* supported. The elements can be any objects.
 *
 * <p>{@code contains(x)}, {@code add(x)} and {@code remove(x)}, are all (expected and amortized)
 * constant time operations. Expected in the hashtable sense (depends on the hash function doing a
 * good job of distributing the elements to the buckets to a distribution not far from uniform), and
 * amortized since some operations can trigger a hash table resize.
 *

 * not consistent with {@code equals}.
 *
 * <p>The {@code standard} methods and the collection views they return are not guaranteed to be
 * thread-safe, even when all of the methods that they depend on are thread-safe.
 *
 * @author Kevin Bourrillion
 * @author Jared Levy
 * @author Louis Wasserman
 * @since 2.0
 */
@GwtCompatible

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied. See the License for the specific language
 * governing permissions and limitations under the License.
 */
package org.codelibs.fess;

// DO NOT DEPEND OTHER JARs

import java.io.File;
import java.util.List;
import java.util.Properties;

import org.apache.catalina.Container;
import org.apache.catalina.Context;
import org.apache.catalina.Host;

  // * We are more responsive to completion than timeouts. This is because parkNanos depends on
  //   system scheduling and as such we could either miss our deadline, or unpark() could be delayed
  //   so that it looks like we timed out even though we didn't. For comparison FutureTask respects
  //   completion preferably and AQS is non-deterministic (depends on where in the queue the waiter

複数のメッセージを送信（および受信）できます。

<img src="/img/tutorial/websockets/image04.png">

そして、これらの通信はすべて同じWebSocket接続を使用します。

## 依存関係

WebSocketエンドポイントでは、`fastapi` から以下をインポートして使用できます。

* `Depends`
* `Security`
* `Cookie`
* `Header`
* `Path`
* `Query`

これらは、他のFastAPI エンドポイント/*path operation* の場合と同じように機能します。

{* ../../docs_src/websockets/tutorial002.py hl[58:65,68:83] *}

/// info | 情報

### `OAuth2PasswordRequestForm` { #oauth2passwordrequestform }

Сначала импортируйте `OAuth2PasswordRequestForm` и затем используйте её как зависимость с `Depends` в операции пути для `/token`:

{* ../../docs_src/security/tutorial003_an_py310.py hl[4,78] *}

`OAuth2PasswordRequestForm` — это зависимость-класс, которая объявляет тело формы со следующими полями:

* `username`.

   *
   * <p>This executor is appropriate for tasks that are lightweight and not deeply chained.
   * Inappropriate {@code directExecutor} usage can cause problems, and these problems can be
   * difficult to reproduce because they depend on timing. For example:
   *
   * <ul>
   *   <li>When a {@code ListenableFuture} listener is registered to run under {@code
   *       directExecutor}, the listener can execute in any of three possible threads:

 * remove) are supported. Null keys and values are supported.
 *
 * <p>{@code containsKey(k)}, {@code put(k, v)} and {@code remove(k)} are all (expected and
 * amortized) constant time operations. Expected in the hashtable sense (depends on the hash
 * function doing a good job of distributing the elements to the buckets to a distribution not far
 * from uniform), and amortized since some operations can trigger a hash table resize.
 *

                    .get());
            options.addOption(Option.builder(ALSO_MAKE_DEPENDENTS)
                    .longOpt("also-make-dependents")
                    .desc("If project list is specified, also build projects that depend on projects on the list")
                    .get());
            options.addOption(Option.builder(THREADS)
                    .longOpt("threads")
                    .hasArg()

    <exportedArtifact>org.eclipse.sisu:org.eclipse.sisu.plexus</exportedArtifact>
    <exportedArtifact>org.apache.maven:maven-artifact</exportedArtifact>
    <!--
      | MNG-6240: Plugins might depend on maven-aether-provider <= 3.3.9 before the rename to maven-resolver-provider.
      | Since backwards-compatibility was kept, Maven Core also provides this artifact.
     -->