private var lastTimestampNs: Long? = null

  /** Confirm that the thread does not hold a lock on `lock` during the callback. */
  fun forbidLock(lock: Any) {
    forbiddenLocks.add(lock)
  }

  /**
   * Removes recorded events up to (and including) an event is found whose class equals [eventClass]
   * and returns it.
   */
  fun <T : CallEvent> removeUpToEvent(eventClass: Class<T>): T {

                file.update(charMappingItem);
            }
        });
    }

    /**
     * Deletes a character mapping item from the specified dictionary.
     * <p>
     * This method removes the specified character mapping item from the dictionary
     * if the dictionary file exists and is accessible.
     * </p>
     *
     * @param dictId the dictionary ID to delete the character mapping item from

        }
    }

    /**
     * Removes a scheduled job completely from the job manager.
     *
     * @param scheduledJob the scheduled job to remove
     * @throws ScheduledJobException if the job cannot be removed
     */
    public void remove(final ScheduledJob scheduledJob) {
        try {

            }).orElse(() -> {
                throw new FessUserNotFoundException(username);
            });
        }

    }

    /**
     * Deletes a user from the system.
     * Removes the user from both the authentication manager and the database.
     *
     * @param user the user entity to delete
     */
    public void delete(final User user) {

        return ComponentUtil.getPluginHelper().getArtifact(values[0], values[1]);
    }

    /**
     * Installs the specified artifact in a background thread.
     * Also removes any previously installed versions of the same plugin.
     *
     * @param artifact the artifact to install
     */
    public static void installArtifact(final Artifact artifact) {
        new Thread(() -> {

        }).createPageNumberList());

        return dataConfigList;
    }

    /**
     * Deletes the specified data configuration from the system.
     *
     * <p>This operation permanently removes the data configuration and
     * immediately refreshes the index to ensure the change is visible.</p>
     *
     * @param dataConfig the data configuration to delete

        } finally {
          unlock();
        }
      }
    }

    /**
     * Removes an entry from within a table. All entries following the removed node can stay, but
     * all preceding ones need to be cloned.
     *
     * <p>This method does not decrement count for the removed entry, but does decrement count for

          current = null;
        } else {
          current = current.succ();
        }
        return result;
      }

      @Override
      public void remove() {
        checkState(prevEntry != null, "no calls to next() since the last call to remove()");
        setCount(prevEntry.getElement(), 0);
        prevEntry = null;
      }
    };
  }

  @Override
  Iterator<Entry<E>> descendingEntryIterator() {

      while (openClientSocket.hasNext()) {
        openClientSocket.next().closeQuietly()
        openClientSocket.remove()
      }

      val httpConnection = openConnections.iterator()
      while (httpConnection.hasNext()) {
        httpConnection.next().closeQuietly()
        httpConnection.remove()
      }
      dispatcher.close()
    }
  }

  @Throws(Exception::class)

        crawlingInfoHelper.putToInfoMap(Constants.DATA_INDEX_SIZE, Long.toString(indexUpdateCallback.getDocumentSize()));

        for (final String sid : sessionIdList) {
            // remove config
            ComponentUtil.getCrawlingConfigHelper().remove(sid);
        }

    }

    /**
     * Inner thread class for executing data store crawling operations.
     * Each thread handles crawling for a single data configuration,