/*
* Copyright (c) 2008-2014 MongoDB, Inc.
*
* 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.mongodb.internal.connection;
import com.mongodb.MongoException;
import com.mongodb.MongoTimeoutException;
import org.junit.Test;
import java.io.Closeable;
import static java.util.concurrent.TimeUnit.MILLISECONDS;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;
public class ConcurrentPoolTest {
private ConcurrentPool<TestCloseable> pool;
@Test
public void testThatGetDecreasesAvailability() {
pool = new ConcurrentPool<TestCloseable>(3, new TestItemFactory());
pool.get();
pool.get();
pool.get();
try {
pool.get(1, MILLISECONDS);
fail();
} catch (MongoTimeoutException e) {
// all good
}
}
@Test
public void testThatReleaseIncreasesAvailability() {
pool = new ConcurrentPool<TestCloseable>(3, new TestItemFactory());
pool.get();
pool.get();
pool.release(pool.get());
assertNotNull(pool.get());
}
@Test
public void testThatGetReleasesPermitIfCreateFails() {
pool = new ConcurrentPool<TestCloseable>(1, new TestItemFactory(true));
try {
pool.get();
fail();
} catch (MongoException e) {
// expected
}
assertTrue(pool.acquirePermit(-1, MILLISECONDS));
}
@Test
public void testInUseCount() {
pool = new ConcurrentPool<TestCloseable>(3, new TestItemFactory());
assertEquals(0, pool.getInUseCount());
TestCloseable closeable = pool.get();
assertEquals(1, pool.getInUseCount());
pool.release(closeable);
assertEquals(0, pool.getInUseCount());
}
@Test
public void testAvailableCount() {
pool = new ConcurrentPool<TestCloseable>(3, new TestItemFactory());
assertEquals(0, pool.getAvailableCount());
TestCloseable closeable = pool.get();
assertEquals(0, pool.getAvailableCount());
pool.release(closeable);
assertEquals(1, pool.getAvailableCount());
closeable = pool.get();
pool.release(closeable, true);
assertEquals(0, pool.getAvailableCount());
}
@Test
public void testAddItemToPoolOnRelease() {
pool = new ConcurrentPool<TestCloseable>(3, new TestItemFactory());
TestCloseable closeable = pool.get();
pool.release(closeable, false);
assertFalse(closeable.isClosed());
}
@Test
public void testCloseItemOnReleaseWithDiscard() {
pool = new ConcurrentPool<TestCloseable>(3, new TestItemFactory());
TestCloseable closeable = pool.get();
pool.release(closeable, true);
assertTrue(closeable.isClosed());
}
@Test
public void testCloseAllItemsAfterPoolClosed() {
pool = new ConcurrentPool<TestCloseable>(3, new TestItemFactory());
TestCloseable c1 = pool.get();
TestCloseable c2 = pool.get();
pool.release(c1);
pool.release(c2);
pool.close();
assertTrue(c1.isClosed());
assertTrue(c2.isClosed());
}
@Test
public void testCloseItemOnReleaseAfterPoolClosed() {
pool = new ConcurrentPool<TestCloseable>(3, new TestItemFactory());
TestCloseable c1 = pool.get();
pool.close();
pool.release(c1);
assertTrue(c1.isClosed());
}
@Test
public void testEnsureMinSize() {
pool = new ConcurrentPool<TestCloseable>(3, new TestItemFactory());
pool.ensureMinSize(0, false);
assertEquals(0, pool.getAvailableCount());
pool.ensureMinSize(1, false);
assertEquals(1, pool.getAvailableCount());
pool.ensureMinSize(1, false);
assertEquals(1, pool.getAvailableCount());
pool.get();
pool.ensureMinSize(1, false);
assertEquals(0, pool.getAvailableCount());
pool.ensureMinSize(4, false);
assertEquals(3, pool.getAvailableCount());
}
@Test
public void whenEnsuringMinSizeShouldNotInitializePooledItemIfNotRequested() {
pool = new ConcurrentPool<TestCloseable>(3, new TestItemFactory());
pool.ensureMinSize(1, false);
assertFalse(pool.get().isInitialized());
}
@Test
public void whenEnsuringMinSizeShouldInitializePooledItemIfRequested() {
pool = new ConcurrentPool<TestCloseable>(3, new TestItemFactory());
pool.ensureMinSize(1, true);
assertTrue(pool.get().isInitialized());
}
@Test
public void testThatEnsuringMinSizeReleasesPermitIfCreateFails() {
pool = new ConcurrentPool<TestCloseable>(1, new TestItemFactory(true));
try {
pool.ensureMinSize(1, true);
fail();
} catch (MongoException e) {
// expected
}
assertTrue(pool.acquirePermit(-1, MILLISECONDS));
}
@Test
public void testPrune() {
pool = new ConcurrentPool<TestCloseable>(3, new TestItemFactory());
TestCloseable t1 = pool.get();
TestCloseable t2 = pool.get();
t1.shouldPrune = true;
t2.shouldPrune = true;
pool.release(t1);
pool.release(t2);
pool.prune();
assertEquals(0, pool.getAvailableCount());
assertEquals(0, pool.getInUseCount());
assertTrue(t1.isClosed());
assertTrue(t2.isClosed());
}
class TestItemFactory implements ConcurrentPool.ItemFactory<TestCloseable> {
private final boolean shouldThrowOnCreate;
TestItemFactory() {
this(false);
}
TestItemFactory(final boolean shouldThrowOnCreate) {
this.shouldThrowOnCreate = shouldThrowOnCreate;
}
@Override
public TestCloseable create(final boolean initialize) {
if (shouldThrowOnCreate) {
throw new MongoException("This is a journey");
}
return new TestCloseable(initialize);
}
@Override
public void close(final TestCloseable closeable) {
closeable.close();
}
@Override
public boolean shouldPrune(final TestCloseable testCloseable) {
return testCloseable.shouldPrune();
}
}
static class TestCloseable implements Closeable {
private boolean closed;
private boolean shouldPrune;
private final boolean initialized;
TestCloseable(final boolean initialize) {
this.initialized = initialize;
}
@Override
public void close() {
closed = true;
}
boolean isClosed() {
return closed;
}
public boolean isInitialized() {
return initialized;
}
public boolean shouldPrune() {
return shouldPrune;
}
}
}