org.apache.pulsar.broker.namespace

Class OwnershipCache

java.lang.Object

org.apache.pulsar.broker.namespace.OwnershipCache

public class OwnershipCache
extends Object

This class provides a cache service for all the service unit ownership among the brokers. It provide a cache service as well as MetadataStore read/write functions for a) lookup of a service unit ownership to a broker; b) take ownership of a service unit by the local broker

Constructor Summary

Constructors

Constructor and Description
OwnershipCache(PulsarService pulsar, NamespaceBundleFactory bundleFactory, NamespaceService namespaceService) Constructor of OwnershipCache.

Method Summary

Modifier and Type	Method and Description
CompletableFuture<Boolean>	checkOwnershipAsync(NamespaceBundle bundle) Check whether this broker owns given namespace bundle.
CompletableFuture<Void>	disableOwnership(NamespaceBundle bundle) Disable bundle in local cache and on zk.
OwnedBundle	getOwnedBundle(NamespaceBundle bundle) Return the OwnedBundle instance from the local cache.
Optional<CompletableFuture<OwnedBundle>>	getOwnedBundleAsync(NamespaceBundle bundle)
Map<NamespaceBundle,OwnedBundle>	getOwnedBundles() Method to access the map of all ServiceUnit objects owned by the local broker.
CompletableFuture<Optional<NamespaceEphemeralData>>	getOwnerAsync(NamespaceBundle suName) Method to get the current owner of the ServiceUnit.
void	invalidateLocalOwnerCache()
boolean	isNamespaceBundleOwned(NamespaceBundle bundle) Checked whether a particular bundle is currently owned by this broker.
boolean	refreshSelfOwnerInfo()
CompletableFuture<Void>	removeOwnership(NamespaceBundle bundle) Method to remove the ownership of local broker on the NamespaceBundle, if owned.
CompletableFuture<Void>	removeOwnership(NamespaceBundles bundles) Method to remove ownership of all owned bundles.
CompletableFuture<NamespaceEphemeralData>	tryAcquiringOwnership(NamespaceBundle bundle) Method to get the current owner of the ServiceUnit or set the local broker as the owner if absent.
CompletableFuture<Void>	updateBundleState(NamespaceBundle bundle, boolean isActive) Update bundle state in a local cache.

Methods inherited from class java.lang.Object

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

Constructor Detail

OwnershipCache

public OwnershipCache(PulsarService pulsar,
                      NamespaceBundleFactory bundleFactory,
                      NamespaceService namespaceService)

Constructor of OwnershipCache. the local broker URL that will be set as owner for the ServiceUnit

Method Detail

checkOwnershipAsync

public CompletableFuture<Boolean> checkOwnershipAsync(NamespaceBundle bundle)

Check whether this broker owns given namespace bundle.

Parameters:

bundle - namespace bundle

Returns:

future that will complete with check result

getOwnerAsync

public CompletableFuture<Optional<NamespaceEphemeralData>> getOwnerAsync(NamespaceBundle suName)

Method to get the current owner of the ServiceUnit.

Parameters:

suName - name of the ServiceUnit

Returns:

The ephemeral node data showing the current ownership info in ZooKeeper

Throws:

Exception - throws exception if no ownership info is found

tryAcquiringOwnership

public CompletableFuture<NamespaceEphemeralData> tryAcquiringOwnership(NamespaceBundle bundle)
                                                                throws Exception

Method to get the current owner of the ServiceUnit or set the local broker as the owner if absent.

Parameters:

bundle - the NamespaceBundle

Returns:

The ephemeral node data showing the current ownership info in ZooKeeper

Throws:

Exception

removeOwnership

public CompletableFuture<Void> removeOwnership(NamespaceBundle bundle)

Method to remove the ownership of local broker on the NamespaceBundle, if owned.

removeOwnership

public CompletableFuture<Void> removeOwnership(NamespaceBundles bundles)

Method to remove ownership of all owned bundles.

Parameters:

bundles - NamespaceBundles to remove from ownership cache

getOwnedBundles

public Map<NamespaceBundle,OwnedBundle> getOwnedBundles()

Method to access the map of all ServiceUnit objects owned by the local broker.

Returns:

a map of owned ServiceUnit objects

isNamespaceBundleOwned

public boolean isNamespaceBundleOwned(NamespaceBundle bundle)

Checked whether a particular bundle is currently owned by this broker.

Parameters:

bundle -

Returns:

getOwnedBundle

public OwnedBundle getOwnedBundle(NamespaceBundle bundle)

Return the OwnedBundle instance from the local cache. Does not block.

Parameters:

bundle -

Returns:

getOwnedBundleAsync

public Optional<CompletableFuture<OwnedBundle>> getOwnedBundleAsync(NamespaceBundle bundle)

disableOwnership

public CompletableFuture<Void> disableOwnership(NamespaceBundle bundle)

Disable bundle in local cache and on zk.

Parameters:

bundle -

Throws:

Exception

updateBundleState

public CompletableFuture<Void> updateBundleState(NamespaceBundle bundle,
                                                 boolean isActive)

Update bundle state in a local cache.

Parameters:

bundle -

Throws:

Exception

invalidateLocalOwnerCache

public void invalidateLocalOwnerCache()

refreshSelfOwnerInfo

public boolean refreshSelfOwnerInfo()