switch (errorClass) {
        case SUCCESS:
            result.append("SUCCESS");
            break;
        case ERR_NAM_SRVC:
            result.append("ERR_NAM_SRVC/");
            switch (errorCode) {
            case FMT_ERR:
                result.append("FMT_ERR: Format Error");
            default:
                result.append("Unknown error code: ").append(errorCode);
            }
            break;

	o = msgp.Require(b, z.Msgsize())
	// map header, size 6
	// string "APIVersion"
	o = append(o, 0x86, 0xaa, 0x41, 0x50, 0x49, 0x56, 0x65, 0x72, 0x73, 0x69, 0x6f, 0x6e)
	o = msgp.AppendString(o, z.APIVersion)
	// string "Bucket"
	o = append(o, 0xa6, 0x42, 0x75, 0x63, 0x6b, 0x65, 0x74)
	o = msgp.AppendString(o, z.Bucket)
	// string "Prefix"
	o = append(o, 0xa6, 0x50, 0x72, 0x65, 0x66, 0x69, 0x78)
	o, err = z.Prefix.MarshalMsg(o)

            } catch (final Exception e) {
                final StringBuilder buf = createStringBuffer(keyObj, getCurrentTimeMillis());
                buf.append('\t').append("action:begin");
                buf.append('\t').append("error:").append(escapeValue(e.getLocalizedMessage()).replaceAll("\\s", " "));
                log(buf);
            }
        });
    }

    /**

        StringBuilder sb = new StringBuilder();
        sb.append("SmbOperationException{");
        sb.append("errorCode=").append(errorCode);
        sb.append(", category=").append(errorCode.getCategory());
        sb.append(", retryable=").append(isRetryable());
        sb.append(", attempt=").append(attemptNumber);
        sb.append(", operation='").append(operationName).append('\'');

        if (ntStatus != 0) {

                return tempBuf.toString();
            }).collect(Collectors.joining(","));
            buf.append(hotThreads).append(',');
        } catch (final Exception e) {
            appendException(buf, e).append(',');
        }

        appendTimestamp(buf);
        buf.append('}');

        if (logger.isInfoEnabled()) {
            logger.info(buf.toString());
        }
    }

            }
            resultBuf.append("Status of ")
                    .append(ping.getClusterName())
                    .append(" is changed to ")
                    .append(ping.getClusterStatus())
                    .append('.');
        } else if (status == 0) {
            resultBuf.append(ping.getClusterName()).append(" is alive.");
        } else {

                .append(",ntlmsspFlags=0x")
                .append(Hexdump.toHexString(ntlmsspFlags, 8))
                .append(",workstation=")
                .append(workstation)
                .append(",isEstablished=")
                .append(isEstablished)
                .append(",state=")
                .append(state)
                .append(",serverChallenge=");

Here, the `shutdown` event handler function will write a text line `"Application shutdown"` to a file `log.txt`.

/// info

In the `open()` function, the `mode="a"` means "append", so, the line will be added after whatever is on that file, without overwriting the previous contents.

///

/// tip

	o = append(o, 0x82, 0xa5, 0x43, 0x6f, 0x75, 0x6e, 0x74)
	o = msgp.AppendFloat64(o, z.Avg.Count)
	// string "Bytes"
	o = append(o, 0xa5, 0x42, 0x79, 0x74, 0x65, 0x73)
	o = msgp.AppendFloat64(o, z.Avg.Bytes)
	// string "pq"
	o = append(o, 0xa2, 0x70, 0x71)
	// map header, size 2
	// string "Count"
	o = append(o, 0x82, 0xa5, 0x43, 0x6f, 0x75, 0x6e, 0x74)
	o = msgp.AppendFloat64(o, z.Max.Count)
	// string "Bytes"

				if curIdx := getRIndex(sorted, c.name); curIdx == -1 {
					// if before callback already sorted, append current callback just after it
					sorted = append(sorted[:sortedIdx], append([]string{c.name}, sorted[sortedIdx:]...)...)
				} else if curIdx > sortedIdx {
					return fmt.Errorf("conflicting callback %s with before %s", c.name, c.before)
				}
			} else if idx := getRIndex(names, c.before); idx != -1 {
				// if before callback exists