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/**

* 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 org.reactivestreams.Subscriber;

/**

* Interface to map/wrap a downstream subscriber to an upstream subscriber.

*

* @param <Downstream> the value type of the downstream

* @param <Upstream> the value type of the upstream

*/

public interface FlowableOperator<Downstream, Upstream> {

/**

* Applies a function to the child Subscriber and returns a new parent Subscriber.

* @param observer the child Subscriber instance

* @return the parent Subscriber instance

* @throws Exception on failure

*/

Subscriber<? super Upstream> apply(Subscriber<? super Downstream> observer) throws Exception;

}