https://github.com/ReactiveX/RxJava: Reactive Extensions for Java
  • David Karnok 
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.

/**
 * 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 org.reactivestreams.Subscriber;

public interface QueueDrain<T, U> {

    boolean cancelled();

    boolean done();

    Throwable error();

    boolean enter();

    long requested();

    long produced(long n);

    
Adds m to the wip counter.

Params:
  • m – the value to add
Returns:the current value after adding m
/**
     * Adds m to the wip counter.
     * @param m the value to add
     * @return the current value after adding m
     */
    int leave(int m);

    
Accept the value and return true if forwarded.

Params:
  • a – the subscriber
  • v – the value
Returns:true if the value was delivered
/**
     * Accept the value and return true if forwarded.
     * @param a the subscriber
     * @param v the value
     * @return true if the value was delivered
     */
    boolean accept(Subscriber<? super U> a, T v);
}