Java example source code file (AtomicLongMapTest.java)

This example Java source code file (AtomicLongMapTest.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

atomiclongmap, gwtcompatible, gwtincompatible, interruptedexception, iterations, max_addend, nullpointertester, object, override, random, runnable, set, string, testcase, threading, threads, util

The AtomicLongMapTest.java Java example source code

/*
 * Copyright (C) 2011 The Guava Authors
 *
 * 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.common.util.concurrent;

import com.google.common.annotations.GwtCompatible;
import com.google.common.annotations.GwtIncompatible;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Sets;
import com.google.common.testing.NullPointerTester;

import junit.framework.TestCase;

import java.util.Map;
import java.util.Random;
import java.util.Set;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicLong;

/**
 * Tests for {@link AtomicLongMap}.
 *
 * @author mike nonemacher
 */
@GwtCompatible(emulated = true)
public class AtomicLongMapTest extends TestCase {
  private static final int ITERATIONS = 100;
  private static final int MAX_ADDEND = 100;

  private Random random = new Random(301);

  @GwtIncompatible // NullPointerTester
  public void testNulls() {
    NullPointerTester tester = new NullPointerTester();
    tester.testAllPublicConstructors(AtomicLongMap.class);
    tester.testAllPublicStaticMethods(AtomicLongMap.class);
    AtomicLongMap<Object> map = AtomicLongMap.create();
    tester.testAllPublicInstanceMethods(map);
  }

  public void testCreate_map() {
    Map<String, Long> in = ImmutableMap.of("1", 1L, "2", 2L, "3", 3L);
    AtomicLongMap<String> map = AtomicLongMap.create(in);
    assertFalse(map.isEmpty());
    assertSame(3, map.size());
    assertTrue(map.containsKey("1"));
    assertTrue(map.containsKey("2"));
    assertTrue(map.containsKey("3"));
    assertEquals(1L, map.get("1"));
    assertEquals(2L, map.get("2"));
    assertEquals(3L, map.get("3"));
  }

  public void testIncrementAndGet() {
    AtomicLongMap<String> map = AtomicLongMap.create();
    String key = "key";
    for (int i = 0; i < ITERATIONS; i++) {
      long before = map.get(key);
      long result = map.incrementAndGet(key);
      long after = map.get(key);
      assertEquals(before + 1, after);
      assertEquals(after, result);
    }
    assertEquals(1, map.size());
    assertTrue(!map.isEmpty());
    assertTrue(map.containsKey(key));
    assertEquals(ITERATIONS, (int) map.get(key));
  }

  public void testIncrementAndGet_zero() {
    AtomicLongMap<String> map = AtomicLongMap.create();
    String key = "key";
    assertEquals(0L, map.get(key));
    assertFalse(map.containsKey(key));

    assertEquals(1L, map.incrementAndGet(key));
    assertEquals(1L, map.get(key));

    assertEquals(0L, map.decrementAndGet(key));
    assertEquals(0L, map.get(key));
    assertTrue(map.containsKey(key));

    assertEquals(1L, map.incrementAndGet(key));
    assertEquals(1L, map.get(key));
  }

  public void testGetAndIncrement() {
    AtomicLongMap<String> map = AtomicLongMap.create();
    String key = "key";
    for (int i = 0; i < ITERATIONS; i++) {
      long before = map.get(key);
      long result = map.getAndIncrement(key);
      long after = map.get(key);
      assertEquals(before + 1, after);
      assertEquals(before, result);
    }
    assertEquals(1, map.size());
    assertTrue(!map.isEmpty());
    assertTrue(map.containsKey(key));
    assertEquals(ITERATIONS, (int) map.get(key));
  }

  public void testGetAndIncrement_zero() {
    AtomicLongMap<String> map = AtomicLongMap.create();
    String key = "key";
    assertEquals(0L, map.get(key));
    assertFalse(map.containsKey(key));

    assertEquals(0L, map.getAndIncrement(key));
    assertEquals(1L, map.get(key));

    assertEquals(1L, map.getAndDecrement(key));
    assertEquals(0L, map.get(key));
    assertTrue(map.containsKey(key));

