TestNonSerializableLambdaNameStability.java revision 2761:d386dce997f6
1/* 2 * Copyright (c) 2014, 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. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24/* 25 * @test 26 * @bug 8067422 27 * @summary Check that the lambda names are not unnecessarily unstable 28 * @library /tools/lib 29 * @build ToolBox 30 * @run main TestNonSerializableLambdaNameStability 31 */ 32 33import com.sun.tools.classfile.ClassFile; 34import com.sun.tools.classfile.Method; 35import java.io.ByteArrayInputStream; 36import java.io.InputStream; 37import java.util.ArrayList; 38import java.util.List; 39import javax.tools.StandardLocation; 40 41public class TestNonSerializableLambdaNameStability { 42 43 public static void main(String... args) throws Exception { 44 new TestNonSerializableLambdaNameStability().run(); 45 } 46 47 String lambdaSource = "public class L%d {\n" + 48 " public static class A {\n" + 49 " private Runnable r = () -> { };\n" + 50 " }\n" + 51 " public static class B {\n" + 52 " private Runnable r = () -> { };\n" + 53 " }\n" + 54 " private Runnable r = () -> { };\n" + 55 "}\n"; 56 57 String expectedLambdaMethodName = "lambda$new$0"; 58 59 void run() throws Exception { 60 List<String> sources = new ArrayList<>(); 61 62 for (int i = 0; i < 3; i++) { 63 sources.add(String.format(lambdaSource, i)); 64 } 65 66 ToolBox tb = new ToolBox(); 67 68 try (ToolBox.MemoryFileManager fm = new ToolBox.MemoryFileManager()) { 69 tb.new JavacTask() 70 .sources(sources.toArray(new String[sources.size()])) 71 .fileManager(fm) 72 .run(); 73 74 for (String file : fm.files.get(StandardLocation.CLASS_OUTPUT).keySet()) { 75 byte[] fileBytes = fm.getFileBytes(StandardLocation.CLASS_OUTPUT, file); 76 try (InputStream in = new ByteArrayInputStream(fileBytes)) { 77 boolean foundLambdaMethod = false; 78 ClassFile cf = ClassFile.read(in); 79 StringBuilder seenMethods = new StringBuilder(); 80 String sep = ""; 81 for (Method m : cf.methods) { 82 String methodName = m.getName(cf.constant_pool); 83 if (expectedLambdaMethodName.equals(methodName)) { 84 foundLambdaMethod = true; 85 break; 86 } 87 seenMethods.append(sep); 88 seenMethods.append(methodName); 89 sep = ", "; 90 } 91 92 if (!foundLambdaMethod) { 93 throw new AbstractMethodError("Did not find the lambda method, " + 94 "found methods: " + seenMethods.toString()); 95 } 96 } 97 } 98 } 99 } 100} 101