public void merge(QuantileDigest other) {
rescaleToCommonLandmark(this, other);
// 2. merge other into this (don't modify other)
root = merge(root, other.root);
max = Math.max(max, other.max);
min = Math.min(min, other.min);
// 3. compress to remove unnecessary nodes
compress();
}
/** Adds a value to this digest. The value must be {@code >= 0} */
public void add(long value, long count) {
checkArgument(count > 0, "count must be > 0");
long nowInSeconds = TimeUnit.NANOSECONDS.toSeconds(ticker.read());
int maxExpectedNodeCount = 3 * calculateCompressionFactor();
if (nowInSeconds - landmarkInSeconds >= RESCALE_THRESHOLD_SECONDS) {
rescale(nowInSeconds);
compress(); // need to compress to get rid of nodes that may have decayed to ~ 0
} else if (nonZeroNodeCount > MAX_SIZE_FACTOR * maxExpectedNodeCount && compressAutomatically) {
// The size (number of non-zero nodes) of the digest is at most 3 * compression factor
// If we're over MAX_SIZE_FACTOR of the expected size, compress
// Note: we don't compress as soon as we go over expectedNodeCount to avoid unnecessarily
// running a compression for every new added element when we're close to boundary
compress();
}
double weight = weight(TimeUnit.NANOSECONDS.toSeconds(ticker.read())) * count;
max = Math.max(max, value);
min = Math.min(min, value);
insert(longToBits(value), weight);
}