/* * Copyright 2017, 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.trace.unsafe; import io.grpc.Context; import io.opencensus.trace.Span; /*>>> import org.checkerframework.checker.nullness.qual.Nullable; */ /** * Util methods/functionality to interact with the {@link io.grpc.Context}. * * <p>Users must interact with the current Context via the public APIs in {@link * io.opencensus.trace.Tracer} and avoid usages of the {@link #CONTEXT_SPAN_KEY} directly. * * @since 0.5 */ public final class ContextUtils { // No instance of this class. private ContextUtils() {} /** * The {@link io.grpc.Context.Key} used to interact with {@link io.grpc.Context}. * * @since 0.5 */ public static final Context.Key</*@Nullable*/ Span> CONTEXT_SPAN_KEY = Context.key("opencensus-trace-span-key"); }