/// <summary>
/// Set the ACL for the node of the given path if such a node exists and the
/// given version matches the version of the node. Return the stat of the
/// node.
///
/// A KeeperException with error code KeeperException.NoNode will be thrown
/// if no node with the given path exists.
///
/// A KeeperException with error code KeeperException.BadVersion will be
/// thrown if the given version does not match the node's version.
/// @param path
/// @param acl
/// @param version
/// @return the stat of the node.
/// @throws InterruptedException If the server transaction is interrupted.
/// @throws KeeperException If the server signals an error with a non-zero error code.
/// @throws org.apache.zookeeper.KeeperException.InvalidACLException If the acl is invalide.
/// @throws IllegalArgumentException if an invalid path is specified
/// </summary>
public Stat SetACL(string path, IEnumerable <ACL> acl, int version)
{
string clientPath = path;
PathUtils.ValidatePath(clientPath);
if (acl != null && acl.Count() == 0)
{
throw new KeeperException.InvalidACLException();
}
string serverPath = PrependChroot(clientPath);
RequestHeader h = new RequestHeader();
h.Type = (int)OpCode.SetACL;
SetACLRequest request = new SetACLRequest(serverPath, acl, version);
SetACLResponse response = new SetACLResponse();
ReplyHeader r = cnxn.SubmitRequest(h, request, response, null);
if (r.Err != 0)
{
throw KeeperException.Create((KeeperException.Code)Enum.ToObject(typeof(KeeperException.Code), r.Err), clientPath);
}
return(response.Stat);
}
/**
* All non-specific keeper exceptions should be constructed via
* this factory method in order to guarantee consistency in error
* codes and such. If you know the error code, then you should
* construct the special purpose exception directly. That will
* allow you to have the most specific possible declarations of
* what exceptions might actually be thrown.
*
* @param code The error code.
* @param path The ZooKeeper path being operated on.
* @return The specialized exception, presumably to be thrown by
* the caller.
*/
public static KeeperException Create(Code code, string path)
{
KeeperException r = Create(code);
r.path = path;
return(r);
}
/// <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);
}
/// <summary>
/// Delete the node with the given path. The call will succeed if such a node
/// exists, and the given version matches the node's version (if the given
/// version is -1, it matches any node's versions).
///
/// A KeeperException with error code KeeperException.NoNode will be thrown
/// if the nodes does not exist.
///
/// A KeeperException with error code KeeperException.BadVersion will be
/// thrown if the given version does not match the node's version.
///
/// A KeeperException with error code KeeperException.NotEmpty will be thrown
/// if the node has children.
///
/// This operation, if successful, will trigger all the watches on the node
/// of the given path left by exists API calls, and the watches on the parent
/// node left by getChildren API calls.
/// </summary>
/// <param name="path">The path.</param>
/// <param name="version">The version.</param>
public void Delete(string path, int version)
{
string clientPath = path;
PathUtils.ValidatePath(clientPath);
string serverPath;
// maintain semantics even in chroot case
// specifically - root cannot be deleted
// I think this makes sense even in chroot case.
if (clientPath.Equals(PathUtils.PathSeparator))
{
// a bit of a hack, but delete(/) will never succeed and ensures
// that the same semantics are maintained
serverPath = clientPath;
}
else
{
serverPath = PrependChroot(clientPath);
}
RequestHeader h = new RequestHeader();
h.Type = (int)OpCode.Delete;
DeleteRequest request = new DeleteRequest(serverPath, version);
ReplyHeader r = cnxn.SubmitRequest(h, request, null, null);
if (r.Err != 0)
{
throw KeeperException.Create((KeeperException.Code)Enum.ToObject(typeof(KeeperException.Code), r.Err), clientPath);
}
}
/// <summary>
/// Create a node with the given path. The node data will be the given data,
/// and node acl will be the given acl.
///
/// The flags argument specifies whether the created node will be ephemeral
/// or not.
