ReadTimeoutHandler not firing

[Roger Varley]

Hi

I am new to Netty (using 4.0.24-Final) so I am probably missing something vital. I am trying to write a JUnit test to check that I can handle a client that simply dies in mid-transmission. I am simulating this by sending a short message that never completes. I was expecting the ReadTimeoutHandler to fire and the ExceptionHandler would close the connection. However, I can see through debug that the ReadTimeoutHandler never fires and the ExceptionHandler is never called.




This is my unit test

        @Test
        public void ifMessageDataLengthIsLessThanLengthDeclaredThenConnectionIsClosed() {
      
        int MAX_EXPECTED_MESSAGE_LENGTH_IN_BYTES = 20;
        int TIME_OUT_IN_SECS = 4;
        byte[] bytes = new byte[] {0x09, 0x01, 0x02, 0x03, 0x04, 0x05};
       
        EmbeddedChannel channel = new EmbeddedChannel(new ReadTimeoutHandler(TIME_OUT_IN_SECS)
                                        , new LengthFieldBasedFrameDecoder(MAX_EXPECTED_MESSAGE_LENGTH_IN_BYTES,0,1,0,1)
                                        , new ExceptionHandler());
       
        channel.writeInbound(Unpooled.wrappedBuffer(bytes));
       
        assertTrue(channel.isOpen());
       
        sleepForMilliSecs((TIME_OUT_IN_SECS + 2) * 1000);
       
        assertTrue(!channel.isOpen());
    }
   
   
    private void sleepForMilliSecs(int millis) {
        try {
            Thread.sleep(millis);
        } catch (InterruptedException e) {
          
        }
       
    }

and my ExceptionHandler

    public class ExceptionHandler extends ChannelInboundHandlerAdapter {
   
    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
        System.out.println("Exception handler is called with " + cause);
        ctx.close();
    }

}

[Norman Maurer]

That is because the EmbeddedChannel not really support running scheduled tasks by itself as everything is just done in the calling thread. Just call  `runPendingTasks()` after the sleep and it should have the effect you expect.

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[Roger Varley]

Thanks Norman, that worked perfectly.