private function _gen_zk_node()
{
$node_frame = new MetaNode();
$val = array('val' => 'unit test');
$node_value = $node_frame->serialize($val);
$bad_node = pack("C2S1L1", 0, 64, 0, 0);
return array('good' => $node_value, 'bad' => $bad_node);
}
/**
* 更新一个meta entry的值
* @param string $entry_path : 节点相对路径（相对于meta）
* @param stdobject $value : stdclass格式的value
* @return node value array on success or false on failure
*/
public function update_entry($entry_path, &$new_value, $version)
{
if (false === $this->_inited) {
BigpipeLog::warning("[%s:%u][%s][uninited]", __FILE__, __LINE__, __FUNCTION__);
return false;
}
if ($version < 0) {
// zookeeper中version == -1表示强制更新节点
// 这里我们不允许有这种操作
BigpipeLog::warning("[%s:%u][%s][invalid version][ver:%d]", __FILE__, __LINE__, __FUNCTION__, $version);
return false;
}
$full_path = sprintf('%s/meta/%s', $this->_root_path, $entry_path);
if (false === $this->_zk_connection->exists($full_path)) {
BigpipeLog::warning("[%s:%u][%s][fail to find node under meta][node path:%s]", __FILE__, __LINE__, __FUNCTION__, $full_path);
return false;
}
// serialize value
$frame = new MetaNode();
$node_value = $frame->serialize($new_value);
if (false === $node_value) {
BigpipeLog::warning("[%s:%u][%s][fail to serialize value][path:%s]", __FILE__, __LINE__, __FUNCTION__, $full_path);
return false;
}
// update value in node
if (false === $this->_zk_connection->update($full_path, $node_value, $version)) {
BigpipeLog::warning("[%s:%u][%s][fail to upddate value][path:%s]", __FILE__, __LINE__, __FUNCTION__, $full_path);
return false;
}
BigpipeLog::notice("[%s:%u][%s][update value in a node][path:%s]", __FILE__, __LINE__, __FUNCTION__, $full_path);
return true;
}