TransportLivenessAction.java example

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 * the Apache License, Version 2.0 (the "License"); you may
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 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
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package org.elasticsearch.action.admin.cluster.node.liveness;

import org.elasticsearch.cluster.service.ClusterService;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.threadpool.ThreadPool;
import org.elasticsearch.transport.TransportChannel;
import org.elasticsearch.transport.TransportRequestHandler;
import org.elasticsearch.transport.TransportService;

public final class TransportLivenessAction implements TransportRequestHandler<LivenessRequest> {

    private final ClusterService clusterService;
    public static final String NAME = "cluster:monitor/nodes/liveness";

    @Inject
    public TransportLivenessAction(ClusterService clusterService, TransportService transportService) {
        this.clusterService = clusterService;
        transportService.registerRequestHandler(NAME, LivenessRequest::new, ThreadPool.Names.SAME,
            false, false /*can not trip circuit breaker*/, this);
    }

    @Override
    public void messageReceived(LivenessRequest request, TransportChannel channel) throws Exception {
        channel.sendResponse(new LivenessResponse(clusterService.getClusterName(), clusterService.localNode()));
    }
}