public static bool AmILeader(Server server)
{
try
{
bool result = helper.RetryOperation(() =>
{
IZooKeeper zookeeper = _zookeeper;
string shardLeaderPath = ZkPath.LeaderPath(ZkPath.CollectionName, server.ShardName);
Stat stat = zookeeper.Exists(shardLeaderPath, null);
if (stat == null)
{
throw new NotProcessLeaderElectionException(shardLeaderPath);
}
Server dataServer = getDataSever(shardLeaderPath);
if (dataServer == server)
{
return(true);
}
else
{
return(false);
}
});
return(result);
}
catch (KeeperException.SessionExpiredException ex)
{
helper.Dispose();
helper = new LeaderHelper(_zookeeper);
throw ex;
}
}
public static Server ShardLeader(string shardName)
{
IZooKeeper zookeeper = _zookeeper;
string shardLeaderPath = ZkPath.LeaderPath(ZkPath.CollectionName, shardName);
Stat stat = zookeeper.Exists(shardLeaderPath, null);
if (stat == null)
{
return(null);
}
Server dataServer = getDataSever(shardLeaderPath);
return(dataServer);
}
public static void CreateLeaderNode(string shardName, byte[] data)
{
try
{
helper.RetryOperation(() =>
{
string shardLeaderPath = ZkPath.LeaderPath(ZkPath.CollectionName, shardName);
helper.EnsureExists(shardLeaderPath, data, null, CreateMode.Persistent);
return(true);
});
}
catch (KeeperException.SessionExpiredException ex)
{
helper.Dispose();
helper = new LeaderHelper(_zookeeper);
throw ex;
}
}
