| /* |
| * 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"); |
| } |