Discovery

org.elasticsearch.discovery

Interface Discovery

All Superinterfaces:

AutoCloseable, LifecycleComponent<Discovery>, Releasable

All Known Implementing Classes:

LocalDiscovery, ZenDiscovery
```
public interface Discovery
extends LifecycleComponent<Discovery>
```
A pluggable module allowing to implement discovery of other nodes, publishing of the cluster state to all nodes, electing a master of the cluster that raises cluster state change events.

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
`static interface`	`Discovery.AckListener`

Method Summary

All Methods

Instance Methods

Abstract Methods
Modifier and Type	Method and Description
`void`	`addListener(InitialStateDiscoveryListener listener)`
`DiscoveryNode`	`localNode()`
`String`	`nodeDescription()`
`void`	`publish(ClusterState clusterState, Discovery.AckListener ackListener)` Publish all the changes to the cluster from the master (can be called just by the master).
`void`	`removeListener(InitialStateDiscoveryListener listener)`
`void`	`setNodeService(NodeService nodeService)` Here as a hack to solve dep injection problem...
`void`	`setRoutingService(RoutingService routingService)` Another hack to solve dep injection problem..., note, this will be called before any start is called.

Methods inherited from interface org.elasticsearch.common.component.LifecycleComponent
addLifecycleListener, lifecycleState, removeLifecycleListener, start, stop

Methods inherited from interface org.elasticsearch.common.lease.Releasable
close

- Method Detail
  - localNode
```
DiscoveryNode localNode()
```
  - addListener
```
void addListener(InitialStateDiscoveryListener listener)
```
  - removeListener
```
void removeListener(InitialStateDiscoveryListener listener)
```
  - nodeDescription
```
String nodeDescription()
```
  - setNodeService
```
void setNodeService(@Nullable
                    NodeService nodeService)
```
    Here as a hack to solve dep injection problem...
  - setRoutingService
```
void setRoutingService(RoutingService routingService)
```
    Another hack to solve dep injection problem..., note, this will be called before any start is called.
  - publish
```
void publish(ClusterState clusterState,
             Discovery.AckListener ackListener)
```
    Publish all the changes to the cluster from the master (can be called just by the master). The publish process should not publish this state to the master as well! (the master is sending it...). The Discovery.AckListener allows to keep track of the ack received from nodes, and verify whether they updated their own cluster state or not.