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POUsing Netty 4, how do I write a handler that can inject messages on a periodic basis and still pass messages through?
 

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  1. POUsing Netty 4, how do I write a handler that can inject messages on a periodic basis and still pass messages through?
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    <p>I am trying to write a class that injects a message into a channel every minute. I have figured out how to accomplish this using the code below, but I think my flush method is wrong. After flushing upstream messages, I am noticing the socket gets immediately closed.</p> <pre><code>public class Pinger extends ChannelOutboundMessageHandlerAdapter&lt;ByteBuf&gt; { private static final ByteBuf DUMMY = Unpooled.wrappedBuffer("DUMMY".getBytes()); @Override public void connect(ChannelHandlerContext ctx, SocketAddress remoteAddress, SocketAddress localAddress, ChannelPromise promise) throws Exception{ super.connect(ctx, remoteAddress, localAddress, promise); ctx.executor().scheduleAtFixedRate(new RepeatTask(ctx), 0, 60, TimeUnit.SECONDS); } private final class RepeatTask implements Runnable { private final ChannelHandlerContext ctx; public RepeatTask(ChannelHandlerContext ctx){ this.ctx = ctx; } public void run() { if(ctx.channel().isActive()){ ctx.write(DUMMY.copy()); } } } @Override public void flush(ChannelHandlerContext ctx, ByteBuf msg) throws Exception { ctx.nextOutboundMessageBuffer().add(msg); ctx.flush(); } } </code></pre> <p>I would to also note that this handler is in the middle of a complex pipeline.</p>
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