/*
 * 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.rxjava3.internal.subscriptions;

import java.util.concurrent.atomic.AtomicInteger;

import io.reactivex.rxjava3.annotations.NonNull;
import io.reactivex.rxjava3.operators.QueueSubscription;

/**
 * Base class extending AtomicInteger (wip or request accounting) and QueueSubscription (fusion).
 *
 * @param <T> the value type
 */
public abstract class BasicIntQueueSubscription<@NonNull T> extends AtomicInteger implements QueueSubscription<T> {

    private static final long serialVersionUID = -6671519529404341862L;

    @Override
    public final boolean offer(T e) {
        throw new UnsupportedOperationException("Should not be called!");
    }

    @Override
    public final boolean offer(T v1, T v2) {
        throw new UnsupportedOperationException("Should not be called!");
    }
}
