Class ApcuEngine
APCu storage engine for cache
Property Summary
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$_compiledGroupNames protected
string[]Contains the compiled group names (prefixed with the global configuration prefix)
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$_config protected
arrayRuntime config
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$_configInitialized protected
boolWhether the config property has already been configured with defaults
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$_defaultConfig protected
arrayThe default cache configuration is overridden in most cache adapters. These are the keys that are common to all adapters. If overridden, this property is not used.
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$_groupPrefix protected
stringContains the compiled string with all groups prefixes to be prepended to every key in this cache engine
Method Summary
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_configDelete() protected
Deletes a single config key.
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_configRead() protected
Reads a config key.
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_configWrite() protected
Writes a config key.
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_key() protected
Generates a safe key, taking account of the configured key prefix
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add() public
Write data for key into cache if it doesn't exist already. If it already exists, it fails and returns false.
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clear() public
Delete all keys from the cache. This will clear every cache config using APC.
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clearGroup() public
Increments the group value to simulate deletion of all keys under a group old values will remain in storage until they expire.
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config() public deprecated
Gets/Sets the config.
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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
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delete() public
Delete a key from the cache
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deleteMany() public
Deletes keys from the cache
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gc() public
Garbage collection
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getConfig() public
Returns the config.
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groups() public
Returns the
group valuefor 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
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init() public
Initialize the Cache Engine
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key() public
Generates a safe key for use with cache engine storage engines.
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read() public
Read a key from the cache
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readMany() public
Read multiple keys from the cache
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setConfig() public
Sets the config.
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warning() protected
Cache Engines may trigger warnings if they encounter failures during operation, if option warnOnWriteFailures is set to true.
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write() public
Write data for key into cache
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writeMany() public
Write data for many keys into cache
Method Detail
_configDelete() ¶ protected
_configDelete(string $key): voidDeletes a single config key.
Parameters
-
string$key Key to delete.
Returns
voidThrows
Cake\Core\Exception\Exceptionif attempting to clobber existing config
_configRead() ¶ protected
_configRead(string|null $key): mixedReads a config key.
Parameters
-
string|null$key Key to read.
Returns
mixed_configWrite() ¶ protected
_configWrite(string|array $key, mixed $value, bool|string $merge = false): voidWrites a config key.
Parameters
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string|array$key Key to write to.
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mixed$value Value to write.
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bool|string$merge optional True to merge recursively, 'shallow' for simple merge, false to overwrite, defaults to false.
Returns
voidThrows
Cake\Core\Exception\Exceptionif attempting to clobber existing config
_key() ¶ protected
_key(string $key): stringGenerates a safe key, taking account of the configured key prefix
Parameters
-
string$key the key passed over
Returns
stringKey
Throws
InvalidArgumentExceptionIf key's value is empty
add() ¶ public
add(string $key, mixed $value): boolWrite data for key into cache if it doesn't exist already. If it already exists, it fails and returns false.
Defaults to a non-atomic implementation. Subclasses should prefer atomic implementations.
Parameters
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string$key Identifier for the data.
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mixed$value Data to be cached.
Returns
boolTrue if the data was successfully cached, false on failure.
Links
clear() ¶ public
clear(bool $check): boolDelete all keys from the cache. This will clear every cache config using APC.
Parameters
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bool$check If true, nothing will be cleared, as entries are removed from APC as they expired. This flag is really only used by FileEngine.
Returns
boolTrue Returns true.
Links
https://secure.php.net/manual/en/function.apcu-delete.php
clearGroup() ¶ public
clearGroup(string $group): boolIncrements the group value to simulate deletion of all keys under a group old values will remain in storage until they expire.
Parameters
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string$group The group to clear.
Returns
boolsuccess
Links
config() ¶ public
config(string|array|null $key = null, mixed|null $value = null, bool $merge = true): mixedGets/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:
$this->config(['one' => 'value', 'another' => 'value']);Parameters
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string|array|null$key optional The key to get/set, or a complete array of configs.
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mixed|null$value optional The value to set.
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bool$merge optional Whether to recursively merge or overwrite existing config, defaults to true.
Returns
mixedConfig value being read, or the object itself on write operations.
Throws
Cake\Core\Exception\ExceptionWhen trying to set a key that is invalid.
configShallow() ¶ public
configShallow(string|array $key, mixed|null $value = null): $thisMerge 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:
$this->configShallow(['one' => 'value', 'another' => 'value']);Parameters
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string|array$key The key to set, or a complete array of configs.
