Examples of com.google.common.testing.FakeTicker

com.google.common.testing.FakeTicker
A Ticker whose value can be advanced programmatically in test.
This class is thread-safe. @author Jige Yu @since Guava release 10

  private static final long EXPIRING_TIME = 1000;
  private static final int VALUE_PREFIX = 12345;
  private static final String KEY_PREFIX = "key prefix:";


  public void testExpiration_expireAfterWrite() {
    FakeTicker ticker = new FakeTicker();
    CountingRemovalListener<String, Integer> removalListener = countingRemovalListener();
    WatchedCreatorLoader loader = new WatchedCreatorLoader();
    LoadingCache<String, Integer> cache = CacheBuilder.newBuilder()
        .expireAfterWrite(EXPIRING_TIME, MILLISECONDS)
        .removalListener(removalListener)

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        .build(loader);
    checkExpiration(cache, loader, ticker, removalListener);
  }


  public void testExpiration_expireAfterAccess() {
    FakeTicker ticker = new FakeTicker();
    CountingRemovalListener<String, Integer> removalListener = countingRemovalListener();
    WatchedCreatorLoader loader = new WatchedCreatorLoader();
    LoadingCache<String, Integer> cache = CacheBuilder.newBuilder()
        .expireAfterAccess(EXPIRING_TIME, MILLISECONDS)
        .removalListener(removalListener)

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    assertEquals("Eviction notifications must be received", 10,
        removalListener.getCount());
  }


  public void testExpiringGet_expireAfterWrite() {
    FakeTicker ticker = new FakeTicker();
    CountingRemovalListener<String, Integer> removalListener = countingRemovalListener();
    WatchedCreatorLoader loader = new WatchedCreatorLoader();
    LoadingCache<String, Integer> cache = CacheBuilder.newBuilder()
        .expireAfterWrite(EXPIRING_TIME, MILLISECONDS)
        .removalListener(removalListener)

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        .build(loader);
    runExpirationTest(cache, loader, ticker, removalListener);
  }


  public void testExpiringGet_expireAfterAccess() {
    FakeTicker ticker = new FakeTicker();
    CountingRemovalListener<String, Integer> removalListener = countingRemovalListener();
    WatchedCreatorLoader loader = new WatchedCreatorLoader();
    LoadingCache<String, Integer> cache = CacheBuilder.newBuilder()
        .expireAfterAccess(EXPIRING_TIME, MILLISECONDS)
        .removalListener(removalListener)

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    assertEquals("Eviction notifications must be received", 21,
        removalListener.getCount());
  }


  public void testRemovalListener_expireAfterWrite() {
    FakeTicker ticker = new FakeTicker();
    final AtomicInteger evictionCount = new AtomicInteger();
    final AtomicInteger applyCount = new AtomicInteger();
    final AtomicInteger totalSum = new AtomicInteger();


    RemovalListener<Integer, AtomicInteger> removalListener =
        new RemovalListener<Integer, AtomicInteger>() {
          @Override
          public void onRemoval(RemovalNotification<Integer, AtomicInteger> notification) {
            if (notification.wasEvicted()) {
              evictionCount.incrementAndGet();
              totalSum.addAndGet(notification.getValue().get());
            }
          }
        };


    CacheLoader<Integer, AtomicInteger> loader = new CacheLoader<Integer, AtomicInteger>() {
      @Override public AtomicInteger load(Integer key) {
        applyCount.incrementAndGet();
        return new AtomicInteger();
      }
    };


    LoadingCache<Integer, AtomicInteger> cache = CacheBuilder.newBuilder()
        .removalListener(removalListener)
        .expireAfterWrite(10, MILLISECONDS)
        .ticker(ticker)
        .build(loader);


    // Increment 100 times
    for (int i = 0; i < 100; ++i) {
      cache.getUnchecked(10).incrementAndGet();
      ticker.advance(1, MILLISECONDS);
    }


    assertEquals(evictionCount.get() + 1, applyCount.get());
    int remaining = cache.getUnchecked(10).get();
    assertEquals(100, totalSum.get() + remaining);

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    int remaining = cache.getUnchecked(10).get();
    assertEquals(100, totalSum.get() + remaining);
  }


  public void testRemovalScheduler_expireAfterWrite() {
    FakeTicker ticker = new FakeTicker();
    CountingRemovalListener<String, Integer> removalListener = countingRemovalListener();
    WatchedCreatorLoader loader = new WatchedCreatorLoader();
    LoadingCache<String, Integer> cache = CacheBuilder.newBuilder()
        .expireAfterWrite(EXPIRING_TIME, MILLISECONDS)
        .removalListener(removalListener)

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        .build(loader);
    runRemovalScheduler(cache, removalListener, loader, ticker, KEY_PREFIX, EXPIRING_TIME);
  }


  public void testRemovalScheduler_expireAfterAccess() {
    FakeTicker ticker = new FakeTicker();
    CountingRemovalListener<String, Integer> removalListener = countingRemovalListener();
    WatchedCreatorLoader loader = new WatchedCreatorLoader();
    LoadingCache<String, Integer> cache = CacheBuilder.newBuilder()
        .expireAfterAccess(EXPIRING_TIME, MILLISECONDS)
        .removalListener(removalListener)

