Remove AgentTestRunner custom classloader.
BytebuddyAgent install already handles class retransformation, make
the custom classloader redundant.
MODIFY
dd-java-agent/testing/src/main/java/dd/test/AgentTestRunner.java
dd-java-agent/testing/src/main/java/dd/test/AgentTestRunner.java
@@ -4,19 +4,12 @@ import com.datadoghq.agent.AgentInstaller;
import com.datadoghq.trace.DDTracer;
import com.datadoghq.trace.writer.ListWriter;
import io.opentracing.Tracer;
-import java.io.IOException;
import java.lang.instrument.ClassFileTransformer;
import java.lang.instrument.Instrumentation;
-import java.lang.reflect.Field;
import net.bytebuddy.agent.ByteBuddyAgent;
-import net.bytebuddy.dynamic.ClassFileLocator;
import org.junit.AfterClass;
import org.junit.Before;
import org.junit.BeforeClass;
-import org.junit.runner.RunWith;
-import org.junit.runner.notification.RunNotifier;
-import org.junit.runners.model.InitializationError;
-import org.spockframework.runtime.Sputnik;
import org.spockframework.runtime.model.SpecMetadata;
import spock.lang.Specification;
@@ -35,7 +28,6 @@ import spock.lang.Specification;
* in an initialized state.
* </ul>
*/
-@RunWith(AgentTestRunner.SpockRunner.class)
@SpecMetadata(filename = "AgentTestRunner.java", line = 0)
public abstract class AgentTestRunner extends Specification {
/**
@@ -75,76 +67,4 @@ public abstract class AgentTestRunner extends Specification {
instrumentation.removeTransformer(activeTransformer);
activeTransformer = null;
}
-
- // FIXME: Remove SpockRunner and custom classload logic
-
- public static class SpockRunner extends Sputnik {
- private final InstrumentationClassLoader customLoader;
-
- public SpockRunner(Class<?> clazz)
- throws InitializationError, NoSuchFieldException, SecurityException,
- IllegalArgumentException, IllegalAccessException {
- super(shadowTestClass(clazz));
- // access the classloader created in shadowTestClass above
- Field clazzField = Sputnik.class.getDeclaredField("clazz");
- try {
- clazzField.setAccessible(true);
- customLoader =
- (InstrumentationClassLoader) ((Class<?>) clazzField.get(this)).getClassLoader();
- } finally {
- clazzField.setAccessible(false);
- }
- }
-
- // Shadow the test class with bytes loaded by InstrumentationClassLoader
- private static Class<?> shadowTestClass(final Class<?> clazz) {
- try {
- InstrumentationClassLoader customLoader =
- new InstrumentationClassLoader(SpockRunner.class.getClassLoader());
- return customLoader.shadow(clazz);
- } catch (IOException e) {
- throw new IllegalStateException(e);
- }
- }
-
- // Replace the context class loader for each test with InstrumentationClassLoader
- @Override
- public void run(final RunNotifier notifier) {
- final ClassLoader contextLoader = Thread.currentThread().getContextClassLoader();
- try {
- Thread.currentThread().setContextClassLoader(customLoader);
- super.run(notifier);
- } finally {
- Thread.currentThread().setContextClassLoader(contextLoader);
- }
- }
- }
-
- /**
- * A ClassLoader which retransforms classes unseen by the installed agent. With the exception of
- * shadowed classes, this class
- */
- private static class InstrumentationClassLoader extends java.lang.ClassLoader {
- final ClassLoader parent;
-
- public InstrumentationClassLoader(ClassLoader parent) {
- super(parent);
- this.parent = parent;
- }
-
- /** Forcefully inject the bytes of clazz into this classloader. */
- public Class<?> shadow(Class<?> clazz) throws IOException {
- final ClassFileLocator locator = ClassFileLocator.ForClassLoader.of(clazz.getClassLoader());
- final byte[] classBytes = locator.locate(clazz.getName()).resolve();
-
- Class<?> shadowed = this.defineClass(clazz.getName(), classBytes, 0, classBytes.length);
- return shadowed;
- }
-
- @Override
- protected Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException {
- // TODO: If already loaded and not seen by agent: do a retransform.
- return parent.loadClass(name);
- }
- }
}

Remove AgentTestRunner custom classloader.

BytebuddyAgent install already handles class retransformation, make
the custom classloader redundant.