311 lines
9.8 KiB
Java
311 lines
9.8 KiB
Java
/*
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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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* This file is available under and governed by the GNU General Public
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* License version 2 only, as published by the Free Software Foundation.
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* However, the following notice accompanied the original version of this
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* file:
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*
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* Written by Doug Lea with assistance from members of JCP JSR-166
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* Expert Group and released to the public domain, as explained at
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* http://creativecommons.org/publicdomain/zero/1.0/
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* Other contributors include Andrew Wright, Jeffrey Hayes,
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* Pat Fisher, Mike Judd.
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*/
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import java.util.concurrent.atomic.AtomicLongFieldUpdater;
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import junit.framework.Test;
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import junit.framework.TestSuite;
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public class AtomicLongFieldUpdaterTest extends JSR166TestCase {
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volatile long x = 0;
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protected volatile long protectedField;
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private volatile long privateField;
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long w;
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float z;
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public static void main(String[] args) {
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main(suite(), args);
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}
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public static Test suite() {
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return new TestSuite(AtomicLongFieldUpdaterTest.class);
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}
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AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> updaterFor(String fieldName) {
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return AtomicLongFieldUpdater.newUpdater
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(AtomicLongFieldUpdaterTest.class, fieldName);
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}
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/**
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* Construction with non-existent field throws RuntimeException
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*/
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public void testConstructor() {
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try {
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updaterFor("y");
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shouldThrow();
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} catch (RuntimeException success) {
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assertNotNull(success.getCause());
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}
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}
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/**
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* construction with field not of given type throws IllegalArgumentException
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*/
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public void testConstructor2() {
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try {
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updaterFor("z");
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shouldThrow();
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} catch (IllegalArgumentException success) {}
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}
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/**
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* construction with non-volatile field throws IllegalArgumentException
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*/
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public void testConstructor3() {
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try {
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updaterFor("w");
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shouldThrow();
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} catch (IllegalArgumentException success) {}
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}
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/**
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* construction using private field from subclass throws RuntimeException
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*/
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public void testPrivateFieldInSubclass() {
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new NonNestmates.AtomicLongFieldUpdaterTestSubclass()
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.checkPrivateAccess();
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}
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/**
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* construction from unrelated class; package access is allowed,
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* private access is not
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*/
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public void testUnrelatedClassAccess() {
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new NonNestmates().checkPackageAccess(this);
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new NonNestmates().checkPrivateAccess(this);
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}
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/**
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* get returns the last value set or assigned
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*/
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public void testGetSet() {
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AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
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a = updaterFor("x");
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x = 1;
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assertEquals(1, a.get(this));
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a.set(this, 2);
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assertEquals(2, a.get(this));
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a.set(this, -3);
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assertEquals(-3, a.get(this));
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}
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/**
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* get returns the last value lazySet by same thread
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*/
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public void testGetLazySet() {
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AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
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a = updaterFor("x");
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x = 1;
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assertEquals(1, a.get(this));
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a.lazySet(this, 2);
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assertEquals(2, a.get(this));
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a.lazySet(this, -3);
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assertEquals(-3, a.get(this));
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}
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/**
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* compareAndSet succeeds in changing value if equal to expected else fails
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*/
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public void testCompareAndSet() {
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AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
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a = updaterFor("x");
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x = 1;
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assertTrue(a.compareAndSet(this, 1, 2));
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assertTrue(a.compareAndSet(this, 2, -4));
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assertEquals(-4, a.get(this));
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assertFalse(a.compareAndSet(this, -5, 7));
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assertEquals(-4, a.get(this));
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assertTrue(a.compareAndSet(this, -4, 7));
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assertEquals(7, a.get(this));
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}
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/**
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* compareAndSet succeeds in changing protected field value if
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* equal to expected else fails
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*/
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public void testCompareAndSetProtected() {
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AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
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a = updaterFor("protectedField");
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protectedField = 1;
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assertTrue(a.compareAndSet(this, 1, 2));
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assertTrue(a.compareAndSet(this, 2, -4));
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assertEquals(-4, a.get(this));
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assertFalse(a.compareAndSet(this, -5, 7));
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assertEquals(-4, a.get(this));
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assertTrue(a.compareAndSet(this, -4, 7));
