/*
* Copyright ( c ) 2006 , 2014 , Oracle and / or its affiliates . All rights reserved .
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER .
*
* This code is free software ; you can redistribute it and / or modify it
* under the terms of the GNU General Public License version 2 only , as
* published by the Free Software Foundation .
*
* This code is distributed in the hope that it will be useful , but WITHOUT
* ANY WARRANTY ; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE . See the GNU General Public License
* version 2 for more details ( a copy is included in the LICENSE file that
* accompanied this code ) .
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work ; if not , write to the Free Software Foundation ,
* Inc . , 51 Franklin St , Fifth Floor , Boston , MA 02110 - 1301 USA .
*
* Please contact Oracle , 500 Oracle Parkway , Redwood Shores , CA 94065 USA
* or visit www . oracle . com if you need additional information or have any
* questions .
*/
/*
* @ test
* @ bug 6415641 6377302
* @ summary Concurrent collections are permitted to lie about their size
* @ author Martin Buchholz
*/
import java.util.Arrays;
import java.util.Collection;
import java.util.Map;
import java.util.NavigableMap;
import java.util.NavigableSet;
import java.util.Objects;
import java.util.Random;
import java.util.Set;
import java.util.TreeSet;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentLinkedDeque;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.ConcurrentSkipListMap;
import java.util.concurrent.ConcurrentSkipListSet;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.CopyOnWriteArraySet;
import java.util.concurrent.LinkedBlockingDeque;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.LinkedTransferQueue;
import java.util.concurrent.PriorityBlockingQueue;
@SuppressWarnings("unchecked" )
public class BiggernYours {
static final Random rnd = new Random(18675309 );
static void compareCollections(Collection c1, Collection c2) {
Object[] c1Array = c1.toArray();
Object[] c2Array = c2.toArray();
check(c1Array.length == c2Array.length);
for (Object aC1 : c1Array) {
boolean found = false ;
for (Object aC2 : c2Array) {
if (Objects.equals(aC1, aC2)) {
found = true ;
break ;
}
}
if (!found)
fail(aC1 + " not found in " + Arrays.toString(c2Array));
}
}
static void compareMaps(Map m1, Map m2) {
compareCollections(m1.keySet(),
m2.keySet());
compareCollections(m1.values(),
m2.values());
compareCollections(m1.entrySet(),
m2.entrySet());
}
static void compareNavigableMaps(NavigableMap m1, NavigableMap m2) {
compareMaps(m1, m2);
compareMaps(m1.descendingMap(),
m2.descendingMap());
compareMaps(m1.tailMap(Integer.MIN_VALUE),
m2.tailMap(Integer.MIN_VALUE));
compareMaps(m1.headMap(Integer.MAX_VALUE),
m2.headMap(Integer.MAX_VALUE));
}
static void compareNavigableSets(NavigableSet s1, NavigableSet s2) {
compareCollections(s1, s2);
compareCollections(s1.descendingSet(),
s2.descendingSet());
compareCollections(s1.tailSet(Integer.MIN_VALUE),
s2.tailSet(Integer.MIN_VALUE));
}
abstract static class MapFrobber { abstract void frob(Map m); }
abstract static class SetFrobber { abstract void frob(Set s); }
abstract static class ColFrobber { abstract void frob(Collection c); }
static ColFrobber adder(final int i) {
return new ColFrobber() {void frob(Collection c) { c.add(i); }};
}
static final ColFrobber[] adders =
{ adder(1 ), adder(3 ), adder(2 ) };
static MapFrobber putter(final int k, final int v) {
return new MapFrobber() {void frob(Map m) { m.put(k,v); }};
}
static final MapFrobber[] putters =
{ putter(1 , -2 ), putter(3 , -6 ), putter(2 , -4 ) };
static void unexpected(Throwable t, Object suspect) {
System.out.println(suspect.getClass());
unexpected(t);
}
static void testCollections(Collection c1, Collection c2) {
try {
compareCollections(c1, c2);
for (ColFrobber adder : adders) {
for (Collection c : new Collection[]{c1, c2})
adder.frob(c);
