Updated included memcache-client to the 1.5.0.5 version which includes fixes from fiveruns and 37signals to deal with failover and timeouts (Joshua Sierles) [#1535 state:committed]

Signed-off-by: David Heinemeier Hansson <david@loudthinking.com>

1 files changed, 0 insertions, 849 deletions

diff --git a/activesupport/lib/active_support/vendor/memcache-client-1.5.1/memcache.rb b/activesupport/lib/active_support/vendor/memcache-client-1.5.1/memcache.rb
deleted file mode 100644
index 99c9af0398..0000000000
--- a/activesupport/lib/active_support/vendor/memcache-client-1.5.1/memcache.rb
+++ /dev/null
@@ -1,849 +0,0 @@
-# All original code copyright 2005, 2006, 2007 Bob Cottrell, Eric Hodel,
-# The Robot Co-op.  All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions
-# are met:
-#
-# 1. Redistributions of source code must retain the above copyright
-#    notice, this list of conditions and the following disclaimer.
-# 2. Redistributions in binary form must reproduce the above copyright
-#    notice, this list of conditions and the following disclaimer in the
-#    documentation and/or other materials provided with the distribution.
-# 3. Neither the names of the authors nor the names of their contributors
-#    may be used to endorse or promote products derived from this software
-#    without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS
-# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE
-# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
-# OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
-# OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
-# BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
-# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
-# OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
-# EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-
-require 'socket'
-require 'thread'
-require 'timeout'
-require 'rubygems'
-
-class String
-
-  ##
-  # Uses the ITU-T polynomial in the CRC32 algorithm.
-
-  def crc32_ITU_T
-    n = length
-    r = 0xFFFFFFFF
-
-    n.times do |i|
-      r ^= self[i]
-      8.times do
-        if (r & 1) != 0 then
-          r = (r>>1) ^ 0xEDB88320
-        else
-          r >>= 1
-        end
-      end
-    end
-
-    r ^ 0xFFFFFFFF
-  end
-
-end
-
-##
-# A Ruby client library for memcached.
-#
-# This is intended to provide access to basic memcached functionality.  It
-# does not attempt to be complete implementation of the entire API, but it is
-# approaching a complete implementation.
-
-class MemCache
-
-  ##
-  # The version of MemCache you are using.
-
-  VERSION = '1.5.0'
-
-  ##
-  # Default options for the cache object.
-
-  DEFAULT_OPTIONS = {
-    :namespace   => nil,
-    :readonly    => false,
-    :multithread => false,
-  }
-
-  ##
-  # Default memcached port.
-
-  DEFAULT_PORT = 11211
-
-  ##
-  # Default memcached server weight.
-
-  DEFAULT_WEIGHT = 1
-
-  ##
-  # The amount of time to wait for a response from a memcached server.  If a
-  # response is not completed within this time, the connection to the server
-  # will be closed and an error will be raised.
-
-  attr_accessor :request_timeout
-
-  ##
-  # The namespace for this instance
-
-  attr_reader :namespace
-
-  ##
-  # The multithread setting for this instance
-
-  attr_reader :multithread
-
-  ##
-  # The servers this client talks to.  Play at your own peril.
-
-  attr_reader :servers
-
-  ##
-  # Accepts a list of +servers+ and a list of +opts+.  +servers+ may be
-  # omitted.  See +servers=+ for acceptable server list arguments.
-  #
-  # Valid options for +opts+ are:
-  #
-  #   [:namespace]   Prepends this value to all keys added or retrieved.
-  #   [:readonly]    Raises an exception on cache writes when true.
-  #   [:multithread] Wraps cache access in a Mutex for thread safety.
-  #
-  # Other options are ignored.
