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/*
 * 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.
 */

package org.elasticsearch.plugins;

import org.elasticsearch.common.component.LifecycleComponent;
import org.elasticsearch.common.inject.Module;
import org.elasticsearch.common.settings.Settings;

import java.io.Closeable;
import java.util.Collection;
import java.util.Collections;

/**
 * An extension point allowing to plug in custom functionality.
 * 

* A plugin can be register custom extensions to builtin behavior by implementing onModule(AnyModule), * and registering the extension with the given module. */ public abstract class Plugin { /** * The name of the plugin. */ public abstract String name(); /** * The description of the plugin. */ public abstract String description(); /** * Node level modules. */ public Collection nodeModules() { return Collections.emptyList(); } /** * Node level services that will be automatically started/stopped/closed. */ public Collection> nodeServices() { return Collections.emptyList(); } /** * Per index modules. */ public Collection indexModules(Settings indexSettings) { return Collections.emptyList(); } /** * Per index services that will be automatically closed. */ public Collection> indexServices() { return Collections.emptyList(); } /** * Per index shard module. */ public Collection shardModules(Settings indexSettings) { return Collections.emptyList(); } /** * Per index shard service that will be automatically closed. */ public Collection> shardServices() { return Collections.emptyList(); } /** * Additional node settings loaded by the plugin. Note that settings that are explicit in the nodes settings can't be * overwritten with the additional settings. These settings added if they don't exist. */ public Settings additionalSettings() { return Settings.Builder.EMPTY_SETTINGS; } }





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