• RxJava四个基础接口


    Publisher

    Subscriber

    Subscription

    Processor

    -----------------------------------

    public interface Publisher<T> {
    
        /**
         * Request {@link Publisher} to start streaming data.
         * <p>
         * This is a "factory method" and can be called multiple times, each time starting a new {@link Subscription}.
         * <p>
         * Each {@link Subscription} will work for only a single {@link Subscriber}.
         * <p>
         * A {@link Subscriber} should only subscribe once to a single {@link Publisher}.
         * <p>
         * If the {@link Publisher} rejects the subscription attempt or otherwise fails it will
         * signal the error via {@link Subscriber#onError}.
         *
         * @param s the {@link Subscriber} that will consume signals from this {@link Publisher}
         */
        public void subscribe(Subscriber<? super T> s);
    }
    public interface Subscriber<T> {
        /**
         * Invoked after calling {@link Publisher#subscribe(Subscriber)}.
         * <p>
         * No data will start flowing until {@link Subscription#request(long)} is invoked.
         * <p>
         * It is the responsibility of this {@link Subscriber} instance to call {@link Subscription#request(long)} whenever more data is wanted.
         * <p>
         * The {@link Publisher} will send notifications only in response to {@link Subscription#request(long)}.
         * 
         * @param s
         *            {@link Subscription} that allows requesting data via {@link Subscription#request(long)}
         */
        public void onSubscribe(Subscription s);
    
        /**
         * Data notification sent by the {@link Publisher} in response to requests to {@link Subscription#request(long)}.
         * 
         * @param t the element signaled
         */
        public void onNext(T t);
    
        /**
         * Failed terminal state.
         * <p>
         * No further events will be sent even if {@link Subscription#request(long)} is invoked again.
         *
         * @param t the throwable signaled
         */
        public void onError(Throwable t);
    
        /**
         * Successful terminal state.
         * <p>
         * No further events will be sent even if {@link Subscription#request(long)} is invoked again.
         */
        public void onComplete();
    }
    public interface Subscription {
        /**
         * No events will be sent by a {@link Publisher} until demand is signaled via this method.
         * <p>
         * It can be called however often and whenever needed—but the outstanding cumulative demand must never exceed Long.MAX_VALUE.
         * An outstanding cumulative demand of Long.MAX_VALUE may be treated by the {@link Publisher} as "effectively unbounded".
         * <p>
         * Whatever has been requested can be sent by the {@link Publisher} so only signal demand for what can be safely handled.
         * <p>
         * A {@link Publisher} can send less than is requested if the stream ends but
         * then must emit either {@link Subscriber#onError(Throwable)} or {@link Subscriber#onComplete()}.
         * 
         * @param n the strictly positive number of elements to requests to the upstream {@link Publisher}
         */
        public void request(long n);
    
        /**
         * Request the {@link Publisher} to stop sending data and clean up resources.
         * <p>
         * Data may still be sent to meet previously signalled demand after calling cancel as this request is asynchronous.
         */
        public void cancel();
    }
    public interface Processor<T, R> extends Subscriber<T>, Publisher<R> {
    }
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  • 原文地址:https://www.cnblogs.com/ssqhan/p/8302094.html
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