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// Copyright 2024 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.collect;
import static com.google.common.truth.Truth.assertThat;
import com.google.common.collect.ImmutableList;
import com.google.devtools.build.lib.testutil.TestUtils;
import java.util.ArrayList;
import java.util.Collections;
import java.util.concurrent.ForkJoinPool;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
import org.junit.BeforeClass;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
@RunWith(JUnit4.class)
public final class ConcurrentIdentitySetTest {
private static final int PARALLELISM = 12;
private static final int UNIQUE_ELEMENTS = 10000;
private static final ImmutableList<Object> TEST_DATA = createTestObjects();
/** Ensures that {@link #TEST_DATA} is populated before any test runs. */
@BeforeClass
public static void warmup() {
for (Object obj : TEST_DATA) {
assertThat(obj).isNotNull();
}
}
@Test
public void testDedupe() {
ConcurrentIdentitySet deduper = new ConcurrentIdentitySet(/* sizeHint= */ UNIQUE_ELEMENTS);
assertThat(runDedup(deduper::add)).isEqualTo(UNIQUE_ELEMENTS);
}
@Test
public void testResize() {
ConcurrentIdentitySet deduper = new ConcurrentIdentitySet(/* sizeHint= */ 0);
assertThat(runDedup(deduper::add)).isEqualTo(UNIQUE_ELEMENTS);
}
private static int runDedup(BooleanFunction deduper) {
ForkJoinPool pool = new ForkJoinPool(PARALLELISM);
AtomicInteger nextUnused = new AtomicInteger(0);
AtomicInteger uniqueCount = new AtomicInteger(0);
for (int i = 0; i < PARALLELISM; ++i) {
pool.execute(
() -> {
int next = 0;
while ((next = nextUnused.getAndIncrement()) < TEST_DATA.size()) {
if (deduper.apply(TEST_DATA.get(next))) {
uniqueCount.incrementAndGet();
}
}
});
}
assertThat(pool.awaitQuiescence(TestUtils.WAIT_TIMEOUT_SECONDS, TimeUnit.SECONDS)).isTrue();
return uniqueCount.get();
}
private static ImmutableList<Object> createTestObjects() {
ArrayList<Object> data = new ArrayList<>((UNIQUE_ELEMENTS * (UNIQUE_ELEMENTS + 1)) / 2);
for (int i = 1; i <= UNIQUE_ELEMENTS; ++i) {
Object next = new Object();
for (int j = 0; j < i; ++j) {
data.add(next);
}
}
Collections.shuffle(data);
return ImmutableList.copyOf(data);
}
private interface BooleanFunction {
boolean apply(Object obj);
}
}