    assertEquals(0L, map.getAndIncrement(key));
    assertEquals(1L, map.get(key));
  }

  public void testDecrementAndGet() {
    AtomicLongMap<String> map = AtomicLongMap.create();
    String key = "key";
    for (int i = 0; i < ITERATIONS; i++) {
      long before = map.get(key);
      long result = map.decrementAndGet(key);
      long after = map.get(key);
      assertEquals(before - 1, after);
      assertEquals(after, result);
    }
    assertEquals(1, map.size());
    assertTrue(!map.isEmpty());
    assertTrue(map.containsKey(key));
    assertEquals(-1 * ITERATIONS, (int) map.get(key));
  }

  public void testDecrementAndGet_zero() {
    AtomicLongMap<String> map = AtomicLongMap.create();
    String key = "key";
    assertEquals(0L, map.get(key));
    assertFalse(map.containsKey(key));

    assertEquals(-1L, map.decrementAndGet(key));
    assertEquals(-1L, map.get(key));

    assertEquals(0L, map.incrementAndGet(key));
    assertEquals(0L, map.get(key));
    assertTrue(map.containsKey(key));

    assertEquals(-1L, map.decrementAndGet(key));
    assertEquals(-1L, map.get(key));
  }

  public void testGetAndDecrement() {
    AtomicLongMap<String> map = AtomicLongMap.create();
    String key = "key";
    for (int i = 0; i < ITERATIONS; i++) {
      long before = map.get(key);
      long result = map.getAndDecrement(key);
      long after = map.get(key);
      assertEquals(before - 1, after);
      assertEquals(before, result);
    }
    assertEquals(1, map.size());
    assertTrue(!map.isEmpty());
    assertTrue(map.containsKey(key));
    assertEquals(-1 * ITERATIONS, (int) map.get(key));
  }

  public void testGetAndDecrement_zero() {
    AtomicLongMap<String> map = AtomicLongMap.create();
    String key = "key";
    assertEquals(0L, map.get(key));
    assertFalse(map.containsKey(key));

    assertEquals(0L, map.getAndDecrement(key));
    assertEquals(-1L, map.get(key));

    assertEquals(-1L, map.getAndIncrement(key));
    assertEquals(0L, map.get(key));
    assertTrue(map.containsKey(key));

    assertEquals(0L, map.getAndDecrement(key));
    assertEquals(-1L, map.get(key));
  }

  public void testAddAndGet() {
    AtomicLongMap<String> map = AtomicLongMap.create();
    String key = "key";
    long addend = random.nextInt(MAX_ADDEND);
    for (int i = 0; i < ITERATIONS; i++) {
      long before = map.get(key);
      long result = map.addAndGet(key, addend);
      long after = map.get(key);
      assertEquals(before + addend, after);
      assertEquals(after, result);
      addend = after;
    }
    assertEquals(1, map.size());
    assertTrue(!map.isEmpty());
    assertTrue(map.containsKey(key));
  }

  public void testAddAndGet_zero() {
    AtomicLongMap<String> map = AtomicLongMap.create();
    String key = "key";
    long value = random.nextInt(MAX_ADDEND);
    assertEquals(0L, map.get(key));
    assertFalse(map.containsKey(key));

    assertEquals(value, map.addAndGet(key, value));
    assertEquals(value, map.get(key));

    assertEquals(0L, map.addAndGet(key, -1 * value));
    assertEquals(0L, map.get(key));
    assertTrue(map.containsKey(key));

    assertEquals(value, map.addAndGet(key, value));
    assertEquals(value, map.get(key));
  }

  public void testGetAndAdd() {
    AtomicLongMap<String> map = AtomicLongMap.create();
    String key = "key";
    long addend = random.nextInt(MAX_ADDEND);
    for (int i = 0; i < ITERATIONS; i++) {
      long before = map.get(key);
      long result = map.getAndAdd(key, addend);
      long after = map.get(key);
      assertEquals(before + addend, after);
      assertEquals(before, result);
      addend = after;
    }
    assertEquals(1, map.size());
    assertTrue(!map.isEmpty());
    assertTrue(map.containsKey(key));
  }

