org.elasticsearch.action.ingest.IngestActionForwarder Maven / Gradle / Ivy
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Elasticsearch subproject :server
/*
* 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.action.ingest;
import org.elasticsearch.action.ActionType;
import org.elasticsearch.action.ActionListener;
import org.elasticsearch.action.ActionListenerResponseHandler;
import org.elasticsearch.action.ActionRequest;
import org.elasticsearch.cluster.ClusterChangedEvent;
import org.elasticsearch.cluster.ClusterStateApplier;
import org.elasticsearch.cluster.node.DiscoveryNode;
import org.elasticsearch.common.Randomness;
import org.elasticsearch.transport.TransportService;
import java.util.concurrent.atomic.AtomicInteger;
/**
* A utility for forwarding ingest requests to ingest nodes in a round-robin fashion.
*
* TODO: move this into IngestService and make index/bulk actions call that
*/
public final class IngestActionForwarder implements ClusterStateApplier {
private final TransportService transportService;
private final AtomicInteger ingestNodeGenerator = new AtomicInteger(Randomness.get().nextInt());
private DiscoveryNode[] ingestNodes;
public IngestActionForwarder(TransportService transportService) {
this.transportService = transportService;
ingestNodes = new DiscoveryNode[0];
}
public void forwardIngestRequest(ActionType action, ActionRequest request, ActionListener listener) {
transportService.sendRequest(randomIngestNode(), action.name(), request,
new ActionListenerResponseHandler(listener, action.getResponseReader()));
}
private DiscoveryNode randomIngestNode() {
final DiscoveryNode[] nodes = ingestNodes;
if (nodes.length == 0) {
throw new IllegalStateException("There are no ingest nodes in this cluster, unable to forward request to an ingest node.");
}
return nodes[Math.floorMod(ingestNodeGenerator.incrementAndGet(), nodes.length)];
}
@Override
public void applyClusterState(ClusterChangedEvent event) {
ingestNodes = event.state().getNodes().getIngestNodes().values().toArray(DiscoveryNode.class);
}
}