logNotificationTarget.expired();
    }

    @Test
    public void test_flush_callsExpired() {
        // flush() delegates to expired(); with empty buffer, no-op (no exception)
        logNotificationTarget.flush();
    }

    @Test
    public void test_expired_withEvents_drainsBuffer() {
        // Add events to buffer
        ComponentUtil.getLogNotificationHelper()

                }
            }
        } catch (final Exception e) {
            logger.debug("Failed to flush log notifications to OpenSearch.", e);
        }
    }

    /**
     * Flushes all buffered log notification events immediately.
     */
    public void flush() {
        expired();
    }

    private String resolveIndexName() {

        // flush() should work with in-memory data
        ContentOutputStream cos = new ContentOutputStream(10, Curl.tmpDir);
        cos.write(new byte[] { 0, 1, 2 });
        cos.flush();
        assertTrue(cos.isInMemory());
        cos.close();
    }

    @Test
    public void testFlushInFile() throws IOException {
        // flush() should work with file-based data

  public void close() throws IOException {
    try {
      state.close();
    } finally {
      reachabilityFence(byteSource);
    }
  }

  @Override
  public void flush() throws IOException {
    try {
      state.flush();
    } finally {
      reachabilityFence(byteSource);
    }
  }

  /**
   * Per-instance state, extracted to a separate object so that {@link FinalizableReference} can

    }

    /**
     * Stops the log notification timer and performs a final flush.
     */
    @PreDestroy
    public void destroy() {
        if (timeoutTask != null) {
            timeoutTask.cancel();
        }
        if (logNotificationTarget != null) {
            logNotificationTarget.flush();
        }
    }

    /**

      "Trailers cannot be read because the state is $state"
    }
    return trailers
  }

  override fun flushRequest() {
    socket.sink.flush()
  }

  override fun finishRequest() {
    socket.sink.flush()
  }

  /** Returns bytes of a request header for sending on an HTTP transport. */
  fun writeRequest(
    headers: Headers,
    requestLine: String,
  ) {

  private val minimumDeflateSize: Long,
) : Closeable {
  /** This holds outbound data for compression and masking. */
  private val messageBuffer = Buffer()

  /** The [Buffer] of [sink]. Write to this and then flush/emit [sink]. */
  private val sinkBuffer: Buffer = sink.buffer
  private var writerClosed = false

  /** Lazily initialized on first use. */
  private var messageDeflater: MessageDeflater? = null

        override fun publish(record: LogRecord) {
          val param = record.parameters?.firstOrNull() as? String
          debugHandler(JsseDebugMessage(record.message, param))
        }

        override fun flush() {
        }

        override fun close() {
        }
      },
    )
  }

      cleanupQueue.schedule(cleanupTask)
      return null
    }

    // Flush the journal before creating files to prevent file leaks.
    val journalWriter = this.journalWriter!!
    journalWriter
      .writeUtf8(DIRTY)
      .writeByte(' '.code)
      .writeUtf8(key)
      .writeByte('\n'.code)
    journalWriter.flush()

    if (hasJournalErrors) {

      throws IOException {
    if (singleByte) {
      for (int i = off; i < off + len; i++) {
        out.write(b[i]);
      }
    } else {
      out.write(b, off, len);
    }
    out.flush(); // for coverage
  }

  // TODO(chrisn): only works if we ensure we have crossed file threshold

  public void testWriteErrorAfterClose() throws Exception {
    byte[] data = newPreFilledByteArray(100);