* thanks to @GuardedBy above. (cancellationDelegate.lock is initialized to this.lock in the
       * call to `new SupplantableFuture` below.)
       */
      @SuppressWarnings("GuardedBy")
      private Cancellable initializeOrUpdateCancellationDelegate(Schedule schedule) {
        if (cancellationDelegate == null) {

Create a file `main.py` with:

```Python
from typing import Union

from fastapi import FastAPI

app = FastAPI()


@app.get("/")
def read_root():
    return {"Hello": "World"}


@app.get("/items/{item_id}")
def read_item(item_id: int, q: Union[str, None] = None):
    return {"item_id": item_id, "q": q}
```

<details markdown="1">

   * given directory or even be infinite if there is a symbolic link loop.
   *
   * <p>If available, consider using {@link MoreFiles#fileTraverser()} instead. It behaves the same
   * except that it doesn't follow symbolic links and returns {@code Path} instances.
   *
   * <p>If the {@link File} passed to one of the {@link Traverser} methods does not exist or is not

   * given directory or even be infinite if there is a symbolic link loop.
   *
   * <p>If available, consider using {@link MoreFiles#fileTraverser()} instead. It behaves the same
   * except that it doesn't follow symbolic links and returns {@code Path} instances.
   *
   * <p>If the {@link File} passed to one of the {@link Traverser} methods does not exist or is not

		// for i, c := range via {
		// 	fmt.Printf("Sofar %d: %s %s\n", i, c.Method, c.URL.String())
		// }
		// Save the last request in a redirect chain.
		lastReq = req
		// We do not follow redirect back to client application.
		if req.URL.Path == "/oauth_callback" {
			return http.ErrUseLastResponse
		}
		return nil
	}

	dexClient := http.Client{
		CheckRedirect: checkRedirect,

		t.Skip("skip sqlite, sqlserver due to it doesn't support multiple primary keys with auto increment")
	}

	if name := DB.Dialector.Name(); name == "mysql" {
		t.Skip("skip mysql due to it only allow unique constraint matching given keys")
	}

	type (
		Level1 struct {
			ID           uint   `gorm:"primary_key;"`
			LanguageCode string `gorm:"primary_key"`
			Value        string
		}

```

A contra-parte da aplicação FastAPI, *rota de operação*, poderia parecer como:

```Python hl_lines="1"
@app.get("/some/url")
def read_url():
    return {"message": "Hello World"}
```

Veja as similaridades em `requests.get(...)` e `@app.get(...)`.

/// check | **FastAPI** inspirado para

* Ter uma API simples e intuitiva.

```Python
response = requests.get("http://example.com/some/url")
```

La operación de path equivalente en FastAPI podría verse como:

```Python hl_lines="1"
@app.get("/some/url")
def read_url():
    return {"message": "Hello World"}
```

Mira las similitudes entre `requests.get(...)` y `@app.get(...)`.

/// check | Inspiró a **FastAPI** a

* Tener un API simple e intuitivo.

   * that entries are indexable using ints.
   */
  static final int MAXIMUM_CAPACITY = Ints.MAX_POWER_OF_TWO;

  /** The maximum number of segments to allow; used to bound constructor arguments. */
  static final int MAX_SEGMENTS = 1 << 16; // slightly conservative

  /** Number of (unsynchronized) retries in the containsValue method. */

    TypeToken<List<String>> a = new TypeToken<List<String>>() {};
    TypeToken<List<String>> b = new TypeToken<List<String>>() {};
    assertEquals(a, b);
  }

  @SuppressWarnings("TestExceptionChecker") // see comment below
  public <T> void testVariableTypeTokenNotAllowed() {
    /*
     * We'd use assertThrows here, but that causes no exception to be thrown under Java 8,