* take a principled stand on this, but the amount of such code is simply overwhelming. To avoid
   * creating a lot of compile errors that users would not find to be informative, we're giving in
   * and allowing callers to pass arguments that a nullness checker believes could be null.
   *
   * We still encourage people to use requireNonNull over checkNotNull for non-precondition checks.
   */

  /**

   *
   * @param listener the listener to run when the service changes state is complete
   * @param executor the executor in which the listeners callback methods will be run. For fast,
   *     lightweight listeners that would be safe to execute in any thread, consider {@link
   *     MoreExecutors#directExecutor}.
   * @since 13.0
   */
  void addListener(Listener listener, Executor executor);

  /**

  /**
   * Returns a big-endian representation of {@code value} in an 8-element byte array; equivalent to
   * {@code ByteBuffer.allocate(8).putLong(value).array()}. For example, the input value {@code
   * 0x1213141516171819L} would yield the byte array {@code {0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
   * 0x18, 0x19}}.
   *
   * <p>If you need to convert and concatenate several values (possibly even of different types),

        synchronized (indexUpdateCallback) {
            // required check
            if (!dataMap.containsKey(fessConfig.getIndexFieldUrl()) || dataMap.get(fessConfig.getIndexFieldUrl()) == null) {
                logger.warn("Could not add a doc. Invalid data: {}", dataMap);
                return;
            }

            final String url = dataMap.get(fessConfig.getIndexFieldUrl()).toString();

* Buat file `main.py` dengan:

```Python
from typing import Union

from fastapi import FastAPI

app = FastAPI()


@app.get("/")
def read_root():
    return {"Hello": "World"}


@app.get("/items/{item_id}")
def read_item(item_id: int, q: Union[str, None] = None):
    return {"item_id": item_id, "q": q}
```

<details markdown="1">

```Python
from typing import Union

from fastapi import FastAPI

app = FastAPI()


@app.get("/")
def read_root():
    return {"Hello": "World"}


@app.get("/items/{item_id}")
def read_item(item_id: int, q: Union[str, None] = None):
    return {"item_id": item_id, "q": q}
```

<details markdown="1">

            if (!createIndexResponse.isAcknowledged()) {
                if (logger.isDebugEnabled()) {
                    logger.debug("Could not create next index: {}", indexName);
                }
                throw new SuggesterException("Could not create next index: " + indexName);
            }

                 * guess most clients only support non-unicode so
                 * they don't run into this.
                 */

                /* UPDATE: Maybe not! Could this be a Unicode alignment issue. I hope
                 * so. We cannot just comment out this method and use readString of
                 * ServerMessageBlock.java because the arguments are different, however

// error returned in IAM subsystem when user doesn't exist.
var errNoSuchUser = errors.New("Specified user does not exist")

// error returned by IAM when a use a builtin IDP command when they could mean
// to use a LDAP command.
var errNoSuchUserLDAPWarn = errors.New("Specified user does not exist. If you meant a user in LDAP please use command under `mc idp ldap`")

// error returned when service account is not found

	// TX saturating, however there are situations where a RX might also saturate.
	// To avoid these problems we must split the work at scale. With 1000 node
	// setup becoming a reality we must try to shard the work properly such as
	// pick 10 nodes that precisely can send those 100 requests the first node
	// in the 10 node shard would coordinate between other 9 shards to get the