* crawling and indexing documents, including incremental crawling capabilities, content
 * modification checking, and integration with the Fess search engine backend.
 *
 * <p>Key features include:</p>
 * <ul>
 * <li>Incremental crawling support with last-modified timestamp checking</li>
 * <li>Document expiration handling</li>
 * <li>Child URL extraction and queueing</li>

The same way as with Pydantic models, you declare class attributes with type annotations, and possibly default values.

You can use all the same validation features and tools you use for Pydantic models, like different data types and additional validations with `Field()`.

//// tab | Pydantic v2

{* ../../docs_src/settings/tutorial001.py hl[2,5:8,11] *}

////

* 당신의 언어로 [문서 번역하는데](contributing.md#translations){.internal-link target=\_blank} 기여할 때.
    * 다른 사람이 작성한 번역을 검토하는 것도 도울 수 있습니다.
* 새로운 문서의 섹션을 제안할 때.
* 기존 문제/버그를 수정할 때.
    * 테스트를 반드시 추가해야 합니다.
* 새로운 feature를 추가할 때.
    * 테스트를 반드시 추가해야 합니다.
    * 관련 문서가 필요하다면 반드시 추가해야 합니다.

## FastAPI 유지 관리에 도움 주기

**FastAPI**의 유지 관리를 도와주세요! 🤓

할 일이 많고, 그 중 대부분은 **여러분**이 할 수 있습니다.

지금 할 수 있는 주요 작업은:

import com.google.common.collect.testing.ListTestSuiteBuilder;
import com.google.common.collect.testing.NavigableSetTestSuiteBuilder;
import com.google.common.collect.testing.features.CollectionFeature;
import com.google.common.collect.testing.features.CollectionSize;
import com.google.common.collect.testing.google.SetGenerators.ImmutableSortedSetAsListGenerator;

/**
 * Admin action for Synonym management.
 *
 */
public class AdminDictSynonymAction extends FessAdminAction {

    /**
     * Role name required for accessing synonym dictionary administration features.
     */
    public static final String ROLE = "admin-dict";

    private static final Logger logger = LogManager.getLogger(AdminDictSynonymAction.class);

    }
  }

  /**
   * {@link AtomicHelper} based on {@code synchronized} and volatile writes.
   *
   * <p>This is an implementation of last resort for when certain basic VM features are broken (like
   * AtomicReferenceFieldUpdater).
   */
  private static final class SynchronizedHelper extends AtomicHelper {
    @Override
    void putThread(Waiter waiter, Thread newValue) {

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Secure key management for SMB encryption.
 * Provides centralized management of encryption keys with secure storage and cleanup.
 *
 * Features:
 * - Secure key storage with optional KeyStore integration
 * - Automatic key cleanup on close
 * - Thread-safe key management
 * - Key derivation utilities
 * - Memory wiping capabilities
 */

    }
  }

  /**
   * {@link AtomicHelper} based on {@code synchronized} and volatile writes.
   *
   * <p>This is an implementation of last resort for when certain basic VM features are broken (like
   * AtomicReferenceFieldUpdater).
   */
  private static final class SynchronizedHelper extends AtomicHelper {
    @Override
    void putThread(Waiter waiter, Thread newValue) {

import org.slf4j.LoggerFactory;
import org.slf4j.MDC;

/**
 * Security audit logger for SMB operations.
 * Provides structured logging of security-relevant events with sensitive data masking.
 *
 * Features:
 * - Structured JSON logging
 * - Sensitive data masking
 * - Event categorization
 * - Performance metrics
 * - Compliance-ready audit trail
 * - Asynchronous logging with bounded queue

such as MinIO. MapReduce workloads typically interact with object stores in the same way they do with HDFS. These workloads rely on HDFS atomic rename functionality to complete writing data to the datastore. Object storage operations are atomic by nature and they do not require/implement rename API. The default S3A committer emulates renames through copy and delete APIs. This interaction pattern causes significant loss of performance because of the write amplification. _Netflix_, for example, developed...