| /* |
| * 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. |
| */ |
| |
| /* |
| * This file is available under and governed by the GNU General Public |
| * License version 2 only, as published by the Free Software Foundation. |
| * However, the following notice accompanied the original version of this |
| * file: |
| * |
| * Written by Doug Lea with assistance from members of JCP JSR-166 |
| * Expert Group and released to the public domain, as explained at |
| * http://creativecommons.org/publicdomain/zero/1.0/ |
| * Other contributors include Andrew Wright, Jeffrey Hayes, |
| * Pat Fisher, Mike Judd. |
| */ |
| |
| import java.util.concurrent.atomic.AtomicReferenceFieldUpdater; |
| |
| import junit.framework.Test; |
| import junit.framework.TestSuite; |
| |
| public class AtomicReferenceFieldUpdaterTest extends JSR166TestCase { |
| volatile Integer x = null; |
| protected volatile Integer protectedField; |
| private volatile Integer privateField; |
| Object z; |
| Integer w; |
| volatile int i; |
| |
| public static void main(String[] args) { |
| main(suite(), args); |
| } |
| public static Test suite() { |
| return new TestSuite(AtomicReferenceFieldUpdaterTest.class); |
| } |
| |
| static AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer> updaterFor(String fieldName) { |
| return AtomicReferenceFieldUpdater.newUpdater |
| (AtomicReferenceFieldUpdaterTest.class, Integer.class, fieldName); |
| } |
| |
| /** |
| * Construction with non-existent field throws RuntimeException |
| */ |
| public void testConstructor() { |
| try { |
| updaterFor("y"); |
| shouldThrow(); |
| } catch (RuntimeException success) { |
| assertNotNull(success.getCause()); |
| } |
| } |
| |
| /** |
| * construction with field not of given type throws ClassCastException |
| */ |
| public void testConstructor2() { |
| try { |
| updaterFor("z"); |
| shouldThrow(); |
| } catch (ClassCastException success) {} |
| } |
| |
| /** |
| * Constructor with non-volatile field throws IllegalArgumentException |
| */ |
| public void testConstructor3() { |
| try { |
| updaterFor("w"); |
| shouldThrow(); |
| } catch (IllegalArgumentException success) {} |
| } |
| |
| /** |
| * Constructor with non-reference field throws ClassCastException |
| */ |
| public void testConstructor4() { |
| try { |
| updaterFor("i"); |
| shouldThrow(); |
| } catch (ClassCastException success) {} |
| } |
| |
| /** |
| * construction using private field from subclass throws RuntimeException |
| */ |
| public void testPrivateFieldInSubclass() { |
| new NonNestmates.AtomicReferenceFieldUpdaterTestSubclass() |
| .checkPrivateAccess(); |
| } |
| |
| /** |
| * construction from unrelated class; package access is allowed, |
| * private access is not |
| */ |
| public void testUnrelatedClassAccess() { |
| new NonNestmates().checkPackageAccess(this); |
| new NonNestmates().checkPrivateAccess(this); |
| } |
| |
| /** |
| * get returns the last value set or assigned |
| */ |
| public void testGetSet() { |
| AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer> a; |
| a = updaterFor("x"); |
| x = one; |
| assertSame(one, a.get(this)); |
| a.set(this, two); |
| assertSame(two, a.get(this)); |
| a.set(this, m3); |
| assertSame(m3, a.get(this)); |
| } |
| |
| /** |
| * get returns the last value lazySet by same thread |
| */ |
| public void testGetLazySet() { |
| AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer> a; |
| a = updaterFor("x"); |
| x = one; |
| assertSame(one, a.get(this)); |
| a.lazySet(this, two); |
| assertSame(two, a.get(this)); |
| a.lazySet(this, m3); |
| assertSame(m3, a.get(this)); |
| } |
| |
| /** |
| * compareAndSet succeeds in changing value if same as expected else fails |
| */ |
| public void testCompareAndSet() { |
| AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer> a; |
| a = updaterFor("x"); |
| x = one; |
| assertTrue(a.compareAndSet(this, one, two)); |
| assertTrue(a.compareAndSet(this, two, m4)); |
| assertSame(m4, a.get(this)); |
| assertFalse(a.compareAndSet(this, m5, seven)); |
| assertNotSame(seven, a.get(this)); |
| assertTrue(a.compareAndSet(this, m4, seven)); |
| assertSame(seven, a.get(this)); |
| } |
| |
| /** |
| * compareAndSet succeeds in changing protected field value if |
| * same as expected else fails |
| */ |
| public void testCompareAndSetProtectedInSubclass() { |
| new NonNestmates.AtomicReferenceFieldUpdaterTestSubclass() |
| .checkCompareAndSetProtectedSub(); |
| } |
| |
| /** |
| * compareAndSet in one thread enables another waiting for value |
| * to succeed |
| */ |
| public void testCompareAndSetInMultipleThreads() throws Exception { |
| x = one; |
| final AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer> a; |
| a = updaterFor("x"); |
| |
| Thread t = new Thread(new CheckedRunnable() { |
| public void realRun() { |
| while (!a.compareAndSet(AtomicReferenceFieldUpdaterTest.this, two, three)) |
| Thread.yield(); |
| }}); |
| |
| t.start(); |
| assertTrue(a.compareAndSet(this, one, two)); |
| t.join(LONG_DELAY_MS); |
| assertFalse(t.isAlive()); |
| assertSame(three, a.get(this)); |
| } |
| |
| /** |
| * repeated weakCompareAndSet succeeds in changing value when same as expected |
| */ |
| public void testWeakCompareAndSet() { |
| AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer> a; |
| a = updaterFor("x"); |
| x = one; |
| do {} while (!a.weakCompareAndSet(this, one, two)); |
| do {} while (!a.weakCompareAndSet(this, two, m4)); |
| assertSame(m4, a.get(this)); |
| do {} while (!a.weakCompareAndSet(this, m4, seven)); |
| assertSame(seven, a.get(this)); |
| } |
| |
| /** |
| * getAndSet returns previous value and sets to given value |
| */ |
| public void testGetAndSet() { |
| AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer> a; |
| a = updaterFor("x"); |
| x = one; |
| assertSame(one, a.getAndSet(this, zero)); |
| assertSame(zero, a.getAndSet(this, m10)); |
| assertSame(m10, a.getAndSet(this, 1)); |
| } |
| |
| } |