1 /*
   2  * Copyright (c) 2005, 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,
  60                    new Fun(){void f(){ q.add("d"); }});
  61             equal(q.size(), 3);
  62             equal(q.toString(), "[c, b, a]");
  63             equal(q.peek(), "c");
  64             equal(q.element(), "c");
  65             equal(q.remove(), "c");
  66             equal(q.poll(), "b");
  67             equal(q.peek(), "a");
  68             equal(q.remove(), "a");
  69             THROWS(NoSuchElementException.class,
  70                    new Fun(){void f(){ q.remove(); }});
  71             equal(q.poll(), null);
  72             check(q.isEmpty());
  73             equal(q.size(), 0);
  74         } catch (Throwable t) { unexpected(t); }
  75     }
  76 
  77     //--------------------- Infrastructure ---------------------------
  78     static volatile int passed = 0, failed = 0;
  79     static void pass() {passed++;}
  80     static void fail() {failed++; Thread.dumpStack();}
  81     static void fail(String msg) {System.out.println(msg); fail();}
  82     static void unexpected(Throwable t) {failed++; t.printStackTrace();}
  83     static void check(boolean cond) {if (cond) pass(); else fail();}
  84     static void equal(Object x, Object y) {
  85         if (x == null ? y == null : x.equals(y)) pass();
  86         else fail(x + " not equal to " + y);}
  87     public static void main(String[] args) throws Throwable {
  88         try {realMain(args);} catch (Throwable t) {unexpected(t);}
  89         System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
  90         if (failed > 0) throw new AssertionError("Some tests failed");}
  91     static abstract class Fun { abstract void f() throws Throwable; }
  92     private static void THROWS(Class<? extends Throwable> k, Fun... fs) {
  93         for (Fun f : fs)
  94             try { f.f(); fail("Expected " + k.getName() + " not thrown"); }
  95             catch (Throwable t) {
  96                 if (k.isAssignableFrom(t.getClass())) pass();
  97                 else unexpected(t);}}
  98 }