| /* |
| * ==================================================================== |
| * 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.AtomicBoolean; |
| |
| import org.apache.hc.core5.concurrent.FutureCallback; |
| 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.HttpResponse; |
| import org.apache.hc.core5.http.HttpStatus; |
| import org.apache.hc.core5.http.nio.AsyncClientExchangeHandler; |
| import org.apache.hc.core5.http.nio.AsyncRequestProducer; |
| import org.apache.hc.core5.http.nio.AsyncResponseConsumer; |
| import org.apache.hc.core5.http.nio.CapacityChannel; |
| import org.apache.hc.core5.http.nio.DataStreamChannel; |
| import org.apache.hc.core5.http.nio.RequestChannel; |
| import org.apache.hc.core5.http.protocol.HttpContext; |
| import org.apache.hc.core5.util.Args; |
| |
| /** |
| * Basic {@link AsyncClientExchangeHandler} implementation that makes use |
| * of {@link AsyncRequestProducer} to generate request message |
| * and {@link AsyncResponseConsumer} to process the response message returned by the server. |
| * |
| * @since 5.0 |
| */ |
| public final class BasicClientExchangeHandler<T> implements AsyncClientExchangeHandler { |
| |
| private final AsyncRequestProducer requestProducer; |
| private final AsyncResponseConsumer<T> responseConsumer; |
| private final AtomicBoolean completed; |
| private final FutureCallback<T> resultCallback; |
| private final AtomicBoolean outputTerminated; |
| |
| public BasicClientExchangeHandler( |
| final AsyncRequestProducer requestProducer, |
| final AsyncResponseConsumer<T> responseConsumer, |
| final FutureCallback<T> resultCallback) { |
| this.requestProducer = Args.notNull(requestProducer, "Request producer"); |
| this.responseConsumer = Args.notNull(responseConsumer, "Response consumer"); |
| this.completed = new AtomicBoolean(false); |
| this.resultCallback = resultCallback; |
| this.outputTerminated = new AtomicBoolean(false); |
| } |
| |
| @Override |
| public void produceRequest(final RequestChannel requestChannel, final HttpContext httpContext) throws HttpException, IOException { |
| requestProducer.sendRequest(requestChannel, httpContext); |
| } |
| |
| @Override |
| public int available() { |
| return requestProducer.available(); |
| } |
| |
| @Override |
| public void produce(final DataStreamChannel channel) throws IOException { |
| if (outputTerminated.get()) { |
| channel.endStream(); |
| return; |
| } |
| requestProducer.produce(channel); |
| } |
| |
| @Override |
| public void consumeInformation(final HttpResponse response, final HttpContext httpContext) throws HttpException, IOException { |
| responseConsumer.informationResponse(response, httpContext); |
| } |
| |
| @Override |
| public void consumeResponse(final HttpResponse response, final EntityDetails entityDetails, final HttpContext httpContext) throws HttpException, IOException { |
| if (response.getCode() >= HttpStatus.SC_CLIENT_ERROR) { |
| outputTerminated.set(true); |
| requestProducer.releaseResources(); |
| } |
| responseConsumer.consumeResponse(response, entityDetails, httpContext, new FutureCallback<T>() { |
| |
| @Override |
| public void completed(final T result) { |
| if (completed.compareAndSet(false, true)) { |
| try { |
| if (resultCallback != null) { |
| resultCallback.completed(result); |
| } |
| } finally { |
| internalReleaseResources(); |
| } |
| } |
| } |
| |
| @Override |
| public void failed(final Exception ex) { |
| if (completed.compareAndSet(false, true)) { |
| try { |
| if (resultCallback != null) { |
| resultCallback.failed(ex); |
| } |
| } finally { |
| internalReleaseResources(); |
| } |
| } |
| } |
| |
| @Override |
| public void cancelled() { |
| if (completed.compareAndSet(false, true)) { |
| try { |
| if (resultCallback != null) { |
| resultCallback.cancelled(); |
| } |
| } finally { |
| internalReleaseResources(); |
| } |
| } |
| } |
| |
| }); |
| } |
| |
| @Override |
| public void cancel() { |
| if (completed.compareAndSet(false, true)) { |
| try { |
| if (resultCallback != null) { |
| resultCallback.cancelled(); |
| } |
| } finally { |
| internalReleaseResources(); |
| } |
| } |
| } |
| |
| @Override |
| public void updateCapacity(final CapacityChannel capacityChannel) throws IOException { |
| responseConsumer.updateCapacity(capacityChannel); |
| } |
| |
| @Override |
| public void consume(final ByteBuffer src) throws IOException { |
| responseConsumer.consume(src); |
| } |
| |
| @Override |
| public void streamEnd(final List<? extends Header> trailers) throws HttpException, IOException { |
| responseConsumer.streamEnd(trailers); |
| } |
| |
| @Override |
| public void failed(final Exception cause) { |
| try { |
| requestProducer.failed(cause); |
| responseConsumer.failed(cause); |
| } finally { |
| if (completed.compareAndSet(false, true)) { |
| try { |
| if (resultCallback != null) { |
| resultCallback.failed(cause); |
| } |
| } finally { |
| internalReleaseResources(); |
| } |
| } |
| } |
| } |
| |
| private void internalReleaseResources() { |
| requestProducer.releaseResources(); |
| responseConsumer.releaseResources(); |
| } |
| |
| @Override |
| public void releaseResources() { |
| } |
| |
| } |