1 /* 2 * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 package java.util.stream; 26 27 import java.util.logging.Level; 28 import java.util.logging.Logger; 29 30 /** 31 * Utility class for detecting inadvertent uses of boxing in 32 * {@code java.util.stream} classes. The detection is turned on or off based on 33 * whether the system property {@code org.openjdk.java.util.stream.tripwire} is 34 * considered {@code true} according to {@link Boolean#getBoolean(String)}. 35 * Turned off for production. 36 * 37 * @apiNote 38 * Typical usage would be for boxing code to do: 39 * <pre> 40 * if (Tripwire.enabled) 41 * Tripwire.trip(getClass(), "{0} calling Sink.OfInt.accept(Integer)"); 42 * </pre> 43 * 44 * @since 1.8 45 */ 46 final class Tripwire { 47 private static final String TRIPWIRE_PROPERTY = "org.openjdk.java.util.stream.tripwire"; 48 49 /** Should debugging checks be enabled? */ 50 static final boolean ENABLED = true; 51 // = Boolean.getBoolean(TRIPWIRE_PROPERTY); 52 53 private Tripwire() { } 54 55 /** 56 * Produces a log warning, using {@code Logger.getLogger(className)}, using 57 * the supplied message. The class name of {@code trippingClass} will be 58 * used as the first parameter to the message. 59 * 60 * @param trippingClass Name of the class generating the message 61 * @param msg A message format string of the type expected by {@link Logger} 62 */ 63 static void trip(Class<?> trippingClass, String msg) { 64 Logger.getLogger(trippingClass.getName()).log(Level.WARNING, msg, trippingClass.getName()); 65 } 66 }