| /* |
| * ==================================================================== |
| * 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; |
| |
| import java.util.concurrent.CancellationException; |
| import java.util.concurrent.ExecutorService; |
| import java.util.concurrent.Executors; |
| import java.util.concurrent.FutureTask; |
| import java.util.concurrent.TimeUnit; |
| |
| import org.apache.hc.client5.http.classic.methods.HttpGet; |
| import org.apache.hc.client5.http.impl.classic.CloseableHttpClient; |
| import org.apache.hc.client5.http.impl.classic.FutureRequestExecutionService; |
| import org.apache.hc.client5.http.impl.classic.HttpClientBuilder; |
| import org.apache.hc.client5.http.impl.io.PoolingHttpClientConnectionManagerBuilder; |
| import org.apache.hc.client5.http.io.HttpClientConnectionManager; |
| import org.apache.hc.client5.http.protocol.HttpClientContext; |
| import org.apache.hc.core5.concurrent.FutureCallback; |
| import org.apache.hc.core5.http.HttpStatus; |
| import org.apache.hc.core5.http.io.HttpClientResponseHandler; |
| |
| public class ClientWithRequestFuture { |
| |
| public static void main(final String[] args) throws Exception { |
| // the simplest way to create a HttpAsyncClientWithFuture |
| final HttpClientConnectionManager cm = PoolingHttpClientConnectionManagerBuilder.create() |
| .setMaxConnPerRoute(5) |
| .setMaxConnTotal(5) |
| .build(); |
| final CloseableHttpClient httpclient = HttpClientBuilder.create() |
| .setConnectionManager(cm) |
| .build(); |
| final ExecutorService execService = Executors.newFixedThreadPool(5); |
| try (final FutureRequestExecutionService requestExecService = new FutureRequestExecutionService( |
| httpclient, execService)) { |
| // Because things are asynchronous, you must provide a HttpClientResponseHandler |
| final HttpClientResponseHandler<Boolean> handler = response -> { |
| // simply return true if the status was OK |
| return response.getCode() == HttpStatus.SC_OK; |
| }; |
| |
| // Simple request ... |
| final HttpGet request1 = new HttpGet("http://httpbin.org/get"); |
| final FutureTask<Boolean> futureTask1 = requestExecService.execute(request1, |
| HttpClientContext.create(), handler); |
| final Boolean wasItOk1 = futureTask1.get(); |
| System.out.println("It was ok? " + wasItOk1); |
| |
| // Cancel a request |
| try { |
| final HttpGet request2 = new HttpGet("http://httpbin.org/get"); |
| final FutureTask<Boolean> futureTask2 = requestExecService.execute(request2, |
| HttpClientContext.create(), handler); |
| futureTask2.cancel(true); |
| final Boolean wasItOk2 = futureTask2.get(); |
| System.out.println("It was cancelled so it should never print this: " + wasItOk2); |
| } catch (final CancellationException e) { |
| System.out.println("We cancelled it, so this is expected"); |
| } |
| |
| // Request with a timeout |
| final HttpGet request3 = new HttpGet("http://httpbin.org/get"); |
| final FutureTask<Boolean> futureTask3 = requestExecService.execute(request3, |
| HttpClientContext.create(), handler); |
| final Boolean wasItOk3 = futureTask3.get(10, TimeUnit.SECONDS); |
| System.out.println("It was ok? " + wasItOk3); |
| |
| final FutureCallback<Boolean> callback = new FutureCallback<Boolean>() { |
| @Override |
| public void completed(final Boolean result) { |
| System.out.println("completed with " + result); |
| } |
| |
| @Override |
| public void failed(final Exception ex) { |
| System.out.println("failed with " + ex.getMessage()); |
| } |
| |
| @Override |
| public void cancelled() { |
| System.out.println("cancelled"); |
| } |
| }; |
| |
| // Simple request with a callback |
| final HttpGet request4 = new HttpGet("http://httpbin.org/get"); |
| // using a null HttpContext here since it is optional |
| // the callback will be called when the task completes, fails, or is cancelled |
| final FutureTask<Boolean> futureTask4 = requestExecService.execute(request4, |
| HttpClientContext.create(), handler, callback); |
| final Boolean wasItOk4 = futureTask4.get(10, TimeUnit.SECONDS); |
| System.out.println("It was ok? " + wasItOk4); |
| } |
| } |
| } |