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package org.apache.activemq.artemis.utils.collections;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Random;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.function.LongFunction;
import com.google.common.collect.Lists;
import org.junit.Test;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.assertNull;
public class ConcurrentLongHashMapTest {
@Test
public void simpleInsertions() {
ConcurrentLongHashMap<String> map = new ConcurrentLongHashMap<>(16);
assertTrue(map.isEmpty());
assertNull(map.put(1, "one"));
assertFalse(map.isEmpty());
assertNull(map.put(2, "two"));
assertNull(map.put(3, "three"));
assertEquals(map.size(), 3);
assertEquals(map.get(1), "one");
assertEquals(map.size(), 3);
assertEquals(map.remove(1), "one");
assertEquals(map.size(), 2);
assertEquals(map.get(1), null);
assertEquals(map.get(5), null);
assertEquals(map.size(), 2);
assertNull(map.put(1, "one"));
assertEquals(map.size(), 3);
assertEquals(map.put(1, "uno"), "one");
assertEquals(map.size(), 3);
}
@Test
public void testRemove() {
ConcurrentLongHashMap<String> map = new ConcurrentLongHashMap<>();
assertTrue(map.isEmpty());
assertNull(map.put(1, "one"));
assertFalse(map.isEmpty());
assertFalse(map.remove(0, "zero"));
assertFalse(map.remove(1, "uno"));
assertFalse(map.isEmpty());
assertTrue(map.remove(1, "one"));
assertTrue(map.isEmpty());
}
@Test
public void testNegativeUsedBucketCount() {
ConcurrentLongHashMap<String> map = new ConcurrentLongHashMap<>(16, 1);
map.put(0, "zero");
assertEquals(1, map.getUsedBucketCount());
map.put(0, "zero1");
assertEquals(1, map.getUsedBucketCount());
map.remove(0);
assertEquals(0, map.getUsedBucketCount());
map.remove(0);
assertEquals(0, map.getUsedBucketCount());
}
@Test
public void testRehashing() {
int n = 16;
ConcurrentLongHashMap<Integer> map = new ConcurrentLongHashMap<>(n / 2, 1);
assertEquals(map.capacity(), n);
assertEquals(map.size(), 0);
for (int i = 0; i < n; i++) {
map.put(i, i);
}
assertEquals(map.capacity(), 2 * n);
assertEquals(map.size(), n);
}
@Test
public void testRehashingWithDeletes() {
int n = 16;
ConcurrentLongHashMap<Integer> map = new ConcurrentLongHashMap<>(n / 2, 1);
assertEquals(map.capacity(), n);
assertEquals(map.size(), 0);
for (int i = 0; i < n / 2; i++) {
map.put(i, i);
}
for (int i = 0; i < n / 2; i++) {
map.remove(i);
}
for (int i = n; i < (2 * n); i++) {
map.put(i, i);
}
assertEquals(map.capacity(), 2 * n);
assertEquals(map.size(), n);
}
@Test
public void concurrentInsertions() throws Throwable {
ConcurrentLongHashMap<String> map = new ConcurrentLongHashMap<>();
ExecutorService executor = Executors.newCachedThreadPool();
final int nThreads = 16;
final int N = 100_000;
String value = "value";
List<Future<?>> futures = new ArrayList<>();
for (int i = 0; i < nThreads; i++) {
final int threadIdx = i;
futures.add(executor.submit(() -> {
Random random = new Random();
for (int j = 0; j < N; j++) {
long key = random.nextLong();
// Ensure keys are uniques
key -= key % (threadIdx + 1);
map.put(key, value);
}
}));
}
for (Future<?> future : futures) {
future.get();
}
assertEquals(map.size(), N * nThreads);
executor.shutdown();
}
@Test
public void concurrentInsertionsAndReads() throws Throwable {
ConcurrentLongHashMap<String> map = new ConcurrentLongHashMap<>();
ExecutorService executor = Executors.newCachedThreadPool();
final int nThreads = 16;
final int N = 100_000;
String value = "value";
List<Future<?>> futures = new ArrayList<>();
for (int i = 0; i < nThreads; i++) {
final int threadIdx = i;
futures.add(executor.submit(() -> {
Random random = new Random();
for (int j = 0; j < N; j++) {
long key = random.nextLong();
// Ensure keys are uniques
key -= key % (threadIdx + 1);
map.put(key, value);
}
}));
}
for (Future<?> future : futures) {
future.get();
}
assertEquals(map.size(), N * nThreads);
executor.shutdown();
}
@Test
public void testIteration() {
ConcurrentLongHashMap<String> map = new ConcurrentLongHashMap<>();
assertEquals(map.keys(), Collections.emptyList());
assertEquals(map.values(), Collections.emptyList());
map.put(0, "zero");
assertEquals(map.keys(), Lists.newArrayList(0L));
assertEquals(map.values(), Lists.newArrayList("zero"));
map.remove(0);
assertEquals(map.keys(), Collections.emptyList());