-
-  def initialize(*args)
-    servers = []
-    opts = {}
-
-    case args.length
-    when 0 then # NOP
-    when 1 then
-      arg = args.shift
-      case arg
-      when Hash   then opts = arg
-      when Array  then servers = arg
-      when String then servers = [arg]
-      else raise ArgumentError, 'first argument must be Array, Hash or String'
-      end
-    when 2 then
-      servers, opts = args
-    else
-      raise ArgumentError, "wrong number of arguments (#{args.length} for 2)"
-    end
-
-    opts = DEFAULT_OPTIONS.merge opts
-    @namespace   = opts[:namespace]
-    @readonly    = opts[:readonly]
-    @multithread = opts[:multithread]
-    @mutex       = Mutex.new if @multithread
-    @buckets     = []
-    self.servers = servers
-  end
-
-  ##
-  # Returns a string representation of the cache object.
-
-  def inspect
-    "<MemCache: %d servers, %d buckets, ns: %p, ro: %p>" %
-      [@servers.length, @buckets.length, @namespace, @readonly]
-  end
-
-  ##
-  # Returns whether there is at least one active server for the object.
-
-  def active?
-    not @servers.empty?
-  end
-
-  ##
-  # Returns whether or not the cache object was created read only.
-
-  def readonly?
-    @readonly
-  end
-
-  ##
-  # Set the servers that the requests will be distributed between.  Entries
-  # can be either strings of the form "hostname:port" or
-  # "hostname:port:weight" or MemCache::Server objects.
-
-  def servers=(servers)
-    # Create the server objects.
-    @servers = servers.collect do |server|
-      case server
-      when String
-        host, port, weight = server.split ':', 3
-        port ||= DEFAULT_PORT
-        weight ||= DEFAULT_WEIGHT
-        Server.new self, host, port, weight
-      when Server
-        if server.memcache.multithread != @multithread then
-          raise ArgumentError, "can't mix threaded and non-threaded servers"
-        end
-        server
-      else
-        raise TypeError, "cannot convert #{server.class} into MemCache::Server"
-      end
-    end
-
-    # Create an array of server buckets for weight selection of servers.
-    @buckets = []
-    @servers.each do |server|
-      server.weight.times { @buckets.push(server) }
-    end
-  end
-
-  ##
-  # Decrements the value for +key+ by +amount+ and returns the new value.
-  # +key+ must already exist.  If +key+ is not an integer, it is assumed to be
-  # 0.  +key+ can not be decremented below 0.
-
-  def decr(key, amount = 1)
-    server, cache_key = request_setup key
-
-    if @multithread then
-      threadsafe_cache_decr server, cache_key, amount
-    else
-      cache_decr server, cache_key, amount
-    end
-  rescue TypeError, SocketError, SystemCallError, IOError => err
-    handle_error server, err
-  end
-
-  ##
-  # Retrieves +key+ from memcache.  If +raw+ is false, the value will be
-  # unmarshalled.
-
-  def get(key, raw = false)
-    server, cache_key = request_setup key
-
-    value = if @multithread then
-              threadsafe_cache_get server, cache_key
-            else
-              cache_get server, cache_key
-            end
-
-    return nil if value.nil?
-
-    value = Marshal.load value unless raw
-
-    return value
-  rescue TypeError, SocketError, SystemCallError, IOError => err
-    handle_error server, err
-  end
-
-  ##
-  # Retrieves multiple values from memcached in parallel, if possible.
-  #
-  # The memcached protocol supports the ability to retrieve multiple
-  # keys in a single request.  Pass in an array of keys to this method
-  # and it will:
-  #
-  # 1. map the key to the appropriate memcached server
-  # 2. send a single request to each server that has one or more key values
-  #
-  # Returns a hash of values.
-  #
-  #   cache["a"] = 1
-  #   cache["b"] = 2
-  #   cache.get_multi "a", "b" # => { "a" => 1, "b" => 2 }
-
-  def get_multi(*keys)
-    raise MemCacheError, 'No active servers' unless active?
-
-    keys.flatten!
-    key_count = keys.length
-    cache_keys = {}
-    server_keys = Hash.new { |h,k| h[k] = [] }
-
-    # map keys to servers
-    keys.each do |key|
-      server, cache_key = request_setup key
-      cache_keys[cache_key] = key
-      server_keys[server] << cache_key
-    end
-
-    results = {}
-
-    server_keys.each do |server, keys_for_server|
-      keys_for_server = keys_for_server.join ' '
-      values = if @multithread then
-                 threadsafe_cache_get_multi server, keys_for_server
-               else
-                 cache_get_multi server, keys_for_server
-               end
-      values.each do |key, value|
-        results[cache_keys[key]] = Marshal.load value
-      end
-    end
-
-    return results
-  rescue TypeError, SocketError, SystemCallError, IOError => err
-    handle_error server, err
-  end
-
-  ##
-  # Increments the value for +key+ by +amount+ and retruns the new value.
