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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.MetricValueSet;
import com.yahoo.metrics.util.ValueType;
import com.yahoo.metrics.util.HasCopy;
import com.yahoo.text.Utf8String;
import com.yahoo.text.XMLWriter;
import java.util.Collection;
import java.util.Locale;
import java.util.logging.Logger;
/**
* A metric that counts something. The value should always be positive.
*/
@SuppressWarnings("unchecked")
public class CountMetric extends Metric {
public static final int LOG_IF_UNSET = 2;
private static final Utf8String AVERAGE_CHANGE_PER_SECOND = new Utf8String("average_change_per_second");
private static final Utf8String COUNT = new Utf8String("count");
private static final Logger log = Logger.getLogger(CountMetric.class.getName());
private final MetricValueSet<CountValue> values;
private int flags;
public CountMetric(String name, String tags, String description, MetricSet owner) {
super(name, tags, description, owner);
values = new MetricValueSet<CountValue>();
flags = LOG_IF_UNSET;
}
public CountMetric(CountMetric other, CopyType copyType, MetricSet owner) {
super(other, owner);
values = new MetricValueSet<CountValue>(other.values, copyType == CopyType.CLONE ? other.values.size() : 1);
flags = other.flags;
}
private CountValue getValues() {
return values.getValue();
}
public long getValue() {
CountValue val = getValues();
return (val == null ? 0 : val.value);
}
@SuppressWarnings("UnusedDeclaration")
public void logOnlyIfSet() {
flags &= LOG_IF_UNSET;
}
public void set(long value) {
while (!values.setValue(new CountValue(value))) {
// try again
}
}
public void inc() {
inc(1);
}
public void dec() {
dec(1);
}
public void inc(long i) {
boolean overflow;
CountValue val;
do {
val = getValues();
if (val == null) {
val = new CountValue(0);
}
overflow = (val.value + i < val.value);
val.value += i;
} while (!values.setValue(val));
if (overflow) {
reset();
log.fine("Overflow in metric " + getName() + ". Resetting it.");
}
}
public void dec(long i) {
boolean underflow;
CountValue val;
do {
val = getValues();
if (val == null) {
val = new CountValue(0);
}
underflow = (val.value - i > val.value);
val.value -= i;
} while (!values.setValue(val));
if (underflow) {
reset();
log.fine("Underflow in metric " + getName() + ". Resetting it.");
}
}
@Override
public void reset() {
values.reset();
}
@Override
public boolean logFromTotalMetrics() {
return true;
}
@Override
public void logEvent(EventLogger logger, String fullName) {
CountValue val = getValues();
if ((flags & LOG_IF_UNSET) != 0 || val != null) {
logger.count(fullName, val == null ? 0 : val.value);
}
}
@Override
public void printXml(XMLWriter writer,
int secondsPassed,
int verbosity)
{
CountValue valRef = getValues();
if (valRef == null && verbosity < 2) {
return;
}
long val = valRef != null ? valRef.value : 0;
openXMLTag(writer, verbosity);
writer.attribute(COUNT, String.valueOf(val));
if (secondsPassed > 0) {
writer.attribute(AVERAGE_CHANGE_PER_SECOND,
String.format(Locale.US, "%.2f", (double)val / secondsPassed));
}
writer.closeTag();
}
// Only one metric in valuemetric, so return it on any id.
@Override
public long getLongValue(String id) {
CountValue val = getValues();
return (val == null ? 0 : val.value);
}
@Override
public double getDoubleValue(String id) {
CountValue val = getValues();
return (val == null ? 0 : val.value);
}
@Override
public boolean used() {
return getValues() != null;
}
@Override
public void addToSnapshot(Metric m) {
CountValue val = getValues();
if (val != null) {
((CountMetric)m).inc(val.value);
}
}
@Override
public void addToPart(Metric m) {
CountValue val = getValues();
if (val != null) {
((CountMetric)m).inc(val.value);
}
}
@Override
public Metric clone(CopyType type, MetricSet owner, boolean includeUnused) {
return new CountMetric(this, type, owner);
}
private static class CountValue implements ValueType, HasCopy<CountValue> {
long value;
private CountValue(long value) {
this.value = value;
}
public CountValue clone() {
try {
return (CountValue)super.clone();
} catch (CloneNotSupportedException e) {
return null;
}
}
public void add(ValueType other) {
value += ((CountValue)other).value;
}
public ValueType join(Collection<ValueType> sources, JoinBehavior joinBehavior) {
CountValue result = new CountValue(0);
for (ValueType t : sources) {
result.add(t);
}
if (joinBehavior == JoinBehavior.AVERAGE_ON_JOIN) {
result.value /= sources.size();
}
return result;
}
public String toString() {
return Long.toString(value);
}
public CountValue copyObject() {
return new CountValue(value);
}
}
}
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