/// <summary>
/// For the given znode path return the stat and children list.
///
/// If the watch is non-null and the call is successful (no exception is thrown),
/// a watch will be left on the node with the given path. The watch willbe
/// triggered by a successful operation that deletes the node of the given
/// path or creates/delete a child under the node.
///
/// The list of children returned is not sorted and no guarantee is provided
/// as to its natural or lexical order.
///
/// A KeeperException with error code KeeperException.NoNode will be thrown
/// if no node with the given path exists.
/// @since 3.3.0
///
/// @param path
/// @param watcher explicit watcher
/// @param stat stat of the znode designated by path
/// @return an unordered array of children of the node with the given path
/// @throws InterruptedException If the server transaction is interrupted.
/// @throws KeeperException If the server signals an error with a non-zero error code.
/// @throws IllegalArgumentException if an invalid path is specified
/// </summary>
public IEnumerable <string> GetChildren(string path, IWatcher watcher, Stat stat)
{
string clientPath = path;
PathUtils.ValidatePath(clientPath);
// the watch contains the un-chroot path
WatchRegistration wcb = null;
if (watcher != null)
{
wcb = new ChildWatchRegistration(watchManager, watcher, clientPath);
}
string serverPath = PrependChroot(clientPath);
RequestHeader h = new RequestHeader();
h.Type = (int)OpCode.GetChildren2;
GetChildren2Request request = new GetChildren2Request(serverPath, watcher != null);
GetChildren2Response response = new GetChildren2Response();
ReplyHeader r = cnxn.SubmitRequest(h, request, response, wcb);
if (r.Err != 0)
{
throw KeeperException.Create((KeeperException.Code)Enum.ToObject(typeof(KeeperException.Code), r.Err), clientPath);
}
if (stat != null)
{
DataTree.CopyStat(response.Stat, stat);
}
return(response.Children);
}
/// <summary>
/// Return the stat of the node of the given path. Return null if no such a
/// node exists.
///
/// If the watch is non-null and the call is successful (no exception is thrown),
/// a watch will be left on the node with the given path. The watch will be
/// triggered by a successful operation that creates/delete the node or sets
/// the data on the node.
/// </summary>
/// <param name="path">The path.</param>
/// <param name="watcher">The watcher.</param>
/// <returns>the stat of the node of the given path; return null if no such a node exists.</returns>
public Stat Exists(string path, IWatcher watcher)
{
string clientPath = path;
PathUtils.ValidatePath(clientPath);
// the watch contains the un-chroot path
WatchRegistration wcb = null;
if (watcher != null)
{
wcb = new ExistsWatchRegistration(watchManager, watcher, clientPath);
}
string serverPath = PrependChroot(clientPath);
RequestHeader h = new RequestHeader();
h.Type = (int)OpCode.Exists;
ExistsRequest request = new ExistsRequest(serverPath, watcher != null);
SetDataResponse response = new SetDataResponse();
ReplyHeader r = cnxn.SubmitRequest(h, request, response, wcb);
if (r.Err != 0)
{
if (r.Err == (int)KeeperException.Code.NONODE)
{
return(null);
}
throw KeeperException.Create((KeeperException.Code)Enum.ToObject(typeof(KeeperException.Code), r.Err), clientPath);
}
return(response.Stat.Czxid == -1 ? null : response.Stat);
}
internal Packet(RequestHeader header, ReplyHeader replyHeader, IRecord request, IRecord response, byte[] data, WatchRegistration watchRegistration, string serverPath, string clientPath)
{
this.header = header;
this.replyHeader = replyHeader;
this.request = request;
this.response = response;
this.serverPath = serverPath;
this.clientPath = clientPath;
if (data != null)
{
this.data = data;
}
else
{
try
{
MemoryStream ms = new MemoryStream();
using (EndianBinaryWriter writer = new EndianBinaryWriter(EndianBitConverter.Big, ms, Encoding.UTF8))
{
BinaryOutputArchive boa = BinaryOutputArchive.getArchive(writer);
boa.WriteInt(-1, "len"); // We'll fill this in later
if (header != null)
{
header.Serialize(boa, "header");
}
if (request != null)
{
request.Serialize(boa, "request");
}
ms.Position = 0;
int len = Convert.ToInt32(ms.Length); // now we have the real length
writer.Write(len - 4); // update the length info
this.data = ms.ToArray();
}
}
catch (IOException e)
{
log.Warn("Ignoring unexpected exception", e);
}
}
this.watchRegistration = watchRegistration;
}
/// <summary>
///
/// </summary>
/// <param name="h"></param>
/// <param name="r"></param>
/// <param name="request"></param>
/// <param name="response"></param>
/// <param name="clientPath"></param>
/// <param name="serverPath"></param>
/// <param name="watchRegistration"></param>
/// <param name="callback"></param>
/// <param name="ctx"></param>
/// <returns></returns>
public Packet QueuePacket(RequestHeader h, ReplyHeader r, IRecord request, IRecord response, string clientPath, string serverPath, WatchRegistration watchRegistration, object callback, object ctx)
{
return(producer.QueuePacket(h, r, request, response, clientPath, serverPath, watchRegistration));
}
/// <summary>
///
/// </summary>
/// <param name="h"></param>
/// <param name="request"></param>
/// <param name="response"></param>
/// <param name="watchRegistration"></param>
/// <returns></returns>
public ReplyHeader SubmitRequest(RequestHeader h, IRecord request, IRecord response, WatchRegistration watchRegistration)
{
ReplyHeader r = new ReplyHeader();
Packet p = QueuePacket(h, r, request, response, null, null, watchRegistration, null, null);
if (!p.WaitUntilFinishedSlim(SessionTimeout))
{
throw new TimeoutException(new StringBuilder("The request ").Append(request).Append(" timed out while waiting for a response from the server.").ToString());
}
return(r);
}
/// <summary>
///
/// </summary>
/// <param name="h"></param>
/// <param name="r"></param>
/// <param name="request"></param>
/// <param name="response"></param>
/// <param name="clientPath"></param>
/// <param name="serverPath"></param>
/// <param name="watchRegistration"></param>
/// <returns></returns>
public Packet QueuePacket(RequestHeader h, ReplyHeader r, IRecord request, IRecord response, string clientPath, string serverPath, WatchRegistration watchRegistration)
{
if (h.Type != (int)OpCode.Ping && h.Type != (int)OpCode.Auth)
{
h.Xid = Xid;
}
Packet p = new Packet(h, r, request, response, null, watchRegistration, clientPath, serverPath);
if (!zooKeeper.State.IsAlive() || closing || Interlocked.CompareExchange(ref isDisposed, 0, 0) == 1)
{
if (log.IsDebugEnabled)
{
log.DebugFormat("Connection closing. Sending ConLossPacket. IsAlive: {0}, closing: {1}", zooKeeper.State.IsAlive(), closing);
}
ConLossPacket(p);
}
else
{
if (h.Type == (int)OpCode.CloseSession)
{
closing = true;
}
addPacketLast(p);
}
return(p);
}