-  # +key+ must already exist.  If +key+ is not an integer, it is assumed to be
-  # 0.
-
-  def incr(key, amount = 1)
-    server, cache_key = request_setup key
-
-    if @multithread then
-      threadsafe_cache_incr server, cache_key, amount
-    else
-      cache_incr server, cache_key, amount
-    end
-  rescue TypeError, SocketError, SystemCallError, IOError => err
-    handle_error server, err
-  end
-
-  ##
-  # Add +key+ to the cache with value +value+ that expires in +expiry+
-  # seconds.  If +raw+ is true, +value+ will not be Marshalled.
-  #
-  # Warning: Readers should not call this method in the event of a cache miss;
-  # see MemCache#add.
-
-  def set(key, value, expiry = 0, raw = false)
-    raise MemCacheError, "Update of readonly cache" if @readonly
-    server, cache_key = request_setup key
-    socket = server.socket
-
-    value = Marshal.dump value unless raw
-    command = "set #{cache_key} 0 #{expiry} #{value.size}\r\n#{value}\r\n"
-
-    begin
-      @mutex.lock if @multithread
-      socket.write command
-      result = socket.gets
-      raise_on_error_response! result
-      result
-    rescue SocketError, SystemCallError, IOError => err
-      server.close
-      raise MemCacheError, err.message
-    ensure
-      @mutex.unlock if @multithread
-    end
-  end
-
-  ##
-  # Add +key+ to the cache with value +value+ that expires in +expiry+
-  # seconds, but only if +key+ does not already exist in the cache.
-  # If +raw+ is true, +value+ will not be Marshalled.
-  #
-  # Readers should call this method in the event of a cache miss, not
-  # MemCache#set or MemCache#[]=.
-
-  def add(key, value, expiry = 0, raw = false)
-    raise MemCacheError, "Update of readonly cache" if @readonly
-    server, cache_key = request_setup key
-    socket = server.socket
-
-    value = Marshal.dump value unless raw
-    command = "add #{cache_key} 0 #{expiry} #{value.size}\r\n#{value}\r\n"
-
-    begin
-      @mutex.lock if @multithread
-      socket.write command
-      result = socket.gets
-      raise_on_error_response! result
-      result
-    rescue SocketError, SystemCallError, IOError => err
-      server.close
-      raise MemCacheError, err.message
-    ensure
-      @mutex.unlock if @multithread
-    end
-  end
-
-  ##
-  # Removes +key+ from the cache in +expiry+ seconds.
-
-  def delete(key, expiry = 0)
-    @mutex.lock if @multithread
-
-    raise MemCacheError, "No active servers" unless active?
-    cache_key = make_cache_key key
-    server = get_server_for_key cache_key
-
-    sock = server.socket
-    raise MemCacheError, "No connection to server" if sock.nil?
-
-    begin
-      sock.write "delete #{cache_key} #{expiry}\r\n"
-      result = sock.gets
-      raise_on_error_response! result
-      result
-    rescue SocketError, SystemCallError, IOError => err
-      server.close
-      raise MemCacheError, err.message
-    end
-  ensure
-    @mutex.unlock if @multithread
-  end
-
-  ##
-  # Flush the cache from all memcache servers.
-
-  def flush_all
-    raise MemCacheError, 'No active servers' unless active?
-    raise MemCacheError, "Update of readonly cache" if @readonly
-    begin
-      @mutex.lock if @multithread
-      @servers.each do |server|
-        begin
-          sock = server.socket
-          raise MemCacheError, "No connection to server" if sock.nil?
