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129 changes: 129 additions & 0 deletions
129
core/src/main/java/com/linecorp/armeria/client/AbstractHttpRequestSubscriber.java
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| /* | ||
| * Copyright 2016 LINE Corporation | ||
| * | ||
| * LINE Corporation licenses this file to you 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: | ||
| * | ||
| * https://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. | ||
| */ | ||
|
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| package com.linecorp.armeria.client; | ||
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| import org.reactivestreams.Subscriber; | ||
| import org.reactivestreams.Subscription; | ||
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| import com.linecorp.armeria.common.HttpData; | ||
| import com.linecorp.armeria.common.HttpObject; | ||
| import com.linecorp.armeria.common.HttpRequest; | ||
| import com.linecorp.armeria.common.RequestHeaders; | ||
| import com.linecorp.armeria.common.SessionProtocol; | ||
| import com.linecorp.armeria.common.annotation.Nullable; | ||
| import com.linecorp.armeria.internal.client.DecodedHttpResponse; | ||
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| import io.netty.channel.Channel; | ||
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| abstract class AbstractHttpRequestSubscriber extends AbstractHttpRequestHandler | ||
| implements Subscriber<HttpObject> { | ||
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| private static final HttpData EMPTY_EOS = HttpData.empty().withEndOfStream(); | ||
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| static AbstractHttpRequestSubscriber of(Channel channel, ClientHttpObjectEncoder requestEncoder, | ||
| HttpResponseDecoder responseDecoder, SessionProtocol protocol, | ||
| ClientRequestContext ctx, HttpRequest req, | ||
| DecodedHttpResponse res, long writeTimeoutMillis, | ||
| boolean webSocket) { | ||
| if (webSocket) { | ||
| if (protocol.isExplicitHttp1()) { | ||
| return new WebSocketHttp1RequestSubscriber( | ||
| channel, requestEncoder, responseDecoder, req, res, ctx, writeTimeoutMillis); | ||
| } | ||
| assert protocol.isExplicitHttp2(); | ||
| return new WebSocketHttp2RequestSubscriber( | ||
| channel, requestEncoder, responseDecoder, req, res, ctx, writeTimeoutMillis); | ||
| } | ||
| return new HttpRequestSubscriber( | ||
| channel, requestEncoder, responseDecoder, req, res, ctx, writeTimeoutMillis); | ||
| } | ||
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| private final HttpRequest request; | ||
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| @Nullable | ||
| private Subscription subscription; | ||
| private boolean isSubscriptionCompleted; | ||
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| AbstractHttpRequestSubscriber(Channel ch, ClientHttpObjectEncoder encoder, | ||
| HttpResponseDecoder responseDecoder, | ||
| HttpRequest request, DecodedHttpResponse originalRes, | ||
| ClientRequestContext ctx, long timeoutMillis, boolean allowTrailers, | ||
| boolean keepAlive) { | ||
| super(ch, encoder, responseDecoder, originalRes, ctx, timeoutMillis, request.isEmpty(), allowTrailers, | ||
| keepAlive); | ||
| this.request = request; | ||
| } | ||
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| @Override | ||
| public void onSubscribe(Subscription subscription) { | ||
| assert this.subscription == null; | ||
| this.subscription = subscription; | ||
| if (state() == State.DONE) { | ||
| cancel(); | ||
| return; | ||
| } | ||
|
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| if (!tryInitialize()) { | ||
| return; | ||
| } | ||
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| // NB: This must be invoked at the end of this method because otherwise the callback methods in this | ||
| // class can be called before the member fields (subscription, id, responseWrapper and | ||
| // timeoutFuture) are initialized. | ||
| // It is because the successful write of the first headers will trigger subscription.request(1). | ||
| writeHeaders(mapHeaders(request.headers())); | ||
| channel().flush(); | ||
| } | ||
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| RequestHeaders mapHeaders(RequestHeaders headers) { | ||
| return headers; | ||
| } | ||
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| @Override | ||
| public void onError(Throwable cause) { | ||
| isSubscriptionCompleted = true; | ||
| failRequest(cause); | ||
| } | ||
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| @Override | ||
| public void onComplete() { | ||
| isSubscriptionCompleted = true; | ||
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| if (state() != State.DONE) { | ||
| writeData(EMPTY_EOS); | ||
| channel().flush(); | ||
| } | ||
| } | ||
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| @Override | ||
| void onWriteSuccess() { | ||
| // Request more messages regardless whether the state is DONE. It makes the producer have | ||
| // a chance to produce the last call such as 'onComplete' and 'onError' when there are | ||
| // no more messages it can produce. | ||
| if (!isSubscriptionCompleted) { | ||
| assert subscription != null; | ||
| subscription.request(1); | ||
| } | ||
| } | ||
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| @Override | ||
| void cancel() { | ||
| isSubscriptionCompleted = true; | ||
| assert subscription != null; | ||
| subscription.cancel(); | ||
| } | ||
| } |
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