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/*
* Copyright (C) 2013, 2017 Brett Wooldridge
*
* 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.zaxxer.hikari.pool;
import static com.zaxxer.hikari.pool.TestElf.getPool;
import static com.zaxxer.hikari.pool.TestElf.newHikariConfig;
import static com.zaxxer.hikari.util.ClockSource.currentTime;
import static com.zaxxer.hikari.util.ClockSource.elapsedMillis;
import static com.zaxxer.hikari.util.UtilityElf.quietlySleep;
import static java.util.concurrent.Executors.newFixedThreadPool;
import static java.util.concurrent.TimeUnit.SECONDS;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;
import java.sql.Connection;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.atomic.AtomicReference;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.zaxxer.hikari.HikariConfig;
import com.zaxxer.hikari.HikariDataSource;
import com.zaxxer.hikari.mocks.StubDataSource;
/**
* @author Matthew Tambara (matthew.tambara@liferay.com)
*/
public class ConnectionPoolSizeVsThreadsTest {
public static final Logger LOGGER = LoggerFactory.getLogger(ConnectionPoolSizeVsThreadsTest.class);
public static final int ITERATIONS = 50_000;
@Test
public void testPoolSizeAboutSameSizeAsThreadCount() throws Exception {
final int threadCount = 50;
final Counts counts = testPoolSize(2 /*minIdle*/,
100 /*maxPoolSize*/,
threadCount,
1 /*workTimeMs*/,
0 /*restTimeMs*/,
20 /*connectionAcquisitionTimeMs*/,
ITERATIONS,
SECONDS.toMillis(2) /*postTestTimeMs*/);
// maxActive may never make it to threadCount but it shouldn't be any higher
assertEquals(threadCount, counts.maxActive, 15 /*delta*/);
assertEquals(threadCount, counts.maxTotal, 5 /*delta*/);
}
@Test
public void testSlowConnectionTimeBurstyWork() throws Exception {
// setup a bursty work load, 50 threads all needing to do around 100 units of work.
// Using a more realistic time for connection startup of 250 ms and only 5 seconds worth of work will mean that we end up finishing
// all of the work before we actually have setup 50 connections even though we have requested 50 connections
final int threadCount = 50;
final int workItems = threadCount * 100;
final int workTimeMs = 0;
final int connectionAcquisitionTimeMs = 250;
final Counts counts = testPoolSize(2 /*minIdle*/,
100 /*maxPoolSize*/,
threadCount,
workTimeMs,
0 /*restTimeMs*/,
connectionAcquisitionTimeMs,
workItems /*iterations*/,
SECONDS.toMillis(3) /*postTestTimeMs*/);
// hard to put exact bounds on how many thread we will use but we can put an upper bound on usage (if there was only one thread)
final long totalWorkTime = workItems * workTimeMs;
final long connectionMax = totalWorkTime / connectionAcquisitionTimeMs;
assertTrue(connectionMax <= counts.maxActive);
assertEquals(connectionMax, counts.maxTotal, 2 + 2 /*delta*/);
}
private Counts testPoolSize(final int minIdle, final int maxPoolSize, final int threadCount,
final long workTimeMs, final long restTimeMs, final long connectionAcquisitionTimeMs,
final int iterations, final long postTestTimeMs) throws Exception {
LOGGER.info("Starting test (minIdle={}, maxPoolSize={}, threadCount={}, workTimeMs={}, restTimeMs={}, connectionAcquisitionTimeMs={}, iterations={}, postTestTimeMs={})",
minIdle, maxPoolSize, threadCount, workTimeMs, restTimeMs, connectionAcquisitionTimeMs, iterations, postTestTimeMs);
final HikariConfig config = newHikariConfig();
config.setMinimumIdle(minIdle);
config.setMaximumPoolSize(maxPoolSize);
config.setInitializationFailTimeout(Long.MAX_VALUE);
config.setConnectionTimeout(2500);
config.setDataSourceClassName("com.zaxxer.hikari.mocks.StubDataSource");
final AtomicReference<Exception> ref = new AtomicReference<>(null);
// Initialize HikariPool with no initial connections and room to grow
try (final HikariDataSource ds = new HikariDataSource(config)) {
final StubDataSource stubDataSource = ds.unwrap(StubDataSource.class);
// connection acquisition takes more than 0 ms in a real system
stubDataSource.setConnectionAcquistionTime(connectionAcquisitionTimeMs);
final ExecutorService threadPool = newFixedThreadPool(threadCount);
final CountDownLatch allThreadsDone = new CountDownLatch(iterations);
for (int i = 0; i < iterations; i++) {
threadPool.submit(() -> {
if (ref.get() == null) {
quietlySleep(restTimeMs);
try (Connection c2 = ds.getConnection()) {
quietlySleep(workTimeMs);
}
catch (Exception e) {
ref.set(e);
}
}
allThreadsDone.countDown();
});
}
final HikariPool pool = getPool(ds);
// collect pool usage data while work is still being done
final Counts underLoad = new Counts();
while (allThreadsDone.getCount() > 0 || pool.getTotalConnections() < minIdle) {
quietlySleep(50);
underLoad.updateMaxCounts(pool);
}
// wait for long enough any pending acquisitions have already been done
LOGGER.info("Test Over, waiting for post delay time {}ms ", postTestTimeMs);
quietlySleep(connectionAcquisitionTimeMs + workTimeMs + restTimeMs);
// collect pool data while there is no work to do.
final Counts postLoad = new Counts();
final long start = currentTime();
while (elapsedMillis(start) < postTestTimeMs) {
quietlySleep(50);
postLoad.updateMaxCounts(pool);
}
allThreadsDone.await();
threadPool.shutdown();
threadPool.awaitTermination(30, SECONDS);
if (ref.get() != null) {
LOGGER.error("Task failed", ref.get());
fail("Task failed");
}
LOGGER.info("Under Load... {}", underLoad);
LOGGER.info("Post Load.... {}", postLoad);
// verify that the no connections created after the work has stopped
if (postTestTimeMs > 0) {
if (postLoad.maxActive != 0) {
fail("Max Active was greater than 0 after test was done");
}
final int createdAfterWorkAllFinished = postLoad.maxTotal - underLoad.maxTotal;
assertEquals("Connections were created when there was no waiting consumers", 0, createdAfterWorkAllFinished, 1 /*delta*/);
}
return underLoad;
}
}
private static class Counts {
int maxTotal = 0;
int maxActive = 0;
void updateMaxCounts(final HikariPool pool) {
maxTotal = Math.max(pool.getTotalConnections(), maxTotal);
maxActive = Math.max(pool.getActiveConnections(), maxActive);
}
@Override
public String toString() {
return "Counts{" +
"maxTotal=" + maxTotal +
", maxActive=" + maxActive +
'}';
}
}
}
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