org.opensearch.plugins.MetadataUpgrader Maven / Gradle / Ivy

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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.
 */

/*
 * 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.plugins;

import org.opensearch.cluster.metadata.IndexTemplateMetadata;
import org.opensearch.cluster.metadata.Metadata;

import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import java.util.function.UnaryOperator;

/**
 * Upgrades {@link Metadata} on startup on behalf of installed {@link Plugin}s
 */
public class MetadataUpgrader {
    public final UnaryOperator> indexTemplateMetadataUpgraders;

    public MetadataUpgrader(Collection>> indexTemplateMetadataUpgraders) {
        this.indexTemplateMetadataUpgraders = templates -> {
            Map upgradedTemplates = new HashMap<>(templates);
            for (UnaryOperator> upgrader : indexTemplateMetadataUpgraders) {
                upgradedTemplates = upgrader.apply(upgradedTemplates);
            }
            return upgradedTemplates;
        };
    }
}