org.apache.hadoop.hbase.zookeeper

Class DeletionListener

java.lang.Object

org.apache.hadoop.hbase.zookeeper.ZooKeeperListener

org.apache.hadoop.hbase.zookeeper.DeletionListener

@InterfaceAudience.Private
public class DeletionListener
extends ZooKeeperListener

A ZooKeeper watcher meant to detect deletions of ZNodes.

Field Summary

Fields inherited from class org.apache.hadoop.hbase.zookeeper.ZooKeeperListener

watcher

Constructor Summary

Constructors

Constructor and Description
DeletionListener(ZooKeeperWatcher zkWatcher, String pathToWatch, CountDownLatch deletedLatch) Create a new instance of the deletion watcher.

Method Summary

Methods

Modifier and Type	Method and Description
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)
void	nodeDeleted(String path)

Methods inherited from class org.apache.hadoop.hbase.zookeeper.ZooKeeperListener

getWatcher, nodeChildrenChanged, nodeCreated

Methods inherited from class java.lang.Object

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

Constructor Detail

DeletionListener

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

Create a new instance of the deletion watcher.

Parameters:

zkWatcher - ZookeeperWatcher instance

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

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

Method Detail

hasException

public boolean hasException()

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

Returns:

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.

Returns:

The last exception observed when re-setting the watch.

nodeDataChanged

public void nodeDataChanged(String path)

Overrides:

nodeDataChanged in class ZooKeeperListener

nodeDeleted

public void nodeDeleted(String path)

Overrides:

nodeDeleted in class ZooKeeperListener