Class: Memcache
- Inherits:
-
Object
show all
- Defined in:
- lib/memcache.rb,
lib/memcache/base.rb,
lib/memcache/server.rb,
lib/memcache/migration.rb,
lib/memcache/pg_server.rb,
lib/memcache/segmented.rb,
lib/memcache/null_server.rb,
lib/memcache/local_server.rb,
ext/native_server.c
Defined Under Namespace
Modules: Segmented
Classes: Base, ClientError, ConnectionError, Error, LocalServer, Migration, NativeServer, NullServer, PGServer, Pool, SegmentedNativeServer, SegmentedServer, Server, ServerError
Constant Summary
collapse
- DEFAULT_EXPIRY =
0
- LOCK_TIMEOUT =
5
- WRITE_LOCK_WAIT =
1
Instance Attribute Summary collapse
Class Method Summary
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Instance Method Summary
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-
#[](key) ⇒ Object
-
#[]=(key, value) ⇒ Object
-
#add(key, value, opts = {}) ⇒ Object
-
#add_or_get(key, value, opts = {}) ⇒ Object
-
#append(key, value) ⇒ Object
-
#cas(key, value, opts) ⇒ Object
-
#clone ⇒ Object
-
#count(key) ⇒ Object
-
#decr(key, amount = 1) ⇒ Object
-
#delete(key) ⇒ Object
-
#flush_all(opts = {}) ⇒ Object
(also: #clear)
-
#get(keys, opts = {}) ⇒ Object
-
#get_or_add(key, *args) ⇒ Object
-
#get_or_set(key, *args) ⇒ Object
-
#get_some(keys, opts = {}) ⇒ Object
-
#in_namespace(namespace) ⇒ Object
-
#incr(key, amount = 1) ⇒ Object
-
#initialize(opts) ⇒ Memcache
constructor
A new instance of Memcache.
-
#inspect ⇒ Object
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#lock(key, opts = {}) ⇒ Object
-
#lock_key(key) ⇒ Object
-
#locked?(key) ⇒ Boolean
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#prepend(key, value) ⇒ Object
-
#read(key, opts = nil) ⇒ Object
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#read_multi(*keys) ⇒ Object
-
#replace(key, value, opts = {}) ⇒ Object
-
#reset ⇒ Object
-
#set(key, value, opts = {}) ⇒ Object
-
#stats(field = nil) ⇒ Object
-
#unlock(key) ⇒ Object
-
#update(key, opts = {}) ⇒ Object
-
#with_lock(key, opts = {}) ⇒ Object
-
#write(key, value, opts = nil) ⇒ Object
Constructor Details
#initialize(opts) ⇒ Memcache
Returns a new instance of Memcache.
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# File 'lib/memcache.rb', line 35
def initialize(opts)
@default_expiry = opts[:default_expiry] || DEFAULT_EXPIRY
@backup = opts[:backup] @hash_with_prefix = opts[:hash_with_prefix].nil? ? true : opts[:hash_with_prefix]
if opts[:native]
native_opts = opts.clone
native_opts[:servers] = (opts[:servers] || [ opts[:server] ]).collect do |server|
server.is_a?(Hash) ? "#{server[:host]}:#{server[:port]}:#{server[:weight]}" : server
end
native_opts[:hash] ||= :crc unless native_opts[:ketama] or native_opts[:ketama_wieghted]
native_opts[:hash_with_prefix] = @hash_with_prefix
server_class = opts[:segment_large_values] ? SegmentedNativeServer : NativeServer
@servers = [server_class.new(native_opts)]
else
raise "only CRC hashing is supported unless :native => true" if opts[:hash] and opts[:hash] != :crc
server_class = opts[:segment_large_values] ? SegmentedServer : Server
@servers = (opts[:servers] || [ opts[:server] ]).collect do |server|
case server
when Hash
server = server_class.new(opts.merge(server))
when String
host, port = server.split(':')
server = server_class.new(opts.merge(:host => host, :port => port))
when Class
server = server.new
when :local
server = Memcache::LocalServer.new
end
server
end
end
@server = @servers.first if @servers.size == 1 and @backup.nil?
self.namespace = opts[:namespace] if opts[:namespace]
end
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Instance Attribute Details
Returns the value of attribute backup.
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# File 'lib/memcache.rb', line 19
def backup
@backup
end
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#default_expiry ⇒ Object
Returns the value of attribute default_expiry.
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# File 'lib/memcache.rb', line 19
def default_expiry
@default_expiry
end
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#namespace ⇒ Object
Returns the value of attribute namespace.
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# File 'lib/memcache.rb', line 19
def namespace
@namespace
end
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Returns the value of attribute servers.
