1 /* 2 * Copyright (c) 2015, 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 8020968 27 * @summary Basic test for Stream<StackFrame> state 28 * @run main StackStreamState 29 */ 30 31 import java.lang.StackWalker.StackFrame; 32 import java.util.stream.Stream; 33 34 public class StackStreamState { 35 public static void main(String... args) { 36 StackStreamState test = new StackStreamState(); 37 test.testStatic(); 38 test.testInstance(); 39 test.testLocal(); 40 } 41 42 private static Stream<StackFrame> staticStream; 43 private Stream<StackFrame> instanceStream; 44 private final StackWalker walker = StackWalker.create(); 45 void testStatic() { 46 walker.walk(s -> { 47 staticStream = s; 48 return null; 49 }); 50 checkStreamState(staticStream); 51 } 52 void testInstance() { 53 walker.walk(s -> { 54 instanceStream = s; 55 return null; 56 }); 57 checkStreamState(instanceStream); 58 } 59 void testLocal() { 60 Stream<StackFrame> stream = walker.walk(s -> { 61 return s; 62 }); 63 checkStreamState(stream); 64 } 65 void checkStreamState(Stream<StackFrame> stream) { 66 try { 67 stream.count(); 68 throw new RuntimeException("IllegalStateException not thrown"); 69 } catch (IllegalStateException e) { 70 System.out.println("Got expected IllegalStateException: " + e.getMessage()); 71 e.printStackTrace(System.out); 72 } 73 } 74 }