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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.implcore.internal.Utils;
import io.opencensus.metrics.DerivedDoubleGauge;
import io.opencensus.metrics.DerivedLongGauge;
import io.opencensus.metrics.DoubleGauge;
import io.opencensus.metrics.LabelKey;
import io.opencensus.metrics.LongGauge;
import io.opencensus.metrics.MetricRegistry;
import io.opencensus.metrics.export.Metric;
import io.opencensus.metrics.export.MetricProducer;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
/** 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 LongGauge addLongGauge(
String name, String description, String unit, List<LabelKey> labelKeys) {
Utils.checkListElementNotNull(
checkNotNull(labelKeys, "labelKeys"), "labelKey element should not be null.");
LongGaugeImpl longGaugeMetric =
new LongGaugeImpl(
checkNotNull(name, "name"),
checkNotNull(description, "description"),
checkNotNull(unit, "unit"),
Collections.unmodifiableList(new ArrayList<LabelKey>(labelKeys)));
registeredMeters.registerMeter(name, longGaugeMetric);
return longGaugeMetric;
}
@Override
public DoubleGauge addDoubleGauge(
String name, String description, String unit, List<LabelKey> labelKeys) {
Utils.checkListElementNotNull(
checkNotNull(labelKeys, "labelKeys"), "labelKey element should not be null.");
DoubleGaugeImpl doubleGaugeMetric =
new DoubleGaugeImpl(
checkNotNull(name, "name"),
checkNotNull(description, "description"),
checkNotNull(unit, "unit"),
Collections.unmodifiableList(new ArrayList<LabelKey>(labelKeys)));
registeredMeters.registerMeter(name, doubleGaugeMetric);
return doubleGaugeMetric;
}
@Override
public DerivedLongGauge addDerivedLongGauge(
String name, String description, String unit, List<LabelKey> labelKeys) {
Utils.checkListElementNotNull(
checkNotNull(labelKeys, "labelKeys"), "labelKey element should not be null.");
DerivedLongGaugeImpl derivedLongGauge =
new DerivedLongGaugeImpl(
checkNotNull(name, "name"),
checkNotNull(description, "description"),
checkNotNull(unit, "unit"),
Collections.unmodifiableList(new ArrayList<LabelKey>(labelKeys)));
registeredMeters.registerMeter(name, derivedLongGauge);
return derivedLongGauge;
}
@Override
public DerivedDoubleGauge addDerivedDoubleGauge(
String name, String description, String unit, List<LabelKey> labelKeys) {
Utils.checkListElementNotNull(
checkNotNull(labelKeys, "labelKeys"), "labelKey element should not be null.");
DerivedDoubleGaugeImpl derivedDoubleGauge =
new DerivedDoubleGaugeImpl(
checkNotNull(name, "name"),
checkNotNull(description, "description"),
checkNotNull(unit, "unit"),
Collections.unmodifiableList(new ArrayList<LabelKey>(labelKeys)));
registeredMeters.registerMeter(name, derivedDoubleGauge);
return derivedDoubleGauge;
}
private static final class RegisteredMeters {
private volatile Map<String, Meter> registeredMeters = Collections.emptyMap();
private Map<String, Meter> getRegisteredMeters() {
return registeredMeters;
}
private synchronized void registerMeter(String meterName, Meter meter) {
Meter existingMeter = registeredMeters.get(meterName);
if (existingMeter != null) {
// TODO(mayurkale): Allow users to register the same Meter multiple times without exception.
throw new IllegalArgumentException(
"A different metric with the same name already registered.");
}
Map<String, Meter> registeredMetersCopy = new LinkedHashMap<String, Meter>(registeredMeters);
registeredMetersCopy.put(meterName, meter);
registeredMeters = Collections.unmodifiableMap(registeredMetersCopy);
}
}
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 meters.
Map<String, Meter> meters = registeredMeters.getRegisteredMeters();
if (meters.isEmpty()) {
return Collections.emptyList();
}
List<Metric> metrics = new ArrayList<Metric>(meters.size());
for (Map.Entry<String, Meter> entry : meters.entrySet()) {
Metric metric = entry.getValue().getMetric(clock);
if (metric != null) {
metrics.add(metric);
}
}
return metrics;
}
}
MetricProducer getMetricProducer() {
return metricProducer;
}
}
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