org.apache.ignite.configuration

Interface TopologyValidator

All Superinterfaces:

Serializable

public interface TopologyValidator
extends Serializable

Topology validator checks whether the new topology is valid for specific cache at each topology change.

Topology is always valid in case no topology validator used.

In case topology is valid for specific cache all operations on this cache are allowed.

In case topology is not valid for specific cache all update operations on this cache are restricted:

• CacheException will be thrown at update operations (put, remove, etc) attempt.
• IgniteException will be thrown at transaction commit attempt.

Usage example

Following validator allows to put data only in case topology contains exactly 2 nodes:

new TopologyValidator() {
    public boolean validate(Collection<ClusterNode> nodes) {
       return nodes.size() == 2;
    }
 }
 

Method Summary

Methods

Modifier and Type	Method and Description
boolean	validate(Collection<ClusterNode> nodes) Validates topology.

Method Detail

validate

boolean validate(Collection<ClusterNode> nodes)

Validates topology.

Parameters:

nodes - Collection of nodes.

Returns:

true in case topology is valid for specific cache, otherwise false