Class FileEngine

File Storage engine for cache. Filestorage is the slowest cache storage to read and write. However, it is good for servers that don't have other storage engine available, or have content which is not performance sensitive.

You can configure a FileEngine cache, using Cache::config()

Cake\Cache\CacheEngine uses Cake\Core\InstanceConfigTrait

Cake\Cache\Engine\FileEngine

Namespace: Cake\Cache\Engine
Location: Cache/Engine/FileEngine.php

Properties summary

$_File protected

SplFileObject|null
Instance of SplFileObject class
$_defaultConfig protected

array
The default config used unless overridden by runtime configuration
$_init protected

boolean
True unless FileEngine::__active(); fails

Inherited Properties

_groupPrefix _config, _configInitialized

Method Summary

_active() protected
Determine is cache directory is writable
_clearDirectory() protected
Used to clear a directory of matching files.
_setKey() protected

Sets the current cache key this class is managing, and creates a writable SplFileObject for the cache file the key is referring to.
clear() public
Delete all values from the cache
clearGroup() public
Recursively deletes all files under any directory named as $group
decrement() public
Not implemented
delete() public
Delete a key from the cache
gc() public
Garbage collection. Permanently remove all expired and deleted data
increment() public
Not implemented
init() public
Initialize File Cache Engine
key() public
Generates a safe key for use with cache engine storage engines.
read() public
Read a key from the cache
write() public
Write data for key into cache

Method Detail

_active()source protected

_active( )

Determine is cache directory is writable

Returns

boolean

_clearDirectory()source protected

_clearDirectory( string $path , integer $now , integer $threshold )

Used to clear a directory of matching files.

Parameters

string $path: The path to search.
integer $now: The current timestamp
integer $threshold: Any file not modified after this value will be deleted.

_setKey()source protected

_setKey( string $key , boolean $createKey false )

Sets the current cache key this class is managing, and creates a writable SplFileObject for the cache file the key is referring to.

Parameters

string $key: The key
boolean $createKey optional false: Whether the key should be created if it doesn't exists, or not

Returns

boolean
true if the cache key could be set, false otherwise

clear()source public

clear( boolean $check )

Delete all values from the cache

Parameters

boolean $check: Optional - only delete expired cache items

Returns

boolean
True if the cache was successfully cleared, false otherwise

clearGroup()source public

clearGroup( string $group )

Recursively deletes all files under any directory named as $group

Parameters

string $group: The group to clear.

Returns

boolean
success

Overrides

Cake\Cache\CacheEngine::clearGroup()

decrement()source public

decrement( string $key , integer $offset 1 )

Not implemented

Parameters

string $key: The key to decrement
integer $offset optional 1: The number to offset

Throws

LogicException

delete()source public

delete( string $key )

Delete a key from the cache

Parameters

string $key: Identifier for the data

Returns

boolean

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

gc()source public

gc( integer|null $expires null )

Garbage collection. Permanently remove all expired and deleted data

Parameters

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

Returns

boolean
True if garbage collection was successful, false on failure

Overrides

Cake\Cache\CacheEngine::gc()

increment()source public

increment( string $key , integer $offset 1 )

Not implemented

Parameters

string $key: The key to increment
integer $offset optional 1: The number to offset

Throws

LogicException

init()source public

init( array $config [] )

Initialize File Cache Engine

Called automatically by the cache frontend.

Parameters

array $config optional []: array of setting for the engine

Returns

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

Overrides

Cake\Cache\CacheEngine::init()

key()source public

key( string $key )

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

Parameters

string $key: the key passed over

Returns

mixed
string $key or false

Overrides

Cake\Cache\CacheEngine::key()

read()source public

read( string $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

write()source public

write( string $key , mixed $data )

Write data for key into cache

Parameters

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

Returns

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

Methods inherited from Cake\Cache\CacheEngine

_key()source protected

_key( string $key )

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

Parameters

string $key: the key passed over

Returns

mixed
string $key or false

Throws

InvalidArgumentException
If key's value is empty

add()source public

add( string $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

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

deleteMany()source public

deleteMany( array $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

groups()source public

groups( )

Does 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

array

readMany()source public

readMany( array $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

writeMany()source public

writeMany( array $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

Methods used from Cake\Core\InstanceConfigTrait

_configDelete()source protected

_configDelete( string $key )

Deletes a single config key.

Parameters

string $key: Key to delete.

Throws

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

_configRead()source protected

_configRead( string|null $key )

Reads a config key.

Parameters

string|null $key: Key to read.

Returns

mixed

_configWrite()source protected

_configWrite( string|array $key , mixed $value , boolean|string $merge false )

Writes a config key.

Parameters

string|array $key: Key to write to.
mixed $value: Value to write.
boolean|string $merge optional false: 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

config()source public

config( string|array|null $key null , mixed|null $value null , boolean $merge true )

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']);

Deprecated

3.4.0 use setConfig()/getConfig() instead.

Parameters

string|array|null $key optional null: The key to get/set, or a complete array of configs.
mixed|null $value optional null: The value to set.
boolean $merge optional true: 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()source public

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

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 null: The value to set.

Returns

$this

getConfig()source public

getConfig( string|null $key null , mixed $default null )

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

Returns

mixed
Config value being read.

setConfig()source public

setConfig( string|array $key , mixed|null $value null , boolean $merge true )

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 null: The value to set.
boolean $merge optional true: 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.

Properties detail

$_Filesource

protected SplFileObject|null

Instance of SplFileObject class

$_defaultConfigsource

protected array

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.
isWindows Automatically populated with whether the host is windows or not
lock Used by FileCache. Should files be locked before writing to them?
mask The mask used for created files
path Path to where cachefiles should be saved. Defaults to system's temp dir.
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 Should cache objects be serialized first.

[
    'duration' => 3600,
    'groups' => [],
    'isWindows' => false,
    'lock' => true,
    'mask' => 0664,
    'path' => null,
    'prefix' => 'cake_',
    'probability' => 100,
    'serialize' => true
]

$_initsource

protected boolean

True unless FileEngine::__active(); fails

true

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https://api.cakephp.org/3.4/class-Cake.Cache.Engine.FileEngine.html