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# File 'lib/memcache.rb', line 19
def servers
@servers
end
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Class Method Details
.init(yaml_file = nil) ⇒ Object
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# File 'lib/memcache.rb', line 349
def self.init(yaml_file = nil)
yaml_file = File.join(Rails.root, 'config', 'memcached.yml')
if File.exists?(yaml_file)
yaml = YAML.load_file(yaml_file)
defaults = (yaml.delete('defaults') || {}).symbolize_keys
config = (yaml[Rails.env] || {}).symbolize_keys
if not config.empty? and not config[:disabled]
if config[:servers]
opts = defaults.merge(config.symbolize_keys)
Object.const_set('CACHE', Memcache.new(opts))
else
config.each do |connection, opts|
opts = defaults.merge(opts.symbolize_keys)
Memcache.pool[connection] = Memcache.new(opts)
end
end
end
end
end
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Instance Method Details
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# File 'lib/memcache.rb', line 341
def [](key)
get(key)
end
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#[]=(key, value) ⇒ Object
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# File 'lib/memcache.rb', line 345
def []=(key, value)
set(key, value)
end
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#add(key, value, opts = {}) ⇒ Object
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# File 'lib/memcache.rb', line 153
def add(key, value, opts = {})
opts = compatible_opts(opts)
key = key.to_s
backup.add(key, value, opts) if backup
expiry = opts[:expiry] || default_expiry
flags = opts[:flags] || 0
data = marshal(value, opts)
server(key).add(key, data, expiry, flags) && value
end
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#add_or_get(key, value, opts = {}) ⇒ Object
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# File 'lib/memcache.rb', line 248
def add_or_get(key, value, opts = {})
add(key, value, opts) || get(key)
end
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#append(key, value) ⇒ Object
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# File 'lib/memcache.rb', line 186
def append(key, value)
key = key.to_s
backup.append(key, value) if backup
server(key).append(key, value)
end
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#cas(key, value, opts) ⇒ Object
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# File 'lib/memcache.rb', line 175
def cas(key, value, opts)
raise 'opts must be hash' unless opts.instance_of?(Hash)
key = key.to_s
backup.cas(key, value, opts) if backup
expiry = opts[:expiry] || default_expiry
flags = opts[:flags] || 0
data = marshal(value, opts)
server(key).cas(key, data, opts[:cas], expiry, flags) && value
end
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# File 'lib/memcache.rb', line 74
def clone
self.class.new(
:default_expiry => default_expiry,
:namespace => namespace,
:servers => servers.collect {|s| s.clone}
)
end
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#count(key) ⇒ Object
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# File 'lib/memcache.rb', line 198
def count(key)
value = get(key, :raw => true)
value.to_i if value
end
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#decr(key, amount = 1) ⇒ Object
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# File 'lib/memcache.rb', line 209
def decr(key, amount = 1)
key = key.to_s
backup.decr(key, amount) if backup
server(key).decr(key, amount)
end
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#delete(key) ⇒ Object
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# File 'lib/memcache.rb', line 305
def delete(key)
key = key.to_s
backup.delete(key) if backup
server(key).delete(key)
end
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#flush_all(opts = {}) ⇒ Object
Also known as:
clear
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# File 'lib/memcache.rb', line 311
def flush_all(opts = {})
delay = opts[:delay].to_i
interval = opts[:interval].to_i
servers.each do |server|
server.flush_all(delay)
delay += interval
end
end
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#get(keys, opts = {}) ⇒ Object
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# File 'lib/memcache.rb', line 107
def get(keys, opts = {})
raise 'opts must be hash' unless opts.instance_of?(Hash)
if keys.instance_of?(Array)
keys = keys.collect {|key| key.to_s}
multi_get(keys, opts)
else
key = keys.to_s
if opts[:expiry]
value = server(key).gets(key)
cas(key, value, :raw => true, :cas => value.memcache_cas, :expiry => opts[:expiry]) if value
else
value = server(key).get(key, opts[:cas])
end
return backup.get(key, opts) if backup and value.nil?
opts[:raw] ? value : unmarshal(value, key)
end
end
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#get_or_add(key, *args) ⇒ Object
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# File 'lib/memcache.rb', line 225
def get_or_add(key, *args)
key = key.to_s
if block_given?
opts = args[0] || {}
get(key) || add(key, yield, opts) || get(key)
else
opts = args[1] || {}
get(key) || add(key, args[0], opts) || get(key)
end
end
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#get_or_set(key, *args) ⇒ Object
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# File 'lib/memcache.rb', line 237
def get_or_set(key, *args)
key = key.to_s
if block_given?
