary collapse

ENOREC =

error code: no record found

7

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from HashAdapter

#clear, #fetch_values, #key?, #merge!

Methods included from Defaults

#[], #[]=, #decrement, #each_key, #features, #fetch, #fetch_values, included, #key?, #merge!, #supports?, #update

Methods included from OptionSupport

#expires, #prefix, #raw, #with

Constructor Details

#initialize(options = {}) ⇒ TokyoTyrant

Returns a new instance of TokyoTyrant

Parameters:

  • options (Hash) (defaults to: {})

Options Hash (options):

  • :host (String) — default: '127.0.0.1'

    Server host name

  • :port (Integer) — default: 1978

    Server port

  • :backend (::TokyoTyrant::RDB)

    Use existing backend instance



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# File 'lib/moneta/adapters/tokyotyrant.rb', line 27

def initialize(options = {})
  options[:host] ||= '127.0.0.1'
  options[:port] ||= 1978
  if options[:backend]
    @backend = options[:backend]
  elsif defined?(::TokyoTyrant::RDB)
    # Use ruby client
    @backend = ::TokyoTyrant::RDB.new
    @backend.open(options[:host], options[:port]) or error
  else
    # Use native client
    @backend = ::TokyoTyrant::DB.new(options[:host], options[:port])
  end
  @native = @backend.class.name != 'TokyoTyrant::RDB'
  probe = '__tokyotyrant_endianness_probe'
  @backend.delete(probe)
  @backend.addint(probe, 1)
  @pack = @backend.delete(probe) == [1].pack('l>') ? 'l>' : 'l<'
end

Instance Attribute Details

#backendObject (readonly)



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# File 'lib/moneta/adapters/tokyotyrant.rb', line 21

def backend
  @backend
end

Instance Method Details

#closeObject

Explicitly close the store

Returns:

  • nil



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# File 'lib/moneta/adapters/tokyotyrant.rb', line 90

def close
  @backend.close
  nil
end

#create(key, value, options = {}) ⇒ Boolean

Note:

Not every Moneta store implements this method, a NotImplementedError is raised if it is not supported.

Atomically sets a key to value if it's not set.

Parameters:

  • key (Object)
  • value (Object)
  • options (Hash) (defaults to: {})

Options Hash (options):

  • :expires (Integer)

    Update expiration time (See Expires)

  • :raw (Boolean)

    Raw access without value transformation (See Transformer)

  • :prefix (String)

    Prefix key (See Transformer)

Returns:

  • (Boolean)

    key was set



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# File 'lib/moneta/adapters/tokyotyrant.rb', line 76

def create(key, value, options = {})
  if @native
    begin
      # Native client throws an exception
      @backend.putkeep(key, pack(value))
    rescue TokyoTyrantError
      false
    end
  else
    @backend.putkeep(key, pack(value))
  end
end

#delete(key, options = {}) ⇒ Object

Delete the key from the store and return the current value

Parameters:

  • key (Object)
  • options (Hash) (defaults to: {})

Options Hash (options):

  • :raw (Boolean)

    Raw access without value transformation (See Transformer)

  • :prefix (String)

    Prefix key (See Transformer)

  • Other (Object)

    options as defined by the adapters or middleware

Returns:

  • (Object)

    current value



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# File 'lib/moneta/adapters/tokyotyrant.rb', line 62

def delete(key, options = {})
  value = load(key, options)
  if value
    @backend.delete(key) or error
    value
  end
end

#increment(key, amount = 1, options = {}) ⇒ Object

Note:

Not every Moneta store implements this method, a NotImplementedError is raised if it is not supported.

Atomically increment integer value with key

This method also accepts negative amounts.

