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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.metrics.export.ExportComponent;
/**
* Class that holds the implementation instance for {@link ExportComponent}.
*
* @since 0.17
*/
@ExperimentalApi
public abstract class MetricsComponent {
/**
* Returns the {@link ExportComponent} with the provided implementation. If no implementation is
* provided then no-op implementations will be used.
*
* @return the {@link ExportComponent} implementation.
* @since 0.17
*/
public abstract ExportComponent getExportComponent();
/**
* Returns the {@link MetricRegistry} with the provided implementation.
*
* @return the {@link MetricRegistry} implementation.
* @since 0.17
*/
public abstract MetricRegistry getMetricRegistry();
/**
* Returns an instance that contains no-op implementations for all the instances.
*
* @return an instance that contains no-op implementations for all the instances.
*/
static MetricsComponent newNoopMetricsComponent() {
return new NoopMetricsComponent();
}
private static final class NoopMetricsComponent extends MetricsComponent {
private static final ExportComponent EXPORT_COMPONENT =
ExportComponent.newNoopExportComponent();
private static final MetricRegistry METRIC_REGISTRY = MetricRegistry.newNoopMetricRegistry();
@Override
public ExportComponent getExportComponent() {
return EXPORT_COMPONENT;
}
@Override
public MetricRegistry getMetricRegistry() {
return METRIC_REGISTRY;
}
}
}
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