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/*
* 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;
}
@CheckReturnValue
public static Runnable propagateRunnable(Runnable runnable) {
return runnable;
}
private TracePropagation() {}
}
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