242.8. 自定义管道
自定义频道管道通过插入自定义处理程序、编码器和解码器，而无需以非常简单的方式在 Netty Endpoint URL 中指定它们，从而对用户提供完全的控制。
要添加自定义管道，必须通过上下文 registry (JNDIRegistry 或 camel-spring ApplicationContextRegistry 等)创建并注册自定义频道管道工厂。
自定义管道工厂必须构建如下
-
Producer 链接的频道管道工厂必须扩展 abstract 类
ClientPipelineFactory。 -
消费者链接的频道管道工厂必须扩展抽象类
ServerInitializerFactory。 -
类应覆盖 initChannel （）方法，以插入自定义处理程序、编码器和解码器。不覆盖
initChannel（） 方法创建没有处理程序、编码器或解码器到管道的管道。
以下示例显示如何创建 ServerInitializerFactory 工厂
242.8.1. 使用自定义管道工厂
import io.netty.channel.Channel;
import io.netty.channel.ChannelPipeline;
import io.netty.handler.codec.DelimiterBasedFrameDecoder;
import io.netty.handler.codec.Delimiters;
import io.netty.handler.codec.string.StringDecoder;
import io.netty.handler.codec.string.StringEncoder;
import io.netty.util.CharsetUtil;
import org.apache.camel.component.netty4.NettyConsumer;
import org.apache.camel.component.netty4.ServerInitializerFactory;
import org.apache.camel.component.netty4.handlers.ServerChannelHandler;
public class SampleServerInitializerFactory extends ServerInitializerFactory {
private int maxLineSize = 1024;
NettyConsumer consumer;
public SampleServerInitializerFactory(NettyConsumer consumer) {
this.consumer = consumer;
}
@Override
public ServerInitializerFactory createPipelineFactory(NettyConsumer consumer) {
return new SampleServerInitializerFactory(consumer);
}
@Override
protected void initChannel(Channel channel) throws Exception {
ChannelPipeline channelPipeline = channel.pipeline();
channelPipeline.addLast("encoder-SD", new StringEncoder(CharsetUtil.UTF_8));
channelPipeline.addLast("decoder-DELIM", new DelimiterBasedFrameDecoder(maxLineSize, true, Delimiters.lineDelimiter()));
channelPipeline.addLast("decoder-SD", new StringDecoder(CharsetUtil.UTF_8));
// here we add the default Camel ServerChannelHandler for the consumer, to allow Camel to route the message etc.
channelPipeline.addLast("handler", new ServerChannelHandler(consumer));
}
}然后，自定义频道管道工厂可以添加到 registry 中，并使用以下方法在 camel 路由上实例化/使用
Registry registry = camelContext.getRegistry();
ServerInitializerFactory factory = new TestServerInitializerFactory(nettyConsumer);
registry.bind("spf", factory);
context.addRoutes(new RouteBuilder() {
public void configure() {
String netty_ssl_endpoint =
"netty4:tcp://0.0.0.0:5150?serverInitializerFactory=#spf"
String return_string =
"When You Go Home, Tell Them Of Us And Say,"
+ "For Your Tomorrow, We Gave Our Today.";
from(netty_ssl_endpoint)
.process(new Processor() {
public void process(Exchange exchange) throws Exception {
exchange.getOut().setBody(return_string);
}
}
}
});