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// Copyright 2015 The Bazel Authors. All rights reserved.
//
// 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.devtools.build.lib.actions;
import static com.google.common.truth.Truth.assertThat;
import com.google.common.testing.GcFinalization;
import com.google.devtools.build.lib.concurrent.AbstractQueueVisitor;
import com.google.devtools.build.lib.concurrent.ErrorClassifier;
import com.google.devtools.build.lib.testutil.TestThread;
import com.google.devtools.build.lib.testutil.TestUtils;
import java.lang.ref.WeakReference;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
/**
* Tests for ConcurrentMultimapWithHeadElement.
*/
@RunWith(JUnit4.class)
public class ConcurrentMultimapWithHeadElementTest {
@Test
public void testSmoke() throws Exception {
ConcurrentMultimapWithHeadElement<String, String> multimap =
new ConcurrentMultimapWithHeadElement<>();
assertThat(multimap.putAndGet("key", "val")).isEqualTo("val");
assertThat(multimap.get("key")).isEqualTo("val");
assertThat(multimap.putAndGet("key", "val2")).isEqualTo("val");
multimap.remove("key", "val2");
assertThat(multimap.get("key")).isEqualTo("val");
assertThat(multimap.putAndGet("key", "val2")).isEqualTo("val");
multimap.remove("key", "val");
assertThat(multimap.get("key")).isEqualTo("val2");
}
@Test
public void testDuplicate() throws Exception {
ConcurrentMultimapWithHeadElement<String, String> multimap =
new ConcurrentMultimapWithHeadElement<>();
assertThat(multimap.putAndGet("key", "val")).isEqualTo("val");
assertThat(multimap.get("key")).isEqualTo("val");
assertThat(multimap.putAndGet("key", "val")).isEqualTo("val");
multimap.remove("key", "val");
assertThat(multimap.get("key")).isNull();
}
@Test
public void testDuplicateWithEqualsObject() throws Exception {
ConcurrentMultimapWithHeadElement<String, String> multimap =
new ConcurrentMultimapWithHeadElement<>();
assertThat(multimap.putAndGet("key", "val")).isEqualTo("val");
assertThat(multimap.get("key")).isEqualTo("val");
assertThat(multimap.putAndGet("key", "val")).isEqualTo("val");
multimap.remove("key", "val");
assertThat(multimap.get("key")).isNull();
}
@Test
public void testFailedRemoval() throws Exception {
ConcurrentMultimapWithHeadElement<String, String> multimap =
new ConcurrentMultimapWithHeadElement<>();
assertThat(multimap.putAndGet("key", "val")).isEqualTo("val");
multimap.remove("key", "val2");
assertThat(multimap.get("key")).isEqualTo("val");
}
@Test
public void testNotEmpty() throws Exception {
ConcurrentMultimapWithHeadElement<String, String> multimap =
new ConcurrentMultimapWithHeadElement<>();
assertThat(multimap.putAndGet("key", "val")).isEqualTo("val");
multimap.remove("key", "val2");
assertThat(multimap.get("key")).isEqualTo("val");
}
@Test
public void testKeyRemoved() throws Exception {
String key = new String("key");
ConcurrentMultimapWithHeadElement<String, String> multimap =
new ConcurrentMultimapWithHeadElement<>();
assertThat(multimap.putAndGet(key, "val")).isEqualTo("val");
WeakReference<String> weakKey = new WeakReference<>(key);
multimap.remove(key, "val");
key = null;
GcFinalization.awaitClear(weakKey);
}
@Test
public void testKeyRemovedAndAddedConcurrently() throws Exception {
final ConcurrentMultimapWithHeadElement<String, String> multimap =
new ConcurrentMultimapWithHeadElement<>();
// Because we have two threads racing, run the test many times. Before fixed, there was a 90%
// chance of failure in 10,000 runs.
for (int i = 0; i < 10000; i++) {
assertThat(multimap.putAndGet("key", "val")).isEqualTo("val");
final CountDownLatch threadStart = new CountDownLatch(1);
TestThread testThread = new TestThread() {
@Override
public void runTest() throws Exception {
threadStart.countDown();
multimap.remove("key", "val");
}
};
testThread.start();
assertThat(threadStart.await(TestUtils.WAIT_TIMEOUT_SECONDS, TimeUnit.SECONDS)).isTrue();
assertThat(multimap.putAndGet("key", "val2"))
.isNotNull(); // Removal may not have happened yet.
assertThat(multimap.get("key")).isNotNull(); // If put failed, this will be null.
testThread.joinAndAssertState(2000);
multimap.clear();
}
}
private static class StressTester extends AbstractQueueVisitor {
private final ConcurrentMultimapWithHeadElement<Boolean, Integer> multimap =
new ConcurrentMultimapWithHeadElement<>();
private final AtomicInteger actionCount = new AtomicInteger(0);
private StressTester() {
super(
200,
1,
TimeUnit.SECONDS,
/*failFastOnException=*/ true,
"action-graph-test",
AbstractQueueVisitor.EXECUTOR_FACTORY,
ErrorClassifier.DEFAULT);
}
private void addAndRemove(final Boolean key, final Integer add, final Integer remove) {
execute(
new Runnable() {
@Override
public void run() {
assertThat(multimap.putAndGet(key, add)).isNotNull();
multimap.remove(key, remove);
doRandom();
}
});
}
private Integer getRandomInt() {
return (int) Math.round(Math.random() * 3.0);
}
private void doRandom() {
if (actionCount.incrementAndGet() > 100000) {
return;
}
Boolean key = Math.random() < 0.5;
addAndRemove(key, getRandomInt(), getRandomInt());
}
private void work() throws InterruptedException {
awaitQuiescence(/*interruptWorkers=*/ true);
}
}
@Test
public void testStressTest() throws Exception {
StressTester stressTester = new StressTester();
stressTester.doRandom();
stressTester.work();
}
}
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