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/* |
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* Copyright (c) 2006, 2010, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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|
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/* |
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* @test |
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* @bug 6360946 6360948 |
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* @summary Test various operations on concurrently mutating collections |
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* @author Martin Buchholz |
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*/ |
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|
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import static java.util.Collections.*; |
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import java.util.*; |
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import java.util.concurrent.*; |
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|
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public class RacingCollections { |
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/** |
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* How long to run each "race" (in milliseconds). |
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* Turn this up to some higher value like 1000 for stress testing: |
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* java -Dmillis=1000 RacingCollections |
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*/ |
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static final long defaultWorkTimeMillis = Long.getLong("millis", 10L); |
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|
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/** |
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* Whether to print debug information. |
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*/ |
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static final boolean debug = Boolean.getBoolean("debug"); |
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|
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static final Integer one = 1; |
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static final Integer two = 2; |
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|
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/** |
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* A thread that mutates an object forever, alternating between |
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* being empty and containing singleton "two" |
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*/ |
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static class Frobber extends CheckedThread { |
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volatile boolean done = false; |
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boolean keepGoing(int i) { return (i % 128 != 0) || ! done; } |
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|
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final Object elLoco; |
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Frobber(Object elLoco) { |
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this.elLoco = elLoco; |
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this.start(); |
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} |
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|
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@SuppressWarnings("unchecked") |
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void clear(Object o) { |
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if (o instanceof Collection) |
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((Collection<?>)o).clear(); |
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else |
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((Map<?,?>)o).clear(); |
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} |
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|
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@SuppressWarnings("unchecked") |
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void realRun() { |
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// Mutate elLoco wildly forever, checking occasionally for "done" |
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clear(elLoco); |
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if (elLoco instanceof List) { |
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List<Integer> l = (List<Integer>) elLoco; |
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for (int i = 0; keepGoing(i); i++) { |
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switch (i%2) { |
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case 0: l.add(two); break; |
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case 1: l.add(0, two); break; |
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} |
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switch (i%2) { |
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case 0: l.remove(two); break; |
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case 1: l.remove(0); break; |
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}}} |
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else if (elLoco instanceof Deque) { |
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Deque<Integer> q = (Deque<Integer>) elLoco; |
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for (int i = 0; keepGoing(i); i++) { |
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switch (i%6) { |
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case 0: q.add(two); break; |
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case 1: q.addFirst(two); break; |
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case 2: q.addLast(two); break; |
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case 3: q.offer(two); break; |
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case 4: q.offerFirst(two); break; |
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case 5: q.offerLast(two); break; |
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} |
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switch (i%6) { |
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case 0: q.remove(two); break; |
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case 1: q.removeFirst(); break; |
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case 2: q.removeLast(); break; |
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case 3: q.poll(); break; |
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case 4: q.pollFirst(); break; |
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case 5: q.pollLast(); break; |
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}}} |
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else if (elLoco instanceof Queue) { |
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Queue<Integer> q = (Queue<Integer>) elLoco; |
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for (int i = 0; keepGoing(i); i++) { |
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switch (i%2) { |
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case 0: q.add(two); break; |
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case 1: q.offer(two); break; |
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} |
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switch (i%2) { |
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case 0: q.remove(two); break; |
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case 1: q.poll(); break; |
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}}} |
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else if (elLoco instanceof Map) { |
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Map<Integer, Boolean> m = (Map<Integer, Boolean>) elLoco; |
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for (int i = 0; keepGoing(i); i++) { |
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m.put(two, true); |
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m.remove(two); |
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}} |
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else if (elLoco instanceof Collection) { |
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Collection<Integer> c = (Collection<Integer>) elLoco; |
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for (int i = 0; keepGoing(i); i++) { |
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c.add(two); |
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c.remove(two); |
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}} |
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else { throw new Error("Huh? " + elLoco); } |
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} |
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|
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void enoughAlready() { |
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done = true; |
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try { join(); } catch (Throwable t) { unexpected(t); } |
