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/*
* Copyright (C) 2020 The Android Open Source Project
*
* 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 android.os;
import android.annotation.NonNull;
/**
* Callback interface intended for use when an asynchronous operation may result in a failure.
*
* This interface may be used in cases where an asynchronous API may complete either with a value
* or with a {@link Throwable} that indicates an error.
* @param <R> The type of the result that's being sent.
* @param <E> The type of the {@link Throwable} that contains more information about the error.
*/
public interface OutcomeReceiver<R, E extends Throwable> {
/**
* Called when the asynchronous operation succeeds and delivers a result value.
* @param result The value delivered by the asynchronous operation.
*/
void onResult(@NonNull R result);
/**
* Called when the asynchronous operation fails. The mode of failure is indicated by the
* {@link Throwable} passed as an argument to this method.
* @param error A subclass of {@link Throwable} with more details about the error that occurred.
*/
default void onError(@NonNull E error) {}
}
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