public interface DiscoveryStrategy
DiscoveryStrategyitself is the actual implementation to discover nodes based on whatever environment is used to run the Hazelcast cloud. The internal implementation is completely vendor specific and might use external Java libraries to query APIs or send requests to a external REST service.
DiscoveryStrategies are also free to define any kind of properties that might
be necessary to discover eligible nodes based on configured attributes, tags or any
other kind of metadata.
Using the simple lifecycle management strategies like multicast discovery is able to register and destroy sockets based on Hazelcast’s lifecycle. Deactivated services will also never be started.
Attention: Instead of implementing this interface directly, implementors should consider
using the abstract class
AbstractDiscoveryStrategy instead for easier upgradeability
while this interface evolves.
|Modifier and Type||Method and Description|
Returns a map with discovered metadata provided by the runtime environment.
Returns a set of all discovered nodes based on the defined properties that were used to create the
Returns a custom implementation of a
startmethod 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
DiscoveryNodeinstance passed to the
stopmethod is used to stop internal services, sockets or to destroy any kind of internal state.
PartitionGroupStrategyto override default behavior of zone aware backup strategies
PartitionGroupMetaDataor to provide a specific behavior in case the discovery environment does not provide information about the infrastructure to be used for automatic configuration.
nullin case of the default implementation is to be used
Information discovered from this method are shaded into the
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
inside the cluster system.
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