@Override
public void configurationChanged() {
if (started.get()) {
if (configuration.isFilterChanged()) {
List<ClassInfo> deltas = context.buildDeltaList();
if (deltas != null && !deltas.isEmpty()) {
for (ClassInfo classInfo : deltas) {
if (configuration.isAsyncTransformation()) {
try {
blockingQueue.put(classInfo.getOriginalClass());
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
break;
}
} else {
try {
instrumentation.retransformClasses(new Class[] {classInfo.getOriginalClass()});
} catch (Throwable e) {
LOG.error("Could not transform " + classInfo.getClassName(), e);
}
}
}
if (configuration.isAsyncTransformation() && !blockingQueue.isEmpty()) {
startTransformThread();
}
}
}
}
}
@Override
public byte[] transform(
ClassLoader loader,
String className,
Class<?> classBeingRedefined,
ProtectionDomain protectionDomain,
byte[] classfileBuffer)
throws IllegalClassFormatException {
byte[] buffer = null;
ClassInfo classInfo = context.getClassInfo(className);
classInfo.setOriginalClass(classBeingRedefined);
if (classInfo.getTransformed() == null) {
// we haven't been transformed before
classInfo.setOriginal(classfileBuffer);
}
if (!cleanUp.get()) {
byte[] classBufferToRedefine = classInfo.getOriginal();
if (configuration.isAudit(className)) {
if (classInfo.isTransformed()) {
// remove metrics from methods no longer defined
context.resetMethods(classInfo);
}
ClassReader cr = new ClassReader(classBufferToRedefine);
ClassWriter cw = new ClassWriter(cr, ClassWriter.COMPUTE_MAXS | ClassWriter.COMPUTE_FRAMES);
ApmClassVisitor visitor = new ApmClassVisitor(this, cw, classInfo);
cr.accept(visitor, ClassReader.SKIP_FRAMES);
buffer = cw.toByteArray();
if (!verifyClass(className, buffer)) {
classInfo.setCanTransform(false);
buffer = null;
}
classInfo.setTransformed(buffer);
}
} else {
if (classInfo.getOriginal() != null) {
buffer = classInfo.getOriginal();
context.resetAll(classInfo);
}
}
return buffer;
}