| /* |
| * ==================================================================== |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF 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 |
| * |
| * 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. |
| * ==================================================================== |
| * |
| * This software consists of voluntary contributions made by many |
| * individuals on behalf of the Apache Software Foundation. For more |
| * information on the Apache Software Foundation, please see |
| * <http://www.apache.org/>. |
| * |
| */ |
| package org.apache.hc.core5.reactive; |
| |
| import java.io.IOException; |
| import java.nio.ByteBuffer; |
| import java.util.List; |
| import java.util.concurrent.atomic.AtomicReference; |
| |
| import org.apache.hc.core5.function.Callback; |
| import org.apache.hc.core5.http.EntityDetails; |
| import org.apache.hc.core5.http.Header; |
| import org.apache.hc.core5.http.HttpException; |
| import org.apache.hc.core5.http.HttpRequest; |
| import org.apache.hc.core5.http.nio.AsyncServerExchangeHandler; |
| import org.apache.hc.core5.http.nio.CapacityChannel; |
| import org.apache.hc.core5.http.nio.DataStreamChannel; |
| import org.apache.hc.core5.http.nio.ResponseChannel; |
| import org.apache.hc.core5.http.protocol.HttpContext; |
| import org.reactivestreams.Publisher; |
| |
| /** |
| * An implementation of {@link AsyncServerExchangeHandler} designed to work with reactive streams. |
| * |
| * @since 5.0 |
| */ |
| public final class ReactiveServerExchangeHandler implements AsyncServerExchangeHandler { |
| |
| private final ReactiveRequestProcessor requestProcessor; |
| private final AtomicReference<ReactiveDataProducer> responseProducer = new AtomicReference<>(null); |
| private final ReactiveDataConsumer requestConsumer; |
| private volatile DataStreamChannel channel; |
| |
| /** |
| * Creates a {@code ReactiveServerExchangeHandler}. |
| * |
| * @param requestProcessor the {@link ReactiveRequestProcessor} instance to |
| * invoke when the request is ready to be handled. |
| */ |
| public ReactiveServerExchangeHandler(final ReactiveRequestProcessor requestProcessor) { |
| this.requestProcessor = requestProcessor; |
| this.requestConsumer = new ReactiveDataConsumer(); |
| } |
| |
| @Override |
| public void handleRequest( |
| final HttpRequest request, |
| final EntityDetails entityDetails, |
| final ResponseChannel responseChannel, |
| final HttpContext context |
| ) throws HttpException, IOException { |
| final Callback<Publisher<ByteBuffer>> callback = result -> { |
| final ReactiveDataProducer producer = new ReactiveDataProducer(result); |
| if (channel != null) { |
| producer.setChannel(channel); |
| } |
| responseProducer.set(producer); |
| result.subscribe(producer); |
| }; |
| requestProcessor.processRequest(request, entityDetails, responseChannel, context, requestConsumer, callback); |
| } |
| |
| @Override |
| public void failed(final Exception cause) { |
| requestConsumer.failed(cause); |
| final ReactiveDataProducer p = responseProducer.get(); |
| if (p != null) { |
| p.onError(cause); |
| } |
| } |
| |
| @Override |
| public void updateCapacity(final CapacityChannel capacityChannel) throws IOException { |
| requestConsumer.updateCapacity(capacityChannel); |
| } |
| |
| @Override |
| public void consume(final ByteBuffer src) throws IOException { |
| requestConsumer.consume(src); |
| } |
| |
| @Override |
| public void streamEnd(final List<? extends Header> trailers) throws HttpException, IOException { |
| requestConsumer.streamEnd(trailers); |
| } |
| |
| @Override |
| public int available() { |
| final ReactiveDataProducer p = responseProducer.get(); |
| if (p == null) { |
| return 0; |
| } else { |
| return p.available(); |
| } |
| } |
| |
| @Override |
| public void produce(final DataStreamChannel channel) throws IOException { |
| this.channel = channel; |
| final ReactiveDataProducer p = responseProducer.get(); |
| if (p != null) { |
| p.produce(channel); |
| } |
| } |
| |
| @Override |
| public void releaseResources() { |
| final ReactiveDataProducer p = responseProducer.get(); |
| if (p != null) { |
| p.releaseResources(); |
| } |
| requestConsumer.releaseResources(); |
| } |
| } |