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@@ -13,4 +13,5 @@ BWC_VERSION: | |
| - "2.4.1" | ||
| - "2.4.2" | ||
| - "2.5.0" | ||
| - "2.5.1" | ||
| - "2.6.0" | ||
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| --- | ||
| title: Gradle Check Failure. | ||
| labels: >test-failure bug | ||
| --- | ||
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| A gradle check workflow has failed after merge. | ||
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| PR: {{ env.workflow_url }} | ||
| CommitId: {{ env.pr_from_sha }} |
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104 changes: 104 additions & 0 deletions
104
libs/core/src/main/java/org/opensearch/common/SetOnce.java
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| /* | ||
| * SPDX-License-Identifier: Apache-2.0 | ||
| * | ||
| * The OpenSearch Contributors require contributions made to | ||
| * this file be licensed under the Apache-2.0 license or a | ||
| * compatible open source license. | ||
| */ | ||
|
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| /* | ||
| * Licensed to the Apache Software Foundation (ASF) under one or more | ||
| * contributor license agreements. See the NOTICE file distributed with | ||
| * this work for additional information regarding copyright ownership. | ||
| * The ASF 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. | ||
| */ | ||
|
|
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| /* | ||
| * Modifications Copyright OpenSearch Contributors. See | ||
| * GitHub history for details. | ||
| */ | ||
| package org.opensearch.common; | ||
|
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| import java.util.concurrent.atomic.AtomicReference; | ||
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| /** | ||
| * A convenient class which offers a semi-immutable object wrapper implementation which allows one | ||
| * to set the value of an object exactly once, and retrieve it many times. If {@link #set(Object)} | ||
| * is called more than once, {@link AlreadySetException} is thrown and the operation will fail. | ||
| * | ||
| * This is borrowed from lucene's experimental API. It is not reused to eliminate the dependency | ||
| * on lucene core for such a simple (standalone) utility class that may change beyond OpenSearch needs. | ||
| * | ||
| * @opensearch.api | ||
| */ | ||
| public final class SetOnce<T> implements Cloneable { | ||
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| /** Thrown when {@link SetOnce#set(Object)} is called more than once. */ | ||
| public static final class AlreadySetException extends IllegalStateException { | ||
| public AlreadySetException() { | ||
| super("The object cannot be set twice!"); | ||
| } | ||
| } | ||
|
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| /** Holding object and marking that it was already set */ | ||
| private static final class Wrapper<T> { | ||
| private T object; | ||
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| private Wrapper(T object) { | ||
| this.object = object; | ||
| } | ||
| } | ||
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| private final AtomicReference<Wrapper<T>> set; | ||
|
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| /** | ||
| * A default constructor which does not set the internal object, and allows setting it by calling | ||
| * {@link #set(Object)}. | ||
| */ | ||
| public SetOnce() { | ||
| set = new AtomicReference<>(); | ||
| } | ||
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| /** | ||
| * Creates a new instance with the internal object set to the given object. Note that any calls to | ||
| * {@link #set(Object)} afterwards will result in {@link AlreadySetException} | ||
| * | ||
| * @throws AlreadySetException if called more than once | ||
| * @see #set(Object) | ||
| */ | ||
| public SetOnce(T obj) { | ||
| set = new AtomicReference<>(new Wrapper<>(obj)); | ||
| } | ||
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| /** Sets the given object. If the object has already been set, an exception is thrown. */ | ||
| public final void set(T obj) { | ||
| if (!trySet(obj)) { | ||
| throw new AlreadySetException(); | ||
| } | ||
| } | ||
|
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| /** | ||
| * Sets the given object if none was set before. | ||
| * | ||
| * @return true if object was set successfully, false otherwise | ||
| */ | ||
| public final boolean trySet(T obj) { | ||
| return set.compareAndSet(null, new Wrapper<>(obj)); | ||
| } | ||
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| /** Returns the object set by {@link #set(Object)}. */ | ||
| public final T get() { | ||
| Wrapper<T> wrapper = set.get(); | ||
| return wrapper == null ? null : wrapper.object; | ||
| } | ||
| } |
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