} else if (logger.isInfoEnabled()) {
                logger.info("ThumbnailGenerator is stopped.");
            }
            exitCode = Constants.EXIT_FAIL;
        } catch (final Throwable t) {
            logger.error("ThumbnailGenerator terminated unexpectedly.", t);
            exitCode = Constants.EXIT_FAIL;
        } finally {
            if (systemMonitorTask != null) {

                    + exceptionList.stream().map(e -> "; " + e.getMessage()).collect(Collectors.joining());
            throw new MultipleCrawlingAccessException(message, exceptionList.toArray(new Throwable[exceptionList.size()]));
        } finally {
            if (listener != null) {
                listener.onRequestEnd(this, request, exceptionList);
            }
        }
    }

    /**

        /**
         * Create exception with cause
         *
         * @param message error message
         * @param cause underlying cause
         */
        public NoAvailableChannelException(String message, Throwable cause) {
            super(message, cause);
        }
    }

   */
  public <X extends Throwable> ClosingFuture<V> catching(
      Class<X> exceptionType, ClosingFunction<? super X, ? extends V> fallback, Executor executor) {
    return catchingMoreGeneric(exceptionType, fallback, executor);
  }

  // Avoids generic type capture inconsistency problems where |? extends V| is incompatible with V.
  private <X extends Throwable, W extends V> ClosingFuture<V> catchingMoreGeneric(

                        }
                    } catch (final CrawlingAccessException e) {
                        log(logHelper, LogType.CRAWLING_ACCESS_EXCEPTION, crawlerContext, urlQueue, e);
                    } catch (final Throwable e) {
                        log(logHelper, LogType.CRAWLING_EXCEPTION, crawlerContext, urlQueue, e);
                    } finally {
                        try {

                 * to return a proper ListenableFuture instead of using listenInPoolThread.
                 */
                getUninterruptibly(delegate);
              } catch (Throwable t) {
                // (including CancellationException and sneaky checked exception)
                // The task is presumably done, run the listeners.

     * @param severity the error severity
     * @param category the error category
     * @param cause the cause exception
     */
    public SmbException(String message, int errorCode, Severity severity, Category category, Throwable cause) {
        super(message, cause);
        this.errorCode = errorCode;
        this.severity = severity;
        this.category = category;
        this.context = new HashMap<>();

        }
      };

  private static final UncaughtExceptionHandler UNCAUGHT_EXCEPTION_HANDLER =
      new UncaughtExceptionHandler() {
        @Override
        public void uncaughtException(Thread t, Throwable e) {
          // No-op
        }
      };

  private ThreadFactoryBuilder builder;
  private volatile boolean completed = false;

  @Override
  public void setUp() {

      V value, @Nullable Exception except, CountDownLatch waitOn);

  /** Tests that the {@link Future#get()} method blocks until a value is available. */
  public void testGetBlocksUntilValueAvailable() throws Throwable {

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

    ExecutorService executor = newSingleThreadExecutor();

    try {

```

**Async Operations:**
```java
suggester.suggest()
    .setQuery("search")
    .execute()
    .done(response -> { /* handle success */ })
    .error(throwable -> { /* handle error */ });
```

---

## Important Notes

### Thread Safety
- **Suggester**: Thread-safe for queries
- **SuggestIndexer**: Thread-safe for indexing