我正在编写一个简单的路由应用程序。我的想法是，我有服务器或源节点接收瞬时客户端连接，持续时间为x时间。接收的消息被解码，然后根据消息的细节发送到已经打开的相应的宿节点或客户端。 Router类注册所有通道并尝试将它们保存在映射中，以便它可以过滤并解决消息的目标。一旦我到达目的地，我就应该能够选择实际的汇聚节点（可能具有持续性的瞬态，具体取决于配置），并将数据发送到该频道等待响应，然后将其发送回发起者。我想首先知道我使用netty的实现方向是否正确？如何传递从任何服务器收到的消息并将其发送到任何客户端并响应原始源节点？
以下是我的源代码：它会/应该让您知道我在做什么：请在您的解释中使用代码示例。
import java.net.InetSocketAddress;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.Executors;
import org.jboss.netty.bootstrap.ClientBootstrap;
import org.jboss.netty.bootstrap.ServerBootstrap;
import org.jboss.netty.channel.ChannelFactory;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.jboss.netty.channel.ChannelPipeline;
import org.jboss.netty.channel.ChannelPipelineFactory;
import org.jboss.netty.channel.ChannelStateEvent;
import org.jboss.netty.channel.Channels;
import org.jboss.netty.channel.ChildChannelStateEvent;
import org.jboss.netty.channel.ExceptionEvent;
import org.jboss.netty.channel.MessageEvent;
import org.jboss.netty.channel.SimpleChannelHandler;
import org.jboss.netty.channel.socket.nio.NioClientSocketChannelFactory;
import org.jboss.netty.channel.socket.nio.NioServerSocketChannelFactory;
/*
* @author Kimathi
*/
public class Service {
private Nodes nodes;
public void start(){
nodes = new Nodes();
nodes.addSourceNodes(new SourceNodes()).
addSinkNodes(new SinkNodes()).
addConfigurations(new Configurations()).
boot();
}
public void stop(){
nodes.stop();
}
public static void main(String [] args){
new Service().start();
}
}
class Nodes {
private SourceNodes sourcenodes;
private SinkNodes sinknodes ;
private Configurations configurations;
public Nodes addConfigurations(Configurations configurations){
this.configurations = configurations;
return this;
}
public Nodes addSourceNodes(SourceNodes sourcenodes){
this.sourcenodes = sourcenodes;
return this;
}
public Nodes addSinkNodes(SinkNodes sinknodes){
this.sinknodes = sinknodes;
return this;
}
public void boot(){
Router router = new Router(configurations);
sourcenodes.addPort(8000).
addPort(8001).
addPort(8002);
sourcenodes.addRouter(router);
sourcenodes.boot() ;
sinknodes.addRemoteAddress("127.0.0.1", 6000).
addRemoteAddress("127.0.0.1", 6001).
addRemoteAddress("127.0.0.1", 6002);
sinknodes.addRouter(router);
sinknodes.boot();
}
public void stop(){
sourcenodes.stop();
sinknodes.stop();
}
}
final class SourceNodes implements Bootable , Routable {
private List <Integer> ports = new ArrayList();
private ServerBootstrap serverbootstrap;
private Router router;
@Override
public void addRouter(final Router router){
this.router = router;
}
public SourceNodes addPort(int port){
this.ports.add(port);
return this;
}
@Override
public void boot(){
this.initBootStrap();
this.serverbootstrap.setOption("child.tcpNoDelay", true);
this.serverbootstrap.setOption("child.keepAlive", true);
this.serverbootstrap.setPipelineFactory(new ChannelPipelineFactory() {
@Override
public ChannelPipeline getPipeline() throws Exception {
return Channels.pipeline(new SourceHandler(router));
}
});
for(int port:this.ports){
this.serverbootstrap.bind(new InetSocketAddress(port));
}
}
@Override
public void stop(){
this.serverbootstrap.releaseExternalResources();
}
private void initBootStrap(){
ChannelFactory factory = new NioServerSocketChannelFactory( Executors.newCachedThreadPool(),Executors.newCachedThreadPool());
this.serverbootstrap = new ServerBootstrap(factory);
}
}
final class SinkNodes implements Bootable , Routable {
private List<SinkAddress> addresses= new ArrayList();
private ClientBootstrap clientbootstrap;
private Router router;
@Override
public void addRouter(final Router router){
