org.apache.pulsar.zookeeper

Class ZooKeeperDataCache<T>

java.lang.Object

org.apache.pulsar.zookeeper.ZooKeeperDataCache<T>

Type Parameters:

T -

All Implemented Interfaces:

ZooKeeperCache.CacheUpdater<T>, ZooKeeperCache.Deserializer<T>, Watcher

public abstract class ZooKeeperDataCache<T>
extends Object
implements ZooKeeperCache.Deserializer<T>, ZooKeeperCache.CacheUpdater<T>, Watcher

Provides a generic cache for reading objects stored in zookeeper. Maintains the objects already serialized in memory and sets watches to receive changes notifications.

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.zookeeper.Watcher

Watcher.Event, Watcher.WatcherType

Constructor Summary

Constructors

Constructor and Description
ZooKeeperDataCache(ZooKeeperCache cache)

Method Summary

Modifier and Type	Method and Description
void	clear() Only for UTs (for now), as this clears the whole ZK data cache.
void	close()
Optional<T>	get(String path) Return an item from the cache If node doens't exist, the value will be not present.s
CompletableFuture<Optional<T>>	getAsync(String path)
T	getDataIfPresent(String path)
Optional<Map.Entry<T,org.apache.zookeeper.data.Stat>>	getWithStat(String path)
CompletableFuture<Optional<Map.Entry<T,org.apache.zookeeper.data.Stat>>>	getWithStatAsync(String path)
void	invalidate(String path)
void	process(WatchedEvent event)
void	registerListener(ZooKeeperCacheListener<T> listener)
void	reloadCache(String path)
void	unregisterListener(ZooKeeperCacheListener<T> listener)

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.pulsar.zookeeper.ZooKeeperCache.Deserializer

deserialize

Constructor Detail

ZooKeeperDataCache

public ZooKeeperDataCache(ZooKeeperCache cache)

Method Detail

getAsync

public CompletableFuture<Optional<T>> getAsync(String path)

getWithStatAsync

public CompletableFuture<Optional<Map.Entry<T,org.apache.zookeeper.data.Stat>>> getWithStatAsync(String path)

get

public Optional<T> get(String path)
                throws Exception

Return an item from the cache If node doens't exist, the value will be not present.s

Parameters:

path -

Returns:

Throws:

Exception

getWithStat

public Optional<Map.Entry<T,org.apache.zookeeper.data.Stat>> getWithStat(String path)
                                                                  throws Exception

Throws:

Exception

clear

public void clear()

Only for UTs (for now), as this clears the whole ZK data cache.

invalidate

public void invalidate(String path)

reloadCache

public void reloadCache(String path)

Specified by:

reloadCache in interface ZooKeeperCache.CacheUpdater<T>

registerListener

public void registerListener(ZooKeeperCacheListener<T> listener)

Specified by:

registerListener in interface ZooKeeperCache.CacheUpdater<T>

unregisterListener

public void unregisterListener(ZooKeeperCacheListener<T> listener)

Specified by:

unregisterListener in interface ZooKeeperCache.CacheUpdater<T>

process

public void process(WatchedEvent event)

Specified by:

process in interface Watcher

getDataIfPresent

public T getDataIfPresent(String path)

close

public void close()