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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.metrics.LabelKey;
import io.opencensus.metrics.LabelValue;
import io.opencensus.metrics.Metric;
import io.opencensus.metrics.MetricDescriptor;
import io.opencensus.metrics.MetricDescriptor.Type;
import io.opencensus.metrics.Point;
import io.opencensus.metrics.TimeSeries;
import io.opencensus.metrics.Value;
import java.util.Collections;
import java.util.List;
abstract class Gauge {
private final MetricDescriptor metricDescriptor;
private final List<LabelValue> labelValues;
final Metric getMetric(Clock clock) {
return Metric.create(metricDescriptor, Collections.singletonList(getTimeSeries(clock)));
}
abstract TimeSeries getTimeSeries(Clock clock);
static final class DoubleGauge<T> extends Gauge {
private final T obj;
private final ToDoubleFunction<T> function;
DoubleGauge(
String name,
String description,
String unit,
List<LabelKey> labelKeys,
List<LabelValue> labelValues,
T obj,
ToDoubleFunction<T> function) {
super(
MetricDescriptor.create(name, description, unit, Type.GAUGE_DOUBLE, labelKeys),
labelValues);
this.obj = obj;
this.function = function;
}
@Override
TimeSeries getTimeSeries(Clock clock) {
return TimeSeries.create(
getLabelValues(),
Collections.singletonList(
Point.create(Value.doubleValue(function.applyAsDouble(obj)), clock.now())),
null);
}
}
static final class LongGauge<T> extends Gauge {
private final T obj;
private final ToLongFunction<T> function;
LongGauge(
String name,
String description,
String unit,
List<LabelKey> labelKeys,
List<LabelValue> labelValues,
T obj,
ToLongFunction<T> function) {
super(
MetricDescriptor.create(name, description, unit, Type.GAUGE_INT64, labelKeys),
labelValues);
this.obj = obj;
this.function = function;
}
@Override
TimeSeries getTimeSeries(Clock clock) {
return TimeSeries.create(
getLabelValues(),
Collections.singletonList(
Point.create(Value.longValue(function.applyAsLong(obj)), clock.now())),
null);
}
}
List<LabelValue> getLabelValues() {
return labelValues;
}
Gauge(MetricDescriptor metricDescriptor, List<LabelValue> labelValues) {
this.metricDescriptor = checkNotNull(metricDescriptor, "metricDescriptor");
this.labelValues = Collections.unmodifiableList(labelValues);
}
}
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