}

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

            // Then
            for (int i = 0; i < threadCount; i++) {
                assertTrue(success[i], "Thread " + i + " failed");
            }
        }

        @Test

            reload(updater);
        }
    }

    /**
     * Reloads the stemmer override dictionary from its source file.
     *
     * @param updater An optional updater to apply changes during reload.
     * @throws DictionaryException if the dictionary file cannot be read.
     */
    protected void reload(final StemmerOverrideUpdater updater) {

          /* Someone beat us to it! Trying again...
           *
           * Technically this loop not guaranteed to terminate, so theoretically (extremely
           * unlikely) this thread might starve, but even then, there is always going to be another
           * thread doing progress here.
           */
        }
      }
    }
  }

  /**

import jakarta.annotation.Resource;

/**
 * The {@code CrawlerThread} class represents a thread that executes the crawling process.
 * It is responsible for fetching URLs from the queue, accessing the content,
 * processing the response, and extracting child URLs.
 *
 * <p>
 * This class implements the {@link Runnable} interface, allowing it to be executed in a separate thread.

     */
    public void setTimeout(final long timeout) {
        this.timeout = timeout;
    }

    /**
     * Sets whether the extraction thread should be a daemon thread.
     * @param isDaemonThread true to make it a daemon thread, false otherwise.
     */
    public void setDaemonThread(final boolean isDaemonThread) {
        this.isDaemonThread = isDaemonThread;
    }

    assertFalse(future.isDone());
    assertFalse(future.isCancelled());

    CountDownLatch successLatch = new CountDownLatch(1);

    // Run cancellation in a separate thread as an extra thread-safety test.
    new Thread(
            () -> {
              assertThrows(CancellationException.class, future::get);
              successLatch.countDown();
            })
        .start();

    service.setPort(9200);
});
```

## Performance Tuning

### Thread Configuration

```java
// Optimize thread pool settings
crawler.crawlerContext.setNumOfThread(20);           // Number of crawler threads
crawler.crawlerContext.setMaxThreadCheckCount(50);   // Thread monitoring frequency
```

### Connection Pool Tuning

```java

            mojos.put(Thread.currentThread(), mojoDescriptor);
            boolean aggregator = mojoDescriptor.isAggregator();
            acquiredAggregatorLock = aggregator ? aggregatorLock.writeLock() : aggregatorLock.readLock();
            acquiredProjectLock = getProjectLock(session);
            if (!acquiredAggregatorLock.tryLock()) {
                Thread owner = aggregatorLock.getOwner();

      }

    /**
     * Sets the default read timeout for new connections. A value of 0 means no timeout, otherwise
     * values must be between 1 and [Integer.MAX_VALUE] when converted to milliseconds.
     *
     * The read timeout is applied to both the TCP socket and for individual read IO operations
     * including on [Source] of the [Response]. The default value is 10 seconds.
     *

    @Test
    public void testThreadSafety() throws InterruptedException {
        // Test concurrent updates from multiple threads
        Thread[] threads = new Thread[10];

        for (int i = 0; i < threads.length; i++) {
            final int index = i;
            threads[i] = new Thread(() -> {
                for (int j = 0; j < 100; j++) {
                    String name = "file" + index + "_" + j + ".txt";