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mixed|null$value optional The value to set.
Returns
$thisdecrement() ¶ public
decrement(string $key, int $offset = 1): int|falseDecrements the value of an integer cached key
Parameters
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string$key Identifier for the data
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int$offset optional How much to subtract
Returns
int|falseNew decremented value, false otherwise
Links
delete() ¶ public
delete(string $key): boolDelete a key from the cache
Parameters
-
string$key Identifier for the data
Returns
boolTrue if the value was successfully deleted, false if it didn't exist or couldn't be removed
Links
deleteMany() ¶ public
deleteMany(array $keys): arrayDeletes keys from the cache
Parameters
-
array$keys An array of identifiers for the data
Returns
arrayFor 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(int|null $expires = null): voidGarbage collection
Permanently remove all expired and deleted data
Parameters
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int|null$expires optional [optional] An expires timestamp, invalidating all data before.
Returns
voidgetConfig() ¶ public
getConfig(string|null $key = null, mixed $default = null): mixedReturns 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.
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mixed$default optional The return value when the key does not exist.
Returns
mixedConfiguration data at the named key or null if the key does not exist.
groups() ¶ public
groups(): string[]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[]Links
https://secure.php.net/manual/en/function.apcu-store.php
increment() ¶ public
increment(string $key, int $offset = 1): int|falseIncrements the value of an integer cached key
Parameters
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string$key Identifier for the data
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int$offset optional How much to increment
Returns
int|falseNew incremented value, false otherwise
Links
init() ¶ public
init(array $config = []): boolInitialize the Cache Engine
Called automatically by the cache frontend
Parameters
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array$config optional array of setting for the engine
Returns
boolTrue if the engine has been successfully initialized, false if not
key() ¶ public
key(string $key): string|falseGenerates a safe key for use with cache engine storage engines.
Parameters
-
string$key the key passed over
Returns
string|falsestring key or false
read() ¶ public
read(string $key): mixedRead a key from the cache
Parameters
-
string$key Identifier for the data
Returns
mixedThe cached data, or false if the data doesn't exist, has expired, or if there was an error fetching it
Links
readMany() ¶ public
readMany(array $keys): arrayRead multiple keys from the cache
Parameters
-
array$keys An array of identifiers for the data
Returns
arrayFor 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(string|array $key, mixed|null $value = null, bool $merge = true): $thisSets 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.
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mixed|null$value optional The value to set.
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bool$merge optional Whether to recursively merge or overwrite existing config, defaults to true.
Returns
$thisThrows
Cake\Core\Exception\ExceptionWhen trying to set a key that is invalid.
warning() ¶ protected
warning(string $message): voidCache Engines may trigger warnings if they encounter failures during operation, if option warnOnWriteFailures is set to true.
Parameters
-
string$message The warning message.
Returns
voidwrite() ¶ public
write(string $key, mixed $value): boolWrite data for key into cache
Parameters
-
string$key Identifier for the data
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mixed$value Data to be cached
Returns
boolTrue if the data was successfully cached, false on failure
Links
writeMany() ¶ public
writeMany(array $data): arrayWrite data for many keys into cache
Parameters
-
array$data An array of data to be stored in the cache
Returns
arrayof bools for each key provided, true if the data was successfully cached, false on failure
Property Detail
$_compiledGroupNames ¶ protected
Contains the compiled group names (prefixed with the global configuration prefix)
Type
string[]$_configInitialized ¶ protected
Whether the config property has already been configured with defaults
Type
bool$_defaultConfig ¶ protected
The default cache configuration is overridden in most cache adapters. These are the keys that are common to all adapters. If overridden, this property is not used.
durationSpecify how long items in this cache configuration last.groupsList of groups or 'tags' associated to every key stored in this config. handy for deleting a complete group from cache.prefixPrefix appended to all entries. Good for when you need to share a keyspace with either another cache config or another application.probabilityProbability of hitting a cache gc cleanup. Setting to 0 will disable cache::gc from ever being called automatically.warnOnWriteFailuresSome engines, such as ApcuEngine, may raise warnings on write failures.
Type
array$_groupPrefix ¶ protected
Contains the compiled string with all groups prefixes to be prepended to every key in this cache engine
Type
string