-          sock.write "flush_all\r\n"
-          result = sock.gets
-          raise_on_error_response! result
-          result
-        rescue SocketError, SystemCallError, IOError => err
-          server.close
-          raise MemCacheError, err.message
-        end
-      end
-    ensure
-      @mutex.unlock if @multithread
-    end
-  end
-
-  ##
-  # Reset the connection to all memcache servers.  This should be called if
-  # there is a problem with a cache lookup that might have left the connection
-  # in a corrupted state.
-
-  def reset
-    @servers.each { |server| server.close }
-  end
-
-  ##
-  # Returns statistics for each memcached server.  An explanation of the
-  # statistics can be found in the memcached docs:
-  #
-  # http://code.sixapart.com/svn/memcached/trunk/server/doc/protocol.txt
-  #
-  # Example:
-  #
-  #   >> pp CACHE.stats
-  #   {"localhost:11211"=>
-  #     {"bytes"=>4718,
-  #      "pid"=>20188,
-  #      "connection_structures"=>4,
-  #      "time"=>1162278121,
-  #      "pointer_size"=>32,
-  #      "limit_maxbytes"=>67108864,
-  #      "cmd_get"=>14532,
-  #      "version"=>"1.2.0",
-  #      "bytes_written"=>432583,
-  #      "cmd_set"=>32,
-  #      "get_misses"=>0,
-  #      "total_connections"=>19,
-  #      "curr_connections"=>3,
-  #      "curr_items"=>4,
-  #      "uptime"=>1557,
-  #      "get_hits"=>14532,
-  #      "total_items"=>32,
-  #      "rusage_system"=>0.313952,
-  #      "rusage_user"=>0.119981,
-  #      "bytes_read"=>190619}}
-  #   => nil
-
-  def stats
-    raise MemCacheError, "No active servers" unless active?
-    server_stats = {}
-
-    @servers.each do |server|
-      sock = server.socket
-      raise MemCacheError, "No connection to server" if sock.nil?
-
-      value = nil
-      begin
-        sock.write "stats\r\n"
-        stats = {}
-        while line = sock.gets do
-          raise_on_error_response! line
-          break if line == "END\r\n"
-          if line =~ /\ASTAT ([\w]+) ([\w\.\:]+)/ then
-            name, value = $1, $2
-            stats[name] = case name
-                          when 'version'
-                            value
-                          when 'rusage_user', 'rusage_system' then
-                            seconds, microseconds = value.split(/:/, 2)
-                            microseconds ||= 0
-                            Float(seconds) + (Float(microseconds) / 1_000_000)
-                          else
-                            if value =~ /\A\d+\Z/ then
-                              value.to_i
-                            else
-                              value
-                            end
-                          end
-          end
-        end
-        server_stats["#{server.host}:#{server.port}"] = stats
-      rescue SocketError, SystemCallError, IOError => err
-        server.close
-        raise MemCacheError, err.message
-      end
-    end
-
-    server_stats
-  end
-
-  ##
-  # Shortcut to get a value from the cache.
-
-  alias [] get
-
-  ##
-  # Shortcut to save a value in the cache.  This method does not set an
-  # expiration on the entry.  Use set to specify an explicit expiry.
-
-  def []=(key, value)
-    set key, value
-  end
-
-  protected
-
-  ##
-  # Create a key for the cache, incorporating the namespace qualifier if
-  # requested.
-
-  def make_cache_key(key)
-    if namespace.nil? then
-      key
-    else
-      "#{@namespace}:#{key}"
-    end
-  end
-
-  ##
-  # Pick a server to handle the request based on a hash of the key.
-
-  def get_server_for_key(key)
-    raise ArgumentError, "illegal character in key #{key.inspect}" if
-      key =~ /\s/
-    raise ArgumentError, "key too long #{key.inspect}" if key.length > 250
-    raise MemCacheError, "No servers available" if @servers.empty?
-    return @servers.first if @servers.length == 1
-
-    hkey = hash_for key
-
-    20.times do |try|
-      server = @buckets[hkey % @buckets.nitems]
-      return server if server.alive?
-      hkey += hash_for "#{try}#{key}"
-    end
-
-    raise MemCacheError, "No servers available"
-  end
-
-  ##
-  # Returns an interoperable hash value for +key+.  (I think, docs are
-  # sketchy for down servers).
