| /* |
| * 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.internal.DefaultVisibilityForTesting; |
| import io.opencensus.internal.Provider; |
| import io.opencensus.metrics.export.ExportComponent; |
| import java.util.logging.Level; |
| import java.util.logging.Logger; |
| import javax.annotation.Nullable; |
| |
| /** |
| * Class for accessing the default {@link MetricsComponent}. |
| * |
| * @since 0.17 |
| */ |
| @ExperimentalApi |
| public final class Metrics { |
| private static final Logger logger = Logger.getLogger(Metrics.class.getName()); |
| private static final MetricsComponent metricsComponent = |
| loadMetricsComponent(MetricsComponent.class.getClassLoader()); |
| |
| /** |
| * Returns the global {@link ExportComponent}. |
| * |
| * @return the global {@code ExportComponent}. |
| * @since 0.17 |
| */ |
| public static ExportComponent getExportComponent() { |
| return metricsComponent.getExportComponent(); |
| } |
| |
| /** |
| * Returns the global {@link MetricRegistry}. |
| * |
| * <p>This {@code MetricRegistry} is already added to the global {@link |
| * io.opencensus.metrics.export.MetricProducerManager}. |
| * |
| * @return the global {@code MetricRegistry}. |
| * @since 0.17 |
| */ |
| public static MetricRegistry getMetricRegistry() { |
| return metricsComponent.getMetricRegistry(); |
| } |
| |
| // Any provider that may be used for MetricsComponent can be added here. |
| @DefaultVisibilityForTesting |
| static MetricsComponent loadMetricsComponent(@Nullable ClassLoader classLoader) { |
| try { |
| // Call Class.forName with literal string name of the class to help shading tools. |
| return Provider.createInstance( |
| Class.forName( |
| "io.opencensus.impl.metrics.MetricsComponentImpl", /*initialize=*/ true, classLoader), |
| MetricsComponent.class); |
| } catch (ClassNotFoundException e) { |
| logger.log( |
| Level.FINE, |
| "Couldn't load full implementation for MetricsComponent, now trying to load lite " |
| + "implementation.", |
| e); |
| } |
| try { |
| // Call Class.forName with literal string name of the class to help shading tools. |
| return Provider.createInstance( |
| Class.forName( |
| "io.opencensus.impllite.metrics.MetricsComponentImplLite", |
| /*initialize=*/ true, |
| classLoader), |
| MetricsComponent.class); |
| } catch (ClassNotFoundException e) { |
| logger.log( |
| Level.FINE, |
| "Couldn't load lite implementation for MetricsComponent, now using default " |
| + "implementation for MetricsComponent.", |
| e); |
| } |
| return MetricsComponent.newNoopMetricsComponent(); |
| } |
| |
| private Metrics() {} |
| } |