/**
* Initializes metadata.
*
* If metadata cannot be loaded from cache, adapter's describeTable() method is called to discover metadata
* information. Returns true if and only if the metadata are loaded from cache.
*
* @return boolean
* @throws \Micro\Database\Table\Exception
*/
protected function _setupMetadata()
{
if ($this->metadataCacheInClass() && !empty($this->_metadata)) {
return true;
}
// Assume that metadata will be loaded from cache
$isMetadataFromCache = true;
// If $this has no metadata cache but the class has a default metadata cache
if (null === $this->_metadataCache && null !== self::$_defaultMetadataCache) {
// Make $this use the default metadata cache of the class
$this->_setMetadataCache(self::$_defaultMetadataCache);
}
$cacheId = $this->_name;
// If $this has a metadata cache
if (null !== $this->_metadataCache) {
// Define the cache identifier where the metadata are saved
//get db configuration
$dbConfig = $this->_db->getConfig();
$port = isset($dbConfig['options']['port']) ? ':' . $dbConfig['options']['port'] : (isset($dbConfig['port']) ? ':' . $dbConfig['port'] : null);
$host = isset($dbConfig['options']['host']) ? ':' . $dbConfig['options']['host'] : (isset($dbConfig['host']) ? ':' . $dbConfig['host'] : null);
// Define the cache identifier where the metadata are saved
$cacheId = 'DB_' . $this->_name . '_' . md5($port . $host . '/' . $dbConfig['dbname'] . ':' . $this->_schema . '.' . $this->_name);
}
if ($this->_useSharedMetadata && isset(self::$_metadataExt[$cacheId])) {
$this->_metadata = self::$_metadataExt[$cacheId];
return true;
}
// If $this has no metadata cache or metadata cache misses
if (null === $this->_metadataCache || !($metadata = $this->_metadataCache->load($cacheId))) {
// Metadata are not loaded from cache
$isMetadataFromCache = false;
// Fetch metadata from the adapter's describeTable() method
$metadata = $this->_db->describeTable($this->_name, $this->_schema);
// If $this has a metadata cache, then cache the metadata
if (null !== $this->_metadataCache && !$this->_metadataCache->save($metadata, $cacheId)) {
trigger_error('Failed saving metadata to metadataCache', E_USER_NOTICE);
}
}
// Assign the metadata to $this
$this->_metadata = self::$_metadataExt[$cacheId] = $metadata;
// Return whether the metadata were loaded from cache
return $isMetadataFromCache;
}
