Java tutorial
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We also recommend that a * file or class name and description of purpose be included on the * same "printed page" as the copyright notice for easier * identification within third-party archives. * * Copyright 2016 Alibaba Group * * Licensed 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 com.taobao.android.builder.tools.multidex.dex; import com.android.dex.Dex; import com.android.dex.DexIndexOverflowException; import com.android.dx.command.dexer.DxContext; import com.android.dx.merge.CollisionPolicy; import com.taobao.android.builder.extension.MultiDexConfig; import com.taobao.android.builder.tools.concurrent.ExecutorServicesHelper; import com.taobao.android.builder.tools.multidex.FastMultiDexer; import org.apache.commons.lang.StringUtils; import org.gradle.api.GradleException; import org.jetbrains.annotations.NotNull; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import java.io.File; import java.io.IOException; import java.util.*; import java.util.stream.Collectors; /** * Created by wuzhong on 2017/5/31. */ public class DexMerger { public static final String FASTMAINDEX_JAR = "fastmaindex"; private static Logger logger = LoggerFactory.getLogger(DexMerger.class); private MultiDexConfig multiDexConfig; private List<File> fileList; private LinkedHashMap<File, Dex> jarDexMap = new LinkedHashMap<>(); public List<Dex> dexList = new ArrayList<>(); public DexMerger(MultiDexConfig multiDexConfig, Collection<File> fileList) throws IOException { this.multiDexConfig = multiDexConfig; this.fileList = fileList.stream().sorted(new FileComparator()).collect(Collectors.toList()); for (File file : fileList) { Dex dex = new Dex(file); jarDexMap.put(file, dex); } dexList = new ArrayList<>(jarDexMap.values()); } public DexMerger(MultiDexConfig multiDexConfig, Map<File, Dex> fileDexMap) { this.multiDexConfig = multiDexConfig; this.fileList = fileDexMap.keySet().stream().sorted(new FileComparator()).collect(Collectors.toList()); for (File file : fileList) { Dex dex = fileDexMap.get(file); jarDexMap.put(file, dex); } dexList = new ArrayList<>(jarDexMap.values()); } public List<DexGroup> group() { List<DexGroup> dexGroupList = new ArrayList<>(); addDexByRule(dexGroupList); addDexLimited(dexGroupList, true); return dexGroupList; } public void executeMerge(File outDexFolder, List<DexGroup> dexGroupList) { ExecutorServicesHelper executorServicesHelper = new ExecutorServicesHelper("dexmerge", LoggerFactory.getLogger(FastMultiDexer.class), dexGroupList.size()); List<Runnable> runnables = new ArrayList<>(dexGroupList.size()); Dex[] mergedList = new Dex[dexGroupList.size()]; for (int i = 0; i < dexGroupList.size(); i++) { final List<Dex> dexes = dexGroupList.get(i).dexs; final int index = i; runnables.add(new Runnable() { @Override public void run() { try { mergeDex(outDexFolder, dexes, index, mergedList); } catch (Throwable e) { throw new GradleException(e.getMessage(), e); } } }); } try { executorServicesHelper.execute(runnables); } catch (InterruptedException e) { throw new GradleException(e.getMessage(), e); } if (!dexList.isEmpty()) { mergeSmallDexs(outDexFolder, mergedList); } } private void mergeSmallDexs(File outDexFolder, Dex[] mergedList) { List<DexGroup> dexGroupList = new ArrayList<>(); for (int i = 0; i < mergedList.length; i++) { DexGroup dexGroup = new DexGroup(); dexGroup.firstDex = (0 == i); dexGroup.addDex(mergedList[i]); dexGroupList.add(i, dexGroup); } addDexLimited(dexGroupList, false); executeMerge(outDexFolder, dexGroupList); } private void mergeDex(File outDexFolder, List<Dex> tmpList, int index, Dex[] mergedList) throws IOException { com.android.dx.merge.DexMerger dexMerger = new com.android.dx.merge.DexMerger(tmpList.toArray(new Dex[0]), CollisionPolicy.KEEP_FIRST, new DxContext()); dexMerger.setCompactWasteThreshold(1024); Dex dex = dexMerger.merge(); mergedList[index] = dex; if (dexList.isEmpty()) { logger.warn("dexCount of {}, methods {} , fields {}", index, dex.getTableOfContents().methodIds.size, dex.getTableOfContents().fieldIds.size); String name = "classes" + (0 == index ? "" : String.valueOf(index + 1)) + ".dex"; File dexFile = new File(outDexFolder, name); dex.writeTo(dexFile); } } private void addDexByRule(List<DexGroup> dexDtos) { DexGroup fistDto = new DexGroup(); fistDto.firstDex = (true); dexDtos.add(0, fistDto); for (File file : fileList) { if (file.getParentFile().getName().startsWith(FASTMAINDEX_JAR)) { logger.warn(String.format("add %s to first dex!", file.getAbsolutePath())); Dex dex = jarDexMap.get(file); fistDto.addDex(dex); dexList.remove(dex); } } if (StringUtils.isEmpty(multiDexConfig.getDexSplitRules())) { return; } String[] rules = multiDexConfig.getDexSplitRules().split(";"); for (int i = 0; i < rules.length; i++) { DexGroup dexDto = null; if (0 == i) { dexDto = fistDto; } else { dexDto = new DexGroup(); dexDtos.add(i, dexDto); } String rule = rules[i]; if (StringUtils.isEmpty(rule)) { continue; } String[] items = rule.split(","); for (File file : fileList) { if (match(items, file) || (0 == i && file.getAbsolutePath().contains(FASTMAINDEX_JAR))) { logger.warn("FASTMULTIDEX put file " + file.getAbsolutePath() + " to dex " + i); Dex dex = jarDexMap.get(file); if (!dexDto.addDex(dex)) { throw new DexIndexOverflowException(file.getAbsolutePath() + " can't add to dex" + i); } dexList.remove(dex); } } } } private void addDexLimited(List<DexGroup> dexDtos, boolean limited) { int dexCount = multiDexConfig.getDexCount(); if (dexCount == 0) { dexCount = Integer.MAX_VALUE; } int index = 0; DexGroup dexDto = getDexDto(dexDtos, index); for (Dex dex : new ArrayList<>(dexList)) { //If you can't join in, you need to re-extend a dex while (!dexDto.addDex(dex)) { if (limited && index >= dexCount) { return; } dexDto = getDexDto(dexDtos, index++); } dexList.remove(dex); } } @NotNull private DexGroup getDexDto(List<DexGroup> dexDtos, int index) { if (dexDtos.size() <= index) { DexGroup dexDto = new DexGroup(); dexDtos.add(index, dexDto); return dexDto; } DexGroup dexDto = dexDtos.get(index); if (null == dexDto) { dexDto = new DexGroup(); if (index == 0) { dexDto.firstDex = true; } dexDtos.add(index, dexDto); } return dexDto; } private boolean match(String[] items, File file) { for (String artiId : items) { if (file.getParentFile().getName().contains(artiId)) { return true; } } return false; } }