///
/// An ephemeral node will be removed by the ZooKeeper automatically when the
/// session associated with the creation of the node expires.
///
/// The flags argument can also specify to create a sequential node. The
/// actual path name of a sequential node will be the given path plus a
/// suffix "i" where i is the current sequential number of the node. The sequence
/// number is always fixed length of 10 digits, 0 padded. Once
/// such a node is created, the sequential number will be incremented by one.
///
/// If a node with the same actual path already exists in the ZooKeeper, a
/// KeeperException with error code KeeperException.NodeExists will be
/// thrown. Note that since a different actual path is used for each
/// invocation of creating sequential node with the same path argument, the
/// call will never throw "file exists" KeeperException.
///
/// If the parent node does not exist in the ZooKeeper, a KeeperException
/// with error code KeeperException.NoNode will be thrown.
///
/// An ephemeral node cannot have children. If the parent node of the given
/// path is ephemeral, a KeeperException with error code
/// KeeperException.NoChildrenForEphemerals will be thrown.
///
/// This operation, if successful, will trigger all the watches left on the
/// node of the given path by exists and getData API calls, and the watches
/// left on the parent node by getChildren API calls.
///
/// If a node is created successfully, the ZooKeeper server will trigger the
/// watches on the path left by exists calls, and the watches on the parent
/// of the node by getChildren calls.
///
/// The maximum allowable size of the data array is 1 MB (1,048,576 bytes).
/// Arrays larger than this will cause a KeeperExecption to be thrown.
/// </summary>
/// <param name="path">The path for the node.</param>
/// <param name="data">The data for the node.</param>
/// <param name="acl">The acl for the node.</param>
/// <param name="createMode">specifying whether the node to be created is ephemeral and/or sequential.</param>
/// <returns></returns>
public string Create(string path, byte[] data, IEnumerable <ACL> acl, CreateMode createMode)
{
string clientPath = path;
PathUtils.ValidatePath(clientPath, createMode.Sequential);
if (acl != null && acl.Count() == 0)
{
throw new KeeperException.InvalidACLException();
}
string serverPath = PrependChroot(clientPath);
RequestHeader h = new RequestHeader();
h.Type = (int)OpCode.Create;
CreateRequest request = new CreateRequest(serverPath, data, acl, createMode.Flag);
CreateResponse response = new CreateResponse();
ReplyHeader r = cnxn.SubmitRequest(h, request, response, null);
if (r.Err != 0)
{
throw KeeperException.Create((KeeperException.Code)Enum.ToObject(typeof(KeeperException.Code), r.Err), clientPath);
}
return(cnxn.ChrootPath == null ? response.Path : response.Path.Substring(cnxn.ChrootPath.Length));
}
/// <summary>
/// Set the data for the node of the given path if such a node exists and the
/// given version matches the version of the node (if the given version is
/// -1, it matches any node's versions). Return the stat of the node.
///
/// This operation, if successful, will trigger all the watches on the node
/// of the given path left by getData calls.
///
/// A KeeperException with error code KeeperException.NoNode will be thrown
/// if no node with the given path exists.
///
/// A KeeperException with error code KeeperException.BadVersion will be
/// thrown if the given version does not match the node's version.
///
/// The maximum allowable size of the data array is 1 MB (1,048,576 bytes).
/// Arrays larger than this will cause a KeeperExecption to be thrown.
/// @param path
/// the path of the node
/// @param data
/// the data to set
/// @param version
/// the expected matching version
/// @return the state of the node
/// @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 Stat SetData(string path, byte[] data, int version)
{
string clientPath = path;
PathUtils.ValidatePath(clientPath);
string serverPath = PrependChroot(clientPath);
RequestHeader h = new RequestHeader();
h.Type = (int)OpCode.SetData;
SetDataRequest request = new SetDataRequest(serverPath, data, version);
SetDataResponse response = new SetDataResponse();
ReplyHeader r = cnxn.SubmitRequest(h, request, response, null);
if (r.Err != 0)
{
throw KeeperException.Create((KeeperException.Code)Enum.ToObject(typeof(KeeperException.Code), r.Err), clientPath);
}
return(response.Stat);
}
/// <summary>
/// Return the ACL and stat of the node of the given path.
