com.hazelcast.spi.discovery.impl

Class PredefinedDiscoveryService

java.lang.Object

com.hazelcast.spi.discovery.impl.PredefinedDiscoveryService

All Implemented Interfaces:

DiscoveryService

public class PredefinedDiscoveryService
extends Object
implements DiscoveryService

Discovery service with a predefined and supplied discovery strategy. All methods delegate to the provided strategy.

Constructor Summary

Constructors

Constructor and Description
PredefinedDiscoveryService(DiscoveryStrategy strategy)

Method Summary

Modifier and Type	Method and Description
void	destroy() The start method is called on system startup to implement simple lifecycle management.
Map<String,Object>	discoverLocalMetadata() Returns a map with discovered metadata provided by the runtime environment.
Iterable<DiscoveryNode>	discoverNodes() Returns a discovered and filtered, if a NodeFilter is setup, set of discovered nodes to connect to.
void	start() The start method is called on system startup to implement simple lifecycle management.

Methods inherited from class java.lang.Object

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

Constructor Detail

PredefinedDiscoveryService

public PredefinedDiscoveryService(DiscoveryStrategy strategy)

Method Detail

start

public void start()

Description copied from interface: DiscoveryService

The start method is called on system startup to implement simple lifecycle management. This method is expected to call DiscoveryStrategy.start() on all discovered and start up strategies.

Specified by:

start in interface DiscoveryService

discoverNodes

public Iterable<DiscoveryNode> discoverNodes()

Description copied from interface: DiscoveryService

Returns a discovered and filtered, if a NodeFilter is setup, set of discovered nodes to connect to.

Specified by:

discoverNodes in interface DiscoveryService

Returns:

a set of discovered and filtered nodes

discoverLocalMetadata

public Map<String,Object> discoverLocalMetadata()

Description copied from interface: DiscoveryService

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 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 DiscoveryService

Returns:

a map of discovered metadata as provided by the runtime environment

destroy

public void destroy()

Description copied from interface: DiscoveryService

The start method is called on system startup to implement simple lifecycle management. This method is expected to call DiscoveryStrategy.destroy() on all discovered and destroy strategies before the service itself will be destroyed.

Specified by:

destroy in interface DiscoveryService