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rxjava3-flowable developed by David Karnok

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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.flowable;

import io.reactivex.common.annotations.*;

/**
 * Interface to compose ParallelFlowable.
 *
 * @param  the upstream value type
 * @param  the downstream value type
 * 
 * @since 2.0.8 - experimental
 */
@Experimental
public interface ParallelTransformer {
    /**
     * Applies a function to the upstream ParallelFlowable and returns a ParallelFlowable with
     * optionally different element type.
     * @param upstream the upstream ParallelFlowable instance
     * @return the transformed ParallelFlowable instance
     */
    @NonNull
    ParallelFlowable apply(@NonNull ParallelFlowable upstream);
}