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CakePHP

C CakePHP 3.3 Red Velvet API

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Class MemcachedEngine

Memcached storage engine for cache. Memcached has some limitations in the amount of control you have over expire times far in the future. See MemcachedEngine::write() for more information.

Main advantage of this Memcached engine over the memcached engine is support of binary protocol, and igbinary serialization (if memcached extension compiled with --enable-igbinary) Compressed keys can also be incremented/decremented

Namespace: Cake\Cache\Engine

Property Summary

  • $_Memcached protected
    Memcached

    memcached wrapper.

  • $_config protected
    array

    Runtime config

  • $_configInitialized protected
    bool

    Whether the config property has already been configured with defaults

  • $_defaultConfig protected
    array

    The default config used unless overridden by runtime configuration

  • $_groupPrefix protected
    string

    Contains the compiled string with all groups prefixes to be prepended to every key in this cache engine

  • $_serializers protected
    array

    List of available serializer engines

Method Summary

  • _configDelete() protected

    Delete a single config key

  • _configRead() protected

    Read a config variable

  • _configWrite() protected

    Write a config variable

  • _key() protected

    Generates a safe key, taking account of the configured key prefix

  • _parseServerString() protected

    Parses the server address into the host/port. Handles both IPv6 and IPv4 addresses and Unix sockets

  • _setOptions() protected

    Settings the memcached instance

  • add() public

    Add a key to the cache if it does not already exist.

  • clear() public

    Delete all keys from the cache

  • clearGroup() public

    Increments the group value to simulate deletion of all keys under a group old values will remain in storage until they expire.

  • config() public

    Usage

  • configShallow() public

    Merge provided config with existing config. Unlike config() which does a recursive merge for nested keys, this method does a simple merge.

  • decrement() public

    Decrements the value of an integer cached key

  • delete() public

    Delete a key from the cache

  • deleteMany() public

    Delete many keys from the cache at once

  • gc() public

    Garbage collection

  • groups() public

    Returns the group value for each of the configured groups If the group initial value was not found, then it initializes the group accordingly.

  • increment() public

    Increments the value of an integer cached key

  • init() public

    Initialize the Cache Engine

  • key() public

    Generates a safe key for use with cache engine storage engines.

  • read() public

    Read a key from the cache

  • readMany() public

    Read many keys from the cache at once

  • write() public

    Write data for key into cache. When using memcached as your cache engine remember that the Memcached pecl extension does not support cache expiry times greater than 30 days in the future. Any duration greater than 30 days will be treated as never expiring.

  • writeMany() public

    Write many cache entries to the cache at once

Method Detail

_configDelete() ¶ protected

_configDelete(string $key): void

Delete a single config key

Parameters
string $key

Key to delete.

Returns
void
Throws
Cake\Core\Exception\Exception
if attempting to clobber existing config

_configRead() ¶ protected

_configRead(string|null $key): mixed

Read a config variable

Parameters
string|null $key

Key to read.

Returns
mixed

_configWrite() ¶ protected

_configWrite(string|array $key, mixed $value, bool|string $merge = false): void

Write a config variable

Parameters
string|array $key

Key to write to.

mixed $value

Value to write.

bool|string $merge optional

True to merge recursively, 'shallow' for simple merge, false to overwrite, defaults to false.

Returns
void
Throws
Cake\Core\Exception\Exception
if attempting to clobber existing config

_key() ¶ protected

_key(string $key): mixed

Generates a safe key, taking account of the configured key prefix

Parameters
string $key

the key passed over

Returns
mixed
Throws
InvalidArgumentException
If key's value is empty

_parseServerString() ¶ protected

_parseServerString(string $server): array

Parses the server address into the host/port. Handles both IPv6 and IPv4 addresses and Unix sockets

Parameters
string $server

The server address string.

Returns
array

_setOptions() ¶ protected

_setOptions(): void

Settings the memcached instance

Returns
void
Throws
InvalidArgumentException
When the Memcached extension is not built with the desired serializer engine.

add() ¶ public

add(string $key, mixed $value): bool

Add a key to the cache if it does not already exist.

Defaults to a non-atomic implementation. Subclasses should prefer atomic implementations.

Parameters
string $key

Identifier for the data.

mixed $value

Data to be cached.

Returns
bool

clear() ¶ public

clear(bool $check): bool

Delete all keys from the cache

Parameters
bool $check

If true will check expiration, otherwise delete all.

Returns
bool

clearGroup() ¶ public

clearGroup(string $group): bool

Increments the group value to simulate deletion of all keys under a group old values will remain in storage until they expire.

