| /* |
| * ==================================================================== |
| * 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.client5.http.examples.fluent; |
| |
| import java.util.LinkedList; |
| import java.util.Queue; |
| import java.util.concurrent.ExecutionException; |
| import java.util.concurrent.ExecutorService; |
| import java.util.concurrent.Executors; |
| import java.util.concurrent.Future; |
| |
| import org.apache.hc.client5.http.fluent.Async; |
| import org.apache.hc.client5.http.fluent.Content; |
| import org.apache.hc.client5.http.fluent.Request; |
| import org.apache.hc.core5.concurrent.FutureCallback; |
| |
| /** |
| * This example demonstrates how the he HttpClient fluent API can be used to execute multiple |
| * requests asynchronously using background threads. |
| */ |
| public class FluentAsync { |
| |
| public static void main(final String... args)throws Exception { |
| // Use pool of two threads |
| final ExecutorService threadpool = Executors.newFixedThreadPool(2); |
| final Async async = Async.newInstance().use(threadpool); |
| |
| final Request[] requests = new Request[] { |
| Request.get("http://www.google.com/"), |
| Request.get("http://www.yahoo.com/"), |
| Request.get("http://www.apache.org/"), |
| Request.get("http://www.apple.com/") |
| }; |
| |
| |
| final Queue<Future<Content>> queue = new LinkedList<>(); |
| // Execute requests asynchronously |
| for (final Request request: requests) { |
| final Future<Content> future = async.execute(request, new FutureCallback<Content>() { |
| |
| @Override |
| public void failed(final Exception ex) { |
| System.out.println(ex.getMessage() + ": " + request); |
| } |
| |
| @Override |
| public void completed(final Content content) { |
| System.out.println("Request completed: " + request); |
| } |
| |
| @Override |
| public void cancelled() { |
| } |
| |
| }); |
| queue.add(future); |
| } |
| |
| while(!queue.isEmpty()) { |
| final Future<Content> future = queue.remove(); |
| try { |
| future.get(); |
| } catch (final ExecutionException ex) { |
| } |
| } |
| System.out.println("Done"); |
| threadpool.shutdown(); |
| } |
| |
| } |