我正在从 netty 3 迁移到 netty 4。我有一个管道处理程序,充当经典过滤器,拦截/处理途中不合规的消息,并将合规消息铲到上游。
根据文档 ( http://netty.io/wiki/new-and-noteworthy.html ),我预计使用 ctx.fireInboundBufferUpdated()
代替ctx.sendUpStream()
中继入站。但是,我发现这不起作用,但是 ChannelHandlerUtil.addToNextInboundBuffer()
做。我希望获得一些指导:
- 我对当前文档的断言
ctx.sendUpstream -> ctx.fireInboundBufferUpdated
感到困惑并且, - 这种情况下的最佳实践是什么(如果与我在下面所做的不同)。
代码:
//The pipeline
public class ServerInitializer extends ChannelInitializer<SocketChannel> {
@Override
public void initChannel(SocketChannel ch) throws Exception {
ChannelPipeline p = ch.pipeline();
p.addLast("decoder", new HttpRequestDecoder());
p.addLast("encoder", new HttpResponseEncoder());
p.addLast("inbound", InboundHttpRequestFilter.INSTANCE);
p.addLast("handler", handlerClass.newInstance());
}
}
//The filter
public class InboundHttpRequestFilter extends
ChannelInboundMessageHandlerAdapter<Object> {
@Override
public void messageReceived(ChannelHandlerContext ctx, Object msg)
throws Exception {
... discard/handle as necessary …;
//ctx.fireInboundBufferUpdated(); - doesn't propagate upstream
ChannelHandlerUtil.addToNextInboundBuffer(ctx, msg); // sends upstream
}
}
最佳答案
试试这个:
ctx.nextInboundMessageBuffer().add(msg)
Javadoc:
Interface ChannelHandlerContext
MessageBuf<Object> nextInboundMessageBuffer()
Return the MessageBuf of the next ChannelInboundMessageHandler in the pipeline.
Netty 4 多个处理程序示例:
MultiHandlerServer.java
import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.codec.LineBasedFrameDecoder;
import io.netty.handler.codec.string.StringDecoder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.nio.charset.Charset;
public class MultiHandlerServer {
private static final Logger logger = LoggerFactory.getLogger(MultiHandlerServer.class);
final int port;
public MultiHandlerServer(final int port) {
this.port = port;
}
public void run() throws InterruptedException {
final NioEventLoopGroup bossGroup = new NioEventLoopGroup();
final NioEventLoopGroup workerGroup = new NioEventLoopGroup();
try {
final ServerBootstrap serverBootstrap = new ServerBootstrap()
.group(bossGroup, workerGroup)
.channel(NioServerSocketChannel.class)
.childHandler(new ChannelInitializer<SocketChannel>() {
@Override
protected void initChannel(SocketChannel ch) throws Exception {
ch.pipeline().addLast(
new LineBasedFrameDecoder(8192),
new StringDecoder(Charset.forName("UTF-8")),
new MultiHandler01(), new MultiHandler02());
}
});
final ChannelFuture future = serverBootstrap.bind(port).sync();
future.channel().closeFuture().sync();
} finally {
bossGroup.shutdownGracefully();
workerGroup.shutdownGracefully();
}
}
public static void main(String[] args) throws InterruptedException {
final MultiHandlerServer client = new MultiHandlerServer(8080);
client.run();
}
}
MultiHandler01.java
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundMessageHandlerAdapter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
*/
class MultiHandler01 extends ChannelInboundMessageHandlerAdapter<String> {
private Logger logger = LoggerFactory.getLogger(MultiHandler01.class);
MultiHandler01() {
}
@Override
public void messageReceived(ChannelHandlerContext ctx, String msg) throws Exception {
logger.info(String.format("Handler01 receive message: %s", msg));
ctx.nextInboundMessageBuffer().add(msg);
ctx.fireInboundBufferUpdated();
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
logger.error("Exception caught: %s", ctx.channel().remoteAddress(), cause);
ctx.close();
}
}
MultiHandler02.java
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundMessageHandlerAdapter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
*/
class MultiHandler02 extends ChannelInboundMessageHandlerAdapter<String> {
private Logger logger = LoggerFactory.getLogger(MultiHandler02.class);
MultiHandler02() {
}
@Override
public void messageReceived(ChannelHandlerContext ctx, String msg) throws Exception {
logger.info(String.format("Handler02 receive message: %s", msg));
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
logger.error("Exception caught: %s", ctx.channel().remoteAddress(), cause);
ctx.close();
}
}
关于java - 在 Netty 4 中迁移 sendUpstream,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/16469072/