Github user chtyim commented on a diff in the pull request:
https://github.com/apache/twill/pull/51#discussion_r109512583
--- Diff:
twill-yarn/src/test/java/org/apache/twill/yarn/CustomClassLoader.java ---
@@ -0,0 +1,87 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you 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 org.apache.twill.yarn;
+
+import org.apache.twill.api.ServiceAnnouncer;
+import org.apache.twill.common.Cancellable;
+import org.objectweb.asm.ClassWriter;
+import org.objectweb.asm.Opcodes;
+import org.objectweb.asm.Type;
+import org.objectweb.asm.commons.GeneratorAdapter;
+import org.objectweb.asm.commons.Method;
+
+import java.net.URL;
+import java.net.URLClassLoader;
+
+/**
+ * ClassLoader that generates a new class for the {@link
CustomClassLoaderTestRun}.
+ */
+public final class CustomClassLoader extends URLClassLoader {
+
+ public CustomClassLoader(URL[] urls, ClassLoader parent) {
+ super(urls, parent);
+ }
+
+ @Override
+ protected Class<?> findClass(String name) throws ClassNotFoundException {
+ if (!CustomClassLoaderRunnable.GENERATED_CLASS_NAME.equals(name)) {
+ return super.findClass(name);
+ }
+
+ // Generate a class that look like this:
+ //
+ // public class Generated {
+ //
+ // public void announce(ServiceAnnouncer announcer, String
serviceName, int port) {
--- End diff --
actually the comment is correct. The generated method has `void` return
type. The `announcer.announce` method has `Cancellable` return type, but the
result gets ignored (hence the `mg.pop()` code in line 79).
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