Parameters
string $group

name of the group to be cleared

Returns
bool

config() ¶ public

config(string|array|null $key = null, mixed|null $value = null, bool $merge = true): mixed

Usage

Reading the whole config:

$this->config();

Reading a specific value:

$this->config('key');

Reading a nested value:

$this->config('some.nested.key');

Setting a specific value:

$this->config('key', $value);

Setting a nested value:

$this->config('some.nested.key', $value);

Updating multiple config settings at the same time:

$this->config(['one' => 'value', 'another' => 'value']);
Parameters
string|array|null $key optional

The key to get/set, or a complete array of configs.

mixed|null $value optional

The value to set.

bool $merge optional

Whether to recursively merge or overwrite existing config, defaults to true.

Returns
mixed
Throws
Cake\Core\Exception\Exception
When trying to set a key that is invalid.

configShallow() ¶ public

configShallow(string|array $key, mixed|null $value = null): $this

Merge provided config with existing config. Unlike config() which does a recursive merge for nested keys, this method does a simple merge.

Setting a specific value:

$this->config('key', $value);

Setting a nested value:

$this->config('some.nested.key', $value);

Updating multiple config settings at the same time:

$this->config(['one' => 'value', 'another' => 'value']);
Parameters
string|array $key

The key to set, or a complete array of configs.

mixed|null $value optional

The value to set.

Returns
$this

decrement() ¶ public

decrement(string $key, int $offset = 1): bool|int

Decrements the value of an integer cached key

Parameters
string $key

Identifier for the data

int $offset optional

How much to subtract

Returns
bool|int

delete() ¶ public

delete(string $key): bool

Delete a key from the cache

Parameters
string $key

Identifier for the data

Returns
bool

deleteMany() ¶ public

deleteMany(array $keys): array

Delete many keys from the cache at once

Parameters
array $keys

An array of identifiers for the data

Returns
array

gc() ¶ public

gc(int|null $expires = null): void

Garbage collection

Permanently remove all expired and deleted data

Parameters
int|null $expires optional

[optional] An expires timestamp, invalidating all data before.

Returns
void

groups() ¶ public

groups(): array

Returns the group value for each of the configured groups If the group initial value was not found, then it initializes the group accordingly.

Returns
array

increment() ¶ public

increment(string $key, int $offset = 1): bool|int

Increments the value of an integer cached key

Parameters
string $key

Identifier for the data

int $offset optional

How much to increment

Returns
bool|int

init() ¶ public

init(array $config = []): bool

Initialize the Cache Engine

Called automatically by the cache frontend

Parameters
array $config optional

array of setting for the engine

Returns
bool
Throws
InvalidArgumentException
When you try use authentication without Memcached compiled with SASL support

key() ¶ public

key(string $key): bool|string

Generates a safe key for use with cache engine storage engines.

Parameters
string $key

the key passed over

Returns
bool|string

read() ¶ public

read(string $key): mixed

Read a key from the cache

Parameters
string $key

Identifier for the data

Returns
mixed

readMany() ¶ public

readMany(array $keys): array

Read many keys from the cache at once

Parameters
array $keys

An array of identifiers for the data

Returns
array

write() ¶ public

write(string $key, mixed $value): bool

Write data for key into cache. When using memcached as your cache engine remember that the Memcached pecl extension does not support cache expiry times greater than 30 days in the future. Any duration greater than 30 days will be treated as never expiring.

Parameters
string $key

Identifier for the data

mixed $value

Data to be cached

Returns
bool
See Also
http://php.net/manual/en/memcache.set.php

writeMany() ¶ public

writeMany(array $data): array

Write many cache entries to the cache at once

Parameters
array $data

An array of data to be stored in the cache

Returns
array

Property Detail

$_Memcached ¶ protected

memcached wrapper.

Type
Memcached

$_config ¶ protected

Runtime config

Type
array

$_configInitialized ¶ protected

Whether the config property has already been configured with defaults

Type
bool

$_defaultConfig ¶ protected

The default config used unless overridden by runtime configuration

  • compress Whether to compress data
  • duration Specify how long items in this cache configuration last.
  • groups List of groups or 'tags' associated to every key stored in this config. handy for deleting a complete group from cache.
  • username Login to access the Memcache server
  • password Password to access the Memcache server
  • persistent The name of the persistent connection. All configurations using the same persistent value will share a single underlying connection.
  • prefix Prepended to all entries. Good for when you need to share a keyspace with either another cache config or another application.
  • probability Probability of hitting a cache gc cleanup. Setting to 0 will disable cache::gc from ever being called automatically.
  • serialize The serializer engine used to serialize data. Available engines are php, igbinary and json. Beside php, the memcached extension must be compiled with the appropriate serializer support.
  • servers String or array of memcached servers. If an array MemcacheEngine will use them as a pool.
  • options - Additional options for the memcached client. Should be an array of option => value. Use the \Memcached::OPT_* constants as keys.
Type
array

$_groupPrefix ¶ protected

Contains the compiled string with all groups prefixes to be prepended to every key in this cache engine

Type
string

$_serializers ¶ protected

List of available serializer engines

Memcached must be compiled with json and igbinary support to use these engines

Type
array
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