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// Copyright 2015 Google Inc. 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.concurrent;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertSame;
import com.google.common.base.Throwables;
import com.google.common.util.concurrent.MoreExecutors;
import com.google.devtools.build.lib.testutil.TestUtils;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
/** Base class for tests for {@link KeyedFrequencyStore} implementations. */
public abstract class KeyedFrequencyStoreTest {
private static final int NUM_EXECUTOR_THREADS = 1000;
private ExecutorService executorService;
private ThrowableRecordingRunnableWrapper wrapper;
private KeyedFrequencyStore<String, Object> store;
protected abstract KeyedFrequencyStore<String, Object> makeFreshStore();
@Before
public void setUp_KeyedFrequencyStoreTest() {
store = makeFreshStore();
executorService = Executors.newFixedThreadPool(NUM_EXECUTOR_THREADS);
wrapper = new ThrowableRecordingRunnableWrapper("KeyedFrequencyStoreTest");
}
@After
public void tearDown_KeyedFrequencyStoreTest() {
store = null;
MoreExecutors.shutdownAndAwaitTermination(executorService, TestUtils.WAIT_TIMEOUT_SECONDS,
TimeUnit.SECONDS);
}
@Test
public void zeroFrequency() {
store.put("a", new Object(), 0);
assertSame(null, store.consume("a"));
}
@Test
public void simpleSingleThreaded() {
int frequency = 100;
Object objA = new Object();
store.put("a", objA, frequency);
for (int i = 0; i < frequency; i++) {
assertSame(objA, store.consume("a"));
}
assertSame(null, store.consume("a"));
assertSame(null, store.consume("a"));
}
@Test
public void simpleMultiThreaded() throws Exception {
int extra = 100;
int frequency = NUM_EXECUTOR_THREADS - extra;
final Object objA = new Object();
store.put("a", objA, frequency);
final AtomicInteger nullCount = new AtomicInteger(0);
final AtomicInteger nonNullCount = new AtomicInteger(0);
Runnable runnable = new Runnable() {
@Override
public void run() {
Object obj = store.consume("a");
if (obj == null) {
nullCount.incrementAndGet();
} else {
assertSame(objA, obj);
nonNullCount.incrementAndGet();
}
}
};
for (int i = 0; i < NUM_EXECUTOR_THREADS; i++) {
executorService.submit(wrapper.wrap(runnable));
}
boolean interrupted = ExecutorUtil.interruptibleShutdown(executorService);
Throwables.propagateIfPossible(wrapper.getFirstThrownError());
if (interrupted) {
Thread.currentThread().interrupt();
throw new InterruptedException();
}
assertEquals(frequency, nonNullCount.get());
assertEquals(extra, nullCount.get());
}
}
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