Class CacheEngine
Storage engine for CakePHP caching
Property Summary
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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
Delete a single config key
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_configRead() protected
Read a config variable
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_configWrite() protected
Write a config variable
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_key() protected
Generates a safe key, taking account of the configured key prefix
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clear() abstract public
Delete all keys from the cache
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clearGroup() public
Clears all values belonging to a group. Is up to the implementing engine to decide whether actually delete the keys or just simulate it to achieve the same result.
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config() public
Usage
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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() abstract public
Decrement a number under the key and return decremented value
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delete() abstract 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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groups() public
Does whatever initialization for each group is required and returns the
group valuefor each of them, this is the token representing each group in the cache key -
increment() abstract public
Increment a number under the key and return incremented value
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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() abstract public
Read a key from the cache
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readMany() public
Read multiple keys from the cache
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write() abstract public
Write value for a key into cache
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writeMany() public
Write data for many keys into cache
Method Detail
_configDelete() ¶ protected
_configDelete(string $key): voidDelete a single config key
Parameters
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string$key Key to delete.
Returns
voidThrows
Cake\Core\Exception\Exceptionif attempting to clobber existing config
_configRead() ¶ protected
_configRead(string|null $key): mixedRead a config variable
Parameters
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string|null$key Key to read.
Returns
mixed_configWrite() ¶ protected
_configWrite(string|array $key, mixed $value, bool|string $merge = false): voidWrite a config variable
Parameters
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string|array$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 $key): mixedGenerates a safe key, taking account of the configured key prefix
Parameters
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string$key the key passed over
Returns
mixedThrows
InvalidArgumentExceptionIf key's value is empty
clear() ¶ abstract public
clear(bool $check): boolDelete all keys from the cache
Parameters
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bool$check if true will check expiration, otherwise delete all
Returns
boolclearGroup() ¶ public
clearGroup(string $group): boolClears all values belonging to a group. Is up to the implementing engine to decide whether actually delete the keys or just simulate it to achieve the same result.
Parameters
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string$group name of the group to be cleared
Returns
boolconfig() ¶ public
config(string|array|null $key = null, mixed|null $value = null, bool $merge = true): mixedUsage
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
mixedThrows
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->config('key', $value);Setting a nested value:
$this->config('some.nested.key', $value);Updating multiple config settings at the same time:
$this->config(['one' => 'value', 'another' => 'value']);Parameters
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string|array$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() ¶ abstract public
decrement(string $key, int $offset = 1): bool|intDecrement a number under the key and return decremented value
Parameters
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string$key Identifier for the data
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int$offset optional How much to subtract
Returns
bool|intdelete() ¶ abstract public
delete(string $key): boolDelete a key from the cache
Parameters
-
string$key Identifier for the data
Returns
booldeleteMany() ¶ public
deleteMany(array $keys): arrayDeletes keys from the cache
Parameters
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array$keys An array of identifiers for the data
Returns
arraygc() ¶ 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
voidgroups() ¶ public
groups(): arrayDoes whatever initialization for each group is required
and returns the group value for each of them, this is
the token representing each group in the cache key
Returns
arrayincrement() ¶ abstract public
increment(string $key, int $offset = 1): bool|intIncrement a number under the key and return incremented value
Parameters
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string$key Identifier for the data
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int$offset optional How much to add
Returns
bool|intinit() ¶ public
init(array $config = []): boolInitialize the cache engine
Called automatically by the cache frontend. Merge the runtime config with the defaults before use.
Parameters
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array$config optional Associative array of parameters for the engine
Returns
boolkey() ¶ public
key(string $key): bool|stringGenerates a safe key for use with cache engine storage engines.
Parameters
-
string$key the key passed over
Returns
bool|stringread() ¶ abstract public
read(string $key): mixedRead a key from the cache
Parameters
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string$key Identifier for the data
Returns
mixedreadMany() ¶ public
readMany(array $keys): arrayRead multiple keys from the cache
Parameters
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array$keys An array of identifiers for the data
Returns
arraywrite() ¶ abstract public
write(string $key, mixed $value): boolWrite value for a key into cache
Parameters
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string$key Identifier for the data
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mixed$value Data to be cached
Returns
boolwriteMany() ¶ public
writeMany(array $data): arrayWrite data for many keys into cache
Parameters
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array$data An array of data to be stored in the cache
Returns
arrayProperty Detail
$_configInitialized ¶ protected
Whether the config property has already been configured with defaults
Type
bool$_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.
Type
array$_groupPrefix ¶ protected
Contains the compiled string with all groups prefixes to be prepended to every key in this cache engine
Type
string