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* ====================================================================
* 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/>.
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*/
package org.apache.http.examples.nio.client;
import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.concurrent.FutureCallback;
import org.apache.http.impl.nio.client.CloseableHttpAsyncClient;
import org.apache.http.impl.nio.client.HttpAsyncClients;
import org.apache.http.nio.IOControl;
import org.apache.http.nio.client.methods.AsyncCharConsumer;
import org.apache.http.nio.client.methods.HttpAsyncMethods;
import org.apache.http.nio.protocol.HttpAsyncRequestProducer;
import org.apache.http.protocol.HttpContext;
import java.io.IOException;
import java.nio.CharBuffer;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.Future;
public class QuickStart {
public static void main(String[] args) throws Exception {
CloseableHttpAsyncClient httpclient = HttpAsyncClients.createDefault();
try {
// Start the client
httpclient.start();
// Execute request
final HttpGet request1 = new HttpGet("http://www.apache.org/");
Future<HttpResponse> future = httpclient.execute(request1, null);
// and wait until response is received
HttpResponse response1 = future.get();
System.out.println(request1.getRequestLine() + "->" + response1.getStatusLine());
// One most likely would want to use a callback for operation result
final CountDownLatch latch1 = new CountDownLatch(1);
final HttpGet request2 = new HttpGet("http://www.apache.org/");
httpclient.execute(request2, new FutureCallback<HttpResponse>() {
public void completed(final HttpResponse response2) {
latch1.countDown();
System.out.println(request2.getRequestLine() + "->" + response2.getStatusLine());
}
public void failed(final Exception ex) {
latch1.countDown();
System.out.println(request2.getRequestLine() + "->" + ex);
}
public void cancelled() {
latch1.countDown();
System.out.println(request2.getRequestLine() + " cancelled");
}
});
latch1.await();
// In real world one most likely would want also want to stream
// request and response body content
final CountDownLatch latch2 = new CountDownLatch(1);
final HttpGet request3 = new HttpGet("http://www.apache.org/");
HttpAsyncRequestProducer producer3 = HttpAsyncMethods.create(request3);
AsyncCharConsumer<HttpResponse> consumer3 = new AsyncCharConsumer<HttpResponse>() {
HttpResponse response;
@Override
protected void onResponseReceived(final HttpResponse response) {
this.response = response;
}
@Override
protected void onCharReceived(final CharBuffer buf, final IOControl ioctrl) throws IOException {
// Do something useful
}
@Override
protected void releaseResources() {
}
@Override
protected HttpResponse buildResult(final HttpContext context) {
return this.response;
}
};
httpclient.execute(producer3, consumer3, new FutureCallback<HttpResponse>() {
public void completed(final HttpResponse response3) {
latch2.countDown();
System.out.println(request2.getRequestLine() + "->" + response3.getStatusLine());
}
public void failed(final Exception ex) {
latch2.countDown();
System.out.println(request2.getRequestLine() + "->" + ex);
}
public void cancelled() {
latch2.countDown();
System.out.println(request2.getRequestLine() + " cancelled");
}
});
latch2.await();
} finally {
httpclient.close();
}
}
}