this.router = router;
}
public SinkNodes addRemoteAddress(String hostAddress,int port){
this.addresses.add(new SinkAddress(hostAddress,port));
return this;
}
@Override
public void boot(){
this.initBootStrap();
this.clientbootstrap.setOption("tcpNoDelay", true);
this.clientbootstrap.setOption("keepAlive", true);
this.clientbootstrap.setPipelineFactory(new ChannelPipelineFactory() {
@Override
public ChannelPipeline getPipeline() throws Exception {
return Channels.pipeline(new SinkHandler(router));
}
});
for(SinkAddress address:this.addresses){
this.clientbootstrap.connect(new InetSocketAddress(address.hostAddress(),address.port()));
}
}
@Override
public void stop(){
this.clientbootstrap.releaseExternalResources();
}
private void initBootStrap(){
ChannelFactory factory = new NioClientSocketChannelFactory( Executors.newCachedThreadPool(),Executors.newCachedThreadPool());
this.clientbootstrap = new ClientBootstrap(factory);
}
private class SinkAddress {
private final String hostAddress;
private final int port;
public SinkAddress(String hostAddress, int port) {
this.hostAddress = hostAddress;
this.port = port;
}
public String hostAddress() { return this.hostAddress; }
public int port() { return this.port; }
}
}
class SourceHandler extends SimpleChannelHandler {
private Router router;
public SourceHandler(Router router){
this.router = router;
}
@Override
public void childChannelOpen(ChannelHandlerContext ctx, ChildChannelStateEvent e) throws Exception {
System.out.println("child is opened");
}
@Override
public void channelClosed(ChannelHandlerContext ctx, ChannelStateEvent e) throws Exception {
System.out.println("child is closed");
}
@Override
public void channelOpen(ChannelHandlerContext ctx, ChannelStateEvent e) throws Exception {
System.out.println("Server is opened");
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, ExceptionEvent e) throws Exception {
System.out.println(e.getCause());
}
@Override
public void messageReceived(ChannelHandlerContext ctx, MessageEvent e) throws Exception {
System.out.println("channel received message");
}
}
class SinkHandler extends SimpleChannelHandler {
private Router router;
public SinkHandler(Router router){
this.router = router;
}
@Override
public void channelConnected(ChannelHandlerContext ctx, ChannelStateEvent e) throws Exception {
System.out.println("Channel is connected");
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, ExceptionEvent e) throws Exception {
System.out.println(e.getCause());
}
@Override
public void messageReceived(ChannelHandlerContext ctx, MessageEvent e) throws Exception {
System.out.println("channel received message");
}
}
final class Router {
private Configurations configurations;
private Map sourcenodes = new HashMap();
private Map Sinknodes = new HashMap();
public Router(){}
public Router(Configurations configurations){
this.configurations = configurations;
}
public synchronized boolean submitSource(ChannelHandlerContext ctx , MessageEvent e){
boolean responded = false;
return responded;
}
public synchronized boolean submitSink(ChannelHandlerContext ctx , MessageEvent e){
boolean responded = false;
return responded;
}
}
final class Configurations {
public Configurations(){}
}
interface Bootable {
public abstract void boot();
public abstract void stop();
}
interface Routable {
public abstract void addRouter(Router router);
}
答案 0 :(得分：0)
这个想法似乎很合理。
源通道处理程序可以使用Channel#write(...)写入相应的接收通道，反之亦然。
当然，您还需要一种方法来将源通道与回复相关联，以及如何最好地完成这取决于协议的性质。如果可能，最好的替代方案是以某种方式将消息中的源信道id编码到接收器信道（当然也在回复中）。
如果不可能，您将以某种方式保持相关性。如果保证答复与发送的请求配对，则每个汇信道的FIFO队列可能是合适的。