Uses of Interface
org.apache.zookeeper.Watcher

Packages that use Watcher

Package	Description
org.apache.zookeeper
org.apache.zookeeper.admin
org.apache.zookeeper.server	ZooKeeper server theory of operation
org.apache.zookeeper.server.controller
org.apache.zookeeper.server.watch

Uses of Watcher in org.apache.zookeeper

Methods in org.apache.zookeeper that return types with arguments of type Watcher

Modifier and Type	Method	Description
protected abstract Map<String,Set<Watcher>>	ZooKeeper.WatchRegistration.getWatches(int rc)
Set<Watcher>	ClientWatchManager.materialize(Watcher.Event.KeeperState state, Watcher.Event.EventType type, String path)	Return a set of watchers that should be notified of the event.
Map<Watcher.Event.EventType,Set<Watcher>>	WatchDeregistration.unregister(int rc)	Unregistering watcher that was added on path.

Methods in org.apache.zookeeper with parameters of type Watcher

Modifier and Type	Method	Description
void	ZooKeeper.addWatch(String basePath, Watcher watcher, AddWatchMode mode)	Add a watch to the given znode using the given mode.
void	ZooKeeper.addWatch(String basePath, Watcher watcher, AddWatchMode mode, AsyncCallback.VoidCallback cb, Object ctx)	Async version of ZooKeeper.addWatch(String, Watcher, AddWatchMode) (see it for details)
Stat	ZooKeeper.exists(String path, Watcher watcher)	Return the stat of the node of the given path.
void	ZooKeeper.exists(String path, Watcher watcher, AsyncCallback.StatCallback cb, Object ctx)	The asynchronous version of exists.
List<String>	ZooKeeper.getChildren(String path, Watcher watcher)	Return the list of the children of the node of the given path.
void	ZooKeeper.getChildren(String path, Watcher watcher, AsyncCallback.Children2Callback cb, Object ctx)	The asynchronous version of getChildren.
void	ZooKeeper.getChildren(String path, Watcher watcher, AsyncCallback.ChildrenCallback cb, Object ctx)	The asynchronous version of getChildren.
List<String>	ZooKeeper.getChildren(String path, Watcher watcher, Stat stat)	For the given znode path return the stat and children list.
void	ZooKeeper.getConfig(Watcher watcher, AsyncCallback.DataCallback cb, Object ctx)	The asynchronous version of getConfig.
byte[]	ZooKeeper.getConfig(Watcher watcher, Stat stat)	Return the last committed configuration (as known to the server to which the client is connected) and the stat of the configuration.
void	ZooKeeper.getData(String path, Watcher watcher, AsyncCallback.DataCallback cb, Object ctx)	The asynchronous version of getData.
byte[]	ZooKeeper.getData(String path, Watcher watcher, Stat stat)	Return the data and the stat of the node of the given path.
void	ZooKeeper.register(Watcher watcher)	Specify the default watcher for the connection (overrides the one specified during construction).
void	ZooKeeper.removeWatches(String path, Watcher watcher, Watcher.WatcherType watcherType, boolean local)	For the given znode path, removes the specified watcher of given watcherType.
void	ZooKeeper.removeWatches(String path, Watcher watcher, Watcher.WatcherType watcherType, boolean local, AsyncCallback.VoidCallback cb, Object ctx)	The asynchronous version of removeWatches.

