Add AggregateMetricReader able to aggregate counters and gauges
Different physical sources for the same logical metric just need to publish them with a period-separated prefix, and this reader will aggregate (by truncating the metric names, dropping the prefix). Very useful (for instance) if multiple application instances are feeding to a central (e.g. redis) repository and you want to display the results. Useful in conjunction with a MetricReaderPublicMetrics for hooking up to the /metrics endpoint.pull/2938/merge
Dave Syer
10 years ago
committed by
Andy Wilkinson
parent
710423d176
commit
0fde04d325
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/*
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* Copyright 2014-2015 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.springframework.boot.actuate.metrics.aggregate;
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import java.util.HashSet;
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import java.util.Set;
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import org.springframework.boot.actuate.metrics.Metric;
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import org.springframework.boot.actuate.metrics.reader.MetricReader;
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import org.springframework.boot.actuate.metrics.repository.InMemoryMetricRepository;
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import org.springframework.util.StringUtils;
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/**
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* A metric reader that aggregates values from a source reader, normally one that has been
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* collecting data from many sources in the same form (like a scaled-out application). The
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* source has metrics with names in the form <code>*.*.counter.**</code> and
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* <code>*.*.[anything].**</code> (the length of the prefix is controlled by the
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* {@link #setTruncateKeyLength(int) truncateKeyLength} property, and defaults to 2,
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* meaning 2 period separated fields), and the result has metric names in the form
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* <code>aggregate.count.**</code> and <code>aggregate.[anything].**</code>. Counters are
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* summed and anything else (i.e. gauges) are aggregated by choosing the most recent
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* value.
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*
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* @author Dave Syer
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*
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*/
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public class AggregateMetricReader implements MetricReader {
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private MetricReader source;
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private int truncate = 2;
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private String prefix = "aggregate.";
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public AggregateMetricReader(MetricReader source) {
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this.source = source;
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}
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/**
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* The number of period-separated keys to remove from the start of the input metric
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* names before aggregating.
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*
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* @param truncate length of source metric prefixes
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*/
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public void setTruncateKeyLength(int truncate) {
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this.truncate = truncate;
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}
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/**
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* Prefix to apply to all output metrics. A period will be appended if no present in
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* the provided value.
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*
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* @param prefix the prefix to use default "aggregator.")
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*/
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public void setPrefix(String prefix) {
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this.prefix = prefix.endsWith(".") ? prefix : prefix + ".";
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}
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@Override
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public Metric<?> findOne(String metricName) {
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if (!metricName.startsWith(this.prefix)) {
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return null;
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}
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InMemoryMetricRepository result = new InMemoryMetricRepository();
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String baseName = metricName.substring(this.prefix.length());
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for (Metric<?> metric : this.source.findAll()) {
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String name = getSourceKey(metric.getName());
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if (baseName.equals(name)) {
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update(result, name, metric);
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}
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}
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return result.findOne(metricName);
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}
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@Override
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public Iterable<Metric<?>> findAll() {
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InMemoryMetricRepository result = new InMemoryMetricRepository();
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for (Metric<?> metric : this.source.findAll()) {
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String key = getSourceKey(metric.getName());
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if (key != null) {
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update(result, key, metric);
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}
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}
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return result.findAll();
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}
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@Override
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public long count() {
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Set<String> names = new HashSet<String>();
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for (Metric<?> metric : this.source.findAll()) {
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String name = getSourceKey(metric.getName());
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if (name != null) {
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names.add(name);
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}
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}
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return names.size();
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}
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private void update(InMemoryMetricRepository result, String key, Metric<?> metric) {
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String name = this.prefix + key;
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Metric<?> aggregate = result.findOne(name);
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if (aggregate == null) {
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aggregate = new Metric<Number>(name, metric.getValue(), metric.getTimestamp());
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}
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else if (key.startsWith("counter")) {
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// accumulate all values
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aggregate = new Metric<Number>(name, metric.increment(
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aggregate.getValue().intValue()).getValue(), metric.getTimestamp());
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}
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else if (aggregate.getTimestamp().before(metric.getTimestamp())) {
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// sort by timestamp and only take the latest
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aggregate = new Metric<Number>(name, metric.getValue(), metric.getTimestamp());
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}
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result.set(aggregate);
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}
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private String getSourceKey(String name) {
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String[] keys = StringUtils.delimitedListToStringArray(name, ".");
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if (keys.length <= this.truncate) {
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return null;
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}
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StringBuilder builder = new StringBuilder(keys[this.truncate]);
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for (int i = this.truncate + 1; i < keys.length; i++) {
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builder.append(".").append(keys[i]);
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}
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return builder.toString();
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}
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}
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@ -0,0 +1,87 @@
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/*
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* Copyright 2012-2015 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.springframework.boot.actuate.metrics.aggregate;
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import java.util.Date;
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import org.junit.Test;
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import org.springframework.boot.actuate.metrics.Metric;
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import org.springframework.boot.actuate.metrics.repository.InMemoryMetricRepository;
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import org.springframework.boot.actuate.metrics.writer.Delta;
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import static org.junit.Assert.assertEquals;
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import static org.junit.Assert.assertNull;
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/**
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* @author Dave Syer
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*/
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public class AggregateMetricReaderTests {
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private InMemoryMetricRepository source = new InMemoryMetricRepository();
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private AggregateMetricReader reader = new AggregateMetricReader(this.source);
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@Test
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public void writeAndReadDefaults() {
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this.source.set(new Metric<Double>("foo.bar.spam", 2.3));
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assertEquals(2.3, this.reader.findOne("aggregate.spam").getValue());
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}
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@Test
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public void writeAndReadLatestValue() {
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this.source.set(new Metric<Double>("foo.bar.spam", 2.3, new Date(100L)));
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this.source.set(new Metric<Double>("oof.rab.spam", 2.4, new Date(0L)));
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assertEquals(2.3, this.reader.findOne("aggregate.spam").getValue());
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}
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@Test
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public void writeAndReadExtraLong() {
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this.source.set(new Metric<Double>("blee.foo.bar.spam", 2.3));
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this.reader.setTruncateKeyLength(3);
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assertEquals(2.3, this.reader.findOne("aggregate.spam").getValue());
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}
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@Test
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public void onlyPrefixed() {
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this.source.set(new Metric<Double>("foo.bar.spam", 2.3));
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assertNull(this.reader.findOne("spam"));
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}
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@Test
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public void incrementCounter() {
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this.source.increment(new Delta<Long>("foo.bar.counter.spam", 2L));
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this.source.increment(new Delta<Long>("oof.rab.counter.spam", 3L));
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assertEquals(5L, this.reader.findOne("aggregate.counter.spam").getValue());
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}
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@Test
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public void countGauges() {
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this.source.set(new Metric<Double>("foo.bar.spam", 2.3));
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this.source.set(new Metric<Double>("oof.rab.spam", 2.4));
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assertEquals(1, this.reader.count());
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}
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@Test
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public void countGaugesAndCounters() {
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this.source.set(new Metric<Double>("foo.bar.spam", 2.3));
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this.source.set(new Metric<Double>("oof.rab.spam", 2.4));
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this.source.increment(new Delta<Long>("foo.bar.counter.spam", 2L));
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this.source.increment(new Delta<Long>("oof.rab.counter.spam", 3L));
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assertEquals(2, this.reader.count());
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}
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}
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