| /* |
| * ==================================================================== |
| * 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.http.nio.support; |
| |
| 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.HeaderElements; |
| import org.apache.hc.core5.http.HttpException; |
| import org.apache.hc.core5.http.HttpHeaders; |
| import org.apache.hc.core5.http.HttpRequest; |
| import org.apache.hc.core5.http.HttpStatus; |
| import org.apache.hc.core5.http.message.BasicHttpResponse; |
| import org.apache.hc.core5.http.nio.AsyncResponseProducer; |
| 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.apache.hc.core5.util.Args; |
| |
| /** |
| * {@link AsyncServerExchangeHandler} implementation that adds support |
| * for the Expect-Continue handshake to an existing |
| * {@link AsyncServerExchangeHandler}. |
| * |
| * @since 5.0 |
| */ |
| public class BasicAsyncServerExpectationDecorator implements AsyncServerExchangeHandler { |
| |
| private final AsyncServerExchangeHandler handler; |
| private final Callback<Exception> exceptionCallback; |
| private final AtomicReference<AsyncResponseProducer> responseProducerRef; |
| |
| public BasicAsyncServerExpectationDecorator(final AsyncServerExchangeHandler handler, |
| final Callback<Exception> exceptionCallback) { |
| this.handler = Args.notNull(handler, "Handler"); |
| this.exceptionCallback = exceptionCallback; |
| this.responseProducerRef = new AtomicReference<>(null); |
| } |
| |
| public BasicAsyncServerExpectationDecorator(final AsyncServerExchangeHandler handler) { |
| this(handler, null); |
| } |
| |
| protected AsyncResponseProducer verify( |
| final HttpRequest request, |
| final HttpContext context) throws IOException, HttpException { |
| return null; |
| } |
| |
| @Override |
| public final void handleRequest( |
| final HttpRequest request, |
| final EntityDetails entityDetails, |
| final ResponseChannel responseChannel, |
| final HttpContext context) throws HttpException, IOException { |
| if (entityDetails != null) { |
| final Header h = request.getFirstHeader(HttpHeaders.EXPECT); |
| if (h != null && HeaderElements.CONTINUE.equalsIgnoreCase(h.getValue())) { |
| final AsyncResponseProducer producer = verify(request, context); |
| if (producer != null) { |
| responseProducerRef.set(producer); |
| producer.sendResponse(responseChannel, context); |
| return; |
| } |
| responseChannel.sendInformation(new BasicHttpResponse(HttpStatus.SC_CONTINUE), context); |
| } |
| } |
| handler.handleRequest(request, entityDetails, responseChannel, context); |
| } |
| |
| @Override |
| public final void updateCapacity(final CapacityChannel capacityChannel) throws IOException { |
| final AsyncResponseProducer responseProducer = responseProducerRef.get(); |
| if (responseProducer == null) { |
| handler.updateCapacity(capacityChannel); |
| } else { |
| capacityChannel.update(Integer.MAX_VALUE); |
| } |
| } |
| |
| @Override |
| public final void consume(final ByteBuffer src) throws IOException { |
| final AsyncResponseProducer responseProducer = responseProducerRef.get(); |
| if (responseProducer == null) { |
| handler.consume(src); |
| } |
| } |
| |
| @Override |
| public final void streamEnd(final List<? extends Header> trailers) throws HttpException, IOException { |
| final AsyncResponseProducer responseProducer = responseProducerRef.get(); |
| if (responseProducer == null) { |
| handler.streamEnd(trailers); |
| } |
| } |
| |
| @Override |
| public final int available() { |
| final AsyncResponseProducer responseProducer = responseProducerRef.get(); |
| return responseProducer == null ? handler.available() : responseProducer.available(); |
| } |
| |
| @Override |
| public final void produce(final DataStreamChannel channel) throws IOException { |
| final AsyncResponseProducer responseProducer = responseProducerRef.get(); |
| if (responseProducer == null) { |
| handler.produce(channel); |
| } else { |
| responseProducer.produce(channel); |
| } |
| } |
| |
| @Override |
| public final void failed(final Exception cause) { |
| if (exceptionCallback != null) { |
| exceptionCallback.execute(cause); |
| } |
| final AsyncResponseProducer dataProducer = responseProducerRef.get(); |
| if (dataProducer == null) { |
| handler.failed(cause); |
| } else { |
| dataProducer.failed(cause); |
| } |
| } |
| |
| @Override |
| public final void releaseResources() { |
| handler.releaseResources(); |
| final AsyncResponseProducer dataProducer = responseProducerRef.getAndSet(null); |
| if (dataProducer != null) { |
| dataProducer.releaseResources(); |
| } |
| } |
| |
| } |