MessageToMessageDecoderTest Class — netty Architecture

Source Code

codec-base/src/test/java/io/netty/handler/codec/MessageToMessageDecoderTest.java lines 30–64

public class MessageToMessageDecoderTest {

    @Test
    void testReadIfNotAutoReadWhenNotSharable() {
        ReadCountHandler readCountHandler = new ReadCountHandler();
        EmbeddedChannel channel = new EmbeddedChannel(new MessageToMessageDecoder<String>() {
            private int count;
            @Override
            protected void decode(ChannelHandlerContext ctx, String msg, List<Object> out)  {
                if (count++ == 0) {
                    return;
                }
                out.add(msg);
            }
        });
        channel.config().setAutoRead(false);
        channel.pipeline().addFirst(readCountHandler);
        assertFalse(channel.writeInbound("something"));
        assertEquals(1, readCountHandler.readCount.get());
        assertTrue(channel.writeInbound("something"));
        // As we produced a message in the MessageToMessageDecoder we don't expect that there will be any extra
        // read happen.
        assertEquals(1, readCountHandler.readCount.get());
        assertTrue(channel.finishAndReleaseAll());
    }

    private static final class ReadCountHandler extends ChannelOutboundHandlerAdapter {
        final AtomicInteger readCount = new AtomicInteger();
        @Override
        public void read(ChannelHandlerContext ctx) throws Exception {
            readCount.incrementAndGet();
            super.read(ctx);
        }
    }
}