zipkin2.Callback Maven / Gradle / Ivy
/*
* Copyright 2015-2019 The OpenZipkin 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 zipkin2;
import zipkin2.internal.Nullable;
/**
* A callback of a single result or error.
*
* This is a bridge to async libraries such as CompletableFuture complete, completeExceptionally.
*
*
Implementations will call either {@link #onSuccess} or {@link #onError}, but not both.
*/
public interface Callback {
/**
* Invoked when computation produces its potentially null value successfully.
*
* When this is called, {@link #onError} won't be.
*/
void onSuccess(@Nullable V value);
/**
* Invoked when computation produces a possibly null value successfully.
*
*
When this is called, {@link #onSuccess} won't be.
*/
void onError(Throwable t);
}