OpenSearch/src/main/java/org/elasticsearch/discovery/AckClusterStatePublishResponseHandler.java

/*
 * Licensed to Elasticsearch under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch 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 org.elasticsearch.discovery;

import org.elasticsearch.cluster.node.DiscoveryNode;
import org.elasticsearch.common.logging.ESLogger;
import org.elasticsearch.common.logging.ESLoggerFactory;

/**
 * Allows to wait for all nodes to reply to the publish of a new cluster state
 * and notifies the {@link org.elasticsearch.discovery.Discovery.AckListener}
 * so that the cluster state update can be acknowledged
 */
public class AckClusterStatePublishResponseHandler extends BlockingClusterStatePublishResponseHandler {

    private static final ESLogger logger = ESLoggerFactory.getLogger(AckClusterStatePublishResponseHandler.class.getName());

    private final Discovery.AckListener ackListener;

    /**
     * Creates a new AckClusterStatePublishResponseHandler
     * @param nonMasterNodes number of nodes that are supposed to reply to a cluster state publish from master
     * @param ackListener the {@link org.elasticsearch.discovery.Discovery.AckListener} to notify for each response
     *                    gotten from non master nodes
     */
    public AckClusterStatePublishResponseHandler(int nonMasterNodes, Discovery.AckListener ackListener) {
        //Don't count the master as acknowledged, because it's not done yet
        //otherwise we might end up with all the nodes but the master holding the latest cluster state
        super(nonMasterNodes);
        this.ackListener = ackListener;
    }

    @Override
    public void onResponse(DiscoveryNode node) {
        super.onResponse(node);
        onNodeAck(ackListener, node, null);
    }

    @Override
    public void onFailure(DiscoveryNode node, Throwable t) {
        try {
            super.onFailure(node, t);
        } finally {
            onNodeAck(ackListener, node, t);
        }
    }

    private void onNodeAck(final Discovery.AckListener ackListener, DiscoveryNode node, Throwable t) {
        try {
            ackListener.onNodeAck(node, t);
        } catch (Throwable t1) {
            logger.debug("error while processing ack for node [{}]", t1, node);
        }
    }
}