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server/src/main/java/org/elasticsearch/action/search/RemoteClusterActionListener.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,68 @@ | ||
| /* | ||
| * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one | ||
| * or more contributor license agreements. Licensed under the Elastic License | ||
| * 2.0 and the Server Side Public License, v 1; you may not use this file except | ||
| * in compliance with, at your election, the Elastic License 2.0 or the Server | ||
| * Side Public License, v 1. | ||
| */ | ||
| package org.elasticsearch.action.search; | ||
|
|
||
| import org.elasticsearch.action.ActionListener; | ||
| import org.elasticsearch.action.DelegatingActionListener; | ||
| import org.elasticsearch.common.util.concurrent.CountDown; | ||
|
|
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| import java.util.Map; | ||
| import java.util.concurrent.ConcurrentHashMap; | ||
| import java.util.concurrent.atomic.AtomicReference; | ||
|
|
||
| /** | ||
| * Action listener for operations that are performed on a group of remote clusters. | ||
| * It will wait for all operations to complete and then delegate to the upstream listener. | ||
| * Does not fail if one of the operations fails. | ||
| * <br> | ||
| * Returns a map of the results per cluster name via {@link #remoteListener(String)} method. | ||
| * This is the listener that should be used to perform the individual operation on the remote cluster. | ||
| * | ||
| * @param <T> the type of the individual per-cluster result | ||
| */ | ||
| public class RemoteClusterActionListener<T> extends DelegatingActionListener<T, Map<String, T>> { | ||
| private final CountDown countDown; | ||
| private final Map<String, T> results; | ||
| private final AtomicReference<Exception> failure = new AtomicReference<>(); | ||
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| public RemoteClusterActionListener(int groupSize, ActionListener<Map<String, T>> delegate) { | ||
| super(delegate); | ||
| if (groupSize <= 0) { | ||
| assert false : "illegal group size [" + groupSize + "]"; | ||
| throw new IllegalArgumentException("groupSize must be greater than 0 but was " + groupSize); | ||
| } | ||
| results = new ConcurrentHashMap<>(groupSize); | ||
| countDown = new CountDown(groupSize); | ||
| } | ||
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| public ActionListener<T> remoteListener(String clusterAlias) { | ||
| return delegateFailure((l, r) -> { | ||
| results.put(clusterAlias, r); | ||
| l.onResponse(r); | ||
| }); | ||
| } | ||
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| @Override | ||
| public void onResponse(T element) { | ||
| if (countDown.countDown()) { | ||
| delegate.onResponse(results); | ||
| } | ||
| } | ||
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| @Override | ||
| public void onFailure(Exception e) { | ||
| // TODO: how do we report the failures? | ||
| final var firstException = failure.compareAndExchange(null, e); | ||
| if (firstException != null && firstException != e) { | ||
| firstException.addSuppressed(e); | ||
| } | ||
| if (countDown.countDown()) { | ||
| delegate.onResponse(results); | ||
| } | ||
| } | ||
| } |
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