dev.miku.r2dbc.mysql.util.FluxDiscardOnCancelFuseable Maven / Gradle / Ivy

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/*
 * Copyright 2018-2020 the original author or 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 dev.miku.r2dbc.mysql.util;

import org.reactivestreams.Subscription;
import reactor.core.CoreSubscriber;
import reactor.core.Fuseable;
import reactor.core.publisher.Flux;
import reactor.core.publisher.FluxOperator;
import reactor.util.annotation.Nullable;

/**
 * A decorating operator that replays signals from its source to a {@code CoreSubscriber} and drains the
 * source upon {@link Subscription#cancel() cancel} and drops data signals until termination.
 * Draining data is required to complete a particular request/response window and clear the protocol
 * state as client code expects to start a request/response conversation without any previous
 * response state.
 *
 * @see FluxDiscardOnCancel contains all subscriber implementations for discard on cancel.
 */
final class FluxDiscardOnCancelFuseable extends FluxOperator implements Fuseable {

    @Nullable
    private final Runnable onDone;

    FluxDiscardOnCancelFuseable(Flux source, @Nullable Runnable onDone) {
        super(source);
        this.onDone = onDone;
    }

    @Override
    public void subscribe(CoreSubscriber actual) {
        this.source.subscribe(DiscardOnCancelSubscriber.create(actual, true, onDone));
    }
}