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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.metrics;
import com.yahoo.metrics.util.ValueType;
import java.util.Collection;
/**
* @author thomasg
*/
public class LongValue
implements ValueMetric.Value<Long>
{
private int count;
private long min, max, last;
private long total;
public LongValue() {
count = 0;
min = Long.MAX_VALUE;
max = Long.MIN_VALUE;
last = 0;
total = 0;
}
@Override
public void add(Long v) {
LongValue val = this;
val.count = count + 1;
val.total = total + v;
val.min = Math.min(min, v);
val.max = Math.max(max, v);
val.last = v;
}
@Override
public void join(ValueMetric.Value<Long> v2, boolean createAverageOnJoin) {
LongValue value = this;
if (createAverageOnJoin) {
value.count = count + v2.getCount();
value.total = total + v2.getTotal();
value.last = v2.getLast();
} else {
double totalAverage = getAverage() + v2.getAverage();
value.count = count + v2.getCount();
value.total = (long) (totalAverage * value.count); // Total is "wrong" I guess.
value.last = last + v2.getLast();
}
value.min = Math.min(min, v2.getMin());
value.max = Math.max(max, v2.getMax());
}
@Override
public void add(ValueType other) {
LongValue dv = (LongValue) other;
count = count + dv.count;
total = total + dv.total;
min = Math.min(min, dv.min);
max = Math.max(max, dv.max);
last = dv.last;
}
@Override
public ValueType join(Collection<ValueType> sources, JoinBehavior joinBehavior) {
LongValue result = new LongValue();
for (ValueType t : sources) {
LongValue dv = (LongValue) t;
result.count = result.count + dv.count;
result.total = result.total + dv.total;
result.min = Math.min(result.min, dv.min);
result.max = Math.max(result.max, dv.max);
result.last += dv.last;
}
if (joinBehavior == JoinBehavior.AVERAGE_ON_JOIN) {
result.last /= sources.size();
} else {
result.total *= sources.size();
}
return result;
}
@Override
public boolean overflow(ValueMetric.Value<Long> v2) {
if (count > (count + v2.getCount())) {
return true;
}
if (v2.getTotal() > 0 && getTotal() > getTotal() + v2.getTotal()) {
return true;
}
if (v2.getTotal() < 0 && getTotal() < getTotal() + v2.getTotal()) {
return true;
}
return false;
}
@Override
public int getCount() { return count; }
@Override
public Long getMin() { return (count > 0) ? min : 0; }
@Override
public Long getMax() { return (count > 0) ? max : 0; }
@Override
public Long getLast() { return last; }
@Override
public Long getTotal() { return total; }
@Override
public Double getAverage() {
if (count == 0) {
return 0.0;
}
return ((double) total) / count;
}
@Override
public String valueToString(Long val) {
if (val == Long.MIN_VALUE || val == Long.MAX_VALUE) {
return valueToString((long)0);
}
return val.toString();
}
@Override
public LongValue clone() {
try{
return (LongValue) super.clone();
} catch (CloneNotSupportedException e) { return null; }
}
@Override
public ValueMetric.Value<Long> copyObject() {
return clone();
}
}
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