/**
* Copyright (c) 2016-present, RxJava Contributors.
*
* 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.reactivex;
import io.reactivex.annotations.*;
/**
* Convenience interface and callback used by the compose operator to turn a Completable into another
* Completable fluently.
*/
public interface CompletableTransformer {
/**
* Applies a function to the upstream Completable and returns a CompletableSource.
* @param upstream the upstream Completable instance
* @return the transformed CompletableSource instance
*/
@NonNull
CompletableSource apply(@NonNull Completable upstream);
}