com.hazelcast.spi.discovery.multicast

Class MulticastDiscoveryStrategy

java.lang.Object

com.hazelcast.spi.discovery.AbstractDiscoveryStrategy

com.hazelcast.spi.discovery.multicast.MulticastDiscoveryStrategy

All Implemented Interfaces:

DiscoveryStrategy

public class MulticastDiscoveryStrategy
extends AbstractDiscoveryStrategy

The multicast DiscoveryStrategy.

Constructor Summary

Constructors

Constructor and Description
MulticastDiscoveryStrategy(DiscoveryNode discoveryNode, ILogger logger, Map<String,Comparable> properties)

Method Summary

Modifier and Type	Method and Description
void	destroy() The stop method is used to stop internal services, sockets or to destroy any kind of internal state.
Map<String,Object>	discoverLocalMetadata() Returns a map with discovered metadata provided by the runtime environment.
Iterable<DiscoveryNode>	discoverNodes() Returns a set of all discovered nodes based on the defined properties that were used to create the DiscoveryStrategy instance.
PartitionGroupStrategy	getPartitionGroupStrategy() Returns a custom implementation of a PartitionGroupStrategy to override default behavior of zone aware backup strategies PartitionGroupMetaData or to provide a specific behavior in case the discovery environment does not provide information about the infrastructure to be used for automatic configuration.
void	start() The start method is used to initialize internal state and perform any kind of startup procedure like multicast socket creation.

Methods inherited from class com.hazelcast.spi.discovery.AbstractDiscoveryStrategy

getLogger, getOrDefault, getOrDefault, getOrNull, getOrNull, getProperties

Methods inherited from class java.lang.Object

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

Constructor Detail

MulticastDiscoveryStrategy

public MulticastDiscoveryStrategy(DiscoveryNode discoveryNode,
                                  ILogger logger,
                                  Map<String,Comparable> properties)

Method Detail

start

public void start()

Description copied from interface: DiscoveryStrategy

The start method is used to initialize internal state and perform any kind of startup procedure like multicast socket creation. The behavior of this method might change based on the DiscoveryNode instance passed to the DiscoveryStrategyFactory.

Specified by:

start in interface DiscoveryStrategy

Overrides:

start in class AbstractDiscoveryStrategy

discoverNodes

public Iterable<DiscoveryNode> discoverNodes()

Description copied from interface: DiscoveryStrategy

Returns a set of all discovered nodes based on the defined properties that were used to create the DiscoveryStrategy instance.

Returns:

a set of all discovered nodes

destroy

public void destroy()

Description copied from interface: DiscoveryStrategy

The stop method is used to stop internal services, sockets or to destroy any kind of internal state.

Specified by:

destroy in interface DiscoveryStrategy

Overrides:

destroy in class AbstractDiscoveryStrategy

getPartitionGroupStrategy

public PartitionGroupStrategy getPartitionGroupStrategy()

Description copied from interface: DiscoveryStrategy

Returns a custom implementation of a PartitionGroupStrategy to override default behavior of zone aware backup strategies PartitionGroupMetaData or to provide a specific behavior in case the discovery environment does not provide information about the infrastructure to be used for automatic configuration.

Specified by:

getPartitionGroupStrategy in interface DiscoveryStrategy

Overrides:

getPartitionGroupStrategy in class AbstractDiscoveryStrategy

Returns:

a custom implementation of a PartitionGroupStrategy otherwise null in case of the default implementation is to be used

discoverLocalMetadata

public Map<String,Object> discoverLocalMetadata()

Description copied from interface: DiscoveryStrategy

Returns a map with discovered metadata provided by the runtime environment. Those information may include, but are not limited, to location information like datacenter, rack, host, node name or additional tags to be used for custom purpose.

Information discovered from this method are shaded into the Members attributes. Existing attributes will not be overridden, that way local attribute configuration overrides provided metadata.

The default implementation provides an empty map with no further metadata configured. Returning null is not permitted and will most probably result in an NullPointerException inside the cluster system.

Specified by:

discoverLocalMetadata in interface DiscoveryStrategy

Overrides:

discoverLocalMetadata in class AbstractDiscoveryStrategy

Returns:

a map of discovered metadata as provided by the runtime environment