Constructors in org.apache.zookeeper with parameters of type Watcher

Constructor	Description
ClientCnxn(String chrootPath, HostProvider hostProvider, int sessionTimeout, ZKClientConfig clientConfig, Watcher defaultWatcher, org.apache.zookeeper.ClientCnxnSocket clientCnxnSocket, boolean canBeReadOnly)	Creates a connection object.
ClientCnxn(String chrootPath, HostProvider hostProvider, int sessionTimeout, ZKClientConfig clientConfig, Watcher defaultWatcher, org.apache.zookeeper.ClientCnxnSocket clientCnxnSocket, long sessionId, byte[] sessionPasswd, boolean canBeReadOnly)	Creates a connection object.
WatchDeregistration(String clientPath, Watcher watcher, Watcher.WatcherType watcherType, boolean local, org.apache.zookeeper.ZKWatchManager zkManager)
WatchRegistration(Watcher watcher, String clientPath)
ZooKeeper(String connectString, int sessionTimeout, Watcher watcher)	To create a ZooKeeper client object, the application needs to pass a connection string containing a comma separated list of host:port pairs, each corresponding to a ZooKeeper server.
ZooKeeper(String connectString, int sessionTimeout, Watcher watcher, boolean canBeReadOnly)	To create a ZooKeeper client object, the application needs to pass a connection string containing a comma separated list of host:port pairs, each corresponding to a ZooKeeper server.
ZooKeeper(String connectString, int sessionTimeout, Watcher watcher, boolean canBeReadOnly, HostProvider aHostProvider)	To create a ZooKeeper client object, the application needs to pass a connection string containing a comma separated list of host:port pairs, each corresponding to a ZooKeeper server.
ZooKeeper(String connectString, int sessionTimeout, Watcher watcher, boolean canBeReadOnly, HostProvider hostProvider, ZKClientConfig clientConfig)	To create a ZooKeeper client object, the application needs to pass a connection string containing a comma separated list of host:port pairs, each corresponding to a ZooKeeper server.
ZooKeeper(String connectString, int sessionTimeout, Watcher watcher, boolean canBeReadOnly, ZKClientConfig conf)	To create a ZooKeeper client object, the application needs to pass a connection string containing a comma separated list of host:port pairs, each corresponding to a ZooKeeper server.
ZooKeeper(String connectString, int sessionTimeout, Watcher watcher, long sessionId, byte[] sessionPasswd)	To create a ZooKeeper client object, the application needs to pass a connection string containing a comma separated list of host:port pairs, each corresponding to a ZooKeeper server.
ZooKeeper(String connectString, int sessionTimeout, Watcher watcher, long sessionId, byte[] sessionPasswd, boolean canBeReadOnly)	To create a ZooKeeper client object, the application needs to pass a connection string containing a comma separated list of host:port pairs, each corresponding to a ZooKeeper server.
ZooKeeper(String connectString, int sessionTimeout, Watcher watcher, long sessionId, byte[] sessionPasswd, boolean canBeReadOnly, HostProvider aHostProvider)	To create a ZooKeeper client object, the application needs to pass a connection string containing a comma separated list of host:port pairs, each corresponding to a ZooKeeper server.
ZooKeeper(String connectString, int sessionTimeout, Watcher watcher, long sessionId, byte[] sessionPasswd, boolean canBeReadOnly, HostProvider hostProvider, ZKClientConfig clientConfig)	To create a ZooKeeper client object, the application needs to pass a connection string containing a comma separated list of host:port pairs, each corresponding to a ZooKeeper server.
ZooKeeper(String connectString, int sessionTimeout, Watcher watcher, ZKClientConfig conf)	To create a ZooKeeper client object, the application needs to pass a connection string containing a comma separated list of host:port pairs, each corresponding to a ZooKeeper server.

Uses of Watcher in org.apache.zookeeper.admin

Constructors in org.apache.zookeeper.admin with parameters of type Watcher

Constructor	Description
ZooKeeperAdmin(String connectString, int sessionTimeout, Watcher watcher)	Create a ZooKeeperAdmin object which is used to perform dynamic reconfiguration operations.
ZooKeeperAdmin(String connectString, int sessionTimeout, Watcher watcher, boolean canBeReadOnly)	Create a ZooKeeperAdmin object which is used to perform dynamic reconfiguration operations.
ZooKeeperAdmin(String connectString, int sessionTimeout, Watcher watcher, boolean canBeReadOnly, ZKClientConfig conf)	Create a ZooKeeperAdmin object which is used to perform dynamic reconfiguration operations.
ZooKeeperAdmin(String connectString, int sessionTimeout, Watcher watcher, ZKClientConfig conf)	Create a ZooKeeperAdmin object which is used to perform dynamic reconfiguration operations.

Uses of Watcher in org.apache.zookeeper.server

Classes in org.apache.zookeeper.server that implement Watcher

Modifier and Type	Class	Description
class	DumbWatcher	A empty watcher implementation used in bench and unit test.
class	NettyServerCnxn
class	NIOServerCnxn	This class handles communication with clients using NIO.
class	ServerCnxn	Interface to a Server connection - represents a connection from a client to the server.