assertEquals(map.values(), Collections.emptyList());
map.put(0, "zero");
map.put(1, "one");
map.put(2, "two");
List<Long> keys = map.keys();
Collections.sort(keys);
assertEquals(keys, Lists.newArrayList(0L, 1L, 2L));
List<String> values = map.values();
Collections.sort(values);
assertEquals(values, Lists.newArrayList("one", "two", "zero"));
map.put(1, "uno");
keys = map.keys();
Collections.sort(keys);
assertEquals(keys, Lists.newArrayList(0L, 1L, 2L));
values = map.values();
Collections.sort(values);
assertEquals(values, Lists.newArrayList("two", "uno", "zero"));
map.clear();
assertTrue(map.isEmpty());
}
@Test
public void testHashConflictWithDeletion() {
final int Buckets = 16;
ConcurrentLongHashMap<String> map = new ConcurrentLongHashMap<>(Buckets, 1);
// Pick 2 keys that fall into the same bucket
long key1 = 1;
long key2 = 27;
int bucket1 = ConcurrentLongHashMap.signSafeMod(ConcurrentLongHashMap.hash(key1), Buckets);
int bucket2 = ConcurrentLongHashMap.signSafeMod(ConcurrentLongHashMap.hash(key2), Buckets);
assertEquals(bucket1, bucket2);
assertEquals(map.put(key1, "value-1"), null);
assertEquals(map.put(key2, "value-2"), null);
assertEquals(map.size(), 2);
assertEquals(map.remove(key1), "value-1");
assertEquals(map.size(), 1);
assertEquals(map.put(key1, "value-1-overwrite"), null);
assertEquals(map.size(), 2);
assertEquals(map.remove(key1), "value-1-overwrite");
assertEquals(map.size(), 1);
assertEquals(map.put(key2, "value-2-overwrite"), "value-2");
assertEquals(map.get(key2), "value-2-overwrite");
assertEquals(map.size(), 1);
assertEquals(map.remove(key2), "value-2-overwrite");
assertTrue(map.isEmpty());
}
@Test
public void testPutIfAbsent() {
ConcurrentLongHashMap<String> map = new ConcurrentLongHashMap<>();
assertEquals(map.putIfAbsent(1, "one"), null);
assertEquals(map.get(1), "one");
assertEquals(map.putIfAbsent(1, "uno"), "one");
assertEquals(map.get(1), "one");
}
@Test
public void testComputeIfAbsent() {
ConcurrentLongHashMap<Integer> map = new ConcurrentLongHashMap<>(16, 1);
AtomicInteger counter = new AtomicInteger();
LongFunction<Integer> provider = key -> counter.getAndIncrement();
assertEquals(map.computeIfAbsent(0, provider).intValue(), 0);
assertEquals(map.get(0).intValue(), 0);
assertEquals(map.computeIfAbsent(1, provider).intValue(), 1);
assertEquals(map.get(1).intValue(), 1);
assertEquals(map.computeIfAbsent(1, provider).intValue(), 1);
assertEquals(map.get(1).intValue(), 1);
assertEquals(map.computeIfAbsent(2, provider).intValue(), 2);
assertEquals(map.get(2).intValue(), 2);
}
int Iterations = 1;
int ReadIterations = 100;
int N = 1_000_000;
public void benchConcurrentLongHashMap() throws Exception {
// public static void main(String args[]) {
ConcurrentLongHashMap<String> map = new ConcurrentLongHashMap<>(N, 1);
for (long i = 0; i < Iterations; i++) {
for (int j = 0; j < N; j++) {
map.put(i, "value");
}
for (long h = 0; h < ReadIterations; h++) {
for (int j = 0; j < N; j++) {
map.get(i);
}
}
for (int j = 0; j < N; j++) {
map.remove(i);
}
}
}
public void benchConcurrentHashMap() throws Exception {
ConcurrentHashMap<Long, String> map = new ConcurrentHashMap<>(N, 0.66f, 1);
for (long i = 0; i < Iterations; i++) {
for (int j = 0; j < N; j++) {
map.put(i, "value");
}
for (long h = 0; h < ReadIterations; h++) {
for (int j = 0; j < N; j++) {
map.get(i);
}
}
for (int j = 0; j < N; j++) {
map.remove(i);
}
}
}
void benchHashMap() throws Exception {
HashMap<Long, String> map = new HashMap<>(N, 0.66f);
for (long i = 0; i < Iterations; i++) {
for (int j = 0; j < N; j++) {
map.put(i, "value");
}
for (long h = 0; h < ReadIterations; h++) {
for (int j = 0; j < N; j++) {
map.get(i);
}
}
for (int j = 0; j < N; j++) {
map.remove(i);
}
}
}
public static void main(String[] args) throws Exception {
ConcurrentLongHashMapTest t = new ConcurrentLongHashMapTest();
long start = System.nanoTime();
// t.benchHashMap();
long end = System.nanoTime();
System.out.println("HM: " + TimeUnit.NANOSECONDS.toMillis(end - start) + " ms");
start = System.nanoTime();
t.benchConcurrentHashMap();
end = System.nanoTime();
System.out.println("CHM: " + TimeUnit.NANOSECONDS.toMillis(end - start) + " ms");
start = System.nanoTime();
// t.benchConcurrentLongHashMap();
end = System.nanoTime();
System.out.println("CLHM: " + TimeUnit.NANOSECONDS.toMillis(end - start) + " ms");
}
}