1 /* 2 * Copyright (c) 2014, 2015, Dynatrace and/or its affiliates. All rights reserved. 3 * 4 * This file is part of the Lock Contention Tracing Subsystem for the HotSpot 5 * Virtual Machine, which is developed at Christian Doppler Laboratory on 6 * Monitoring and Evolution of Very-Large-Scale Software Systems. Please 7 * contact us at <http://mevss.jku.at/> if you need additional information 8 * or have any questions. 9 * 10 * This code is free software; you can redistribute it and/or modify it 11 * under the terms of the GNU General Public License version 2 only, as 12 * published by the Free Software Foundation. 13 * 14 * This code is distributed in the hope that it will be useful, but WITHOUT 15 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 16 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 17 * version 2 for more details (a copy is included in the LICENSE file that 18 * accompanied this code). 19 * 20 * You should have received a copy of the GNU General Public License version 21 * 2 along with this work. If not, see <http://www.gnu.org/licenses/>. 22 * 23 */ 24 package sun.evtracing.processing; 25 26 import static java.lang.System.err; 27 28 import java.lang.reflect.Method; 29 import java.lang.reflect.Modifier; 30 import java.util.HashMap; 31 32 public class Sanity { 33 34 private static final boolean PRINT_INDIVIDUAL_WARNINGS = Boolean.parseBoolean(System.getProperty("sun.evtracing.printIndividualWarnings")); 35 36 private static class Counter { 37 private int value = 0; 38 public void inc() { value++; } 39 public int get() { return value; } 40 } 41 private static HashMap<String, Counter> WARNINGS; 42 43 public static boolean isEnabled() { 44 boolean ea = false; 45 assert (ea = true); 46 return ea; 47 } 48 49 /** 50 * Non-failing assert for conditions that we expect to be true, but might be 51 * violated in rare cases, especially because of magic happening during VM 52 * startup. 53 */ 54 public static void warnIf(boolean condition, String format, Object... args) { 55 if (condition) { 56 warn(format, args); 57 } 58 } 59 60 /** 61 * Print a warning if assertions are enabled. 62 */ 63 public static void warn(String format, Object... args) { 64 if (isEnabled()) { 65 if (PRINT_INDIVIDUAL_WARNINGS) { 66 err.printf(format, args); 67 err.println(); 68 } else { 69 if (WARNINGS == null) { 70 WARNINGS = new HashMap<>(); 71 } 72 Counter ctr = WARNINGS.computeIfAbsent(format, f -> new Counter()); 73 ctr.inc(); 74 } 75 } 76 } 77 78 public static void printCollectedWarnings() { 79 if (WARNINGS != null) { 80 WARNINGS.entrySet().stream() 81 .sorted((x, y) -> y.getValue().get() - x.getValue().get()) 82 .forEach(e -> err.printf("%6d %s%n", e.getValue().get(), e.getKey())); 83 } 84 } 85 86 public static void assertNoInheritedAbstractMethods(Class<?> clazz) { 87 for (Method m : clazz.getMethods()) { 88 if (Modifier.isAbstract(m.getModifiers()) && !clazz.equals(m.getDeclaringClass())) { 89 throw new AssertionError("class must implement all abstract methods from superclasses", null); 90 } 91 } 92 } 93 }