compareCollections(c1, c2);
}
} catch (Throwable t) { unexpected(t, c1); }
}
static void testNavigableSets(NavigableSet s1, NavigableSet s2) {
try {
compareNavigableSets(s1, s2);
for (ColFrobber adder : adders) {
for (Set s : new Set[]{s1, s2})
adder.frob(s);
compareNavigableSets(s1, s2);
}
} catch (Throwable t) { unexpected(t, s1); }
}
static void testMaps(Map m1, Map m2) {
try {
compareMaps(m1, m2);
for (MapFrobber putter : putters) {
for (Map m : new Map[]{m1, m2})
putter.frob(m);
compareMaps(m1, m2);
}
} catch (Throwable t) { unexpected(t, m1); }
}
static void testNavigableMaps(NavigableMap m1, NavigableMap m2) {
try {
compareNavigableMaps(m1, m2);
for (MapFrobber putter : putters) {
for (Map m : new Map[]{m1, m2})
putter.frob(m);
compareNavigableMaps(m1, m2);
}
} catch (Throwable t) { unexpected(t, m1); }
}
static int randomize(int size) { return rnd.nextInt(size + 2 ); }
@SuppressWarnings("serial" )
private static void realMain(String[] args) {
testNavigableMaps(
new ConcurrentSkipListMap(),
new ConcurrentSkipListMap() {
public int size() {return randomize(super .size());}});
testNavigableSets(
new ConcurrentSkipListSet(),
new ConcurrentSkipListSet() {
public int size() {return randomize(super .size());}});
testCollections(
new CopyOnWriteArraySet(),
new CopyOnWriteArraySet() {
public int size() {return randomize(super .size());}});
testCollections(
new CopyOnWriteArrayList(),
new CopyOnWriteArrayList() {
public int size() {return randomize(super .size());}});
testCollections(
new TreeSet(),
new TreeSet() {
public int size() {return randomize(super .size());}});
testMaps(
new ConcurrentHashMap(),
new ConcurrentHashMap() {
public int size() {return randomize(super .size());}});
testCollections(
new ConcurrentLinkedDeque(),
new ConcurrentLinkedDeque() {
public int size() {return randomize(super .size());}});
testCollections(
new ConcurrentLinkedQueue(),
new ConcurrentLinkedQueue() {
public int size() {return randomize(super .size());}});
testCollections(
new LinkedTransferQueue(),
new LinkedTransferQueue() {
public int size() {return randomize(super .size());}});
testCollections(
new LinkedBlockingQueue(),
new LinkedBlockingQueue() {
public int size() {return randomize(super .size());}});
testCollections(
new LinkedBlockingDeque(),
new LinkedBlockingDeque() {
public int size() {return randomize(super .size());}});
testCollections(
new ArrayBlockingQueue(5 ),
new ArrayBlockingQueue(5 ) {
public int size() {return randomize(super .size());}});
testCollections(
new PriorityBlockingQueue(5 ),
new PriorityBlockingQueue(5 ) {
public int size() {return randomize(super .size());}});
}
//--------------------- Infrastructure ---------------------------
static volatile int passed = 0 , failed = 0 ;
static void pass() {passed++;}
static void fail() {failed++; Thread .dumpStack();}
static void fail(String msg) {System.out.println(msg); fail();}
static void unexpected(Throwable t) {failed++; t.printStackTrace();}
static void check(boolean cond) {if (cond) pass(); else fail();}
static void equal(Object x, Object y) {
if (x == null ? y == null : x.equals(y)) pass();
else fail(x + " not equal to " + y);}
static void arrayEqual(Object[] x, Object[] y) {
if (x == null ? y == null : Arrays.equals(x, y)) pass();
else fail(Arrays.toString(x) + " not equal to " + Arrays.toString(y));}
public static void main(String[] args) {
try {realMain(args);} catch (Throwable t) {unexpected(t);}
System.out.printf("%nPassed = %d, failed = %d%n%n" , passed, failed);
if (failed > 0 ) throw new AssertionError("Some tests failed" );}
private abstract static class CheckedThread extends Thread {
abstract void realRun() throws Throwable;
public void run() {
try {realRun();} catch (Throwable t) {unexpected(t);}}}
}
Messung V0.5 in Prozent C=96 H=89 G=92
¤ Dauer der Verarbeitung: 0.14 Sekunden
(vorverarbeitet am 2026-06-10)
¤
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