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} |
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} |
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|
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private static void checkEqualSanity(Object theRock, Object elLoco) { |
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//equal(theRock, theRock); |
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equal(elLoco, elLoco); |
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|
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// It would be nice someday to have theRock and elLoco never "equal", |
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// although the meaning of "equal" for mutating collections |
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// is a bit fuzzy. Uncomment when/if we fix: |
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// 6374942: Improve thread safety of collection .equals() methods |
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//notEqual(theRock, elLoco); |
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//notEqual(elLoco, theRock); |
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|
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notEqual(theRock.toString(), elLoco.toString()); |
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} |
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|
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static class Looper { |
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final long quittingTime; |
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int i = 0; |
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Looper() { this(defaultWorkTimeMillis); } |
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Looper(long workTimeMillis) { |
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quittingTime = System.nanoTime() + workTimeMillis * 1024 * 1024; |
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} |
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boolean keepGoing() { |
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return (i++ % 128 != 0) || (System.nanoTime() - quittingTime < 0); |
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} |
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} |
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|
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private static void frob(Object theRock, Object elLoco) { |
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Frobber frobber = new Frobber(elLoco); |
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try { |
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if (theRock instanceof Collection) { |
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@SuppressWarnings("unchecked") |
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Collection<Integer> c = (Collection<Integer>) theRock; |
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if (! c.contains(one)) |
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c.add(one); |
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} else { |
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@SuppressWarnings("unchecked") |
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Map<Integer, Boolean> m = (Map<Integer, Boolean>) theRock; |
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if (! m.containsKey(one)) |
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m.put(one, true); |
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} |
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for (Looper looper = new Looper(); looper.keepGoing(); ) |
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checkEqualSanity(theRock, elLoco); |
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} |
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catch (Throwable t) { unexpected(t); } |
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finally { frobber.enoughAlready(); } |
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} |
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|
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private static List<Map<Integer, Boolean>> newConcurrentMaps() { |
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List<Map<Integer, Boolean>> list = new ArrayList<>(); |
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list.add(new ConcurrentHashMap<Integer, Boolean>()); |
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list.add(new ConcurrentSkipListMap<Integer, Boolean>()); |
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return list; |
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} |
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|
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private static List<Map<Integer, Boolean>> maps() { |
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List<Map<Integer, Boolean>> list = newConcurrentMaps(); |
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list.add(new Hashtable<Integer, Boolean>()); |
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list.add(new HashMap<Integer, Boolean>()); |
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list.add(new TreeMap<Integer, Boolean>()); |
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Comparator<Integer> cmp = new Comparator<>() { |
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public int compare(Integer x, Integer y) { |
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return x - y; |
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}}; |
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list.add(new TreeMap<Integer, Boolean>(Collections.reverseOrder(cmp))); |
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return list; |
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} |
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|
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private static List<Set<Integer>> newConcurrentSets() { |
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List<Set<Integer>> list = new ArrayList<>(); |
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list.add(new ConcurrentSkipListSet<Integer>()); |
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list.add(new CopyOnWriteArraySet<Integer>()); |
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return list; |
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} |
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|
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private static List<Set<Integer>> newSets() { |
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List<Set<Integer>> list = newConcurrentSets(); |
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list.add(new HashSet<Integer>()); |
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list.add(new TreeSet<Integer>()); |
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list.add(new TreeSet<Integer>(Collections.reverseOrder())); |
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return list; |
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} |
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|
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private static List<List<Integer>> newConcurrentLists() { |
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List<List<Integer>> list = new ArrayList<>(); |
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list.add(new CopyOnWriteArrayList<Integer>()); |
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return list; |
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} |
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|
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private static List<List<Integer>> newLists() { |
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List<List<Integer>> list = newConcurrentLists(); |
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list.add(new Vector<Integer>()); |
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list.add(new ArrayList<Integer>()); |
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return list; |
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} |
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|
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private static List<Queue<Integer>> newConcurrentQueues() { |
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List<Queue<Integer>> list = new ArrayList<>(newConcurrentDeques()); |
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list.add(new ArrayBlockingQueue<Integer>(10)); |
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list.add(new LinkedBlockingQueue<Integer>(10)); |
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list.add(new LinkedTransferQueue<Integer>()); |
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list.add(new ConcurrentLinkedQueue<Integer>()); |
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return list; |
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} |
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|