Methods in org.apache.zookeeper.server with parameters of type Watcher

Modifier and Type	Method	Description
void	DataTree.addWatch(String basePath, Watcher watcher, int mode)
void	ZKDatabase.addWatch(String basePath, Watcher watcher, int mode)	Add a watch
boolean	DataTree.containsWatcher(String path, Watcher.WatcherType type, Watcher watcher)
boolean	ZKDatabase.containsWatcher(String path, Watcher.WatcherType type, Watcher watcher)	Check whether the given watcher exists in datatree
List<String>	DataTree.getChildren(String path, Stat stat, Watcher watcher)
List<String>	ZKDatabase.getChildren(String path, Stat stat, Watcher watcher)	get children list for this path
byte[]	DataTree.getData(String path, Stat stat, Watcher watcher)
byte[]	ZKDatabase.getData(String path, Stat stat, Watcher watcher)	get data and stat for a path
void	DataTree.removeCnxn(Watcher watcher)
boolean	DataTree.removeWatch(String path, Watcher.WatcherType type, Watcher watcher)
boolean	ZKDatabase.removeWatch(String path, Watcher.WatcherType type, Watcher watcher)	Remove watch from the datatree
void	DataTree.setWatches(long relativeZxid, List<String> dataWatches, List<String> existWatches, List<String> childWatches, List<String> persistentWatches, List<String> persistentRecursiveWatches, Watcher watcher)
void	ZKDatabase.setWatches(long relativeZxid, List<String> dataWatches, List<String> existWatches, List<String> childWatches, List<String> persistentWatches, List<String> persistentRecursiveWatches, Watcher watcher)	set watches on the datatree
Stat	DataTree.statNode(String path, Watcher watcher)

Uses of Watcher in org.apache.zookeeper.server.controller

Classes in org.apache.zookeeper.server.controller that implement Watcher

Modifier and Type	Class	Description
class	ControllableConnection	Extension of NIOServerCnxn which can inject changes per controller commands.

Uses of Watcher in org.apache.zookeeper.server.watch

Methods in org.apache.zookeeper.server.watch that return types with arguments of type Watcher

Modifier and Type	Method	Description
Map<Watcher,Set<String>>	WatchManagerOptimized.getWatcher2PathesMap()	May cause OOM if there are lots of watches, might better to forbid it in this class.

Methods in org.apache.zookeeper.server.watch with parameters of type Watcher

Modifier and Type	Method	Description
boolean	IWatchManager.addWatch(String path, Watcher watcher)	Add watch to specific path.
default boolean	IWatchManager.addWatch(String path, Watcher watcher, WatcherMode watcherMode)	Add watch to specific path.
boolean	WatchManager.addWatch(String path, Watcher watcher)
boolean	WatchManager.addWatch(String path, Watcher watcher, WatcherMode watcherMode)
boolean	WatchManagerOptimized.addWatch(String path, Watcher watcher)
boolean	WatcherOrBitSet.contains(Watcher watcher)
boolean	IWatchManager.containsWatcher(String path, Watcher watcher)	Checks the specified watcher exists for the given path.
boolean	WatchManager.containsWatcher(String path, Watcher watcher)
boolean	WatchManagerOptimized.containsWatcher(String path, Watcher watcher)	Used in the OpCode.checkWatches, which is a read operation, since read and write requests are exclusively processed, we don't need to hold lock here.
boolean	IWatchManager.removeWatcher(String path, Watcher watcher)	Removes the specified watcher for the given path.
void	IWatchManager.removeWatcher(Watcher watcher)	The entry to remove the watcher when the cnxn is closed.
boolean	WatchManager.removeWatcher(String path, Watcher watcher)
void	WatchManager.removeWatcher(Watcher watcher)
boolean	WatchManagerOptimized.removeWatcher(String path, Watcher watcher)
void	WatchManagerOptimized.removeWatcher(Watcher watcher)

Constructor parameters in org.apache.zookeeper.server.watch with type arguments of type Watcher

Constructor	Description
WatcherOrBitSet(Set<Watcher> watchers)