in src/main/java/org/apache/commons/pool3/impl/BaseGenericObjectPool.java [306:317]
public long getMean() {
double result = 0;
int counter = 0;
for (int i = 0; i < size; i++) {
final long value = values[i].get();
if (value != NULL) {
counter++;
result = result * ((counter - 1) / (double) counter) + value / (double) counter;
}
}
return (long) result;
}