Package org.apache.bookkeeper.client

Class TopologyAwareEnsemblePlacementPolicy.DefaultResolver

java.lang.Object

org.apache.bookkeeper.client.TopologyAwareEnsemblePlacementPolicy.DefaultResolver

All Implemented Interfaces:

DNSToSwitchMapping

Enclosing class:

TopologyAwareEnsemblePlacementPolicy

static class TopologyAwareEnsemblePlacementPolicy.DefaultResolver
extends Object
implements DNSToSwitchMapping

Field Summary

Fields

Modifier and Type	Field	Description
(package private) final Supplier<String>	defaultRackSupplier

Constructor Summary

Constructors

Constructor	Description
DefaultResolver(Supplier<String> defaultRackSupplier)

Method Summary

Modifier and Type	Method	Description
void	reloadCachedMappings()	Reload all of the cached mappings.
List<String>	resolve(List<String> names)	Resolves a list of DNS-names/IP-addresses and returns back a list of switch information (network paths).

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.bookkeeper.net.DNSToSwitchMapping

setBookieAddressResolver, useHostName

Field Details

defaultRackSupplier

final Supplier<String> defaultRackSupplier

Constructor Details

DefaultResolver

public DefaultResolver(Supplier<String> defaultRackSupplier)

Method Details

resolve

public List<String> resolve(List<String> names)

Description copied from interface: DNSToSwitchMapping

Resolves a list of DNS-names/IP-addresses and returns back a list of switch information (network paths). One-to-one correspondence must be maintained between the elements in the lists. Consider an element in the argument list - x.y.com. The switch information that is returned must be a network path of the form /foo/rack, where / is the root, and 'foo' is the switch where 'rack' is connected. Note the hostname/ip-address is not part of the returned path. The network topology of the cluster would determine the number of components in the network path.

If a name cannot be resolved to a rack, the implementation should return NetworkTopology.DEFAULT_REGION_AND_RACK. This is what the bundled implementations do, though it is not a formal requirement

Specified by:

resolve in interface DNSToSwitchMapping

Parameters:

names - the list of hosts to resolve (can be empty)

Returns:

list of resolved network paths. If names is empty, the returned list is also empty

reloadCachedMappings

public void reloadCachedMappings()

Description copied from interface: DNSToSwitchMapping

Reload all of the cached mappings.

If there is a cache, this method will clear it, so that future accesses will get a chance to see the new data.

Specified by:

reloadCachedMappings in interface DNSToSwitchMapping