fabric-loom/src/main/java/net/fabricmc/loom/task/fernflower/ThreadSafeResultSaver.java

/*
 * This file is part of fabric-loom, licensed under the MIT License (MIT).
 *
 * Copyright (c) 2016, 2017, 2018 FabricMC
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package net.fabricmc.loom.task.fernflower;

import net.fabricmc.fernflower.api.IFabricResultSaver;
import org.jetbrains.java.decompiler.main.DecompilerContext;
import org.jetbrains.java.decompiler.main.extern.IResultSaver;

import java.io.*;
import java.nio.charset.StandardCharsets;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.function.Supplier;
import java.util.jar.JarOutputStream;
import java.util.jar.Manifest;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

/**
 * Created by covers1624 on 18/02/19.
 */
public class ThreadSafeResultSaver implements IResultSaver, IFabricResultSaver {
    private final Supplier<File> output;
    private final Supplier<File> lineMapFile;

    public Map<String, ZipOutputStream> outputStreams = new HashMap<>();
    public Map<String, ExecutorService> saveExecutors = new HashMap<>();
    public PrintWriter lineMapWriter;

    public ThreadSafeResultSaver(Supplier<File> output, Supplier<File> lineMapFile) {
        this.output = output;
        this.lineMapFile = lineMapFile;
    }

    @Override
    public void createArchive(String path, String archiveName, Manifest manifest) {
        String key = path + "/" + archiveName;
        File file = output.get();
        try {
            FileOutputStream fos = new FileOutputStream(file);
            ZipOutputStream zos = manifest == null ? new ZipOutputStream(fos) : new JarOutputStream(fos, manifest);
            outputStreams.put(key, zos);
            saveExecutors.put(key, Executors.newSingleThreadExecutor());
        } catch (IOException e) {
            throw new RuntimeException("Unable to create archive: " + file, e);
        }
        if (lineMapFile.get() != null) {
            try {
                lineMapWriter = new PrintWriter(new FileWriter(lineMapFile.get()));
            } catch (IOException e) {
                throw new RuntimeException("Unable to create line mapping file: " + lineMapFile.get(), e);
            }
        }
    }

    @Override
    public void saveClassEntry(String path, String archiveName, String qualifiedName, String entryName, String content) {
        this.saveClassEntry(path, archiveName, qualifiedName, entryName, content, null);
    }

    @Override
    public void saveClassEntry(String path, String archiveName, String qualifiedName, String entryName, String content, int[] mapping) {
        String key = path + "/" + archiveName;
        ExecutorService executor = saveExecutors.get(key);
        executor.submit(() -> {
            ZipOutputStream zos = outputStreams.get(key);
            try {
                zos.putNextEntry(new ZipEntry(entryName));
                if (content != null) {
                    zos.write(content.getBytes(StandardCharsets.UTF_8));
                }
            } catch (IOException e) {
                DecompilerContext.getLogger().writeMessage("Cannot write entry " + entryName, e);
            }
            if (mapping != null && lineMapWriter != null) {
                int maxLine = 0;
                int maxLineDest = 0;
                StringBuilder builder = new StringBuilder();
                for (int i = 0; i < mapping.length; i += 2) {
                    maxLine = Math.max(maxLine, mapping[i]);
                    maxLineDest = Math.max(maxLineDest, mapping[i + 1]);
                    builder.append("\t").append(mapping[i]).append("\t").append(mapping[i + 1]).append("\n");
                }
                lineMapWriter.println(qualifiedName + "\t" + maxLine + "\t" + maxLineDest);
                lineMapWriter.println(builder.toString());
            }
        });
    }

    @Override
    public void closeArchive(String path, String archiveName) {
        String key = path + "/" + archiveName;
        ExecutorService executor = saveExecutors.get(key);
        Future<?> closeFuture = executor.submit(() -> {
            ZipOutputStream zos = outputStreams.get(key);
            try {
                zos.close();
            } catch (IOException e) {
                throw new RuntimeException("Unable to close zip. " + key, e);
            }
        });
        executor.shutdown();
        try {
            closeFuture.get();
        } catch (InterruptedException | ExecutionException e) {
            throw new RuntimeException(e);
        }
        outputStreams.remove(key);
        saveExecutors.remove(key);
        if (lineMapWriter != null) {
            lineMapWriter.flush();
            lineMapWriter.close();
        }
    }

    //@formatter:off
    @Override public void saveFolder(String path) { }
    @Override public void copyFile(String source, String path, String entryName) { }
    @Override public void saveClassFile(String path, String qualifiedName, String entryName, String content, int[] mapping) { }
    @Override public void saveDirEntry(String path, String archiveName, String entryName) { }
    @Override public void copyEntry(String source, String path, String archiveName, String entry) { }
    //@formatter:on
}