public void reportMetrics()

in src/main/core-impl/java/com/mysql/cj/log/BaseMetricsHolder.java [184:293]
86 lines of code
19 McCabe index (conditional complexity)

    public void reportMetrics(Log log) {
        StringBuilder logMessage = new StringBuilder(256);

        logMessage.append("** Performance Metrics Report **\n");
        logMessage.append("\nLongest reported query: " + this.longestQueryTimeMs + " ms");
        logMessage.append("\nShortest reported query: " + this.shortestQueryTimeMs + " ms");
        logMessage.append("\nAverage query execution time: " + this.totalQueryTimeMs / this.numberOfQueriesIssued + " ms");
        logMessage.append("\nNumber of statements executed: " + this.numberOfQueriesIssued);
        logMessage.append("\nNumber of result sets created: " + this.numberOfResultSetsCreated);
        logMessage.append("\nNumber of statements prepared: " + this.numberOfPrepares);
        logMessage.append("\nNumber of prepared statement executions: " + this.numberOfPreparedExecutes);

        if (this.perfMetricsHistBreakpoints != null) {
            logMessage.append("\n\n\tTiming Histogram:\n");
            int maxNumPoints = 20;
            int highestCount = Integer.MIN_VALUE;

            for (int i = 0; i < HISTOGRAM_BUCKETS; i++) {
                if (this.perfMetricsHistCounts[i] > highestCount) {
                    highestCount = this.perfMetricsHistCounts[i];
                }
            }

            if (highestCount == 0) {
                highestCount = 1; // avoid DIV/0
            }

            for (int i = 0; i < HISTOGRAM_BUCKETS - 1; i++) {

                if (i == 0) {
                    logMessage.append("\n\tless than " + this.perfMetricsHistBreakpoints[i + 1] + " ms: \t" + this.perfMetricsHistCounts[i]);
                } else {
                    logMessage.append("\n\tbetween " + this.perfMetricsHistBreakpoints[i] + " and " + this.perfMetricsHistBreakpoints[i + 1] + " ms: \t"
                            + this.perfMetricsHistCounts[i]);
                }

                logMessage.append("\t");

                int numPointsToGraph = (int) (maxNumPoints * ((double) this.perfMetricsHistCounts[i] / highestCount));

                for (int j = 0; j < numPointsToGraph; j++) {
                    logMessage.append("*");
                }

                if (this.longestQueryTimeMs < this.perfMetricsHistCounts[i + 1]) {
                    break;
                }
            }

            if (this.perfMetricsHistBreakpoints[HISTOGRAM_BUCKETS - 2] < this.longestQueryTimeMs) {
                logMessage.append("\n\tbetween ");
                logMessage.append(this.perfMetricsHistBreakpoints[HISTOGRAM_BUCKETS - 2]);
                logMessage.append(" and ");
                logMessage.append(this.perfMetricsHistBreakpoints[HISTOGRAM_BUCKETS - 1]);
                logMessage.append(" ms: \t");
                logMessage.append(this.perfMetricsHistCounts[HISTOGRAM_BUCKETS - 1]);
            }
        }

        if (this.numTablesMetricsHistBreakpoints != null) {
            logMessage.append("\n\n\tTable Join Histogram:\n");
            int maxNumPoints = 20;
            int highestCount = Integer.MIN_VALUE;

            for (int i = 0; i < HISTOGRAM_BUCKETS; i++) {
                if (this.numTablesMetricsHistCounts[i] > highestCount) {
                    highestCount = this.numTablesMetricsHistCounts[i];
                }
            }

            if (highestCount == 0) {
                highestCount = 1; // avoid DIV/0
            }

            for (int i = 0; i < HISTOGRAM_BUCKETS - 1; i++) {

                if (i == 0) {
                    logMessage.append("\n\t" + this.numTablesMetricsHistBreakpoints[i + 1] + " tables or less: \t\t" + this.numTablesMetricsHistCounts[i]);
                } else {
                    logMessage.append("\n\tbetween " + this.numTablesMetricsHistBreakpoints[i] + " and " + this.numTablesMetricsHistBreakpoints[i + 1]
                            + " tables: \t" + this.numTablesMetricsHistCounts[i]);
                }

                logMessage.append("\t");

                int numPointsToGraph = (int) (maxNumPoints * ((double) this.numTablesMetricsHistCounts[i] / highestCount));

                for (int j = 0; j < numPointsToGraph; j++) {
                    logMessage.append("*");
                }

                if (this.maximumNumberTablesAccessed < this.numTablesMetricsHistBreakpoints[i + 1]) {
                    break;
                }
            }

            if (this.numTablesMetricsHistBreakpoints[HISTOGRAM_BUCKETS - 2] < this.maximumNumberTablesAccessed) {
                logMessage.append("\n\tbetween ");
                logMessage.append(this.numTablesMetricsHistBreakpoints[HISTOGRAM_BUCKETS - 2]);
                logMessage.append(" and ");
                logMessage.append(this.numTablesMetricsHistBreakpoints[HISTOGRAM_BUCKETS - 1]);
                logMessage.append(" tables: ");
                logMessage.append(this.numTablesMetricsHistCounts[HISTOGRAM_BUCKETS - 1]);
            }
        }

        log.logInfo(logMessage);

        //this.metricsLastReportedMs = System.currentTimeMillis();
    }