1. class
  2. Neos
  3. \
  4. Cache
  5. \
  6. Backend
  7. \
  8. NullBackend

NullBackend

class NullBackend extends AbstractBackend implements PhpCapableBackendInterface, TaggableBackendInterface (View source)

A caching backend which forgets everything immediately

Constants

DATETIME_EXPIRYTIME_UNLIMITED

UNLIMITED_LIFETIME

Properties

protected FrontendInterface $cache

Reference to the cache frontend which uses this backend

 from  AbstractBackend
protected string $cacheIdentifier from  AbstractBackend
protected string $identifierPrefix

A prefix to seperate stored by appliaction context and cache

 from  AbstractBackend
protected int $defaultLifetime

Default lifetime of a cache entry in seconds

 from  AbstractBackend
protected EnvironmentConfiguration $environmentConfiguration from  AbstractBackend

Methods

__construct(EnvironmentConfiguration $environmentConfiguration = null, array $options = [])

Constructs this backend

from  AbstractBackend
void
setProperties(array $properties, bool $throwExceptionIfPropertyNotSettable = true)

No description

from  AbstractBackend
bool
setProperty(string $propertyName, mixed $propertyValue)

Successfully ignore every configured property

void
setCache(FrontendInterface $cache)

Sets a reference to the cache frontend which uses this backend

from  AbstractBackend
void
setDefaultLifetime(int|string $defaultLifetime)

Sets the default lifetime for this cache backend

from  AbstractBackend
DateTime
calculateExpiryTime(int $lifetime = null)

Calculates the expiry time by the given lifetime. If no lifetime is specified, the default lifetime is used.

from  AbstractBackend
string
getPrefixedIdentifier(string $entryIdentifier)

Returns the internally used, prefixed entry identifier for the given public entry identifier.

from  AbstractBackend
void
set(string $entryIdentifier, string $data, array $tags = [], int $lifetime = null)

Acts as if it would save data

mixed
get(string $entryIdentifier)

Returns False

bool
has(string $entryIdentifier)

Returns False

bool
remove(string $entryIdentifier)

Does nothing

array
findIdentifiersByTag(string $tag)

Returns an empty array

void
flush()

Does nothing

int
flushByTag(string $tag)

Does nothing

void
collectGarbage()

Does nothing

mixed
requireOnce(string $identifier)

Does nothing

Details

in AbstractBackend at line 64
__construct(EnvironmentConfiguration $environmentConfiguration = null, array $options = [])

Constructs this backend

Parameters

EnvironmentConfiguration $environmentConfiguration
array $options

Configuration options - depends on the actual backend

in AbstractBackend at line 79
protected void setProperties(array $properties, bool $throwExceptionIfPropertyNotSettable = true)

No description

Parameters

array $properties
bool $throwExceptionIfPropertyNotSettable

Return Value

void

Exceptions

InvalidArgumentException

at line 34
protected bool setProperty(string $propertyName, mixed $propertyValue)

Successfully ignore every configured property

Parameters

string $propertyName
mixed $propertyValue

Return Value

bool

in AbstractBackend at line 116
void setCache(FrontendInterface $cache)

Sets a reference to the cache frontend which uses this backend

Parameters

FrontendInterface $cache

The frontend for this backend

Return Value

void

in AbstractBackend at line 132
void setDefaultLifetime(int|string $defaultLifetime)

Sets the default lifetime for this cache backend

Parameters

int|string $defaultLifetime

Default lifetime of this cache backend in seconds. 0 means unlimited lifetime.

Return Value

void

Exceptions

InvalidArgumentException

in AbstractBackend at line 147
protected DateTime calculateExpiryTime(int $lifetime = null)

Calculates the expiry time by the given lifetime. If no lifetime is specified, the default lifetime is used.

Parameters

int $lifetime

The lifetime in seconds

Return Value

DateTime

The expiry time

in AbstractBackend at line 175
string getPrefixedIdentifier(string $entryIdentifier)

Returns the internally used, prefixed entry identifier for the given public entry identifier.

While Flow applications will mostly refer to the simple entry identifier, it may be necessary to know the actual identifier used by the cache backend in order to share cache entries with other applications. This method allows for retrieving it.

Note that, in case of the AbstractBackend, this method is returns just the given entry identifier.

Parameters

string $entryIdentifier

Return Value

string

at line 49
void set(string $entryIdentifier, string $data, array $tags = [], int $lifetime = null)

Acts as if it would save data

Parameters

string $entryIdentifier

An identifier for this specific cache entry
string $data

The data to be stored
array $tags

Tags to associate with this cache entry. If the backend does not support tags, this option can be ignored.
int $lifetime

Lifetime of this cache entry in seconds. If NULL is specified, the default lifetime is used. "0" means unlimited lifetime.

Return Value

void

at line 60
mixed get(string $entryIdentifier)

Returns False

Parameters

string $entryIdentifier

An identifier which describes the cache entry to load

Return Value

mixed

The cache entry's content as a string or false if the cache entry could not be loaded

at line 72
bool has(string $entryIdentifier)

Returns False

Parameters

string $entryIdentifier

An identifier specifying the cache entry

Return Value

bool

true if such an entry exists, false if not

at line 84
bool remove(string $entryIdentifier)

Does nothing

Parameters

string $entryIdentifier

Specifies the cache entry to remove

Return Value

bool

true if (at least) an entry could be removed or false if no entry was found

at line 96
array findIdentifiersByTag(string $tag)

Returns an empty array

Parameters

string $tag

The tag to search for

Return Value

array

An array with identifiers of all matching entries. An empty array if no entries matched

at line 107
void flush()

Does nothing

Return Value

void

at line 118
int flushByTag(string $tag)

Does nothing

Parameters

string $tag

The tag the entries must have

Return Value

int

The number of entries which have been affected by this flush or NULL if the number is unknown

at line 129
void collectGarbage()

Does nothing

Return Value

void

at line 140
mixed requireOnce(string $identifier)

Does nothing

Parameters

string $identifier

An identifier which describes the cache entry to load

Return Value

mixed

Potential return value from the include operation