  public void testGetAndAdd_zero() {
    AtomicLongMap<String> map = AtomicLongMap.create();
    String key = "key";
    long value = random.nextInt(MAX_ADDEND);
    assertEquals(0L, map.get(key));
    assertFalse(map.containsKey(key));

    assertEquals(0L, map.getAndAdd(key, value));
    assertEquals(value, map.get(key));

    assertEquals(value, map.getAndAdd(key, -1 * value));
    assertEquals(0L, map.get(key));
    assertTrue(map.containsKey(key));

    assertEquals(0L, map.getAndAdd(key, value));
    assertEquals(value, map.get(key));
  }

  public void testPut() {
    AtomicLongMap<String> map = AtomicLongMap.create();
    String key = "key";
    long newValue = random.nextInt(MAX_ADDEND);
    for (int i = 0; i < ITERATIONS; i++) {
      long before = map.get(key);
      long result = map.put(key, newValue);
      long after = map.get(key);
      assertEquals(newValue, after);
      assertEquals(before, result);
      newValue += newValue;
    }
    assertEquals(1, map.size());
    assertTrue(!map.isEmpty());
    assertTrue(map.containsKey(key));
  }

  public void testPut_zero() {
    AtomicLongMap<String> map = AtomicLongMap.create();
    String key = "key";
    long value = random.nextInt(MAX_ADDEND);
    assertEquals(0L, map.get(key));
    assertFalse(map.containsKey(key));

    assertEquals(0L, map.put(key, value));
    assertEquals(value, map.get(key));

    assertEquals(value, map.put(key, 0L));
    assertEquals(0L, map.get(key));
    assertTrue(map.containsKey(key));

    assertEquals(0L, map.put(key, value));
    assertEquals(value, map.get(key));
  }

  public void testPutAll() {
    Map<String, Long> in = ImmutableMap.of("1", 1L, "2", 2L, "3", 3L);
    AtomicLongMap<String> map = AtomicLongMap.create();
    assertTrue(map.isEmpty());
    assertSame(0, map.size());
    assertFalse(map.containsKey("1"));
    assertFalse(map.containsKey("2"));
    assertFalse(map.containsKey("3"));
    assertEquals(0L, map.get("1"));
    assertEquals(0L, map.get("2"));
    assertEquals(0L, map.get("3"));

    map.putAll(in);
    assertFalse(map.isEmpty());
    assertSame(3, map.size());
    assertTrue(map.containsKey("1"));
    assertTrue(map.containsKey("2"));
    assertTrue(map.containsKey("3"));
    assertEquals(1L, map.get("1"));
    assertEquals(2L, map.get("2"));
    assertEquals(3L, map.get("3"));
  }

  public void testPutIfAbsent() {
    AtomicLongMap<String> map = AtomicLongMap.create();
    String key = "key";
    long newValue = random.nextInt(MAX_ADDEND);
    for (int i = 0; i < ITERATIONS; i++) {
      long before = map.get(key);
      long result = map.putIfAbsent(key, newValue);
      long after = map.get(key);
      assertEquals(before, result);
      assertEquals(before == 0 ? newValue : before, after);

      map.remove(key);
      before = map.get(key);
      result = map.putIfAbsent(key, newValue);
      after = map.get(key);
      assertEquals(0, before);
      assertEquals(before, result);
      assertEquals(newValue, after);

      map.put(key, 0L);
      before = map.get(key);
      result = map.putIfAbsent(key, newValue);
      after = map.get(key);
      assertEquals(0, before);
      assertEquals(before, result);
      assertEquals(newValue, after);

      newValue += newValue;
    }
    assertEquals(1, map.size());
    assertTrue(!map.isEmpty());
    assertTrue(map.containsKey(key));
  }

  public void testPutIfAbsent_zero() {
    AtomicLongMap<String> map = AtomicLongMap.create();
    String key = "key";
    long value = random.nextInt(MAX_ADDEND);
    assertEquals(0L, map.get(key));
    assertFalse(map.containsKey(key));

