- **Network & I/O** (`org.codelibs.core.net`, `org.codelibs.core.nio`) - URL utilities, UUID generation, MIME type detection, and NIO channel operations

## 🚀 Getting Started

### Requirements
- **Java 21 or higher** (Required for modern language features)
- **Maven 3.6+** or **Gradle 7+** for build management
- **Optional**: SLF4J or Commons Logging for logging support

                        .filter(QueryBuilders.termsQuery(OpenSearchAccessResult.SESSION_ID, sessionIdList))
                        .filter(QueryBuilders.termQuery(OpenSearchAccessResult.STATUS, org.codelibs.fess.crawler.Constants.OK_STATUS));
                builder.setQuery(queryBuilder);
                builder.setFrom(0);

                        success[index] = false;
                    }
                });
            }

            // When
            for (Thread thread : threads) {
                thread.start();
            }
            for (Thread thread : threads) {
                thread.join();
            }

            // Then
            for (int i = 0; i < threadCount; i++) {

        private static FileEntry staticInitial;
        private static List<FileEntry[]> staticPages;
        private static boolean staticThrowOnOpen;

        private int pageIdx = -1; // Start before first page
        private boolean done = false;
        private boolean throwOnFetch;
        private boolean throwOnCloseInternal;

        // Use static factory method to work around constructor ordering

        var value = value
        // Write the raw value for a single byte value.
        if (value < prefixMask) {
          out.writeByte(bits or value)
          return
        }

        // Write the mask to start a multibyte value.
        out.writeByte(bits or prefixMask)
        value -= prefixMask

        // Write 7 bits at a time 'til we're done.
        while (value >= 0x80) {
          val b = value and 0x7f

 * and provides methods for logging messages using {@link LogHelper}.
 * </p>
 *
 * <p>
 * The crawling process continues until the crawler status is {@link CrawlerStatus#DONE} or the
 * {@link #isContinue(int)} method returns {@code false}.
 * </p>
 *
 */
public class CrawlerThread implements Runnable {
    /**
     * Constructs a new CrawlerThread.
     */

            }
        });

    }

    /**
     * Begins statistics tracking for the specified crawler object.
     * Creates a new statistics object in the cache and starts timing.
     *
     * @param keyObj the crawler object to track (UrlQueue, StatsKeyObject, String, or Number)
     */
    public void begin(final Object keyObj) {
        getCacheKey(keyObj).ifPresent(key -> {

            // Test odd Unicode alignment - headerStart affects alignment
            int bytesWritten = testBlock.writeString(testString, buffer, 2);

            // When even alignment (offset 2), Unicode string starts immediately
            assertTrue(bytesWritten >= 8); // "Test" in Unicode + null terminator
            // First byte should be 'T' in UTF-16LE
            assertEquals(0x54, buffer[2] & 0xFF);
        }

        try {
          map.get(one, loader);
        } catch (ExecutionException e) {
          throw new RuntimeException(e);
        }
        doneSignal.countDown();
      }
    }.start();

    try {
      computingSignal.await();
    } catch (InterruptedException e) {
      throw new RuntimeException(e);
    }

    new Thread() {
      @Override
      public void run() {

        try {
          map.get(one, loader);
        } catch (ExecutionException e) {
          throw new RuntimeException(e);
        }
        doneSignal.countDown();
      }
    }.start();

    try {
      computingSignal.await();
    } catch (InterruptedException e) {
      throw new RuntimeException(e);
    }

    new Thread() {
      @Override
      public void run() {