org.apache.hadoop.hbase.zookeeper

类 DeletionListener

java.lang.Object

org.apache.hadoop.hbase.zookeeper.ZKListener

org.apache.hadoop.hbase.zookeeper.DeletionListener

@InterfaceAudience.Private
public class DeletionListener
extends ZKListener

A ZooKeeper watcher meant to detect deletions of ZNodes.

字段概要

从类继承的字段 org.apache.hadoop.hbase.zookeeper.ZKListener

watcher

构造器概要

构造器

构造器和说明
DeletionListener(ZKWatcher zkWatcher, String pathToWatch, CountDownLatch deletedLatch) Create a new instance of the deletion watcher.

方法概要

限定符和类型	方法和说明
Throwable	getException() Get the last exception which has occurred when re-setting the watch.
boolean	hasException() Check if an exception has occurred when re-setting the watch.
void	nodeDataChanged(String path) Called when an existing node has changed data.
void	nodeDeleted(String path) Called when a node has been deleted

从类继承的方法 org.apache.hadoop.hbase.zookeeper.ZKListener

getWatcher, nodeChildrenChanged, nodeCreated

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

构造器详细资料

DeletionListener

public DeletionListener(ZKWatcher zkWatcher,
                        String pathToWatch,
                        CountDownLatch deletedLatch)

Create a new instance of the deletion watcher.

参数:

zkWatcher - ZookeeperWatcher instance

pathToWatch - (Fully qualified) ZNode path that we are waiting to be deleted.

deletedLatch - Count down on this latch when deletion has occurred.

方法详细资料

hasException

public boolean hasException()

Check if an exception has occurred when re-setting the watch.

返回:

True if we were unable to re-set a watch on a ZNode due to an exception.

getException

public Throwable getException()

Get the last exception which has occurred when re-setting the watch. Use hasException() to check whether or not an exception has occurred.

返回:

The last exception observed when re-setting the watch.

nodeDataChanged

public void nodeDataChanged(String path)

从类复制的说明: ZKListener

Called when an existing node has changed data.

覆盖:

nodeDataChanged 在类中 ZKListener

参数:

path - full path of the updated node

nodeDeleted

public void nodeDeleted(String path)

从类复制的说明: ZKListener

Called when a node has been deleted

覆盖:

nodeDeleted 在类中 ZKListener

参数:

path - full path of the deleted node