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

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

Method Summary

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

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