Today, I came across a more realistic requirement for an advertising network, as follows:
An ad server typically receives a large number of requests to load ads from a publisher's app. At this point, the data from these requests can be sent to some intermediate exchanges, which then return the ad data. Since the volume of requests is high and latency must be kept low, it's necessary to use a long connection when communicating with these intermediaries. Creating a new HTTP connection for each request is not feasible.
In practice, the general approach to building a server using Netty is as follows:
1. Create an `EventLoopGroup` to manage NIO I/O events.
2. Create a `NioSocketChannel`, register it with the `EventLoopGroup`, and do not set an initializer handler at this stage.
3. Call the `connect()` method on the channel to initiate a connection with the remote server.
4. Once the connection is established, the previously mentioned initializer handler will be triggered, adding HTTP decoder and encoder handlers to the pipeline.
5. Finally, you can start the HTTP communication.
Of course, the channel should not be closed actively. Disconnection should be handled by the other server, or due to timeout, or any other reason. In this scenario, the client will never close the connection on its own.
In fact, once the above steps are in place, it's quite straightforward to implement an HTTP client using Netty that relies on a long connection. Here's the code:
```java
package fjs;
import java.net.InetSocketAddress;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicLong;
import io.netty.channel.Channel;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandler;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.codec.http.FullHttpRequest;
import io.netty.handler.codec.http.HttpClientCodec;
import io.netty.handler.codec.http.HttpMethod;
import io.netty.handler.codec.http.HttpVersion;
import io.netty.handler.codec.http.QueryStringEncoder;
import io.netty.handler.codec.http.DefaultFullHttpRequest;
public class Fjs {
public static AtomicInteger number = new AtomicInteger(0);
public static AtomicLong time = new AtomicLong(0);
public static void doIt(Channel channel) {
if (number.get() < 50) {
number.incrementAndGet();
time.set(System.currentTimeMillis());
QueryStringEncoder encoder = new QueryStringEncoder("http://Ad.jsp?pub=923875870&adspace=65826983&adcount=1&response=HTML&devip=22.56.22.66&user=900&format=IMG&position=top&height=&width=&device=Mozilla%2F5.0%20%28Linux%3B%20Android%204.2.1%3B%20en-us%3B%20Nexus%204%20Build%2FJOP40D%29%20AppleWebKit%2F535.19%20%28KHTML%2C%20like%20Gecko%29%20Chrome%2F18.0.1025.166%20Mobile%20Safari%2F535.19&beacon=TRUE&phpsnip=104");
URI uriGet = null;
try {
uriGet = new URI(encoder.toString());
} catch (URISyntaxException e) {
System.out.println("I wipe,,,,");
}
FullHttpRequest request = new DefaultFullHttpRequest(HttpVersion.HTTP_1_1, HttpMethod.GET, uriGet.toASCIIString());
channel.pipeline().write(request);
channel.flush();
} else {
System.out.println("over");
}
}
public static void main(String args[]) throws InterruptedException {
NioEventLoopGroup group = new NioEventLoopGroup();
NioSocketChannel channel = new NioSocketChannel(); // Create a channel to initiate the connection
channel.pipeline().addFirst(new InitHandler()); // Add an initialization handler
group.register(channel); // Register the channel
channel.connect(new InetSocketAddress("", 80)); // Initiate the connection
Thread.currentThread().sleep(Long.MAX_VALUE);
}
public static class InitHandler implements ChannelInboundHandler {
@Override
public void handlerAdded(ChannelHandlerContext ctx) throws Exception {
// Not implemented
}
@Override
public void handlerRemoved(ChannelHandlerContext ctx) throws Exception {
// Not implemented
}
@Override
public void channelRegistered(ChannelHandlerContext ctx) throws Exception {
// Not implemented
}
@Override
public void channelUnregistered(ChannelHandlerContext ctx) throws Exception {
// Not implemented
}
}
}
```
This example demonstrates how to build a basic HTTP client using Netty that maintains a persistent connection, allowing efficient handling of multiple ad requests without the overhead of establishing a new connection for each one. The `InitHandler` is used to add the necessary HTTP codec handlers after the connection is established.
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