/**
* Creates the cache ID for a renderable element.
*
* Creates the cache ID string based on #cache['keys'] + #cache['contexts'].
*
* @param array $elements
* A renderable array.
*
* @return string
* The cache ID string, or FALSE if the element may not be cached.
*/
protected function createCacheID(array $elements)
{
// If the maximum age is zero, then caching is effectively prohibited.
if (isset($elements['#cache']['max-age']) && $elements['#cache']['max-age'] === 0) {
return FALSE;
}
if (isset($elements['#cache']['keys'])) {
$cid_parts = $elements['#cache']['keys'];
if (!empty($elements['#cache']['contexts'])) {
$contexts = $this->cacheContextsManager->convertTokensToKeys($elements['#cache']['contexts']);
$cid_parts = array_merge($cid_parts, $contexts);
}
return implode(':', $cid_parts);
}
return FALSE;
}
/**
* @covers ::convertTokensToKeys
*
* @expectedException \Exception
*
* @dataProvider providerTestInvalidCalculatedContext
*/
public function testInvalidCalculatedContext($context_token)
{
$container = $this->getMockContainer();
$cache_contexts_manager = new CacheContextsManager($container, $this->getContextsFixture());
$cache_contexts_manager->convertTokensToKeys([$context_token]);
}