    assertEquals(0L, map.putIfAbsent(key, value));
    assertEquals(value, map.get(key));

    assertEquals(value, map.put(key, 0L));
    assertEquals(0L, map.get(key));
    assertTrue(map.containsKey(key));

    assertEquals(0L, map.putIfAbsent(key, value));
    assertEquals(value, map.get(key));
  }

  public void testReplace() {
    AtomicLongMap<String> map = AtomicLongMap.create();
    String key = "key";
    long newValue = random.nextInt(MAX_ADDEND);
    for (int i = 0; i < ITERATIONS; i++) {
      long before = map.get(key);
      assertFalse(map.replace(key, before + 1, newValue + 1));
      assertFalse(map.replace(key, before - 1, newValue - 1));
      assertTrue(map.replace(key, before, newValue));
      long after = map.get(key);
      assertEquals(newValue, after);
      newValue += newValue;
    }
    assertEquals(1, map.size());
    assertTrue(!map.isEmpty());
    assertTrue(map.containsKey(key));
  }

  public void testReplace_zero() {
    AtomicLongMap<String> map = AtomicLongMap.create();
    String key = "key";
    long value = random.nextInt(MAX_ADDEND);
    assertEquals(0L, map.get(key));
    assertFalse(map.containsKey(key));

    assertTrue(map.replace(key, 0L, value));
    assertEquals(value, map.get(key));

    assertTrue(map.replace(key, value, 0L));
    assertEquals(0L, map.get(key));
    assertTrue(map.containsKey(key));

    assertTrue(map.replace(key, 0L, value));
    assertEquals(value, map.get(key));
  }

  public void testRemove() {
    AtomicLongMap<String> map = AtomicLongMap.create();
    String key = "key";
    assertEquals(0, map.size());
    assertTrue(map.isEmpty());
    assertEquals(0L, map.remove(key));

    long newValue = random.nextInt(MAX_ADDEND);
    for (int i = 0; i < ITERATIONS; i++) {
      map.put(key, newValue);
      assertTrue(map.containsKey(key));

      long before = map.get(key);
      long result = map.remove(key);
      long after = map.get(key);
      assertFalse(map.containsKey(key));
      assertEquals(before, result);
      assertEquals(0L, after);
      newValue += newValue;
    }
    assertEquals(0, map.size());
    assertTrue(map.isEmpty());
  }

  public void testRemove_zero() {
    AtomicLongMap<String> map = AtomicLongMap.create();
    String key = "key";
    assertEquals(0L, map.get(key));
    assertFalse(map.containsKey(key));

    assertEquals(0L, map.remove(key));
    assertEquals(0L, map.get(key));
    assertFalse(map.containsKey(key));

    assertEquals(0L, map.put(key, 0L));
    assertEquals(0L, map.get(key));
    assertTrue(map.containsKey(key));

    assertEquals(0L, map.remove(key));
    assertEquals(0L, map.get(key));
    assertFalse(map.containsKey(key));
  }

  public void testRemoveValue() {
    AtomicLongMap<String> map = AtomicLongMap.create();
    String key = "key";
    assertEquals(0, map.size());
    assertTrue(map.isEmpty());
    assertFalse(map.remove(key, 0L));

    long newValue = random.nextInt(MAX_ADDEND);
    for (int i = 0; i < ITERATIONS; i++) {
      map.put(key, newValue);
      assertTrue(map.containsKey(key));

      long before = map.get(key);
      assertFalse(map.remove(key, newValue + 1));
      assertFalse(map.remove(key, newValue - 1));
      assertTrue(map.remove(key, newValue));
      long after = map.get(key);
      assertFalse(map.containsKey(key));
      assertEquals(0L, after);
      newValue += newValue;
    }
    assertEquals(0, map.size());
    assertTrue(map.isEmpty());
  }

  public void testRemoveValue_zero() {
    AtomicLongMap<String> map = AtomicLongMap.create();
    String key = "key";
    assertEquals(0L, map.get(key));
    assertFalse(map.containsKey(key));

    assertFalse(map.remove(key, 0L));
    assertEquals(0L, map.get(key));
    assertFalse(map.containsKey(key));

