/* * Copyright 2017-2020 The OpenTracing 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.opentracing.contrib.grpc; import io.grpc.Context; import io.opentracing.Span; import io.opentracing.SpanContext; /** * A {@link io.grpc.Context} key for the current OpenTracing trace state. * * <p>Can be used to get the active span, or to set the active span for a scoped unit of work. See * the <a href="../../../../../../README.rst">grpc-java OpenTracing docs</a> for use cases and * examples. */ public class OpenTracingContextKey { public static final String KEY_NAME = "io.opentracing.active-span"; public static final String KEY_CONTEXT_NAME = "io.opentracing.active-span-context"; private static final Context.Key<Span> key = Context.key(KEY_NAME); private static final Context.Key<SpanContext> keyContext = Context.key(KEY_CONTEXT_NAME); /** * Retrieves the active span. * * @return the active span for the current request */ public static Span activeSpan() { return key.get(); } /** * Retrieves the span key. * * @return the OpenTracing context key */ public static Context.Key<Span> getKey() { return key; } /** * Retrieves the span context key. * * @return the OpenTracing context key for span context */ public static Context.Key<SpanContext> getSpanContextKey() { return keyContext; } public static SpanContext activeSpanContext() { return keyContext.get(); } }