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97 lines
3.7 KiB
Java
97 lines
3.7 KiB
Java
// Copyright 2017 The Nomulus Authors. All Rights Reserved.
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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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package google.registry.monitoring.metrics.contrib;
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import static com.google.common.truth.Truth.assertAbout;
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import com.google.common.collect.BoundType;
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import com.google.common.collect.Range;
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import com.google.common.truth.FailureMetadata;
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import google.registry.monitoring.metrics.Distribution;
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import google.registry.monitoring.metrics.Metric;
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import google.registry.monitoring.metrics.MetricPoint;
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import java.util.Map;
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import javax.annotation.Nullable;
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/**
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* Truth subject for the {@link Metric<Distribution>} class.
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*
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* <p>For use with the Google <a href="https://google.github.io/truth/">Truth</a> framework. Usage:
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*
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* <pre> assertThat(myDistributionMetric)
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* .hasAnyValueForLabels("label1", "label2", "label3")
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* .and()
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* .hasNoOtherValues();
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* assertThat(myDistributionMetric)
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* .doesNotHaveAnyValueForLabels("label1", "label2");
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* </pre>
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*
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* <p>The assertions treat an empty distribution as no value at all. This is not how the data is
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* actually stored; event metrics do in fact have an empty distribution after they are reset. But
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* it's difficult to write assertions about expected metric data when any number of empty
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* distributions can also be present, so they are screened out for convenience.
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*/
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public final class DistributionMetricSubject
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extends AbstractMetricSubject<Distribution, DistributionMetricSubject> {
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/** {@link Subject.Factory} for assertions about {@link Metric<Distribution>} objects. */
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/** Static assertThat({@link Metric<Distribution>}) shortcut method. */
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public static DistributionMetricSubject assertThat(@Nullable Metric<Distribution> metric) {
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return assertAbout(DistributionMetricSubject::new).that(metric);
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}
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private DistributionMetricSubject(FailureMetadata metadata, Metric<Distribution> actual) {
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super(metadata, actual);
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}
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/**
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* Returns an indication to {@link AbstractMetricSubject#hasNoOtherValues} on whether a {@link
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* MetricPoint} has a non-empty distribution.
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*/
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@Override
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protected boolean hasDefaultValue(MetricPoint<Distribution> metricPoint) {
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return metricPoint.value().count() == 0;
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}
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/** Returns an appropriate string representation of a metric value for use in error messages. */
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@Override
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protected String getMessageRepresentation(Distribution distribution) {
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StringBuilder sb = new StringBuilder("{");
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boolean first = true;
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for (Map.Entry<Range<Double>, Long> entry :
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distribution.intervalCounts().asMapOfRanges().entrySet()) {
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if (entry.getValue() != 0L) {
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if (first) {
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first = false;
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} else {
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sb.append(',');
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}
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if (entry.getKey().hasLowerBound()) {
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sb.append((entry.getKey().lowerBoundType() == BoundType.CLOSED) ? '[' : '(');
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sb.append(entry.getKey().lowerEndpoint());
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}
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sb.append("..");
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if (entry.getKey().hasUpperBound()) {
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sb.append(entry.getKey().upperEndpoint());
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sb.append((entry.getKey().upperBoundType() == BoundType.CLOSED) ? ']' : ')');
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}
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sb.append('=');
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sb.append(entry.getValue());
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}
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}
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sb.append('}');
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return sb.toString();
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}
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}
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