hu.akarnokd.rxjava2.internal.util.NbpQueueDrain Maven / Gradle / Ivy

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/**
 * Copyright 2015 David Karnok and Netflix, Inc.
 * 
 * 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 hu.akarnokd.rxjava2.internal.util;

import hu.akarnokd.rxjava2.NbpObservable.NbpSubscriber;

public interface NbpQueueDrain {
    
    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(NbpSubscriber a, T v);
}