private final ImmutableMap<C, ImmutableMap<R, V>> columnMap;

  // For each cell in iteration order, the index of that cell's row key in the row key list.
  @SuppressWarnings("Immutable") // We don't modify this after construction.
  private final int[] cellRowIndices;

  // For each cell in iteration order, the index of that cell's column key in the list of column
  // keys present in that row.

import org.codelibs.fess.crawler.rule.RuleManager;
import org.dbflute.utflute.core.PlainTestCase;

/**
 * Test class for CrawlerContext.
 * Tests all functionality including thread safety and concurrent operations.
 */
public class CrawlerContextTest extends PlainTestCase {

    private CrawlerContext crawlerContext;

    @Override
    protected void setUp() throws Exception {
        super.setUp();

```sh
# 1. Create a bucket and a user, and upload a file. These operations will succeed.
mc mb myminio/test
mc admin user add myminio foo foobar123
mc cp /etc/issue myminio/test/

# 2. Now access the server as user `foo`. These operations will also succeed.
export MC_HOST_foo=http://foo:foobar123@localhost:9000
mc ls foo/test
mc cat foo/test/issue

/**
 * Helper class for indexing operations in the Fess search engine.
 * This class provides functionality for sending documents to the search engine,
 * managing document lifecycle operations (create, update, delete), and handling
 * thumbnail processing during indexing.
 *
 * <p>The IndexingHelper manages bulk operations, handles retries on failures,
 * and provides various query-based operations for document management.

  public ValueGraphBuilder<N, V> expectedNodeCount(int expectedNodeCount) {
    this.expectedNodeCount = Optional.of(checkNonNegative(expectedNodeCount));
    return this;
  }

  /**
   * Specifies the order of iteration for the elements of {@link Graph#nodes()}.
   *
   * <p>The default value is {@link ElementOrder#insertion() insertion order}.
   */
  public <N1 extends N> ValueGraphBuilder<N1, V> nodeOrder(ElementOrder<N1> nodeOrder) {

But here's the key point.

The security and dependency injection stuff is written once.

And you can make it as complex as you want. And still, have it written only once, in a single place. With all the flexibility.

But you can have thousands of endpoints (*path operations*) using the same security system.

    /**
     * NT find operations are supported capability.
     */
    int CAP_NT_FIND = 0x0200;
    /**
     * DFS operations are supported capability.
     */
    int CAP_DFS = 0x1000;
    /**
     * Large read operations are supported capability.
     */
    int CAP_LARGE_READX = 0x4000;
    /**
     * Large write operations are supported capability.
     */

    /** Character encoding for command output. */
    protected String commandOutputEncoding = Charset.defaultCharset().displayName();

    /** Command array for user update operations. */
    protected String[] updateCommand;

    /** Command array for user deletion operations. */
    protected String[] deleteCommand;

    /** Array of target usernames for command execution. */
    protected String[] targetUsers;

    @Override

import org.dbflute.cbean.result.PagingResultBean;
import org.dbflute.optional.OptionalEntity;

import jakarta.annotation.Resource;

/**
 * Service class for managing user operations in the Fess search system.
 * This service provides CRUD operations for user management, including user authentication,
 * password management, and user listing with pagination support.
 *
 */
public class UserService {

import org.codelibs.fess.util.MemoryUtil;

import jakarta.annotation.PostConstruct;

/**
 * Implementation of IndexUpdateCallback for handling document indexing operations.
 * This class manages the process of updating the search index with documents from
 * data stores, including bulk operations, document transformation, and error handling.
 */
public class IndexUpdateCallbackImpl implements IndexUpdateCallback {