MessageToMessageEncoderTest Class — netty Architecture

Source Code

codec-base/src/test/java/io/netty/handler/codec/MessageToMessageEncoderTest.java lines 33–86

public class MessageToMessageEncoderTest {

    /**
     * Test-case for https://github.com/netty/netty/issues/1656
     */
    @Test
    public void testException() {
        final EmbeddedChannel channel = new EmbeddedChannel(new MessageToMessageEncoder<Object>() {
            @Override
            protected void encode(ChannelHandlerContext ctx, Object msg, List<Object> out) throws Exception {
                throw new Exception();
            }
        });
        assertThrows(EncoderException.class, new Executable() {
            @Override
            public void execute() {
                channel.writeOutbound(new Object());
            }
        });
    }

    @Test
    public void testIntermediateWriteFailures() {
        ChannelHandler encoder = new MessageToMessageEncoder<Object>() {
            @Override
            protected void encode(ChannelHandlerContext ctx, Object msg, List<Object> out) {
                out.add(new Object());
                out.add(msg);
            }
        };

        final Exception firstWriteException = new Exception();

        ChannelHandler writeThrower = new ChannelOutboundHandlerAdapter() {
            private boolean firstWritten;
            @Override
            public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) {
                if (firstWritten) {
                    ctx.write(msg, promise);
                } else {
                    firstWritten = true;
                    promise.setFailure(firstWriteException);
                }
            }
        };

        EmbeddedChannel channel = new EmbeddedChannel(writeThrower, encoder);
        Object msg = new Object();
        ChannelFuture write = channel.writeAndFlush(msg);
        assertSame(firstWriteException, write.cause());
        assertSame(msg, channel.readOutbound());
        assertFalse(channel.finish());
    }
}