// Add events to buffer
        ComponentUtil.getLogNotificationHelper()
                .offer(new LogNotificationEvent(System.currentTimeMillis(), "ERROR", "org.test", "msg1", null));
        ComponentUtil.getLogNotificationHelper()
                .offer(new LogNotificationEvent(System.currentTimeMillis(), "WARN", "org.test", "msg2", null));

        // expired() will drain buffer then fail on OpenSearch (not available) but should not throw

            logNotificationTarget.flush();
        }
    }

    /**
     * Offers an event to the buffer. If the buffer exceeds the maximum size, the oldest event is dropped.
     *
     * @param event the log notification event to add
     */
    public void offer(final LogNotificationEvent event) {
        int maxBufferSize;
        try {

    int initialBufferSize = min(BUFFER_SIZE, max(128, Integer.highestOneBit(totalLen) * 2));
    // Starting with an 8k buffer, double the size of each successive buffer. Smaller buffers
    // quadruple in size until they reach 8k, to minimize the number of small reads for longer
    // streams. Buffers are retained in a deque so that there's no copying between buffers while

        try (InputStream in = inputStream; ByteArrayOutputStream out = new ByteArrayOutputStream()) {
            byte[] buffer = new byte[8192];
            int read;
            while ((read = in.read(buffer)) >= 0) {
                out.write(buffer, 0, read);
            }
            return out.toString(StandardCharsets.UTF_8.name());
        }
    }

        LogNotificationHelper helper = new LogNotificationHelper();
        // Default buffer size is 1000; offer more than that
        for (int i = 0; i < 1100; i++) {
            helper.offer(new LogNotificationEvent(i, "ERROR", "org.test", "msg" + i, null));
        }
        List<LogNotificationEvent> events = helper.drainAll();
        // Should be capped at buffer size (1000)
        assertTrue(events.size() <= 1000);

    ([CVE-2021-37649](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-37649))
*   Fixes a segfault and a heap buffer overflow in
    `{Experimental,}DatasetToTFRecord`
    ([CVE-2021-37650](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-37650))
*   Fixes a heap buffer overflow in `FractionalAvgPoolGrad`
    ([CVE-2021-37651](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-37651))

import org.codelibs.fess.helper.LogNotificationHelper;
import org.codelibs.fess.helper.LogNotificationHelper.LogNotificationEvent;

/**
 * Custom Log4j2 Appender that captures log events into a buffer for notification purposes.
 */
@Plugin(name = "LogNotificationAppender", category = Core.CATEGORY_NAME, elementType = Appender.ELEMENT_TYPE, printObject = true)
public class LogNotificationAppender extends AbstractAppender {

 * the queue the shortest time. New elements are inserted at the tail of the queue, and the queue
 * retrieval operations obtain elements at the head of the queue.
 *
 * <p>This is a classic &quot;bounded buffer&quot;, in which a fixed-sized array holds elements
 * inserted by producers and extracted by consumers. Once created, the capacity cannot be increased.

     * Get the value for the key 'log.notification.buffer.size'. <br>
     * The value is, e.g. 1000 <br>
     * comment: Maximum number of events to buffer in memory.
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getLogNotificationBufferSize();

    /**
     * Get the value for the key 'log.notification.buffer.size' as {@link Integer}. <br>

   */
  @CanIgnoreReturnValue // pushed down from class to method
  @Override
  public boolean add(E e) {
    return offer(e);
  }

  /**
   * Inserts the specified element into this priority queue.
   *
   * @param e the element to add
   * @return {@code true} (as specified by {@link Queue#offer})
   * @throws ClassCastException if the specified element cannot be compared with elements currently