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CompletableSource.java
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CompletableSource.java
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/*
* Copyright © 2018-2019 Apple Inc. and the ServiceTalk project authors
*
* 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.servicetalk.concurrent;
/**
* An asynchronous computation that does not emit any data. It just completes or emits an error.
*/
@FunctionalInterface
public interface CompletableSource {
/**
* Subscribes to the outcome of this {@code CompletableSource}.
*
* @param subscriber of the outcome.
* @see PublisherSource#subscribe(PublisherSource.Subscriber)
*/
void subscribe(Subscriber subscriber);
/**
* Subscriber of the outcome of a {@link Cancellable}.
* <p>
* The semantics and threading model of this interface is meant to be the same as
* {@link PublisherSource.Subscriber}, but simplified for the use case where the operations completes or fails with
* no data.
*/
interface Subscriber {
/**
* Called when the associated {@link CompletableSource} is subscribed via
* {@link CompletableSource#subscribe(Subscriber)}.
* @param cancellable A {@link Cancellable} that can be used to cancel the asynchronous computation for
* this subscriber.
*/
void onSubscribe(Cancellable cancellable);
/**
* Success terminal state.
* <p>
* No further events will be sent.
*/
void onComplete();
/**
* Failed terminal state.
* <p>
* No further events will be sent.
*
* @param t the throwable signaled
*/
void onError(Throwable t);
}
/**
* A {@link Processor} represents a processing stage that is both a {@link CompletableSource} and a
* {@link Subscriber} and obeys the contracts of both.
*/
interface Processor extends CompletableSource, Subscriber {
}
}