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ExtensiblePlugin.java
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ExtensiblePlugin.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.
*/
/*
* 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 java.util.List;
/**
* An extension point for {@link Plugin} implementations to be themselves extensible.
* <p>
* This class provides a callback for extensible plugins to be informed of other plugins
* which extend them.
*
* @opensearch.api
*/
public interface ExtensiblePlugin {
/**
* Extension point for external plugins to be extendable
*
* @opensearch.api
*/
interface ExtensionLoader {
/**
* Load extensions of the type from all extending plugins. The concrete extensions must have either a no-arg constructor
* or a single-arg constructor accepting the specific plugin class.
* @param extensionPointType the extension point type
* @param <T> extension point type
* @return all implementing extensions.
*/
<T> List<T> loadExtensions(Class<T> extensionPointType);
}
/**
* Allow this plugin to load extensions from other plugins.
* <p>
* This method is called once only, after initializing this plugin and all plugins extending this plugin. It is called before
* any other methods on this Plugin instance are called.
*/
default void loadExtensions(ExtensionLoader loader) {}
}