1 /* 2 * Copyright (c) 2005, 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 6301085 6192552 6365601 27 * @summary Basic tests for asLifoQueue 28 * @author Martin Buchholz 29 */ 30 31 import java.util.*; 32 import java.util.concurrent.*; 33 34 public class AsLifoQueue { 35 36 private static void realMain(String[] args) throws Throwable { 37 try { 38 Deque<String> deq = new ArrayDeque<String>(); 39 check(deq.addAll(Arrays.asList("b", "a", "c"))); 40 equal(deq.toString(), "[b, a, c]"); 41 check(deq.add("d")); 42 equal(deq.toString(), "[b, a, c, d]"); 43 Queue<String> q = Collections.asLifoQueue(deq); 44 check(q.add("e")); 45 equal(deq.toString(),"[e, b, a, c, d]"); 46 } catch (Throwable t) { unexpected(t); } 47 48 // Inspired by an excellent bug report by Jason Mehrens 49 try { 50 final Queue<String> q = 51 Collections.asLifoQueue(new LinkedBlockingDeque<String>(3)); 52 check(q.isEmpty()); equal(q.size(), 0); 53 check(q.add("a")); check(! q.isEmpty()); equal(q.size(), 1); 54 check(q.offer("b")); 55 check(q.add("c")); 56 equal(q.size(), 3); 57 check(! q.offer("d")); 58 equal(q.size(), 3); 59 THROWS(IllegalStateException.class, () -> q.add("d")); 60 equal(q.size(), 3); 61 equal(q.toString(), "[c, b, a]"); 62 equal(q.peek(), "c"); 63 equal(q.element(), "c"); 64 equal(q.remove(), "c"); 65 equal(q.poll(), "b"); 66 equal(q.peek(), "a"); 67 equal(q.remove(), "a"); 68 THROWS(NoSuchElementException.class, () -> q.remove()); 69 equal(q.poll(), null); 70 check(q.isEmpty()); 71 equal(q.size(), 0); 72 } catch (Throwable t) { unexpected(t); } 73 } 74 75 //--------------------- Infrastructure --------------------------- 76 static volatile int passed = 0, failed = 0; 77 static void pass() {passed++;} 78 static void fail() {failed++; Thread.dumpStack();} 79 static void fail(String msg) {System.out.println(msg); fail();} 80 static void unexpected(Throwable t) {failed++; t.printStackTrace();} 81 static void check(boolean cond) {if (cond) pass(); else fail();} 82 static void equal(Object x, Object y) { 83 if (x == null ? y == null : x.equals(y)) pass(); 84 else fail(x + " not equal to " + y);} 85 public static void main(String[] args) throws Throwable { 86 try {realMain(args);} catch (Throwable t) {unexpected(t);} 87 System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed); 88 if (failed > 0) throw new AssertionError("Some tests failed");} 89 @FunctionalInterface interface Fun {void f() throws Throwable;} 90 private static void THROWS(Class<? extends Throwable> k, Fun... fs) { 91 for (Fun f : fs) 92 try { f.f(); fail("Expected " + k.getName() + " not thrown"); } 93 catch (Throwable t) { 94 if (k.isAssignableFrom(t.getClass())) pass(); 95 else unexpected(t);}} 96 }