}

    @ParameterizedTest(name = "session error {1} -\\u003e {2}")
    @CsvSource({ "-1,Connection refused", "0x80,Not listening on called name", "0x81,Not listening for calling name",
            "0x82,Called name not present", "0x83,Called name present, but insufficient resources", "0x8F,Unspecified error",
            "999,Unknown error code: 999" })
    @DisplayName("getErrorString for SSN service errors")

                result.append("Not listening on called name");
                break;
            case NOT_LISTENING_CALLING:
                result.append("Not listening for calling name");
                break;
            case CALLED_NOT_PRESENT:
                result.append("Called name not present");
                break;
            case NO_RESOURCES:
                result.append("Called name present, but insufficient resources");

    private @Nullable Iterator<? extends Iterator<? extends T>> getTopMetaIterator() {
      while (topMetaIterator == null || !topMetaIterator.hasNext()) {
        if (metaIterators != null && !metaIterators.isEmpty()) {
          topMetaIterator = metaIterators.removeFirst();
        } else {
          return null;
        }
      }
      return topMetaIterator;

    public Listener() {}

    /**
     * Called when the service transitions from {@linkplain State#NEW NEW} to {@linkplain
     * State#STARTING STARTING}. This occurs when {@link Service#startAsync} is called the first
     * time.
     */
    public void starting() {}

    /**
     * Called when the service transitions from {@linkplain State#STARTING STARTING} to {@linkplain

        if (onDestroyListener != null) {
            onDestroyListener.onDestroy(p);
        }
    }

    /**
     * Listener interface for handling object destruction events.
     * @param <T> The type of the pooled object
     */
    public interface OnDestroyListener<T> {
        /**
         * Called when a pooled object is being destroyed.

    }

    /**
     * Null pointer scenario – calls on a null reference should raise
     * {@link NullPointerException}. This test is defensive; in real code it
     * would likely be handled elsewhere.
     */
    @Test
    @DisplayName("calling getters on null reference throws NPE")
    void testNullReference() {
        AllocInfo nullRef = null;

        // When
        String firstName = mockAddress.firstCalledName();

        // Then
        assertEquals(expectedFirstName, firstName, "Should return first called name");
        assertNotNull(firstName, "First called name should not be null");
    }

    @Test
    @DisplayName("nextCalledName should return valid name for fallback attempts")
    void testNextCalledNameContract() {
        // Given

        JobNotFoundException exception = new JobNotFoundException("Fill stack trace test");

        Throwable filled = exception.fillInStackTrace();

        assertNotNull(filled);
        assertEquals(exception, filled);
        assertNotNull(filled.getStackTrace());
        assertTrue(filled.getStackTrace().length > 0);
    }

    public void test_getMessage_consistency() {

But by following the steps above, it will be able to do some performance optimizations.

## Technical Details { #technical-details }

Modern versions of Python have support for **"asynchronous code"** using something called **"coroutines"**, with **`async` and `await`** syntax.

Let's see that phrase by parts in the sections below:

* **Asynchronous Code**
* **`async` and `await`**
* **Coroutines**

	ResumeItemsSkipped uint64 `json:"-"`
	ResumeBytesDone    uint64 `json:"-"`
	ResumeBytesFailed  uint64 `json:"-"`
	ResumeBytesSkipped uint64 `json:"-"`

	// Filled on startup/restarts.
	QueuedBuckets []string

	// Filled during heal.
	HealedBuckets []string

	// ID of the current healing operation
	HealID string

	ItemsSkipped uint64
	BytesSkipped uint64

	RetryAttempts uint64