}
    }

    /**
     * Test EnumSet functionality
     */
    public void test_enumSet() {
        // Create EnumSet with all values
        EnumSet<CrawlerStatus> allStatuses = EnumSet.allOf(CrawlerStatus.class);
        assertEquals(3, allStatuses.size());
        assertTrue(allStatuses.contains(CrawlerStatus.INITIALIZING));
        assertTrue(allStatuses.contains(CrawlerStatus.RUNNING));

            unregisterFutures.add(unregister(registration));
        }

        // Wait for all unregistrations to complete
        try {
            CompletableFuture.allOf(unregisterFutures.toArray(new CompletableFuture[0])).get(10, TimeUnit.SECONDS);
        } catch (Exception e) {
            log.warn("Error during witness client shutdown", e);
        }

        // Shutdown scheduler

  @GwtIncompatible // complementOf
  public void testComplementOfEmptySet() {
    Set<SomeEnum> noUnits = emptySet();
    EnumSet<SomeEnum> allUnits = Sets.complementOf(noUnits, SomeEnum.class);
    verifySetContents(EnumSet.allOf(SomeEnum.class), allUnits);
  }

  @J2ktIncompatible
  @GwtIncompatible // complementOf
  public void testComplementOfFullSet() {
    Set<SomeEnum> allUnits = newHashSet(SomeEnum.values());

          parentBuilder) {
    Set<Feature<?>> features = computeMultimapAsMapGetFeatures(parentBuilder.getFeatures());
    if (Collections.disjoint(features, EnumSet.allOf(CollectionSize.class))) {
      return new TestSuite();
    } else {
      return CollectionTestSuiteBuilder.using(
              new MultimapAsMapGetGenerator<K, V, M>(parentBuilder.getSubjectGenerator()))

        } catch (ClassNotFoundException e) {
            return false;
        }
    }
    
    @Override
    public Set<RdmaCapability> getSupportedCapabilities() {
        return EnumSet.allOf(RdmaCapability.class);
    }
    
    @Override
    public RdmaConnection createConnection(InetSocketAddress remote, 
                                          InetSocketAddress local) throws IOException {

                    log.error("Failed to reconnect handle: " + handle.path, e);
                }
            }));
        }
        
        // Wait for all reconnections
        CompletableFuture.allOf(futures.toArray(new CompletableFuture[0])).join();
    }
}
```

## 11. Monitoring and Metrics

### 11.1 Handle Statistics
```java
public class HandleStatistics {

                throw new CompletionException(e);
            }
        });
        
        futures.add(future);
    }
    
    // Wait for all reads to complete
    try {
        CompletableFuture.allOf(futures.toArray(new CompletableFuture[0]))
            .get(30, TimeUnit.SECONDS);
    } catch (Exception e) {
        throw new IOException("Multi-channel read failed", e);
    }
}
```

## 6. Configuration

            unregisterFutures.add(unregister(registration));
        }
        
        // Wait for all unregistrations to complete
        try {
            CompletableFuture.allOf(unregisterFutures.toArray(new CompletableFuture[0]))
                .get(10, TimeUnit.SECONDS);
        } catch (Exception e) {
            log.warn("Error during witness client shutdown", e);
        }
        

  }

  @J2ktIncompatible
  @GwtIncompatible
  private static <E extends Enum<E>> EnumSet<E> makeComplementByHand(
      Collection<E> collection, Class<E> type) {
    EnumSet<E> result = EnumSet.allOf(type);
    result.removeAll(collection);
    return result;
  }

  /**
   * Returns a set backed by the specified map. The resulting set displays the same ordering,