| /* |
| * ==================================================================== |
| * 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.http.examples; |
| |
| import java.io.IOException; |
| import java.util.concurrent.Future; |
| |
| import org.apache.http.ConnectionReuseStrategy; |
| import org.apache.http.HttpClientConnection; |
| import org.apache.http.HttpException; |
| import org.apache.http.HttpHost; |
| import org.apache.http.HttpRequestInterceptor; |
| import org.apache.http.HttpResponse; |
| import org.apache.http.HttpVersion; |
| import org.apache.http.impl.DefaultConnectionReuseStrategy; |
| import org.apache.http.impl.pool.BasicConnFactory; |
| import org.apache.http.impl.pool.BasicConnPool; |
| import org.apache.http.impl.pool.BasicPoolEntry; |
| import org.apache.http.message.BasicHttpRequest; |
| import org.apache.http.params.HttpParams; |
| import org.apache.http.params.HttpProtocolParams; |
| import org.apache.http.params.SyncBasicHttpParams; |
| import org.apache.http.protocol.BasicHttpContext; |
| import org.apache.http.protocol.ExecutionContext; |
| import org.apache.http.protocol.HttpContext; |
| import org.apache.http.protocol.HttpProcessor; |
| import org.apache.http.protocol.HttpRequestExecutor; |
| import org.apache.http.protocol.ImmutableHttpProcessor; |
| import org.apache.http.protocol.RequestConnControl; |
| import org.apache.http.protocol.RequestContent; |
| import org.apache.http.protocol.RequestExpectContinue; |
| import org.apache.http.protocol.RequestTargetHost; |
| import org.apache.http.protocol.RequestUserAgent; |
| import org.apache.http.util.EntityUtils; |
| |
| /** |
| * Elemental example for executing multiple GET requests from different threads using a connection |
| * pool. |
| * <p> |
| * Please note the purpose of this application is demonstrate the usage of HttpCore APIs. |
| * It is NOT intended to demonstrate the most efficient way of building an HTTP client. |
| */ |
| public class ElementalPoolingHttpGet { |
| |
| public static void main(String[] args) throws Exception { |
| |
| final HttpParams params = new SyncBasicHttpParams(); |
| HttpProtocolParams.setVersion(params, HttpVersion.HTTP_1_1); |
| HttpProtocolParams.setContentCharset(params, "UTF-8"); |
| HttpProtocolParams.setUserAgent(params, "Test/1.1"); |
| HttpProtocolParams.setUseExpectContinue(params, true); |
| |
| final HttpProcessor httpproc = new ImmutableHttpProcessor(new HttpRequestInterceptor[] { |
| // Required protocol interceptors |
| new RequestContent(), |
| new RequestTargetHost(), |
| // Recommended protocol interceptors |
| new RequestConnControl(), |
| new RequestUserAgent(), |
| new RequestExpectContinue()}); |
| |
| final HttpRequestExecutor httpexecutor = new HttpRequestExecutor(); |
| |
| final BasicConnPool pool = new BasicConnPool(new BasicConnFactory(params)); |
| pool.setDefaultMaxPerRoute(2); |
| pool.setMaxTotal(2); |
| |
| HttpHost[] targets = { |
| new HttpHost("www.google.com", 80), |
| new HttpHost("www.yahoo.com", 80), |
| new HttpHost("www.apache.com", 80) |
| }; |
| |
| class WorkerThread extends Thread { |
| |
| private final HttpHost target; |
| |
| WorkerThread(final HttpHost target) { |
| super(); |
| this.target = target; |
| } |
| |
| @Override |
| public void run() { |
| try { |
| Future<BasicPoolEntry> future = pool.lease(this.target, null); |
| |
| boolean reusable = false; |
| BasicPoolEntry entry = future.get(); |
| try { |
| HttpClientConnection conn = entry.getConnection(); |
| HttpContext context = new BasicHttpContext(null); |
| context.setAttribute(ExecutionContext.HTTP_CONNECTION, conn); |
| context.setAttribute(ExecutionContext.HTTP_TARGET_HOST, this.target); |
| |
| BasicHttpRequest request = new BasicHttpRequest("GET", "/"); |
| System.out.println(">> Request URI: " + request.getRequestLine().getUri()); |
| |
| request.setParams(params); |
| httpexecutor.preProcess(request, httpproc, context); |
| HttpResponse response = httpexecutor.execute(request, conn, context); |
| response.setParams(params); |
| httpexecutor.postProcess(response, httpproc, context); |
| |
| System.out.println("<< Response: " + response.getStatusLine()); |
| System.out.println(EntityUtils.toString(response.getEntity())); |
| |
| ConnectionReuseStrategy connStrategy = new DefaultConnectionReuseStrategy(); |
| reusable = connStrategy.keepAlive(response, context); |
| } catch (IOException ex) { |
| throw ex; |
| } catch (HttpException ex) { |
| throw ex; |
| } finally { |
| if (reusable) { |
| System.out.println("Connection kept alive..."); |
| } |
| pool.release(entry, reusable); |
| } |
| } catch (Exception ex) { |
| System.out.println("Request to " + this.target + " failed: " + ex.getMessage()); |
| } |
| } |
| |
| }; |
| |
| WorkerThread[] workers = new WorkerThread[targets.length]; |
| for (int i = 0; i < workers.length; i++) { |
| workers[i] = new WorkerThread(targets[i]); |
| } |
| for (int i = 0; i < workers.length; i++) { |
| workers[i].start(); |
| } |
| for (int i = 0; i < workers.length; i++) { |
| workers[i].join(); |
| } |
| } |
| |
| } |