/* * 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. */ /* * 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. */ /* * Modifications Copyright OpenSearch Contributors. See * GitHub history for details. */ package org.opensearch.cluster; import java.util.function.Consumer; /** * {@link ClusterInfoService} that provides empty maps for disk usage and shard sizes * * @opensearch.internal */ public class EmptyClusterInfoService implements ClusterInfoService { public static final EmptyClusterInfoService INSTANCE = new EmptyClusterInfoService(); @Override public ClusterInfo getClusterInfo() { return ClusterInfo.EMPTY; } @Override public void addListener(Consumer<ClusterInfo> clusterInfoConsumer) { // never updated, so we can discard the listener } }