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private static List<Queue<Integer>> newQueues() { |
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List<Queue<Integer>> list = new ArrayList<>(newDeques()); |
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list.add(new LinkedBlockingQueue<Integer>(10)); |
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return list; |
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} |
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|
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private static List<Deque<Integer>> newConcurrentDeques() { |
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List<Deque<Integer>> list = new ArrayList<>(); |
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list.add(new LinkedBlockingDeque<Integer>(10)); |
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list.add(new ConcurrentLinkedDeque<Integer>()); |
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return list; |
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} |
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|
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private static List<Deque<Integer>> newDeques() { |
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List<Deque<Integer>> list = newConcurrentDeques(); |
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list.add(new ArrayDeque<Integer>()); |
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list.add(new LinkedList<Integer>()); |
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return list; |
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} |
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|
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private static void describe(Class<?> k, Object x, Object y) { |
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if (debug) |
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System.out.printf("%s: %s, %s%n", k.getSimpleName(), |
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x.getClass().getSimpleName(), |
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y.getClass().getSimpleName()); |
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} |
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|
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private static void realMain(String[] args) { |
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for (Map<Integer, Boolean> x : maps()) |
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for (Map<Integer, Boolean> y : newConcurrentMaps()) { |
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describe(Map.class, x, y); |
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x.put(one, true); |
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frob(x, y); |
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frob(unmodifiableMap(x), y); |
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frob(synchronizedMap(x), y); |
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frob(x, synchronizedMap(y)); |
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frob(checkedMap(x, Integer.class, Boolean.class), y); |
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frob(x, checkedMap(y, Integer.class, Boolean.class)); |
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x.clear(); |
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frob(newSetFromMap(x), newSetFromMap(y)); |
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frob(x.keySet(), newSetFromMap(y)); |
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} |
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|
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for (Set<Integer> x : newSets()) |
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for (Set<Integer> y : newConcurrentSets()) { |
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describe(Set.class, x, y); |
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frob(x, y); |
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frob(unmodifiableSet(x), y); |
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frob(synchronizedSet(x), y); |
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frob(x, synchronizedSet(y)); |
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frob(checkedSet(x, Integer.class), y); |
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frob(x, checkedSet(y, Integer.class)); |
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} |
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|
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for (List<Integer> x : newLists()) |
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for (List<Integer> y : newConcurrentLists()) { |
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describe(List.class, x, y); |
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frob(x, y); |
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frob(unmodifiableList(x), y); |
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frob(synchronizedList(x), y); |
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frob(x, synchronizedList(y)); |
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frob(checkedList(x, Integer.class), y); |
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frob(x, checkedList(y, Integer.class)); |
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} |
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|
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for (Queue<Integer> x : newQueues()) |
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for (Queue<Integer> y : newConcurrentQueues()) { |
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describe(Queue.class, x, y); |
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frob(x, y); |
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} |
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|
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for (Deque<Integer> x : newDeques()) |
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for (Deque<Integer> y : newConcurrentDeques()) { |
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describe(Deque.class, x, y); |
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frob(asLifoQueue(x), y); |
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frob(x, asLifoQueue(y)); |
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} |
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} |
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|
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//--------------------- Infrastructure --------------------------- |
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static volatile int passed = 0, failed = 0; |
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static void pass() {passed++;} |
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static void fail() {failed++; Thread.dumpStack();} |
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static void fail(String msg) {System.out.println(msg); fail();} |
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static void unexpected(Throwable t) {failed++; t.printStackTrace();} |
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static void check(boolean cond) {if (cond) pass(); else fail();} |
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static String toString(Object x) { |
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return ((x instanceof Collection) || (x instanceof Map)) ? |
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x.getClass().getName() : x.toString();} |
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static void equal(Object x, Object y) { |
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if (x == null ? y == null : x.equals(y)) pass(); |
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else fail(toString(x) + " not equal to " + toString(y));} |
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static void notEqual(Object x, Object y) { |
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if (x == null ? y == null : x.equals(y)) |
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fail(toString(x) + " equal to " + toString(y)); |
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else pass();} |
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public static void main(String[] args) throws Throwable { |
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try {realMain(args);} catch (Throwable t) {unexpected(t);} |
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System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed); |
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if (failed > 0) throw new AssertionError("Some tests failed");} |
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private abstract static class CheckedThread extends Thread { |
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abstract void realRun() throws Throwable; |
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public void run() { |
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try { realRun(); } catch (Throwable t) { unexpected(t); }}} |
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} |
