| /* |
| * 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.beam.runners.dataflow.worker; |
| |
| import static org.junit.Assert.assertFalse; |
| |
| import java.lang.reflect.Field; |
| import java.lang.reflect.Modifier; |
| import java.util.ArrayList; |
| import java.util.HashSet; |
| |
| /** Static helpers for testing Windmill state. */ |
| public class WindmillStateTestUtils { |
| /** |
| * Assert that no field (including compiler-generated fields) within {@code obj} point back to a |
| * non-null instance of (a subclass of) {@code clazz}. |
| */ |
| public static void assertNoReference(Object obj, Class<?> clazz) throws Exception { |
| assertNoReference(obj, clazz, new ArrayList<String>(), new HashSet<Object>()); |
| } |
| |
| public static void assertNoReference( |
| Object obj, Class<?> clazz, ArrayList<String> path, HashSet<Object> visited) |
| throws Exception { |
| if (obj == null || visited.contains(obj)) { |
| return; |
| } |
| Class<?> thisClazz = obj.getClass(); |
| assertFalse( |
| "Found invalid path " + path + " back to " + clazz.getName(), |
| clazz.isAssignableFrom(thisClazz)); |
| |
| visited.add(obj); |
| if (obj instanceof Object[]) { |
| Object[] arr = (Object[]) obj; |
| for (int i = 0; i < arr.length; i++) { |
| try { |
| path.add(thisClazz.getName() + "[" + i + "]"); |
| assertNoReference(arr[i], clazz, path, visited); |
| } finally { |
| path.remove(path.size() - 1); |
| } |
| } |
| } else { |
| Class<?> currClazz = thisClazz; |
| while (currClazz != null) { |
| for (Field f : currClazz.getDeclaredFields()) { |
| if (Modifier.isStatic(f.getModifiers())) { |
| continue; |
| } |
| |
| boolean accessible = f.isAccessible(); |
| try { |
| f.setAccessible(true); |
| path.add(thisClazz.getName() + "#" + f.getName()); |
| assertNoReference(f.get(obj), clazz, path, visited); |
| } finally { |
| path.remove(path.size() - 1); |
| f.setAccessible(accessible); |
| } |
| } |
| currClazz = currClazz.getSuperclass(); |
| } |
| } |
| } |
| } |