opts = args[0] || {}
get(key) || set(key, yield, opts)
else
opts = args[1] || {}
get(key) || set(key, args[0], opts)
end
end
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#get_some(keys, opts = {}) ⇒ Object
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# File 'lib/memcache.rb', line 253
def get_some(keys, opts = {})
keys = keys.collect {|key| key.to_s}
records = opts[:disable] ? {} : self.multi_get(keys, opts)
if opts[:validation]
records.delete_if do |key, value|
not opts[:validation].call(key, value)
end
end
keys_to_fetch = keys - records.keys
method = opts[:overwrite] ? :set : :add
if keys_to_fetch.any?
yield(keys_to_fetch).each do |key, value|
begin
self.send(method, key, value, opts) unless opts[:disable] or opts[:disable_write]
rescue Memcache::Error => e
raise if opts[:strict_write]
$stderr.puts "Memcache error in get_some: #{e.class} #{e.to_s} on key '#{key}' while storing value: #{value}"
end
records[key] = value
end
end
records
end
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#in_namespace(namespace) ⇒ Object
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# File 'lib/memcache.rb', line 96
def in_namespace(namespace)
begin
old_namespace = self.namespace
self.namespace = old_namespace ? "#{old_namespace}:#{namespace}" : namespace
yield
ensure
self.namespace = old_namespace
end
end
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#incr(key, amount = 1) ⇒ Object
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# File 'lib/memcache.rb', line 203
def incr(key, amount = 1)
key = key.to_s
backup.incr(key, amount) if backup
server(key).incr(key, amount)
end
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# File 'lib/memcache.rb', line 82
def inspect
"<Memcache: %d servers, ns: %p>" % [@servers.length, namespace]
end
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#lock(key, opts = {}) ⇒ Object
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# File 'lib/memcache.rb', line 278
def lock(key, opts = {})
expiry = opts[:expiry] || LOCK_TIMEOUT
add(lock_key(key), Socket.gethostname, :expiry => expiry, :raw => true)
end
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#lock_key(key) ⇒ Object
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# File 'lib/memcache.rb', line 297
def lock_key(key)
"lock:#{key}"
end
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#locked?(key) ⇒ Boolean
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# File 'lib/memcache.rb', line 301
def locked?(key)
get(lock_key(key), :raw => true)
end
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#prepend(key, value) ⇒ Object
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# File 'lib/memcache.rb', line 192
def prepend(key, value)
key = key.to_s
backup.prepend(key, value) if backup
server(key).prepend(key, value)
end
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#read(key, opts = nil) ⇒ Object
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# File 'lib/memcache.rb', line 127
def read(key, opts = nil)
opts ||= {}
get(key, opts.merge(:raw => true))
end
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#read_multi(*keys) ⇒ Object
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# File 'lib/memcache.rb', line 132
def read_multi(*keys)
get(keys)
end
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#replace(key, value, opts = {}) ⇒ Object
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# File 'lib/memcache.rb', line 164
def replace(key, value, opts = {})
opts = compatible_opts(opts)
key = key.to_s
backup.replace(key, value, opts) if backup
expiry = opts[:expiry] || default_expiry
flags = opts[:flags] || 0
data = marshal(value, opts)
server(key).replace(key, data, expiry, flags) && value
end
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# File 'lib/memcache.rb', line 321
def reset
servers.each {|server| server.close if server.respond_to?(:close)}
end
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#set(key, value, opts = {}) ⇒ Object
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# File 'lib/memcache.rb', line 136
def set(key, value, opts = {})
opts = compatible_opts(opts)
key = key.to_s
backup.set(key, value, opts) if backup
expiry = opts[:expiry] || default_expiry
flags = opts[:flags] || 0
data = marshal(value, opts)
server(key).set(key, data, expiry, flags)
value
end
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#stats(field = nil) ⇒ Object
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# File 'lib/memcache.rb', line 325
def stats(field = nil)
if field
servers.collect do |server|
server.stats[field]
end
else
stats = {}
servers.each do |server|
stats[server.name] = server.stats
end
stats
end
end
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#unlock(key) ⇒ Object
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# File 'lib/memcache.rb', line 284
def unlock(key)
delete(lock_key(key))
end
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#update(key, opts = {}) ⇒ Object
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# File 'lib/memcache.rb', line 215
def update(key, opts = {})
key = key.to_s
value = get(key, :cas => true)
if value
cas(key, yield(value), opts.merge!(:cas => value.memcache_cas))
else
add(key, yield(value), opts)
end
end
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#with_lock(key, opts = {}) ⇒ Object
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# File 'lib/memcache.rb', line 288
def with_lock(key, opts = {})
until lock(key) do
return if opts[:ignore]
sleep(WRITE_LOCK_WAIT) end
yield
unlock(key) unless opts[:keep]
end
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#write(key, value, opts = nil) ⇒ Object
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# File 'lib/memcache.rb', line 148
def write(key, value, opts = nil)
opts ||= {}
set(key, value, opts.merge(:raw => true))
end
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