doParallelCacheOp(count, n -> cache.asMap().computeIfAbsent(key, k -> "value" + n));
    assertThat(cache.size()).isEqualTo(1);
  }

  public void testComputeIfAbsentEviction() {
    // b/80241237

    Cache<String, String> c = CacheBuilder.newBuilder().maximumSize(1).build();

    assertThat(c.asMap().computeIfAbsent("hash-1", k -> "")).isEqualTo("");
    assertThat(c.asMap().computeIfAbsent("hash-1", k -> "")).isEqualTo("");

   * [computeIfAbsent] implementation. No locks are held while calling this function.
   */
  fun <T : Any> tag(
    type: KClass<T>,
    computeIfAbsent: () -> T,
  ): T

  /**
   * Returns the tag attached with [type] as a key. If it is absent, then [computeIfAbsent] is
   * called and that value is both inserted and returned.
   *

  override fun <T> tag(type: Class<out T>): T? = error("unexpected")

  override fun <T : Any> tag(
    type: KClass<T>,
    computeIfAbsent: () -> T,
  ): T = error("unexpected")

  override fun <T : Any> tag(
    type: Class<T>,
    computeIfAbsent: () -> T,
  ): T = error("unexpected")

  override fun clone(): Call = error("unexpected")

  override fun <T : Any> tag(
    type: KClass<T>,
    computeIfAbsent: () -> T,
  ): T = tags.computeIfAbsent(type, computeIfAbsent)

  override fun <T : Any> tag(
    type: Class<T>,
    computeIfAbsent: () -> T,
  ): T = tags.computeIfAbsent(type.kotlin, computeIfAbsent)

  @SuppressWarnings("CloneDoesntCallSuperClone") // We are a final type & this saves clearing state.

      .toList()
      .reversed()
      .joinToString(prefix = "{", postfix = "}") { "${it.key}=${it.value}" }
}

internal fun <T : Any> AtomicReference<Tags>.computeIfAbsent(
  type: KClass<T>,
  compute: () -> T,
): T {
  var computed: T? = null

  while (true) {
    val tags = get()

    // If the element is already present. Return it.

            if (allProjects != null) {
                Map<String, Map<String, Map<String, MavenProject>>> map = new HashMap<>();
                allProjects.forEach(project -> map.computeIfAbsent(project.getGroupId(), k -> new HashMap<>())
                        .computeIfAbsent(project.getArtifactId(), k -> new HashMap<>())
                        .put(project.getVersion(), project));
                this.allProjects = map;
            } else {

        override fun <T> tag(type: Class<out T>): T? = TODO()

        override fun <T : Any> tag(
          type: KClass<T>,
          computeIfAbsent: () -> T,
        ): T = TODO()

        override fun <T : Any> tag(
          type: Class<T>,
          computeIfAbsent: () -> T,
        ): T = TODO()

        override fun clone(): Call = TODO()
      }
  }

  @Test
  fun callback() {

        if (setterInfo == null) {
            // Look for any method named "set" with one parameter
            Map<String, MethodInfo> classMethodCache = METHOD_CACHE.computeIfAbsent(beanType, this::buildMethodCache);
            setterInfo = classMethodCache.get("set");
        }

        if (setterInfo == null) {

   *
   * @throws UnsupportedOperationException always
   * @deprecated Unsupported operation.
   */
  @Deprecated
  @Override
  @DoNotCall("Always throws UnsupportedOperationException")
  public final V computeIfAbsent(K key, Function<? super K, ? extends V> mappingFunction) {
    throw new UnsupportedOperationException();
  }

  /**
   * Guaranteed to throw an exception and leave the map unmodified.
   *

    val reportOnly: Provider<Boolean>
)

private class ConcurrentMultiMap<K, V> {
    private val map = ConcurrentHashMap<K, MutableSet<V>>()

    fun add(key: K, value: V) =
        map.computeIfAbsent(key, { _ -> ConcurrentHashMap.newKeySet() }).add(value)

    fun getOrEmpty(key: K): Set<V> = map[key] ?: emptySet()
}

abstract class TestFilesCleanupService @Inject constructor(