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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.metrics;
import io.opencensus.common.ExperimentalApi;
import io.opencensus.common.ToDoubleFunction;
import io.opencensus.common.ToLongFunction;
import io.opencensus.internal.Utils;
import java.util.Collection;
import java.util.Collections;
import java.util.LinkedHashMap;
/**
* Creates and manages your application's set of metrics. Exporters use the metric registry to
* iterate over the set of metrics instrumenting your application, and then further export each
* metric to the backend of choice.
*
* @since 0.16
*/
@ExperimentalApi
public abstract class MetricRegistry extends MetricProducer {
/**
* Build a new long gauge to be added to the registry.
*
* <p>Must be called only once.
*
* @param name the name of the metric.
* @param description the description of the metric.
* @param unit the unit of the metric.
* @param obj the function argument.
* @param function the function to be called.
* @since 0.16 @ExperimentalApi
*/
public abstract <T> void addLongGauge(
String name,
String description,
String unit,
LinkedHashMap<LabelKey, LabelValue> labels,
T obj,
ToLongFunction<T> function);
/**
* Build a new double gauge to be added to the registry.
*
* <p>Must be called only once.
*
* @param name the name of the metric.
* @param description the description of the metric.
* @param unit the unit of the metric.
* @param obj the function argument.
* @param function the function to be called.
* @since 0.16 @ExperimentalApi
*/
public abstract <T> void addDoubleGauge(
String name,
String description,
String unit,
LinkedHashMap<LabelKey, LabelValue> labels,
T obj,
ToDoubleFunction<T> function);
static MetricRegistry newNoopMetricRegistry() {
return new NoopMetricRegistry();
}
private static final class NoopMetricRegistry extends MetricRegistry {
@Override
public <T> void addLongGauge(
String name,
String description,
String unit,
LinkedHashMap<LabelKey, LabelValue> labels,
T obj,
ToLongFunction<T> function) {
Utils.checkNotNull(name, "name");
Utils.checkNotNull(description, "description");
Utils.checkNotNull(unit, "unit");
Utils.checkNotNull(labels, "labels");
Utils.checkNotNull(function, "function");
}
@Override
public <T> void addDoubleGauge(
String name,
String description,
String unit,
LinkedHashMap<LabelKey, LabelValue> labels,
T obj,
ToDoubleFunction<T> function) {
Utils.checkNotNull(name, "name");
Utils.checkNotNull(description, "description");
Utils.checkNotNull(unit, "unit");
Utils.checkNotNull(labels, "labels");
Utils.checkNotNull(function, "function");
}
@Override
public Collection<Metric> getMetrics() {
return Collections.emptyList();
}
}
}
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