public void accept()

in oap-server/server-core/src/main/java/org/apache/skywalking/oap/server/core/analysis/meter/function/avg/AvgHistogramPercentileFunction.java [118:167]
45 lines of code
13 McCabe index (conditional complexity)

    public void accept(final MeterEntity entity, final PercentileArgument value) {
        if (dataset.size() > 0) {
            if (!value.getBucketedValues().isCompatible(dataset)) {
                throw new IllegalArgumentException(
                    "Incompatible BucketedValues [" + value + "] for current PercentileFunction[" + dataset + "]");
            }
        }

        for (final int rank : value.getRanks()) {
            if (rank <= 0) {
                throw new IllegalArgumentException("Illegal rank value " + rank + ", must be positive");
            }
        }

        if (ranks.size() > 0) {
            if (ranks.size() != value.getRanks().length) {
                throw new IllegalArgumentException(
                    "Incompatible ranks size = [" + value.getRanks().length + "] for current PercentileFunction[" + ranks
                        .size() + "]");
            } else {
                for (final int rank : value.getRanks()) {
                    if (!ranks.include(rank)) {
                        throw new IllegalArgumentException(
                            "Rank " + rank + " doesn't exist in the previous ranks " + ranks);
                    }
                }
            }
        } else {
            for (final int rank : value.getRanks()) {
                ranks.add(rank);
            }
        }

        this.entityId = entity.id();

        String template = "%s";
        if (CollectionUtils.isNotEmpty(value.getBucketedValues().getLabels())) {
            template  = value.getBucketedValues().getLabels() + ":%s";
        }
        final long[] values = value.getBucketedValues().getValues();
        for (int i = 0; i < values.length; i++) {
            long bucket = value.getBucketedValues().getBuckets()[i];
            String bucketName = bucket == Long.MIN_VALUE ? Bucket.INFINITE_NEGATIVE : String.valueOf(bucket);
            String key = String.format(template, bucketName);
            summation.valueAccumulation(key, values[i]);
            count.valueAccumulation(key, 1L);
        }

        this.isCalculated = false;
    }