}

        if (ResourceUtil.getResourceNoException("org/h2/Driver.class") != null) {
            list.add("h2");
        }

        if (ResourceUtil.getResourceNoException("com/mysql/jdbc/Driver.class") != null) {
            list.add("mysql");
        }

        if (ResourceUtil.getResourceNoException("oracle/jdbc/driver/OracleDriver.class") != null) {
            list.add("oracle");
        }

Here’s a [sample event listener](https://github.com/square/okhttp/blob/master/samples/guide/src/main/java/okhttp3/recipes/PrintEventsNonConcurrent.java) that prints each event with a timestamp.

```java
class PrintingEventListener extends EventListener {
  private long callStartNanos;

  private void printEvent(String name) {
    long nowNanos = System.nanoTime();
    if (name.equals("callStart")) {

@SuppressWarnings("JUnit4ClassUsedInJUnit3")
public class CollectionRetainAllTester<E> extends AbstractCollectionTester<E> {

  /** A collection of elements to retain, along with a description for use in failure messages. */
  private class Target {
    private final Collection<E> toRetain;
    private final String description;

/// check

, ⏮️ 🎏 🐍 🆎 📄, **FastAPI** 🤝 👆 💽 🔬.

👀 👈 ❌ 🎯 🇵🇸 ⚫️❔ ☝ 🌐❔ 🔬 🚫 🚶‍♀️.

👉 🙃 👍 ⏪ 🛠️ & 🛠️ 📟 👈 🔗 ⏮️ 👆 🛠️.

///

## 🧾

  @WeakOuter
  private final class IsStartableGuard extends Guard {
    IsStartableGuard() {
      super(AbstractService.this.monitor);
    }

    @Override
    public boolean isSatisfied() {
      return state() == NEW;
    }
  }

  private final Guard isStoppable = new IsStoppableGuard();

  @WeakOuter
  private final class IsStoppableGuard extends Guard {
    IsStoppableGuard() {

 * @author Jesse Wilson
 * @author Jared Levy
 * @author Hayward Chan
 * @author Chris Povirk
 * @author Louis Wasserman
 */
@GwtCompatible
@ElementTypesAreNonnullByDefault
public class SortedMapGenerators {
  public static class ImmutableSortedMapGenerator extends TestStringSortedMapGenerator {
    @Override
    public SortedMap<String, String> create(Entry<String, String>[] entries) {

        val directory = projectDir.resolve("classes")

        touchFile(directory.resolve("com/acme/Foo.class"))
        touchFile(directory.resolve("com/acme/internal/FooInternal.class"))
        touchFile(directory.resolve("com/foo/internal/FooInternal.class"))
        touchFile(directory.resolve("javax/servlet/http/HttpServletRequest.class"))

        return sequenceOf(directory)
    }

    private

labels.search=Search
labels.similar_doc_result_status=Similar results are displayed.
labels.search_result_status=Results <b>{2}</b><span class="hidden-phone"> -</span> <b>{3}</b> of <b>{1}</b> for <b>{0}</b>
labels.search_result_status_over=Results <b>{2}</b><span class="hidden-phone"> -</span> <b>{3}</b> of about <b>{1}</b> for <b>{0}</b>
labels.search_result_time=({0} sec)
labels.prev_page=Prev
labels.next_page=Next

```Python hl_lines="1"
{!../../docs_src/first_steps/tutorial001.py!}
```

`FastAPI` là một Python class cung cấp tất cả chức năng cho API của bạn.

/// note | "Chi tiết kĩ thuật"

`FastAPI` là một class kế thừa trực tiếp `Starlette`.

Bạn cũng có thể sử dụng tất cả <a href="https://www.starlette.io/" class="external-link" target="_blank">Starlette</a> chức năng với `FastAPI`.

///

from fastapi import FastAPI
from fastapi.testclient import TestClient
from pydantic import BaseModel

app = FastAPI()


class Model(BaseModel):
    pass


class Model2(BaseModel):
    a: Model


class Model3(BaseModel):
    c: Model
    d: Model2


@app.get("/", response_model=Model3)
def f():
    return {"c": {}, "d": {"a": {}}}


client = TestClient(app)


def test_get_api_route():