-
-  def hash_for(key)
-    (key.crc32_ITU_T >> 16) & 0x7fff
-  end
-
-  ##
-  # Performs a raw decr for +cache_key+ from +server+.  Returns nil if not
-  # found.
-
-  def cache_decr(server, cache_key, amount)
-    socket = server.socket
-    socket.write "decr #{cache_key} #{amount}\r\n"
-    text = socket.gets
-    raise_on_error_response! text
-    return nil if text == "NOT_FOUND\r\n"
-    return text.to_i
-  end
-
-  ##
-  # Fetches the raw data for +cache_key+ from +server+.  Returns nil on cache
-  # miss.
-
-  def cache_get(server, cache_key)
-    socket = server.socket
-    socket.write "get #{cache_key}\r\n"
-    keyline = socket.gets # "VALUE <key> <flags> <bytes>\r\n"
-
-    if keyline.nil? then
-      server.close
-      raise MemCacheError, "lost connection to #{server.host}:#{server.port}"
-    end
-
-    raise_on_error_response! keyline
-    return nil if keyline == "END\r\n"
-
-    unless keyline =~ /(\d+)\r/ then
-      server.close
-      raise MemCacheError, "unexpected response #{keyline.inspect}"
-    end
-    value = socket.read $1.to_i
-    socket.read 2 # "\r\n"
-    socket.gets   # "END\r\n"
-    return value
-  end
-
-  ##
-  # Fetches +cache_keys+ from +server+ using a multi-get.
-
-  def cache_get_multi(server, cache_keys)
-    values = {}
-    socket = server.socket
-    socket.write "get #{cache_keys}\r\n"
-
-    while keyline = socket.gets do
-      return values if keyline == "END\r\n"
-      raise_on_error_response! keyline
-
-      unless keyline =~ /\AVALUE (.+) (.+) (.+)/ then
-        server.close
-        raise MemCacheError, "unexpected response #{keyline.inspect}"
-      end
-
-      key, data_length = $1, $3
-      values[$1] = socket.read data_length.to_i
-      socket.read(2) # "\r\n"
-    end
-
-    server.close
-    raise MemCacheError, "lost connection to #{server.host}:#{server.port}"
-  end
-
-  ##
-  # Performs a raw incr for +cache_key+ from +server+.  Returns nil if not
-  # found.
-
-  def cache_incr(server, cache_key, amount)
-    socket = server.socket
-    socket.write "incr #{cache_key} #{amount}\r\n"
-    text = socket.gets
-    raise_on_error_response! text
-    return nil if text == "NOT_FOUND\r\n"
-    return text.to_i
-  end
-
-  ##
-  # Handles +error+ from +server+.
-
-  def handle_error(server, error)
-    server.close if server
-    new_error = MemCacheError.new error.message
-    new_error.set_backtrace error.backtrace
-    raise new_error
-  end
-
-  ##
-  # Performs setup for making a request with +key+ from memcached.  Returns
-  # the server to fetch the key from and the complete key to use.
-
-  def request_setup(key)
-    raise MemCacheError, 'No active servers' unless active?
-    cache_key = make_cache_key key
-    server = get_server_for_key cache_key
-    raise MemCacheError, 'No connection to server' if server.socket.nil?
-    return server, cache_key
-  end
-
-  def threadsafe_cache_decr(server, cache_key, amount) # :nodoc:
-    @mutex.lock
-    cache_decr server, cache_key, amount
-  ensure
-    @mutex.unlock
-  end
-
-  def threadsafe_cache_get(server, cache_key) # :nodoc:
-    @mutex.lock
-    cache_get server, cache_key
-  ensure
-    @mutex.unlock
-  end
-
-  def threadsafe_cache_get_multi(socket, cache_keys) # :nodoc:
-    @mutex.lock
-    cache_get_multi socket, cache_keys
-  ensure
-    @mutex.unlock
-  end
-
-  def threadsafe_cache_incr(server, cache_key, amount) # :nodoc:
-    @mutex.lock
-    cache_incr server, cache_key, amount
-  ensure
-    @mutex.unlock
-  end
-
-  def raise_on_error_response!(response)
-    if response =~ /\A(?:CLIENT_|SERVER_)?ERROR (.*)/
-      raise MemCacheError, $1.strip
-    end
-  end
-
-
-  ##
-  # This class represents a memcached server instance.
