Class XcacheEngine

Xcache storage engine for cache

Properties summary

$_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

Method Summary

_auth() protected

Populates and reverses $_SERVER authentication values Makes necessary changes (and reverting them back) in $_SERVER
_configDelete() protected

Deletes a single config key.
_configRead() protected

Reads a config key.
_configWrite() protected

Writes a config key.
_key() protected

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

Gets/Sets the config.
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

Deletes keys from the cache
gc() public

Garbage collection
getConfig() public

Returns the config.
getConfigOrFail() public

Returns the config for this specific key.
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 If the cache key is not an integer it will be treated as 0
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 multiple keys from the cache
setConfig() public

Sets the config.
warning() protected

Cache Engines may trigger warnings if they encounter failures during operation, if option warnOnWriteFailures is set to true.
write() public

Write data for key into cache
writeMany() public

Write data for many keys into cache

Method Detail

_auth() protected

_auth(mixed $reverse)

Populates and reverses $_SERVER authentication values Makes necessary changes (and reverting them back) in $_SERVER

This has to be done because xcache_clear_cache() needs to pass Basic Http Auth (see xcache.admin configuration config)

Parameters

bool $reverse optional: Revert changes

_configDelete() protected

_configDelete(mixed $key)

Deletes a single config key.

Parameters

string $key: Key to delete.

Throws

Cake\Core\Exception\Exception
if attempting to clobber existing config

_configRead() protected

_configRead(mixed $key)

Reads a config key.

Parameters

string|null $key: Key to read.

Returns

mixed

_configWrite() protected

_configWrite(mixed $key, mixed $value, mixed $merge)

Writes a config key.

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.

Throws

Cake\Core\Exception\Exception
if attempting to clobber existing config

_key() protected

_key(mixed $key)

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

Parameters

string $key: the key passed over

Returns

string

Key

Throws

InvalidArgumentException
If key's value is empty

add() public

add(mixed $key, mixed $value)

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

True if the data was successfully cached, false on failure.

clear() public

clear(mixed $check)

Delete all keys from the cache

Parameters

bool $check: If true no deletes will occur and instead CakePHP will rely on key TTL values. Unused for Xcache engine.

Returns

bool

True if the cache was successfully cleared, false otherwise

clearGroup() public

clearGroup(mixed $group)

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: The group to clear.

Returns

bool

success

config() public

config(mixed $key, mixed $value, mixed $merge)

Gets/Sets the config.

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

Config value being read, or the object itself on write operations.

Throws

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

configShallow() public

configShallow(mixed $key, mixed $value)

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->configShallow('key', $value);

Setting a nested value:

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

Updating multiple config settings at the same time:

$this->configShallow(['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(mixed $key, mixed $offset)

Decrements the value of an integer cached key.

If the cache key is not an integer it will be treated as 0

Parameters

string $key: Identifier for the data
int $offset optional: How much to subtract

Returns

int|false

New decremented value, false otherwise

delete() public

delete(mixed $key)

Delete a key from the cache

Parameters

string $key: Identifier for the data

Returns

bool

True if the value was successfully deleted, false if it didn't exist or couldn't be removed

deleteMany() public

deleteMany(mixed $keys)

Deletes keys from the cache

Parameters

array $keys: An array of identifiers for the data

Returns

array

For each provided cache key (given back as the array key) true if the value was successfully deleted, false if it didn't exist or couldn't be removed

gc() public

gc(mixed $expires)

Garbage collection

Permanently remove all expired and deleted data

Parameters

int|null $expires optional: [optional] An expires timestamp, invalidating all data before.

getConfig() public

getConfig(mixed $key, mixed $default)

Returns the config.

Usage

Reading the whole config:

$this->getConfig();

Reading a specific value:

$this->getConfig('key');

Reading a nested value:

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

Reading with default value:

$this->getConfig('some-key', 'default-value');

Parameters

string|null $key optional: The key to get or null for the whole config.
mixed|null $default optional: The return value when the key does not exist.

Returns

mixed|null

Configuration data at the named key or null if the key does not exist.

getConfigOrFail() public

getConfigOrFail(mixed $key)

Returns the config for this specific key.

The config value for this key must exist, it can never be null.

Parameters

string|null $key: The key to get.

Returns

mixed

Configuration data at the named key

Throws

InvalidArgumentException

groups() public

groups()

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

string[]

increment() public

increment(mixed $key, mixed $offset)

Increments the value of an integer cached key If the cache key is not an integer it will be treated as 0

Parameters

string $key: Identifier for the data
int $offset optional: How much to increment

Returns

int|false

New incremented value, false otherwise

init() public

init(array $config)

Initialize the Cache Engine

Called automatically by the cache frontend

Parameters

array $config optional: array of setting for the engine

Returns

bool

True if the engine has been successfully initialized, false if not

key() public

key(mixed $key)

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

Parameters

string $key: the key passed over

Returns

string|false

string key or false

read() public

read(mixed $key)

Read a key from the cache

Parameters

string $key: Identifier for the data

Returns

mixed

The cached data, or false if the data doesn't exist, has expired, or if there was an error fetching it

readMany() public

readMany(mixed $keys)

Read multiple keys from the cache

Parameters

array $keys: An array of identifiers for the data

Returns

array

For each cache key (given as the array key) the cache data associated or false if the data doesn't exist, has expired, or if there was an error fetching it

setConfig() public

setConfig(mixed $key, mixed $value, mixed $merge)

Sets the config.

Usage

Setting a specific value:

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

Setting a nested value:

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

Updating multiple config settings at the same time:

$this->setConfig(['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.
bool $merge optional: Whether to recursively merge or overwrite existing config, defaults to true.

Returns

$this

Throws

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

warning() protected

warning(mixed $message)

Cache Engines may trigger warnings if they encounter failures during operation, if option warnOnWriteFailures is set to true.

Parameters

string $message: The warning message.

write() public

write(mixed $key, mixed $value)

Write data for key into cache

Parameters

string $key: Identifier for the data
mixed $value: Data to be cached

Returns

bool

True if the data was successfully cached, false on failure

writeMany() public

writeMany(mixed $data)

Write data for many keys into cache

Parameters

array $data: An array of data to be stored in the cache

Returns

array

of bools for each key provided, true if the data was successfully cached, false on failure

Property Detail

`$_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

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.
prefix Prefix appended 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.
PHP_AUTH_USER xcache.admin.user
PHP_AUTH_PW xcache.admin.password

Type

array

`$_groupPrefix` protected

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

Type

string

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https://api.cakephp.org/3.9/class-Cake.Cache.Engine.XcacheEngine.html