Parameters:

  • key (Object)
  • amount (Integer) (defaults to: 1)
  • options (Hash) (defaults to: {})

Options Hash (options):

  • :prefix (String)

    Prefix key (See Transformer)

  • Other (Object)

    options as defined by the adapters or middleware

Returns:

  • (Object)

    value from store



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# File 'lib/moneta/adapters/tokyotyrant.rb', line 71

def increment(key, amount = 1, options = {})
  @backend.addint(key, amount) or error
end

#load(key, options = {}) ⇒ Object

Fetch value with key. Return nil if the key doesn't exist

Parameters:

  • key (Object)
  • options (Hash) (defaults to: {})

Options Hash (options):

  • :expires (Integer)

    Update expiration time (See Expires)

  • :raw (Boolean)

    Raw access without value transformation (See Transformer)

  • :prefix (String)

    Prefix key (See Transformer)

  • :sync (Boolean)

    Synchronized load (Cache reloads from adapter, Daybreak syncs with file)

  • Other (Object)

    options as defined by the adapters or middleware

Returns:

  • (Object)

    value



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# File 'lib/moneta/adapters/tokyotyrant.rb', line 48

def load(key, options = {})
  value = @backend[key]
  # raise if there is an error and the error is not "no record"
  error if value.nil? && @backend.ecode != ENOREC
  value && unpack(value)
end

#slice(*keys, **options) ⇒ <(Object, Object)>

Note:

The keys in the return value may be the same objects that were supplied (i.e. Object#equal?), or may simply be equal (i.e. Object#==).

Note:

Some adapters may implement this method atomically. The default implmentation uses #values_at.

Returns a collection of key-value pairs corresponding to those supplied keys which are present in the key-value store, and their associated values. Only those keys present in the store will have pairs in the return value. The return value can be any enumerable object that yields pairs, so it could be a hash, but needn't be.

Parameters:

  • keys (<Object>)

    The keys for the values to fetch

  • options (Hash)

Options Hash (**options):

  • :expires (Integer)

    Update expiration time (See Expires)

  • :raw (Boolean)

    Raw access without value transformation (See Transformer)

  • :prefix (String)

    Prefix key (See Transformer)

  • :sync (Boolean)

    Synchronized load (Cache reloads from adapter, Daybreak syncs with file)

  • Other (Object)

    options as defined by the adapters or middleware

Returns:

  • (<(Object, Object)>)

    A collection of key-value pairs



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# File 'lib/moneta/adapters/tokyotyrant.rb', line 96

def slice(*keys, **options)
  hash =
    if @native
      @backend.mget(*keys)
    else
      hash = Hash[keys.map { |key| [key] }]
      raise unless @backend.mget(hash) >= 0
      hash
    end

  hash.each do |key, value|
    hash[key] = unpack(value)
  end
end

#store(key, value, options = {}) ⇒ Object

Store value with key

Parameters:

  • key (Object)
  • value (Object)
  • options (Hash) (defaults to: {})

Options Hash (options):

  • :expires (Integer)

    Set expiration time (See Expires)

  • :raw (Boolean)

    Raw access without value transformation (See Transformer)

  • :prefix (String)

    Prefix key (See Transformer)

  • Other (Object)

    options as defined by the adapters or middleware

Returns:

  • value



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# File 'lib/moneta/adapters/tokyotyrant.rb', line 56

def store(key, value, options = {})
  @backend.put(key, pack(value)) or error
  value
end

#values_at(*keys, **options) ⇒ Array<Object, nil>

Note:

Some adapters may implement this method atomically, but the default implementation simply makes repeated calls to #load.

Returns an array containing the values associated with the given keys, in the same order as the supplied keys. If a key is not present in the key-value-store, nil is returned in its place.

Parameters:

  • keys (<Object>)

    The keys for the values to fetch

  • options (Hash)

Options Hash (**options):

  • :expires (Integer)

    Update expiration time (See Expires)

  • :raw (Boolean)

    Raw access without value transformation (See Transformer)

  • :prefix (String)

    Prefix key (See Transformer)

  • :sync (Boolean)

    Synchronized load (Cache reloads from adapter, Daybreak syncs with file)

  • Other (Object)

    options as defined by the adapters or middleware

Returns:

  • (Array<Object, nil>)

    Array containing the values requested, with nil for missing values



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# File 'lib/moneta/adapters/tokyotyrant.rb', line 112

def values_at(*keys, **options)
  hash = slice(*keys, **options)
  keys.map { |key| hash[key] }
end