src/Control/Middleware/HTTPCacheControlMiddleware.php
protected function applyChangeLevel($level, $force)
    {
        $forcingLevel = $level + ($force ? self::LEVEL_FORCED : 0);
        if ($forcingLevel < $this->getForcingLevel()) {
            return false;
        }
        $this->forcingLevel = $forcingLevel;
        return true;
    }
protected function applyChangeLevel($level, $force)
    {
        $forcingLevel = $level + ($force ? self::LEVEL_FORCED : 0);
        if ($forcingLevel < $this->getForcingLevel()) {
            return false;
        }
        $this->forcingLevel = $forcingLevel;
        return true;
    }
protected function applyChangeLevel ( $ level , $ force ) { $ forcingLevel = $ level + ( $ force ? self :: LEVEL_FORCED : 0 ) ; if ( $ forcingLevel < $ this -> getForcingLevel ( ) ) { return false ; } $ this -> forcingLevel = $ forcingLevel ; return true ; }
Instruct the cache to apply a change with a given level, optionally
modifying it with a force flag to increase priority of this action.

If the apply level was successful, the change is made and the internal level
threshold is incremented.

@param int $level Priority of the given change
@param bool $force If usercode has requested this action is forced to a higher priority.
Note: Even if $force is set to true, other higher-priority forced changes can still
cause a change to be rejected if it is below the required threshold.
@return bool True if the given change is accepted, and that the internal
level threshold is updated (if necessary) to the new minimum level.
Instruct the cache to apply a change with a given level optionally modifying it with a force flag to increase priority of this action .