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Diffstat (limited to 'guava-tests/test/com/google/common/util/concurrent/StripedTest.java')
-rw-r--r-- | guava-tests/test/com/google/common/util/concurrent/StripedTest.java | 165 |
1 files changed, 0 insertions, 165 deletions
diff --git a/guava-tests/test/com/google/common/util/concurrent/StripedTest.java b/guava-tests/test/com/google/common/util/concurrent/StripedTest.java deleted file mode 100644 index 0a4a655..0000000 --- a/guava-tests/test/com/google/common/util/concurrent/StripedTest.java +++ /dev/null @@ -1,165 +0,0 @@ -/* - * Copyright (C) 2011 The Guava Authors - * - * Licensed under the Apache License, Version 2.0 (the "License"); - * you may not use this file except in compliance with the License. - * You may obtain a copy of the License at - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - * See the License for the specific language governing permissions and - * limitations under the License. - */ - -package com.google.common.util.concurrent; - -import static com.google.common.collect.Iterables.concat; - -import com.google.common.base.Functions; -import com.google.common.collect.ImmutableList; -import com.google.common.collect.Lists; -import com.google.common.collect.Maps; -import com.google.common.collect.Ordering; -import com.google.common.collect.Sets; -import com.google.common.testing.GcFinalization; -import com.google.common.testing.NullPointerTester; - -import junit.framework.TestCase; - -import java.lang.ref.WeakReference; -import java.util.List; -import java.util.Map; -import java.util.Set; -import java.util.concurrent.locks.Lock; - -/** - * Tests for Striped. - * - * @author Dimitris Andreou - */ -public class StripedTest extends TestCase { - private static List<Striped<?>> strongImplementations() { - return ImmutableList.of( - Striped.readWriteLock(100), - Striped.readWriteLock(256), - Striped.lock(100), - Striped.lock(256), - Striped.semaphore(100, 1), - Striped.semaphore(256, 1)); - } - - private static List<Striped<?>> weakImplementations() { - return ImmutableList.of( - Striped.lazyWeakReadWriteLock(50), - Striped.lazyWeakReadWriteLock(64), - Striped.lazyWeakLock(50), - Striped.lazyWeakLock(64), - Striped.lazyWeakSemaphore(50, 1), - Striped.lazyWeakSemaphore(64, 1)); - } - - private static Iterable<Striped<?>> allImplementations() { - return concat(strongImplementations(), weakImplementations()); - } - - public void testNull() throws Exception { - for (Striped<?> striped : allImplementations()) { - new NullPointerTester().testAllPublicInstanceMethods(striped); - } - } - - public void testSizes() { - // not bothering testing all variations, since we know they share implementations - assertTrue(Striped.lock(100).size() >= 100); - assertTrue(Striped.lock(256).size() == 256); - assertTrue(Striped.lazyWeakLock(100).size() >= 100); - assertTrue(Striped.lazyWeakLock(256).size() == 256); - } - - public void testWeakImplementations() { - for (Striped<?> striped : weakImplementations()) { - WeakReference<Object> weakRef = new WeakReference<Object>(striped.get(new Object())); - GcFinalization.awaitClear(weakRef); - } - } - - public void testStrongImplementations() { - for (Striped<?> striped : strongImplementations()) { - WeakReference<Object> weakRef = new WeakReference<Object>(striped.get(new Object())); - WeakReference<Object> garbage = new WeakReference<Object>(new Object()); - GcFinalization.awaitClear(garbage); - assertNotNull(weakRef.get()); - } - } - - public void testMaximalWeakStripedLock() { - Striped<Lock> stripedLock = Striped.lazyWeakLock(Integer.MAX_VALUE); - for (int i = 0; i < 10000; i++) { - stripedLock.get(new Object()).lock(); - // nothing special (e.g. an exception) happens - } - } - - public void testBulkGetReturnsSorted() { - for (Striped<?> striped : allImplementations()) { - Map<Object, Integer> indexByLock = Maps.newHashMap(); - for (int i = 0; i < striped.size(); i++) { - indexByLock.put(striped.getAt(i), i); - } - - // ensure that bulkGet returns locks in monotonically increasing order - for (int objectsNum = 1; objectsNum <= striped.size() * 2; objectsNum++) { - Set<Object> objects = Sets.newHashSetWithExpectedSize(objectsNum); - for (int i = 0; i < objectsNum; i++) { - objects.add(new Object()); - } - - Iterable<?> locks = striped.bulkGet(objects); - assertTrue(Ordering.natural().onResultOf(Functions.forMap(indexByLock)).isOrdered(locks)); - - // check idempotency - Iterable<?> locks2 = striped.bulkGet(objects); - assertEquals(Lists.newArrayList(locks), Lists.newArrayList(locks2)); - } - } - } - - /** - * Checks idempotency, and that we observe the promised number of stripes. - */ - public void testBasicInvariants() { - for (Striped<?> striped : allImplementations()) { - assertBasicInvariants(striped); - } - } - - private static void assertBasicInvariants(Striped<?> striped) { - Set<Object> observed = Sets.newIdentityHashSet(); // for the sake of weakly referenced locks. - // this gets the stripes with #getAt(index) - for (int i = 0; i < striped.size(); i++) { - Object object = striped.getAt(i); - assertNotNull(object); - assertSame(object, striped.getAt(i)); // idempotent - observed.add(object); - } - assertTrue("All stripes observed", observed.size() == striped.size()); - - // this uses #get(key), makes sure an already observed stripe is returned - for (int i = 0; i < striped.size() * 100; i++) { - assertTrue(observed.contains(striped.get(new Object()))); - } - - try { - striped.getAt(-1); - fail(); - } catch (RuntimeException expected) {} - - try { - striped.getAt(striped.size()); - fail(); - } catch (RuntimeException expected) {} - } -} |