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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.export;
import io.opencensus.common.ExperimentalApi;
/**
* Class that holds the implementation instance for {@link MetricProducerManager}.
*
* <p>Unless otherwise noted all methods (on component) results are cacheable.
*
* @since 0.17
*/
@ExperimentalApi
public abstract class ExportComponent {
/**
* Returns the no-op implementation of the {@code ExportComponent}.
*
* @return the no-op implementation of the {@code ExportComponent}.
* @since 0.17
*/
public static ExportComponent newNoopExportComponent() {
return new NoopExportComponent();
}
/**
* Returns the global {@link MetricProducerManager} which can be used to register handlers to
* export all the recorded metrics.
*
* @return the implementation of the {@code MetricExporter} or no-op if no implementation linked
* in the binary.
* @since 0.17
*/
public abstract MetricProducerManager getMetricProducerManager();
private static final class NoopExportComponent extends ExportComponent {
private static final MetricProducerManager METRIC_PRODUCER_MANAGER =
MetricProducerManager.newNoopMetricProducerManager();
@Override
public MetricProducerManager getMetricProducerManager() {
return METRIC_PRODUCER_MANAGER;
}
}
}
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