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assertEquals(7, a.get(this));
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}
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/**
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* compareAndSet succeeds in changing protected field value if
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* equal to expected else fails
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*/
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public void testCompareAndSetProtectedInSubclass() {
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new NonNestmates.AtomicLongFieldUpdaterTestSubclass()
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.checkCompareAndSetProtectedSub();
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}
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/**
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* compareAndSet in one thread enables another waiting for value
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* to succeed
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*/
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public void testCompareAndSetInMultipleThreads() throws Exception {
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x = 1;
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final AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
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a = updaterFor("x");
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Thread t = new Thread(new CheckedRunnable() {
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public void realRun() {
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while (!a.compareAndSet(AtomicLongFieldUpdaterTest.this, 2, 3))
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Thread.yield();
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}});
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t.start();
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assertTrue(a.compareAndSet(this, 1, 2));
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t.join(LONG_DELAY_MS);
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assertFalse(t.isAlive());
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assertEquals(3, a.get(this));
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}
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/**
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* repeated weakCompareAndSet succeeds in changing value when equal
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* to expected
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*/
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public void testWeakCompareAndSet() {
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AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
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a = updaterFor("x");
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x = 1;
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do {} while (!a.weakCompareAndSet(this, 1, 2));
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do {} while (!a.weakCompareAndSet(this, 2, -4));
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assertEquals(-4, a.get(this));
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do {} while (!a.weakCompareAndSet(this, -4, 7));
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assertEquals(7, a.get(this));
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}
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/**
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* getAndSet returns previous value and sets to given value
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*/
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public void testGetAndSet() {
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AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
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a = updaterFor("x");
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x = 1;
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assertEquals(1, a.getAndSet(this, 0));
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assertEquals(0, a.getAndSet(this, -10));
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assertEquals(-10, a.getAndSet(this, 1));
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}
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/**
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* getAndAdd returns previous value and adds given value
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*/
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public void testGetAndAdd() {
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AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
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a = updaterFor("x");
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x = 1;
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assertEquals(1, a.getAndAdd(this, 2));
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assertEquals(3, a.get(this));
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assertEquals(3, a.getAndAdd(this, -4));
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assertEquals(-1, a.get(this));
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}
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/**
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* getAndDecrement returns previous value and decrements
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*/
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public void testGetAndDecrement() {
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AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
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a = updaterFor("x");
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x = 1;
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assertEquals(1, a.getAndDecrement(this));
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assertEquals(0, a.getAndDecrement(this));
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assertEquals(-1, a.getAndDecrement(this));
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}
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/**
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* getAndIncrement returns previous value and increments
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*/
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public void testGetAndIncrement() {
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AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
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a = updaterFor("x");
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x = 1;
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assertEquals(1, a.getAndIncrement(this));
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assertEquals(2, a.get(this));
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a.set(this, -2);
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assertEquals(-2, a.getAndIncrement(this));
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assertEquals(-1, a.getAndIncrement(this));
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assertEquals(0, a.getAndIncrement(this));
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assertEquals(1, a.get(this));
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}
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/**
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* addAndGet adds given value to current, and returns current value
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*/
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public void testAddAndGet() {
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AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
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a = updaterFor("x");
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x = 1;
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assertEquals(3, a.addAndGet(this, 2));
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assertEquals(3, a.get(this));
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assertEquals(-1, a.addAndGet(this, -4));
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assertEquals(-1, a.get(this));
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}
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/**
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* decrementAndGet decrements and returns current value
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*/
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public void testDecrementAndGet() {
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AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
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a = updaterFor("x");
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x = 1;
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assertEquals(0, a.decrementAndGet(this));
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assertEquals(-1, a.decrementAndGet(this));
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assertEquals(-2, a.decrementAndGet(this));
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assertEquals(-2, a.get(this));
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}
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/**
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* incrementAndGet increments and returns current value
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*/
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public void testIncrementAndGet() {
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AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a;
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a = updaterFor("x");
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x = 1;
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assertEquals(2, a.incrementAndGet(this));
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assertEquals(2, a.get(this));
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a.set(this, -2);
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assertEquals(-1, a.incrementAndGet(this));
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assertEquals(0, a.incrementAndGet(this));
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assertEquals(1, a.incrementAndGet(this));
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assertEquals(1, a.get(this));
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}
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}
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