    assertEquals(0L, map.put(key, 0L));
    assertEquals(0L, map.get(key));
    assertTrue(map.containsKey(key));

    assertTrue(map.remove(key, 0L));
    assertEquals(0L, map.get(key));
    assertFalse(map.containsKey(key));
  }

  public void testRemoveZeros() {
    AtomicLongMap<Object> map = AtomicLongMap.create();
    Set<Object> nonZeroKeys = Sets.newHashSet();
    for (int i = 0; i < ITERATIONS; i++) {
      Object key = new Object();
      long value = i % 2;
      map.put(key, value);
      if (value != 0L) {
        nonZeroKeys.add(key);
      }
    }
    assertEquals(ITERATIONS, map.size());
    assertTrue(map.asMap().containsValue(0L));

    map.removeAllZeros();
    assertFalse(map.asMap().containsValue(0L));
    assertEquals(ITERATIONS / 2, map.size());
    assertEquals(nonZeroKeys, map.asMap().keySet());
  }

  public void testClear() {
    AtomicLongMap<Object> map = AtomicLongMap.create();
    for (int i = 0; i < ITERATIONS; i++) {
      map.put(new Object(), i);
    }
    assertEquals(ITERATIONS, map.size());

    map.clear();
    assertEquals(0, map.size());
    assertTrue(map.isEmpty());
  }

  public void testSum() {
    AtomicLongMap<Object> map = AtomicLongMap.create();
    long sum = 0;
    for (int i = 0; i < ITERATIONS; i++) {
      map.put(new Object(), i);
      sum += i;
    }
    assertEquals(ITERATIONS, map.size());
    assertEquals(sum, map.sum());
  }

  public void testEmpty() {
    AtomicLongMap<String> map = AtomicLongMap.create();
    assertEquals(0L, map.get("a"));
    assertEquals(0, map.size());
    assertTrue(map.isEmpty());
    assertFalse(map.remove("a", 1L));
    assertFalse(map.remove("a", 0L));
    assertFalse(map.replace("a", 1L, 0L));
  }

  @GwtIncompatible // threads
  public void testModify_basher() throws InterruptedException {
    int nTasks = 3000;
    int nThreads = 100;
    final int getsPerTask = 1000;
    final int deltaRange = 10000;
    final String key = "key";

    final AtomicLong sum = new AtomicLong();
    final AtomicLongMap<String> map = AtomicLongMap.create();

    ExecutorService threadPool = Executors.newFixedThreadPool(nThreads);
    for (int i = 0; i < nTasks; i++) {
      threadPool.submit(new Runnable() {
        @Override public void run() {
          int threadSum = 0;
          for (int j = 0; j < getsPerTask; j++) {
            long delta = random.nextInt(deltaRange);
            int behavior = random.nextInt(10);
            switch (behavior) {
              case 0:
                map.incrementAndGet(key);
                threadSum++;
                break;
              case 1:
                map.decrementAndGet(key);
                threadSum--;
                break;
              case 2:
                map.addAndGet(key, delta);
                threadSum += delta;
                break;
              case 3:
                map.getAndIncrement(key);
                threadSum++;
                break;
              case 4:
                map.getAndDecrement(key);
                threadSum--;
                break;
              case 5:
                map.getAndAdd(key, delta);
                threadSum += delta;
                break;
              case 6:
                long oldValue = map.put(key, delta);
                threadSum += delta - oldValue;
                break;
              case 7:
                oldValue = map.get(key);
                if (map.replace(key, oldValue, delta)) {
                  threadSum += delta - oldValue;
                }
                break;
              case 8:
                oldValue = map.remove(key);
                threadSum -= oldValue;
                break;
              case 9:
                oldValue = map.get(key);
                if (map.remove(key, oldValue)) {
                  threadSum -= oldValue;
                }
                break;
              default:
                throw new AssertionError();
            }
          }
          sum.addAndGet(threadSum);
        }
      });
    }

    threadPool.shutdown();
    assertTrue(threadPool.awaitTermination(300, TimeUnit.SECONDS));

    assertEquals(sum.get(), map.get(key));
  }
}