/**
* Open the cache for reading.
* @return MessageGroupCache
*/
protected function open()
{
if ($this->cache === null) {
$this->cache = CdbReader::open($this->getCacheFileName());
if ($this->cache->get('#version') !== '3') {
$this->close();
unlink($this->getCacheFileName());
}
}
return $this->cache;
}
/**
* Open the cache for reading.
* @return MessageGroupCache
*/
protected function open() {
if ( $this->cache === null ) {
$this->cache = CdbReader::open( $this->getCacheFileName() );
if ( $this->cache->get( '#version' ) !== '3' ) {
$this->updateCacheFormat( $this->cache );
$this->close();
return $this->open();
}
}
return $this->cache;
}