ChannelHandlerMetadataUtil.java — netty Source File

Source Code

/*
 * Copyright 2022 The Netty Project
 *
 * The Netty Project 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:
 *
 *   https://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 io.netty.nativeimage;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.reflect.TypeToken;
import io.netty.channel.ChannelHandler;
import io.netty.channel.NativeImageHandlerMetadataTest;
import org.junit.jupiter.api.Assertions;
import org.reflections.Reflections;
import org.reflections.util.ConfigurationBuilder;

import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.lang.reflect.Type;
import java.net.URL;
import java.text.Collator;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

/**
 * Generates native-image reflection metadata for subtypes of {@link io.netty.channel.ChannelHandler}.
 * <p>
 * To use, create a JUnit test in the desired Netty module and invoke {@link #generateMetadata(String...)} with a list
 * of packages present in the target Netty module that may contain subtypes of the ChannelHandler.
 * <p>
 * See {@link NativeImageHandlerMetadataTest}
 */
public final class ChannelHandlerMetadataUtil {

    private static final Type HANDLER_METADATA_LIST_TYPE = new TypeToken<List<HandlerMetadata>>() {
    }.getType();
    private static final Gson gson = new GsonBuilder().setPrettyPrinting().create();

    private ChannelHandlerMetadataUtil() {
    }

    public static void generateMetadata(String... packageNames) {
        String projectGroupId = System.getProperty("nativeImage.handlerMetadataGroupId");
        String projectArtifactId = System.getProperty("nativeimage.handlerMetadataArtifactId");
// ... (186 more lines)