assertFalse("Capable of acquiring an additional permit", r.tryAcquire());
    stopwatch.sleepMillis(Integer.MAX_VALUE);
    assertFalse("Capable of acquiring an additional permit after sleeping", r.tryAcquire());
  }

  public void testSimpleRateUpdate() {
    RateLimiter limiter = RateLimiter.create(5.0, 5, SECONDS);
    assertThat(limiter.getRate()).isEqualTo(5.0);
    limiter.setRate(10.0);

    assertFalse("Capable of acquiring an additional permit", r.tryAcquire());
    stopwatch.sleepMillis(Integer.MAX_VALUE);
    assertFalse("Capable of acquiring an additional permit after sleeping", r.tryAcquire());
  }

  public void testSimpleRateUpdate() {
    RateLimiter limiter = RateLimiter.create(5.0, 5, SECONDS);
    assertThat(limiter.getRate()).isEqualTo(5.0);
    limiter.setRate(10.0);

   * granted. Tells the amount of time slept, if any.
   *
   * <p>This method is equivalent to {@code acquire(1)}.
   *
   * @return time spent sleeping to enforce rate, in seconds; 0.0 if not rate-limited
   * @since 16.0 (present in 13.0 with {@code void} return type})
   */
  @CanIgnoreReturnValue
  public double acquire() {
    return acquire(1);
  }

   * granted. Tells the amount of time slept, if any.
   *
   * <p>This method is equivalent to {@code acquire(1)}.
   *
   * @return time spent sleeping to enforce rate, in seconds; 0.0 if not rate-limited
   * @since 16.0 (present in 13.0 with {@code void} return type})
   */
  @CanIgnoreReturnValue
  public double acquire() {
    return acquire(1);
  }

</pre>
```

</div>

It is **HIGHLY encouraged** that you write or copy the code, edit it and run it locally.

Using it in your editor is what really shows you the benefits of FastAPI, seeing how little code you have to write, all the type checks, autocompletion, etc.

---

## Install FastAPI

The first step is to install FastAPI.

import org.slf4j.LoggerFactory;

import static java.util.Objects.requireNonNull;

/**
 * A {@link TransferListener} implementation that wraps another delegate {@link TransferListener} but makes it run
 * on single thread, keeping the listener logic simple. This listener also blocks on last transfer event to allow
 * output to perform possible cleanup. It spawns a daemon thread to consume queued events that may fall in even
 * concurrently.
 *

Goals:
- Improve upgrade experience: users should be able to gradually roll upgrades, with proper
canary deployments for Istio components. It should be possible to deploy a new version while keeping the
stable version in place and gradually migrate apps to the new version.

- More flexibility: the new installer allows multiple 'environments', allowing applications to select

     */
    private final Map<String, List<Method>> methodByNameMap = new Hashtable<>();

    /**
     * Add a method to a list of methods by name.
     * For a particular class we are keeping track
     * of all the methods with the same name.
     *
     * @param method The method
     */
    void add(Method method) {
        String methodName = method.getName();

And the `dict` you receive as `weights` will actually have `int` keys and `float` values.

///

## Recap

With **FastAPI** you have the maximum flexibility provided by Pydantic models, while keeping your code simple, short and elegant.

But with all the benefits:

* Editor support (completion everywhere!)
* Data conversion (a.k.a. parsing / serialization)
* Data validation
* Schema documentation

    //                                                                           Attribute
    //                                                                           =========
    // keeping parsed request parameters, normal texts or uploaded files
    // keys are requested parameter names (treated as field name here)
    protected Map<String, Object> elementsAll; // lazy-loaded, then after not null