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Netty 4 based transport implementation
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/*
 * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
 * or more contributor license agreements. Licensed under the Elastic License
 * 2.0 and the Server Side Public License, v 1; you may not use this file except
 * in compliance with, at your election, the Elastic License 2.0 or the Server
 * Side Public License, v 1.
 */

package org.elasticsearch.transport;

import org.apache.lucene.util.SetOnce;
import org.elasticsearch.Version;
import org.elasticsearch.common.io.stream.NamedWriteableRegistry;
import org.elasticsearch.common.network.NetworkModule;
import org.elasticsearch.common.network.NetworkService;
import org.elasticsearch.common.settings.ClusterSettings;
import org.elasticsearch.common.settings.Setting;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.util.BigArrays;
import org.elasticsearch.common.util.PageCacheRecycler;
import org.elasticsearch.http.HttpServerTransport;
import org.elasticsearch.http.netty4.Netty4HttpServerTransport;
import org.elasticsearch.indices.breaker.CircuitBreakerService;
import org.elasticsearch.plugins.NetworkPlugin;
import org.elasticsearch.plugins.Plugin;
import org.elasticsearch.threadpool.ThreadPool;
import org.elasticsearch.transport.netty4.Netty4Transport;
import org.elasticsearch.xcontent.NamedXContentRegistry;

import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.function.Supplier;

public class Netty4Plugin extends Plugin implements NetworkPlugin {

    public static final String NETTY_TRANSPORT_NAME = "netty4";
    public static final String NETTY_HTTP_TRANSPORT_NAME = "netty4";

    private final SetOnce groupFactory = new SetOnce<>();

    @Override
    public List> getSettings() {
        return Arrays.asList(
            Netty4HttpServerTransport.SETTING_HTTP_NETTY_MAX_COMPOSITE_BUFFER_COMPONENTS,
            Netty4HttpServerTransport.SETTING_HTTP_WORKER_COUNT,
            Netty4HttpServerTransport.SETTING_HTTP_NETTY_RECEIVE_PREDICTOR_SIZE,
            Netty4Transport.WORKER_COUNT,
            Netty4Transport.NETTY_RECEIVE_PREDICTOR_SIZE,
            Netty4Transport.NETTY_RECEIVE_PREDICTOR_MIN,
            Netty4Transport.NETTY_RECEIVE_PREDICTOR_MAX,
            Netty4Transport.NETTY_BOSS_COUNT
        );
    }

    @Override
    public Settings additionalSettings() {
        return Settings.builder()
            // here we set the netty4 transport and http transport as the default. This is a set once setting
            // ie. if another plugin does that as well the server will fail - only one default network can exist!
            .put(NetworkModule.HTTP_DEFAULT_TYPE_SETTING.getKey(), NETTY_HTTP_TRANSPORT_NAME)
            .put(NetworkModule.TRANSPORT_DEFAULT_TYPE_SETTING.getKey(), NETTY_TRANSPORT_NAME)
            .build();
    }

    @Override
    public Map> getTransports(
        Settings settings,
        ThreadPool threadPool,
        PageCacheRecycler pageCacheRecycler,
        CircuitBreakerService circuitBreakerService,
        NamedWriteableRegistry namedWriteableRegistry,
        NetworkService networkService
    ) {
        return Collections.singletonMap(
            NETTY_TRANSPORT_NAME,
            () -> new Netty4Transport(
                settings,
                Version.CURRENT,
                threadPool,
                networkService,
                pageCacheRecycler,
                namedWriteableRegistry,
                circuitBreakerService,
                getSharedGroupFactory(settings)
            )
        );
    }

    @Override
    public Map> getHttpTransports(
        Settings settings,
        ThreadPool threadPool,
        BigArrays bigArrays,
        PageCacheRecycler pageCacheRecycler,
        CircuitBreakerService circuitBreakerService,
        NamedXContentRegistry xContentRegistry,
        NetworkService networkService,
        HttpServerTransport.Dispatcher dispatcher,
        ClusterSettings clusterSettings
    ) {
        return Collections.singletonMap(
            NETTY_HTTP_TRANSPORT_NAME,
            () -> new Netty4HttpServerTransport(
                settings,
                networkService,
                bigArrays,
                threadPool,
                xContentRegistry,
                dispatcher,
                clusterSettings,
                getSharedGroupFactory(settings)
            )
        );
    }

    private SharedGroupFactory getSharedGroupFactory(Settings settings) {
        SharedGroupFactory groupFactory = this.groupFactory.get();
        if (groupFactory != null) {
            assert groupFactory.getSettings().equals(settings) : "Different settings than originally provided";
            return groupFactory;
        } else {
            this.groupFactory.set(new SharedGroupFactory(settings));
            return this.groupFactory.get();
        }
    }
}