}

  public void testManualServiceFailureIdempotence() {
    ManualSwitchedService service = new ManualSwitchedService();
    /*
     * Set up a RecordingListener to perform its built-in assertions, even though we won't look at
     * its state history.
     */
    RecordingListener unused = RecordingListener.record(service);
    service.startAsync();
    service.notifyFailed(new Exception("1"));

   * ClassLoader that loaded that class from later being garbage-collected. If anything continues
   * to reference the FinalizableReferenceQueue class then its ClassLoader cannot be
   * garbage-collected, even if there are no more instances of FinalizableReferenceQueue itself.
   * The code in FinalizableReferenceQueue goes to considerable trouble to ensure that there are

  }

  /**
   * Returns an unmodifiable view of the difference of two multisets. In the returned multiset, the
   * count of each element is the result of the <i>zero-truncated subtraction</i> of its count in
   * the second multiset from its count in the first multiset, with elements that would have a count
   * of 0 not included. The iteration order of the returned multiset matches that of the element set

// targets (not all since targets which have outputs in the tape will not have
// gradients available initially).
//
// Then we repeatedly pop an entry from the stack, run its backprop, and update
// the gradients of its inputs. Once we have computed all gradients for a single
// input we can mark this input as done, and this can trigger adding an entry to
// the stack if all outputs of that entry are now done.
//

## Peewee for async

Peewee was not designed for async frameworks, or with them in mind.

Peewee has some heavy assumptions about its defaults and about how it should be used.

If you are developing an application with an older non-async framework, and can work with all its defaults, **it can be a great tool**.

   */
  public static <T extends @Nullable Object> Predicate<T> not(Predicate<T> predicate) {
    return new NotPredicate<>(predicate);
  }

  /**
   * Returns a predicate that evaluates to {@code true} if each of its components evaluates to
   * {@code true}. The components are evaluated in order, and evaluation will be "short-circuited"
   * as soon as a false predicate is found. It defensively copies the iterable passed in, so future

      the copyright owner. For the purposes of this definition, "submitted"
      means any form of electronic, verbal, or written communication sent
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      communication on electronic mailing lists, source code control systems,
      and issue tracking systems that are managed by, or on behalf of, the

      the copyright owner. For the purposes of this definition, "submitted"
      means any form of electronic, verbal, or written communication sent
      to the Licensor or its representatives, including but not limited to
      communication on electronic mailing lists, source code control systems,
      and issue tracking systems that are managed by, or on behalf of, the

      the copyright owner. For the purposes of this definition, "submitted"
      means any form of electronic, verbal, or written communication sent
      to the Licensor or its representatives, including but not limited to
      communication on electronic mailing lists, source code control systems,
      and issue tracking systems that are managed by, or on behalf of, the

      the copyright owner. For the purposes of this definition, "submitted"
      means any form of electronic, verbal, or written communication sent
      to the Licensor or its representatives, including but not limited to
      communication on electronic mailing lists, source code control systems,
      and issue tracking systems that are managed by, or on behalf of, the