Examples of io.netty.channel.ChannelPipeline.replaceAndForward()

io.netty.channel.ChannelPipeline.replaceAndForward()
Replaces the specified {@link ChannelHandler} with a new handler inthis pipeline and transfer the content of its {@link Buf} to the next{@link ChannelHandler} in the {@link ChannelPipeline}. @param oldHandler the {@link ChannelHandler} to be replaced @param newName the name under which the replacement should be added @param newHandler the {@link ChannelHandler} which is used as replacement @return itself @throws NoSuchElementException if the specified old handler does not exist in this pipeline @throws IllegalArgumentException if a handler with the specified new name already exists in this pipeline, except for the handler to be replaced @throws NullPointerException if the specified old handler, new name, or new handler is {@code null}

            ctx = p.context(HttpClientCodec.class);
            if (ctx == null) {
                throw new IllegalStateException("ChannelPipeline does not contain " +
                        "a HttpRequestEncoder or HttpClientCodec");
            }
            p.replaceAndForward(ctx.name(), "ws-decoder", newWebsocketDecoder());
        } else {
            if (p.get(HttpRequestEncoder.class) != null) {
                p.remove(HttpRequestEncoder.class);
            }
            p.replaceAndForward(ctx.name(),

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            p.replaceAndForward(ctx.name(), "ws-decoder", newWebsocketDecoder());
        } else {
            if (p.get(HttpRequestEncoder.class) != null) {
                p.remove(HttpRequestEncoder.class);
            }
            p.replaceAndForward(ctx.name(),
                    "ws-decoder", newWebsocketDecoder());
        }
    }


    /**

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                            promise.setFailure(
                                    new IllegalStateException("No HttpDecoder and no HttpServerCodec in the pipeline"));
                            return;
                        }
                        p.addBefore(ctx.name(), "wsencoder", newWebsocketDecoder());
                        p.replaceAndForward(ctx.name(), "wsdecoder", newWebSocketEncoder());
                    } else {
                        p.replaceAndForward(ctx.name(), "wsdecoder", newWebsocketDecoder());


                        p.replace(HttpResponseEncoder.class, "wsencoder", newWebSocketEncoder());
                    }

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                            return;
                        }
                        p.addBefore(ctx.name(), "wsencoder", newWebsocketDecoder());
                        p.replaceAndForward(ctx.name(), "wsdecoder", newWebSocketEncoder());
                    } else {
                        p.replaceAndForward(ctx.name(), "wsdecoder", newWebsocketDecoder());


                        p.replace(HttpResponseEncoder.class, "wsencoder", newWebSocketEncoder());
                    }
                    promise.setSuccess();
                } else {

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