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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.internal.util;

import io.reactivex.Observer;

public interface ObservableQueueDrain {

    boolean cancelled();

    boolean done();

    Throwable error();

    boolean enter();

    /**
     * Adds m to the wip counter.
     * @param m the value to add
     * @return the wip value after adding the value
     */
    int leave(int m);

    /**
     * Accept the value and return true if forwarded.
     * @param a the subscriber to deliver values to
     * @param v the value to deliver
     */
    void accept(Observer a, T v);
}




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