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/*
 * Copyright 2017-2022 original 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
 *
 * https://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.micronaut.http.client.netty;

import io.netty.util.concurrent.Promise;
import org.reactivestreams.Subscriber;
import org.reactivestreams.Subscription;

/**
 * {@link Subscriber} implementation that writes into a netty {@link Promise} on completion.
 *
 * @since 3.5.0
 * @author yawkat
 * @param  The message type
 */
final class NettyPromiseSubscriber implements Subscriber {
    private final Promise promise;
    private T value;

    NettyPromiseSubscriber(Promise promise) {
        this.promise = promise;
    }

    @Override
    public void onSubscribe(Subscription s) {
        s.request(Long.MAX_VALUE);
    }

    @Override
    public void onNext(T t) {
        this.value = t;
    }

    @Override
    public void onError(Throwable t) {
        promise.tryFailure(t);
    }

    @Override
    public void onComplete() {
        promise.trySuccess(value);
    }
}