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        .build(loader);
    runRemovalScheduler(cache, removalListener, loader, ticker, KEY_PREFIX, EXPIRING_TIME);
  }


  public void testRemovalScheduler_expireAfterBoth() {
    FakeTicker ticker = new FakeTicker();
    CountingRemovalListener<String, Integer> removalListener = countingRemovalListener();
    WatchedCreatorLoader loader = new WatchedCreatorLoader();
    LoadingCache<String, Integer> cache = CacheBuilder.newBuilder()
        .expireAfterAccess(EXPIRING_TIME, MILLISECONDS)
        .expireAfterWrite(EXPIRING_TIME, MILLISECONDS)

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    runRemovalScheduler(cache, removalListener, loader, ticker, KEY_PREFIX, EXPIRING_TIME);
  }


  public void testExpirationOrder_access() {
    // test lru within a single segment
    FakeTicker ticker = new FakeTicker();
    IdentityLoader<Integer> loader = identityLoader();
    LoadingCache<Integer, Integer> cache = CacheBuilder.newBuilder()
        .concurrencyLevel(1)
        .expireAfterAccess(11, MILLISECONDS)
        .ticker(ticker)
        .build(loader);
    for (int i = 0; i < 10; i++) {
      cache.getUnchecked(i);
      ticker.advance(1, MILLISECONDS);
    }
    Set<Integer> keySet = cache.asMap().keySet();
    assertThat(keySet).containsExactly(0, 1, 2, 3, 4, 5, 6, 7, 8, 9);


    // 0 expires
    ticker.advance(1, MILLISECONDS);
    assertThat(keySet).containsExactly(1, 2, 3, 4, 5, 6, 7, 8, 9);


    // reorder
    getAll(cache, asList(0, 1, 2));
    CacheTesting.drainRecencyQueues(cache);
    ticker.advance(2, MILLISECONDS);
    assertThat(keySet).containsExactly(3, 4, 5, 6, 7, 8, 9, 0, 1, 2);


    // 3 expires
    ticker.advance(1, MILLISECONDS);
    assertThat(keySet).containsExactly(4, 5, 6, 7, 8, 9, 0, 1, 2);


    // reorder
    getAll(cache, asList(5, 7, 9));
    CacheTesting.drainRecencyQueues(cache);
    assertThat(keySet).containsExactly(4, 6, 8, 0, 1, 2, 5, 7, 9);


    // 4 expires
    ticker.advance(1, MILLISECONDS);
    assertThat(keySet).containsExactly(6, 8, 0, 1, 2, 5, 7, 9);
    ticker.advance(1, MILLISECONDS);
    assertThat(keySet).containsExactly(6, 8, 0, 1, 2, 5, 7, 9);


    // 6 expires
    ticker.advance(1, MILLISECONDS);
    assertThat(keySet).containsExactly(8, 0, 1, 2, 5, 7, 9);
    ticker.advance(1, MILLISECONDS);
    assertThat(keySet).containsExactly(8, 0, 1, 2, 5, 7, 9);


    // 8 expires
    ticker.advance(1, MILLISECONDS);
    assertThat(keySet).containsExactly(0, 1, 2, 5, 7, 9);
  }

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    assertThat(keySet).containsExactly(0, 1, 2, 5, 7, 9);
  }


  public void testExpirationOrder_write() throws ExecutionException {
    // test lru within a single segment
    FakeTicker ticker = new FakeTicker();
    IdentityLoader<Integer> loader = identityLoader();
    LoadingCache<Integer, Integer> cache = CacheBuilder.newBuilder()
        .concurrencyLevel(1)
        .expireAfterWrite(11, MILLISECONDS)
        .ticker(ticker)
        .build(loader);
    for (int i = 0; i < 10; i++) {
      cache.getUnchecked(i);
      ticker.advance(1, MILLISECONDS);
    }
    Set<Integer> keySet = cache.asMap().keySet();
    assertThat(keySet).containsExactly(0, 1, 2, 3, 4, 5, 6, 7, 8, 9);


    // 0 expires
    ticker.advance(1, MILLISECONDS);
    assertThat(keySet).containsExactly(1, 2, 3, 4, 5, 6, 7, 8, 9);


    // get doesn't stop 1 from expiring
    getAll(cache, asList(0, 1, 2));
    CacheTesting.drainRecencyQueues(cache);
    ticker.advance(1, MILLISECONDS);
    assertThat(keySet).containsExactly(2, 3, 4, 5, 6, 7, 8, 9, 0);


    // get(K, Callable) doesn't stop 2 from expiring
    cache.get(2, Callables.returning(-2));
    CacheTesting.drainRecencyQueues(cache);
    ticker.advance(1, MILLISECONDS);
    assertThat(keySet).containsExactly(3, 4, 5, 6, 7, 8, 9, 0);


    // asMap.put saves 3
    cache.asMap().put(3, -3);
    ticker.advance(1, MILLISECONDS);
    assertThat(keySet).containsExactly(4, 5, 6, 7, 8, 9, 0, 3);


    // asMap.replace saves 4
    cache.asMap().replace(4, -4);
    ticker.advance(1, MILLISECONDS);
    assertThat(keySet).containsExactly(5, 6, 7, 8, 9, 0, 3, 4);


    // 5 expires
    ticker.advance(1, MILLISECONDS);
    assertThat(keySet).containsExactly(6, 7, 8, 9, 0, 3, 4);
  }

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com.google.common.cache.CacheExpirationTest

com.google.common.cache.CacheLoadingTest

com.google.common.cache.LocalCacheTest

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