DiscoverySpiCustomMessage (Ignite 2.17.0)

All Superinterfaces:

Serializable
```
public interface DiscoverySpiCustomMessage
extends Serializable
```
Message to send across ring.

See Also:

GridDiscoveryManager.sendCustomEvent(DiscoveryCustomMessage)

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`@Nullable DiscoverySpiCustomMessage`	`ackMessage()`	Called when custom message has been handled by all nodes.
`boolean`	`isMutable()`
`boolean`	`stopProcess()`	Called on discovery coordinator node after listener is notified.

- Method Detail
  - ackMessage
```
@Nullable
@Nullable DiscoverySpiCustomMessage ackMessage()
```
    Called when custom message has been handled by all nodes.
    
    Returns:
    
    Ack message or null if ack is not required.
  - isMutable
```
boolean isMutable()
```
    Returns:
    
    True if message can be modified during listener notification. Changes will be send to next nodes.
  - stopProcess
```
boolean stopProcess()
```
    Called on discovery coordinator node after listener is notified. If returns true then message is not passed to others nodes, if after this method ackMessage() returns non-null ack message, it is sent to all nodes. Note: this method is used then and only then the zookeeper discovery is configured.
    
    Returns:
    
    True if message should not be sent to all nodes.