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DataNodeFilter.java
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DataNodeFilter.java
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package common.filters;
import org.apache.ignite.cluster.ClusterNode;
import org.apache.ignite.lang.IgnitePredicate;
/**
* The filter that has to be set in every cache configuration.
* </p>
* It will be called upon a cache startup to define a subset of the cluster nodes where cache data
* will be stored - Data Nodes.
* </p>
* The same filter will be called every time the cluster topology changes which happens when a new cluster node joins
* the cluster or an old one leaves it. When it's executed for the new joined node then depending on the
* filter's execution result the node will be considered as a Data Node and a part of cached data will be rebalanced
* on it or the node will be rejected as a Data Node candidate.
*/
public class DataNodeFilter implements IgnitePredicate<ClusterNode>{
/**
* Checks if {@code node} needs to be considered as a Data Node.
*
* @param node Cluster node instance.
*
* @return {@code true} if the node has to be considered as Data Node, {@code false} otherwise.
*/
public boolean apply(ClusterNode node) {
Boolean dataNode = node.attribute("data.node");
return dataNode != null && dataNode;
}
}