io.opentelemetry.sdk.metrics.internal.state.SynchronousMetricStorage Maven / Gradle / Ivy
/*
* Copyright The OpenTelemetry Authors
* SPDX-License-Identifier: Apache-2.0
*/
package io.opentelemetry.sdk.metrics.internal.state;
import io.opentelemetry.sdk.metrics.View;
import io.opentelemetry.sdk.metrics.data.ExemplarData;
import io.opentelemetry.sdk.metrics.data.MetricData;
import io.opentelemetry.sdk.metrics.data.PointData;
import io.opentelemetry.sdk.metrics.internal.aggregator.Aggregator;
import io.opentelemetry.sdk.metrics.internal.aggregator.AggregatorFactory;
import io.opentelemetry.sdk.metrics.internal.descriptor.InstrumentDescriptor;
import io.opentelemetry.sdk.metrics.internal.descriptor.MetricDescriptor;
import io.opentelemetry.sdk.metrics.internal.exemplar.ExemplarFilter;
import io.opentelemetry.sdk.metrics.internal.export.RegisteredReader;
import io.opentelemetry.sdk.metrics.internal.view.RegisteredView;
/**
* Stores aggregated {@link MetricData} for synchronous instruments.
*
* This class is internal and is hence not for public use. Its APIs are unstable and can change
* at any time.
*/
public interface SynchronousMetricStorage extends MetricStorage, WriteableMetricStorage {
/** Returns metric storage which doesn't store or generate any metrics. */
static SynchronousMetricStorage empty() {
return EmptyMetricStorage.INSTANCE;
}
/**
* Constructs metric storage for a given synchronous instrument and view.
*
* @return The storage, or {@link EmptyMetricStorage#empty()} if the instrument should not be
* recorded.
*/
static SynchronousMetricStorage create(
RegisteredReader registeredReader,
RegisteredView registeredView,
InstrumentDescriptor instrumentDescriptor,
ExemplarFilter exemplarFilter) {
View view = registeredView.getView();
MetricDescriptor metricDescriptor =
MetricDescriptor.create(view, registeredView.getViewSourceInfo(), instrumentDescriptor);
Aggregator aggregator =
((AggregatorFactory) view.getAggregation())
.createAggregator(instrumentDescriptor, exemplarFilter);
// We won't be storing this metric.
if (Aggregator.drop() == aggregator) {
return empty();
}
return new DefaultSynchronousMetricStorage<>(
registeredReader,
metricDescriptor,
aggregator,
registeredView.getViewAttributesProcessor());
}
}