///
/// A KeeperException with error code KeeperException.NoNode will be thrown
/// if no node with the given path exists.
/// @param path
/// the given path for the node
/// @param stat
/// the stat of the node will be copied to this parameter.
/// @return the ACL array of the given node.
/// @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 <ACL> GetACL(string path, Stat stat)
{
string clientPath = path;
PathUtils.ValidatePath(clientPath);
string serverPath = PrependChroot(clientPath);
RequestHeader h = new RequestHeader();
h.Type = (int)OpCode.GetACL;
GetACLRequest request = new GetACLRequest(serverPath);
GetACLResponse response = new GetACLResponse();
ReplyHeader r = cnxn.SubmitRequest(h, request, response, null);
if (r.Err != 0)
{
throw KeeperException.Create((KeeperException.Code)Enum.ToObject(typeof(KeeperException.Code), r.Err), clientPath);
}
DataTree.CopyStat(response.Stat, stat);
return(response.Acl);
}
private void StartConnect()
{
zooKeeper.State = ZooKeeper.States.CONNECTING;
TcpClient tempClient = null;
WaitHandle wh = null;
do
{
if (zkEndpoints.EndPointID != -1)
{
try
{
Thread.Sleep(new TimeSpan(0, 0, 0, 0, random.Next(0, 50)));
}
catch (ThreadInterruptedException e1)
{
LOG.Warn("Unexpected exception", e1);
}
if (!zkEndpoints.IsNextEndPointAvailable)
{
try
{
// Try not to spin too fast!
Thread.Sleep(1000);
}
catch (ThreadInterruptedException e)
{
LOG.Warn("Unexpected exception", e);
}
}
}
//advance through available connections;
zkEndpoints.GetNextAvailableEndpoint();
Cleanup(tempClient);
LOG.InfoFormat("Opening socket connection to server {0}", zkEndpoints.CurrentEndPoint.ServerAddress);
tempClient = new TcpClient();
tempClient.LingerState = new LingerOption(false, 0);
tempClient.NoDelay = true;
Interlocked.Exchange(ref initialized, 0);
IsConnectionClosedByServer = false;
try
{
IAsyncResult ar = tempClient.BeginConnect(zkEndpoints.CurrentEndPoint.ServerAddress.Address,
zkEndpoints.CurrentEndPoint.ServerAddress.Port,
null,
null);
wh = ar.AsyncWaitHandle;
if (!ar.AsyncWaitHandle.WaitOne(conn.ConnectionTimeout, false))
{
Cleanup(tempClient);
tempClient = null;
throw new TimeoutException();
}
tempClient.EndConnect(ar);
zkEndpoints.CurrentEndPoint.SetAsSuccess();
break;
}
catch (Exception ex)
{
if (ex is SocketException || ex is TimeoutException)
{
Cleanup(tempClient);
tempClient = null;
zkEndpoints.CurrentEndPoint.SetAsFailure();
LOG.WarnFormat(string.Format("Failed to connect to {0}:{1}.",
zkEndpoints.CurrentEndPoint.ServerAddress.Address.ToString(),
zkEndpoints.CurrentEndPoint.ServerAddress.Port.ToString()));
}
else
{
throw;
}
}
finally
{
wh.Close();
}
}while (zkEndpoints.IsNextEndPointAvailable);
if (tempClient == null)
{
throw KeeperException.Create(KeeperException.Code.CONNECTIONLOSS);
}
client = tempClient;
client.GetStream().BeginRead(incomingBuffer, 0, incomingBuffer.Length, ReceiveAsynch, incomingBuffer);
PrimeConnection();
}