/*
* ====================================================================
* 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.nio;
import java.io.IOException;
import java.io.InterruptedIOException;
import java.util.concurrent.CountDownLatch;
import org.apache.http.HttpHost;
import org.apache.http.HttpRequestInterceptor;
import org.apache.http.HttpResponse;
import org.apache.http.concurrent.FutureCallback;
import org.apache.http.impl.DefaultConnectionReuseStrategy;
import org.apache.http.impl.nio.DefaultHttpClientIODispatch;
import org.apache.http.impl.nio.pool.BasicNIOConnPool;
import org.apache.http.impl.nio.reactor.DefaultConnectingIOReactor;
import org.apache.http.impl.nio.reactor.IOReactorConfig;
import org.apache.http.message.BasicHttpRequest;
import org.apache.http.nio.protocol.BasicAsyncRequestProducer;
import org.apache.http.nio.protocol.BasicAsyncResponseConsumer;
import org.apache.http.nio.protocol.HttpAsyncRequestExecutor;
import org.apache.http.nio.protocol.HttpAsyncRequester;
import org.apache.http.nio.reactor.ConnectingIOReactor;
import org.apache.http.nio.reactor.IOEventDispatch;
import org.apache.http.params.CoreConnectionPNames;
import org.apache.http.params.CoreProtocolPNames;
import org.apache.http.params.HttpParams;
import org.apache.http.params.SyncBasicHttpParams;
import org.apache.http.protocol.BasicHttpContext;
import org.apache.http.protocol.HttpProcessor;
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;
/**
* Asynchronous HTTP/1.1 client.
*/
public class NHttpClient {
public static void main(String[] args) throws Exception {
// HTTP parameters for the client
HttpParams params = new SyncBasicHttpParams();
params
.setIntParameter(CoreConnectionPNames.SO_TIMEOUT, 3000)
.setIntParameter(CoreConnectionPNames.CONNECTION_TIMEOUT, 3000)
.setIntParameter(CoreConnectionPNames.SOCKET_BUFFER_SIZE, 8 * 1024)
.setBooleanParameter(CoreConnectionPNames.TCP_NODELAY, true)
.setParameter(CoreProtocolPNames.USER_AGENT, "Test/1.1");
// Create HTTP protocol processing chain
HttpProcessor httpproc = new ImmutableHttpProcessor(new HttpRequestInterceptor[] {
// Use standard client-side protocol interceptors
new RequestContent(),
new RequestTargetHost(),
new RequestConnControl(),
new RequestUserAgent(),
new RequestExpectContinue()});
// Create client-side HTTP protocol handler
HttpAsyncRequestExecutor protocolHandler = new HttpAsyncRequestExecutor();
// Create client-side I/O event dispatch
final IOEventDispatch ioEventDispatch = new DefaultHttpClientIODispatch(protocolHandler, params);
// Create client-side I/O reactor
IOReactorConfig config = new IOReactorConfig();
config.setIoThreadCount(1);
final ConnectingIOReactor ioReactor = new DefaultConnectingIOReactor(config);
// Create HTTP connection pool
BasicNIOConnPool pool = new BasicNIOConnPool(ioReactor, params);
// Limit total number of connections to just two
pool.setDefaultMaxPerRoute(2);
pool.setMaxTotal(2);
// Run the I/O reactor in a separate thread
Thread t = new Thread(new Runnable() {
public void run() {
try {
// Ready to go!
ioReactor.execute(ioEventDispatch);
} catch (InterruptedIOException ex) {
System.err.println("Interrupted");
} catch (IOException e) {
System.err.println("I/O error: " + e.getMessage());
}
System.out.println("Shutdown");
}
});
// Start the client thread
t.start();
// Create HTTP requester
HttpAsyncRequester requester = new HttpAsyncRequester(
httpproc, new DefaultConnectionReuseStrategy(), params);
// Execute HTTP GETs to the following hosts and
HttpHost[] targets = new HttpHost[] {
new HttpHost("www.apache.org", 80, "http"),
new HttpHost("www.verisign.com", 443, "https"),
new HttpHost("www.google.com", 80, "http")
};
final CountDownLatch latch = new CountDownLatch(targets.length);
for (final HttpHost target: targets) {
BasicHttpRequest request = new BasicHttpRequest("GET", "/");
requester.execute(
new BasicAsyncRequestProducer(target, request),
new BasicAsyncResponseConsumer(),
pool,
new BasicHttpContext(),
// Handle HTTP response from a callback
new FutureCallback<HttpResponse>() {
public void completed(final HttpResponse response) {
latch.countDown();
System.out.println(target + "->" + response.getStatusLine());
}
public void failed(final Exception ex) {
latch.countDown();
System.out.println(target + "->" + ex);
}
public void cancelled() {
latch.countDown();
System.out.println(target + " cancelled");
}
});
}
latch.await();
System.out.println("Shutting down I/O reactor");
ioReactor.shutdown();
System.out.println("Done");
}
}