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/*
* Copyright 2018, OpenCensus Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package io.opencensus.implcore.metrics;
import static com.google.common.base.Preconditions.checkNotNull;
import io.opencensus.common.Clock;
import io.opencensus.common.ToDoubleFunction;
import io.opencensus.common.ToLongFunction;
import io.opencensus.implcore.metrics.Gauge.DoubleGauge;
import io.opencensus.implcore.metrics.Gauge.LongGauge;
import io.opencensus.metrics.LabelKey;
import io.opencensus.metrics.LabelValue;
import io.opencensus.metrics.Metric;
import io.opencensus.metrics.MetricProducer;
import io.opencensus.metrics.MetricRegistry;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.LinkedHashSet;
import java.util.Set;
/** Implementation of {@link MetricRegistry}. */
public final class MetricRegistryImpl extends MetricRegistry {
private final RegisteredMeters registeredMeters;
private final MetricProducer metricProducer;
MetricRegistryImpl(Clock clock) {
registeredMeters = new RegisteredMeters();
metricProducer = new MetricProducerForRegistry(registeredMeters, clock);
}
@Override
public <T> void addLongGauge(
String name,
String description,
String unit,
LinkedHashMap<LabelKey, LabelValue> labels,
T obj,
ToLongFunction<T> function) {
checkNotNull(labels, "labels");
registeredMeters.registerMeter(
new LongGauge<T>(
checkNotNull(name, "name"),
checkNotNull(description, "description"),
checkNotNull(unit, "unit"),
Collections.unmodifiableList(new ArrayList<LabelKey>(labels.keySet())),
Collections.unmodifiableList(new ArrayList<LabelValue>(labels.values())),
obj,
checkNotNull(function, "function")));
}
@Override
public <T> void addDoubleGauge(
String name,
String description,
String unit,
LinkedHashMap<LabelKey, LabelValue> labels,
T obj,
ToDoubleFunction<T> function) {
checkNotNull(labels, "labels");
registeredMeters.registerMeter(
new DoubleGauge<T>(
checkNotNull(name, "name"),
checkNotNull(description, "description"),
checkNotNull(unit, "unit"),
Collections.unmodifiableList(new ArrayList<LabelKey>(labels.keySet())),
Collections.unmodifiableList(new ArrayList<LabelValue>(labels.values())),
obj,
checkNotNull(function, "function")));
}
private static final class RegisteredMeters {
private volatile Set<Gauge> registeredGauges = Collections.emptySet();
private Set<Gauge> getRegisteredMeters() {
return registeredGauges;
}
private synchronized void registerMeter(Gauge gauge) {
Set<Gauge> newGaguesList = new LinkedHashSet<Gauge>(registeredGauges);
newGaguesList.add(gauge);
registeredGauges = Collections.unmodifiableSet(newGaguesList);
}
}
private static final class MetricProducerForRegistry extends MetricProducer {
private final RegisteredMeters registeredMeters;
private final Clock clock;
private MetricProducerForRegistry(RegisteredMeters registeredMeters, Clock clock) {
this.registeredMeters = registeredMeters;
this.clock = clock;
}
@Override
public Collection<Metric> getMetrics() {
// Get a snapshot of the current registered gauges.
Set<Gauge> gaguges = registeredMeters.getRegisteredMeters();
if (gaguges.isEmpty()) {
return Collections.emptyList();
}
ArrayList<Metric> metrics = new ArrayList<Metric>();
for (Gauge gauge : gaguges) {
metrics.add(gauge.getMetric(clock));
}
return metrics;
}
}
MetricProducer getMetricProducer() {
return metricProducer;
}
}
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