-
-  class Server
-
-    ##
-    # The amount of time to wait to establish a connection with a memcached
-    # server.  If a connection cannot be established within this time limit,
-    # the server will be marked as down.
-
-    CONNECT_TIMEOUT = 0.25
-
-    ##
-    # The amount of time to wait before attempting to re-establish a
-    # connection with a server that is marked dead.
-
-    RETRY_DELAY = 30.0
-
-    ##
-    # The host the memcached server is running on.
-
-    attr_reader :host
-
-    ##
-    # The port the memcached server is listening on.
-
-    attr_reader :port
-
-    ##
-    # The weight given to the server.
-
-    attr_reader :weight
-
-    ##
-    # The time of next retry if the connection is dead.
-
-    attr_reader :retry
-
-    ##
-    # A text status string describing the state of the server.
-
-    attr_reader :status
-
-    ##
-    # Create a new MemCache::Server object for the memcached instance
-    # listening on the given host and port, weighted by the given weight.
-
-    def initialize(memcache, host, port = DEFAULT_PORT, weight = DEFAULT_WEIGHT)
-      raise ArgumentError, "No host specified" if host.nil? or host.empty?
-      raise ArgumentError, "No port specified" if port.nil? or port.to_i.zero?
-
-      @memcache = memcache
-      @host   = host
-      @port   = port.to_i
-      @weight = weight.to_i
-
-      @multithread = @memcache.multithread
-      @mutex = Mutex.new
-
-      @sock   = nil
-      @retry  = nil
-      @status = 'NOT CONNECTED'
-    end
-
-    ##
-    # Return a string representation of the server object.
-
-    def inspect
-      "<MemCache::Server: %s:%d [%d] (%s)>" % [@host, @port, @weight, @status]
-    end
-
-    ##
-    # Check whether the server connection is alive.  This will cause the
-    # socket to attempt to connect if it isn't already connected and or if
-    # the server was previously marked as down and the retry time has
-    # been exceeded.
-
-    def alive?
-      !!socket
-    end
-
-    ##
-    # Try to connect to the memcached server targeted by this object.
-    # Returns the connected socket object on success or nil on failure.
-
-    def socket
-      @mutex.lock if @multithread
-      return @sock if @sock and not @sock.closed?
-
-      @sock = nil
-
-      # If the host was dead, don't retry for a while.
-      return if @retry and @retry > Time.now
-
-      # Attempt to connect if not already connected.
-      begin
-        @sock = timeout CONNECT_TIMEOUT do
-          TCPSocket.new @host, @port
-        end
-        if Socket.constants.include? 'TCP_NODELAY' then
-          @sock.setsockopt Socket::IPPROTO_TCP, Socket::TCP_NODELAY, 1
-        end
-        @retry  = nil
-        @status = 'CONNECTED'
-      rescue SocketError, SystemCallError, IOError, Timeout::Error => err
-        mark_dead err.message
-      end
-
-      return @sock
-    ensure
-      @mutex.unlock if @multithread
-    end
-
-    ##
-    # Close the connection to the memcached server targeted by this
-    # object.  The server is not considered dead.
-
-    def close
-      @mutex.lock if @multithread
-      @sock.close if @sock && !@sock.closed?
-      @sock   = nil
-      @retry  = nil
-      @status = "NOT CONNECTED"
-    ensure
-      @mutex.unlock if @multithread
-    end
-
-    private
-
-    ##
-    # Mark the server as dead and close its socket.
-
-    def mark_dead(reason = "Unknown error")
-      @sock.close if @sock && !@sock.closed?
-      @sock   = nil
-      @retry  = Time.now + RETRY_DELAY
-
-      @status = sprintf "DEAD: %s, will retry at %s", reason, @retry
-    end
-  end
-
-  ##
-  # Base MemCache exception class.
-
-  class MemCacheError < RuntimeError; end
-
-end
-