public void collect()

in hertzbeat-collector/hertzbeat-collector-basic/src/main/java/org/apache/hertzbeat/collector/collect/smtp/SmtpCollectImpl.java [53:113]
60 lines of code
9 McCabe index (conditional complexity)

    public void collect(CollectRep.MetricsData.Builder builder, Metrics metrics) {
        long startTime = System.currentTimeMillis();
        SmtpProtocol smtpProtocol = metrics.getSmtp();
        String host = smtpProtocol.getHost();
        String port = smtpProtocol.getPort();
        int timeout = CollectUtil.getTimeout(smtpProtocol.getTimeout());
        SMTP smtp = null;
        try {
            smtp = new SMTP();
            smtp.setConnectTimeout(timeout);
            smtp.setCharset(StandardCharsets.UTF_8);
            smtp.connect(host, Integer.parseInt(port));
            if (smtp.isConnected()) {
                long responseTime = System.currentTimeMillis() - startTime;
                List<String> aliasFields = metrics.getAliasFields();

                Map<String, String> resultMap = execCmdAndParseResult(smtp, smtpProtocol.getCmd(), smtpProtocol);
                resultMap.put(CollectorConstants.RESPONSE_TIME, Long.toString(responseTime));
                if (resultMap.size() < aliasFields.size()) {
                    log.error("smtp response data not enough: {}", resultMap);
                    builder.setCode(CollectRep.Code.FAIL);
                    builder.setMsg("The cmd execution results do not match the expected number of metrics.");
                    return;
                }
                CollectRep.ValueRow.Builder valueRowBuilder = CollectRep.ValueRow.newBuilder();
                for (String field : aliasFields) {
                    String fieldValue = resultMap.get(field);
                    valueRowBuilder.addColumn(Objects.requireNonNullElse(fieldValue, CommonConstants.NULL_VALUE));
                }
                builder.addValueRow(valueRowBuilder.build());
            } else {
                builder.setCode(CollectRep.Code.UN_CONNECTABLE);
                builder.setMsg("Peer connect failed，Timeout " + timeout + "ms");
                return;
            }
            smtp.disconnect();
        } catch (SocketException socketException) {
            String errorMsg = CommonUtil.getMessageFromThrowable(socketException);
            log.debug(errorMsg);
            builder.setCode(CollectRep.Code.UN_CONNECTABLE);
            builder.setMsg("The peer refused to connect: service port does not listening or firewall: " + errorMsg);
        } catch (IOException ioException) {
            String errorMsg = CommonUtil.getMessageFromThrowable(ioException);
            log.info(errorMsg);
            builder.setCode(CollectRep.Code.UN_CONNECTABLE);
            builder.setMsg("Peer connect failed: " + errorMsg);
        } catch (Exception e) {
            String errorMsg = CommonUtil.getMessageFromThrowable(e);
            log.warn(errorMsg, e);
            builder.setCode(CollectRep.Code.FAIL);
            builder.setMsg(errorMsg);
        } finally {
            if (smtp != null) {
                try {
                    smtp.disconnect();
                } catch (Exception e) {
                    log.warn(e.getMessage());
                }
            }
        }
    }