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 6215625
  27  * @summary Check correct behavior when last element is removed.
  28  * @author Martin Buchholz
  29  */
  30 
  31 import java.util.*;
  32 import java.util.concurrent.*;
  33 
  34 public class LastElement {
  35     void test(String[] args) throws Throwable {
  36         testQueue(new LinkedBlockingQueue<Integer>());
  37         testQueue(new LinkedBlockingDeque<Integer>());
  38         testQueue(new ArrayBlockingQueue<Integer>(10, true));
  39         testQueue(new ArrayBlockingQueue<Integer>(10, false));
  40         testQueue(new LinkedTransferQueue<Integer>());
  41 
  42         System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
  43         if (failed > 0) throw new Exception("Some tests failed");
  44     }
  45 
  46     void testQueue(BlockingQueue<Integer> q) throws Throwable {
  47         Integer one = 1;
  48         Integer two = 2;
  49         Integer three = 3;
  50 
  51         // remove(Object)
  52         q.put(one);
  53         q.put(two);
  54         check(! q.isEmpty() && q.size() == 2);
  55         check(q.remove(one));
  56         check(q.remove(two));
  57         check(q.isEmpty() && q.size() == 0);
  58         q.put(three);
  59         try {check(q.take() == three);}
  60         catch (Throwable t) {unexpected(t);}
  61         check(q.isEmpty() && q.size() == 0);

  62 
  63         // iterator().remove()
  64         q.clear();
  65         q.put(one);
  66         check(q.offer(two));
  67         check(! q.isEmpty() && q.size() == 2);
  68         Iterator<Integer> i = q.iterator();
  69         check(i.next() == one);
  70         i.remove();
  71         check(i.next() == two);
  72         i.remove();
  73         check(q.isEmpty() && q.size() == 0);
  74         q.put(three);
  75         try {check(q.take() == three);}
  76         catch (Throwable t) {unexpected(t);}
  77         check(q.isEmpty() && q.size() == 0);
  78     }
  79 




















  80     //--------------------- Infrastructure ---------------------------
  81     volatile int passed = 0, failed = 0;
  82     void pass() {passed++;}
  83     void fail() {failed++; Thread.dumpStack();}
  84     void fail(String msg) {System.err.println(msg); fail();}
  85     void unexpected(Throwable t) {failed++; t.printStackTrace();}
  86     void check(boolean cond) {if (cond) pass(); else fail();}
  87     void equal(Object x, Object y) {
  88         if (x == null ? y == null : x.equals(y)) pass();
  89         else fail(x + " not equal to " + y);}
  90     public static void main(String[] args) throws Throwable {
  91         new LastElement().instanceMain(args);}
  92     public void instanceMain(String[] args) throws Throwable {
  93         try {test(args);} catch (Throwable t) {unexpected(t);}
  94         System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
  95         if (failed > 0) throw new AssertionError("Some tests failed");}
  96 }
--- EOF ---