| /* |
| * Copyright 2022 Google LLC |
| * |
| * 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 com.google.android.libraries.mobiledatadownload.tracing; |
| |
| import com.google.common.base.Function; |
| import com.google.common.util.concurrent.AsyncCallable; |
| import com.google.common.util.concurrent.AsyncFunction; |
| import com.google.common.util.concurrent.ClosingFuture.ClosingFunction; |
| import com.google.common.util.concurrent.FutureCallback; |
| import com.google.errorprone.annotations.CheckReturnValue; |
| import java.util.concurrent.Callable; |
| |
| /** |
| * Contains decorators for propagating the current trace into a callback. When the wrapped callback |
| * runs, it will run under the same trace the wrapper was created in. |
| */ |
| @CheckReturnValue |
| public final class TracePropagation { |
| |
| @CheckReturnValue |
| public static <V> AsyncCallable<V> propagateAsyncCallable(final AsyncCallable<V> asyncCallable) { |
| return asyncCallable; |
| } |
| |
| @CheckReturnValue |
| public static <I, O> AsyncFunction<I, O> propagateAsyncFunction( |
| final AsyncFunction<I, O> function) { |
| return function; |
| } |
| |
| @CheckReturnValue |
| public static <V> Callable<V> propagateCallable(final Callable<V> callable) { |
| return callable; |
| } |
| |
| @CheckReturnValue |
| public static <I, O> Function<I, O> propagateFunction(final Function<I, O> function) { |
| return function; |
| } |
| |
| @CheckReturnValue |
| public static <T> FutureCallback<T> propagateFutureCallback(final FutureCallback<T> callback) { |
| return callback; |
| } |
| |
| public static <I, O> ClosingFunction<I, O> propagateClosingFunction( |
| final ClosingFunction<I, O> closingFunction) { |
| return closingFunction; |
| } |
| |
| private TracePropagation() {} |
| } |