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Add CountDownActionListener (#92308)
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server/src/main/java/org/elasticsearch/action/support/CountDownActionListener.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,82 @@ | ||
| /* | ||
| * 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.support; | ||
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| import org.elasticsearch.action.ActionListener; | ||
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| import java.util.Objects; | ||
| import java.util.concurrent.atomic.AtomicInteger; | ||
| import java.util.concurrent.atomic.AtomicReference; | ||
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| /** | ||
| * Wraps another listener and adds a counter -- each invocation of this listener will decrement the counter, and when the counter has been | ||
| * exhausted the final invocation of this listener will delegate to the wrapped listener. Similar to {@link GroupedActionListener}, but for | ||
| * the cases where tracking individual results is not useful. | ||
| */ | ||
| public final class CountDownActionListener extends ActionListener.Delegating<Void, Void> { | ||
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| private final AtomicInteger countDown; | ||
| private final AtomicReference<Exception> failure = new AtomicReference<>(); | ||
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| /** | ||
| * Creates a new listener | ||
| * @param groupSize the group size | ||
| * @param delegate the delegate listener | ||
| */ | ||
| public CountDownActionListener(int groupSize, ActionListener<Void> delegate) { | ||
| super(Objects.requireNonNull(delegate)); | ||
| if (groupSize <= 0) { | ||
| assert false : "illegal group size [" + groupSize + "]"; | ||
| throw new IllegalArgumentException("groupSize must be greater than 0 but was " + groupSize); | ||
| } | ||
| countDown = new AtomicInteger(groupSize); | ||
| } | ||
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| /** | ||
| * Creates a new listener | ||
| * @param groupSize the group size | ||
| * @param runnable the runnable | ||
| */ | ||
| public CountDownActionListener(int groupSize, Runnable runnable) { | ||
| this(groupSize, ActionListener.wrap(Objects.requireNonNull(runnable))); | ||
| } | ||
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| private boolean countDown() { | ||
| final var result = countDown.getAndUpdate(current -> Math.max(0, current - 1)); | ||
| assert result > 0; | ||
| return result == 1; | ||
| } | ||
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| @Override | ||
| public void onResponse(Void element) { | ||
| if (countDown()) { | ||
| if (failure.get() != null) { | ||
| super.onFailure(failure.get()); | ||
| } else { | ||
| delegate.onResponse(element); | ||
| } | ||
| } | ||
| } | ||
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| @Override | ||
| public void onFailure(Exception e) { | ||
| if (failure.compareAndSet(null, e) == false) { | ||
| failure.accumulateAndGet(e, (current, update) -> { | ||
| // we have to avoid self-suppression! | ||
| if (update != current) { | ||
| current.addSuppressed(update); | ||
| } | ||
| return current; | ||
| }); | ||
| } | ||
| if (countDown()) { | ||
| super.onFailure(failure.get()); | ||
| } | ||
| } | ||
|
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| } |
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