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/*
 * Copyright 2002-2014 the original author or 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 org.springframework.http.client;

import java.io.IOException;
import java.net.URI;
import java.util.concurrent.Future;

import org.apache.http.HttpEntity;
import org.apache.http.HttpEntityEnclosingRequest;
import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpUriRequest;
import org.apache.http.concurrent.FutureCallback;
import org.apache.http.nio.client.HttpAsyncClient;
import org.apache.http.nio.entity.NByteArrayEntity;
import org.apache.http.protocol.HttpContext;

import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpMethod;
import org.springframework.util.concurrent.FutureAdapter;
import org.springframework.util.concurrent.ListenableFuture;
import org.springframework.util.concurrent.ListenableFutureCallback;
import org.springframework.util.concurrent.ListenableFutureCallbackRegistry;

/**
 * {@link ClientHttpRequest} implementation that uses Apache HttpComponents HttpClient to
 * execute requests.
 *
 * 

Created via the {@link org.springframework.http.client.HttpComponentsClientHttpRequestFactory}. * * @author Oleg Kalnichevski * @author Arjen Poutsma * @since 4.0 * @see org.springframework.http.client.HttpComponentsClientHttpRequestFactory#createRequest */ final class HttpComponentsAsyncClientHttpRequest extends AbstractBufferingAsyncClientHttpRequest { private final HttpAsyncClient httpClient; private final HttpUriRequest httpRequest; private final HttpContext httpContext; HttpComponentsAsyncClientHttpRequest(HttpAsyncClient httpClient, HttpUriRequest httpRequest, HttpContext httpContext) { this.httpClient = httpClient; this.httpRequest = httpRequest; this.httpContext = httpContext; } @Override public HttpMethod getMethod() { return HttpMethod.valueOf(this.httpRequest.getMethod()); } @Override public URI getURI() { return this.httpRequest.getURI(); } @Override protected ListenableFuture executeInternal(HttpHeaders headers, byte[] bufferedOutput) throws IOException { HttpComponentsClientHttpRequest.addHeaders(this.httpRequest, headers); if (this.httpRequest instanceof HttpEntityEnclosingRequest) { HttpEntityEnclosingRequest entityEnclosingRequest = (HttpEntityEnclosingRequest) this.httpRequest; HttpEntity requestEntity = new NByteArrayEntity(bufferedOutput); entityEnclosingRequest.setEntity(requestEntity); } final HttpResponseFutureCallback callback = new HttpResponseFutureCallback(); final Future futureResponse = this.httpClient.execute(this.httpRequest, this.httpContext, callback); return new ClientHttpResponseFuture(futureResponse, callback); } private static class HttpResponseFutureCallback implements FutureCallback { private final ListenableFutureCallbackRegistry callbacks = new ListenableFutureCallbackRegistry(); public void addCallback(ListenableFutureCallback callback) { this.callbacks.addCallback(callback); } @Override public void completed(HttpResponse result) { this.callbacks.success(new HttpComponentsAsyncClientHttpResponse(result)); } @Override public void failed(Exception ex) { this.callbacks.failure(ex); } @Override public void cancelled() { } } private static class ClientHttpResponseFuture extends FutureAdapter implements ListenableFuture { private final HttpResponseFutureCallback callback; public ClientHttpResponseFuture(Future futureResponse, HttpResponseFutureCallback callback) { super(futureResponse); this.callback = callback; } @Override protected ClientHttpResponse adapt(HttpResponse response) { return new HttpComponentsAsyncClientHttpResponse(response); } @Override public void addCallback(ListenableFutureCallback callback) { this.callback.addCallback(callback); } } }





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