MatrixTraceTransform主要逻辑在transform方法中

@Override
public void transform(TransformInvocation transformInvocation) throws TransformException, InterruptedException, IOException {
long start = System.currentTimeMillis()
//是否增量编译
final boolean isIncremental = transformInvocation.isIncremental() && this.isIncremental()
//transform的结果，重定向输出到这个目录
final File rootOutput = new File(project.matrix.output, "classes/${getName()}/")
if (!rootOutput.exists()) {
rootOutput.mkdirs()
}
final TraceBuildConfig traceConfig = initConfig()
Log.i("Matrix." + getName(), "[transform] isIncremental:%s rootOutput:%s", isIncremental, rootOutput.getAbsolutePath())
//获取Class混淆的mapping信息，存储到mappingCollector中
final MappingCollector mappingCollector = new MappingCollector()
File mappingFile = new File(traceConfig.getMappingPath());
if (mappingFile.exists() && mappingFile.isFile()) {
MappingReader mappingReader = new MappingReader(mappingFile);
mappingReader.read(mappingCollector)
}

Map<File, File> jarInputMap = new HashMap<>()
Map<File, File> scrInputMap = new HashMap<>()

transformInvocation.inputs.each { TransformInput input ->
input.directoryInputs.each { DirectoryInput dirInput ->
//收集、重定向目录中的class
collectAndIdentifyDir(scrInputMap, dirInput, rootOutput, isIncremental)
}
input.jarInputs.each { JarInput jarInput ->
if (jarInput.getStatus() != Status.REMOVED) {
//收集、重定向jar包中的class
collectAndIdentifyJar(jarInputMap, scrInputMap, jarInput, rootOutput, isIncremental)
}
}
}
//收集需要插桩的方法信息，每个插桩信息封装成TraceMethod对象
MethodCollector methodCollector = new MethodCollector(traceConfig, mappingCollector)
HashMap<String, TraceMethod> collectedMethodMap = methodCollector.collect(scrInputMap.keySet().toList(), jarInputMap.keySet().toList())
//执行插桩逻辑，在需要插桩方法的入口、出口添加MethodBeat的i/o逻辑
MethodTracer methodTracer = new MethodTracer(traceConfig, collectedMethodMap, methodCollector.getCollectedClassExtendMap(http://www.my516.com))
methodTracer.trace(scrInputMap, jarInputMap)
//执行原transform的逻辑；默认transformClassesWithDexBuilderForDebug这个task会将Class转换成Dex
origTransform.transform(transformInvocation)
Log.i("Matrix." + getName(), "[transform] cost time: %dms", System.currentTimeMillis() - start)
}