__construct(iterable $expressions, ExpressionLanguage $expressionLanguage)

Parameters

iterable	$expressions
ExpressionLanguage	$expressionLanguage

bool isOptional()

Checks whether this warmer is optional or not.

Optional warmers can be ignored on certain conditions.

A warmer should return true if the cache can be generated incrementally and on-demand.

Return Value

bool	true if the warmer is optional, false otherwise

warmUp(string $cacheDir)

Warms up the cache.

Parameters

string

$cacheDir

The cache directory