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SimplePoolTests.java
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SimplePoolTests.java
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/*
* Copyright 2002-2020 the original author or 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
*
* https://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 org.springframework.integration.util;
import static org.hamcrest.Matchers.instanceOf;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNotSame;
import static org.junit.Assert.assertSame;
import static org.junit.Assert.assertThat;
import static org.junit.Assert.fail;
import java.util.HashSet;
import java.util.Set;
import java.util.concurrent.Semaphore;
import java.util.concurrent.atomic.AtomicBoolean;
import org.junit.Test;
import org.springframework.integration.test.util.TestUtils;
import org.springframework.messaging.MessagingException;
/**
* @author Gary Russell
* @since 2.2
*
*/
public class SimplePoolTests {
@Test
public void testReuseAndStale() {
final Set<String> strings = new HashSet<String>();
final AtomicBoolean stale = new AtomicBoolean();
SimplePool<String> pool = stringPool(2, strings, stale);
String s1 = pool.getItem();
String s2 = pool.getItem();
assertNotSame(s1, s2);
pool.releaseItem(s1);
String s3 = pool.getItem();
assertSame(s1, s3);
stale.set(true);
pool.releaseItem(s3);
s3 = pool.getItem();
assertNotSame(s1, s3);
assertFalse(strings.remove(s1));
assertEquals(2, pool.getAllocatedCount());
}
@Test
public void testOverCommitandResize() {
final Set<String> strings = new HashSet<String>();
final AtomicBoolean stale = new AtomicBoolean();
SimplePool<String> pool = stringPool(2, strings, stale);
String s1 = pool.getItem();
assertEquals(0, pool.getIdleCount());
assertEquals(1, pool.getActiveCount());
assertEquals(1, pool.getAllocatedCount());
pool.releaseItem(s1);
assertEquals(1, pool.getIdleCount());
assertEquals(0, pool.getActiveCount());
assertEquals(1, pool.getAllocatedCount());
s1 = pool.getItem();
assertEquals(0, pool.getIdleCount());
assertEquals(1, pool.getActiveCount());
assertEquals(1, pool.getAllocatedCount());
String s2 = pool.getItem();
assertNotSame(s1, s2);
pool.setWaitTimeout(1);
assertEquals(0, pool.getIdleCount());
assertEquals(2, pool.getActiveCount());
assertEquals(2, pool.getAllocatedCount());
try {
pool.getItem();
fail("Expected exception");
}
catch (MessagingException e) { }
// resize up
pool.setPoolSize(4);
assertEquals(0, pool.getIdleCount());
assertEquals(2, pool.getActiveCount());
assertEquals(2, pool.getAllocatedCount());
String s3 = pool.getItem();
String s4 = pool.getItem();
assertEquals(0, pool.getIdleCount());
assertEquals(4, pool.getActiveCount());
assertEquals(4, pool.getAllocatedCount());
pool.releaseItem(s4);
assertEquals(1, pool.getIdleCount());
assertEquals(3, pool.getActiveCount());
assertEquals(4, pool.getAllocatedCount());
// resize down
pool.setPoolSize(2);
assertEquals(0, pool.getIdleCount());
assertEquals(3, pool.getActiveCount());
assertEquals(3, pool.getPoolSize());
assertEquals(3, pool.getAllocatedCount());
pool.releaseItem(s3);
assertEquals(0, pool.getIdleCount());
assertEquals(2, pool.getActiveCount());
assertEquals(2, pool.getPoolSize());
assertEquals(2, pool.getAllocatedCount());
assertEquals(2, strings.size());
pool.releaseItem(s2);
pool.releaseItem(s1);
assertEquals(2, pool.getIdleCount());
assertEquals(0, pool.getActiveCount());
assertEquals(2, pool.getPoolSize());
assertEquals(2, strings.size());
assertEquals(2, pool.getAllocatedCount());
}
@Test
public void testForeignObject() {
final Set<String> strings = new HashSet<String>();
final AtomicBoolean stale = new AtomicBoolean();
SimplePool<String> pool = stringPool(2, strings, stale);
pool.getItem();
try {
pool.releaseItem("Hello, world!");
}
catch (Exception e) {
assertThat(e, instanceOf(IllegalArgumentException.class));
}
}
@Test
public void testDoubleReturn() {
final Set<String> strings = new HashSet<String>();
final AtomicBoolean stale = new AtomicBoolean();
SimplePool<String> pool = stringPool(2, strings, stale);
Semaphore permits = TestUtils.getPropertyValue(pool, "permits", Semaphore.class);
assertEquals(2, permits.availablePermits());
String s1 = pool.getItem();
assertEquals(1, permits.availablePermits());
pool.releaseItem(s1);
assertEquals(2, permits.availablePermits());
pool.releaseItem(s1);
assertEquals(2, permits.availablePermits());
}
@Test
public void testClose() {
SimplePool<String> pool = stringPool(10, new HashSet<>(), new AtomicBoolean());
String item1 = pool.getItem();
String item2 = pool.getItem();
pool.releaseItem(item2);
assertEquals(2, pool.getAllocatedCount());
pool.close();
pool.releaseItem(item1);
assertEquals(0, pool.getAllocatedCount());
try {
pool.getItem();
}
catch (Exception e) {
assertThat(e, instanceOf(IllegalStateException.class));
}
}
private SimplePool<String> stringPool(int size, final Set<String> strings,
final AtomicBoolean stale) {
SimplePool<String> pool = new SimplePool<String>(size, new SimplePool.PoolItemCallback<String>() {
private int i;
public String createForPool() {
String string = new String("String" + i++);
strings.add(string);
return string;
}
public boolean isStale(String item) {
if (stale.get()) {
strings.remove(item);
}
return stale.get();
}
public void removedFromPool(String item) {
strings.remove(item);
}
});
return pool;
}
}