Examples of io.undertow.server.HttpServerExchange$WriteDispatchChannel

io.undertow.server.HttpServerExchange
Channel implementation that is actually provided to clients of the exchange.
We do not provide the underlying conduit channel, as this is shared between requests, so we need to make sure that after this request is done the the channel cannot affect the next request.
It also delays a wakeup/resumesWrites calls until the current call stack has returned, thus ensuring that only 1 thread is active in the exchange at any one time.

    }


    public void newRequest() {
        state.reset();
        read = 0;
        httpServerExchange = new HttpServerExchange(connection, maxEntitySize);
    }

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                    IoUtils.safeClose(connection);
                    return;
                }
            } while (!state.isComplete());


            final HttpServerExchange httpServerExchange = this.httpServerExchange;
            httpServerExchange.setRequestScheme(connection.getSslSession() != null ? "https" : "http");
            this.httpServerExchange = null;
            requestStateUpdater.set(this, 1);
            HttpTransferEncoding.setupRequest(httpServerExchange);
            if (recordRequestStartTime) {
                Connectors.setRequestStartTime(httpServerExchange);

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            throw UndertowServletMessages.MESSAGES.asyncRequestAlreadyDispatched();
        }


        HttpServletRequestImpl requestImpl = servletRequestContext.getOriginalRequest();
        HttpServletResponseImpl responseImpl = servletRequestContext.getOriginalResponse();
        final HttpServerExchange exchange = requestImpl.getExchange();


        exchange.getAttachment(ServletRequestContext.ATTACHMENT_KEY).setDispatcherType(DispatcherType.ASYNC);


        requestImpl.setAttribute(ASYNC_REQUEST_URI, requestImpl.getOriginalRequestURI());
        requestImpl.setAttribute(ASYNC_CONTEXT_PATH, requestImpl.getOriginalContextPath());
        requestImpl.setAttribute(ASYNC_SERVLET_PATH, requestImpl.getOriginalServletPath());
        requestImpl.setAttribute(ASYNC_QUERY_STRING, requestImpl.getOriginalQueryString());

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    public HttpServerExchange sendOutOfBandResponse(HttpServerExchange exchange) {
        if (exchange == null || !HttpContinue.requiresContinueResponse(exchange)) {
            throw UndertowMessages.MESSAGES.outOfBandResponseOnlyAllowedFor100Continue();
        }
        final ConduitState state = resetChannel();
        HttpServerExchange newExchange = new HttpServerExchange(this);
        for (HttpString header : exchange.getRequestHeaders().getHeaderNames()) {
            newExchange.getRequestHeaders().putAll(header, exchange.getRequestHeaders().get(header));
        }
        newExchange.setProtocol(exchange.getProtocol());
        newExchange.setRequestMethod(exchange.getRequestMethod());
        exchange.setRequestURI(exchange.getRequestURI(), exchange.isHostIncludedInRequestURI());
        exchange.setRequestPath(exchange.getRequestPath());
        exchange.setRelativePath(exchange.getRelativePath());
        newExchange.getRequestHeaders().put(Headers.CONNECTION, Headers.KEEP_ALIVE.toString());
        newExchange.getRequestHeaders().put(Headers.CONTENT_LENGTH, 0);
        newExchange.setPersistent(true);


        Connectors.terminateRequest(newExchange);
        newExchange.addResponseWrapper(new ConduitWrapper<StreamSinkConduit>() {
            @Override
            public StreamSinkConduit wrap(ConduitFactory<StreamSinkConduit> factory, HttpServerExchange exchange) {


                ServerFixedLengthStreamSinkConduit fixed = new ServerFixedLengthStreamSinkConduit(new HttpResponseConduit(getSinkChannel().getConduit(), getBufferPool(), exchange), false, false);
                fixed.reset(0, exchange);
                return fixed;
            }
        });


        //we restore the read channel immediately, as this out of band response has no read side
        channel.getSourceChannel().setConduit(source(state));
        newExchange.addExchangeCompleteListener(new ExchangeCompletionListener() {
            @Override
            public void exchangeEvent(HttpServerExchange exchange, NextListener nextListener) {
                restoreChannel(state);
            }
        });

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    public static ContinueResponseSender createResponseSender(final HttpServerExchange exchange) {
        if (!exchange.isResponseChannelAvailable()) {
            throw UndertowMessages.MESSAGES.responseChannelAlreadyProvided();
        }


        HttpServerExchange newExchange = exchange.getConnection().sendOutOfBandResponse(exchange);
        newExchange.setResponseCode(100);
        newExchange.getResponseHeaders().put(Headers.CONTENT_LENGTH, 0);
        final StreamSinkChannel responseChannel = newExchange.getResponseChannel();
        return new ContinueResponseSender() {
            boolean shutdown = false;


            @Override
            public boolean send() throws IOException {

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     */
    public static void sendContinueResponseBlocking(final HttpServerExchange exchange) throws IOException {
        if (!exchange.isResponseChannelAvailable()) {
            throw UndertowMessages.MESSAGES.responseChannelAlreadyProvided();
        }
        HttpServerExchange newExchange = exchange.getConnection().sendOutOfBandResponse(exchange);
        newExchange.setResponseCode(100);
        newExchange.getResponseHeaders().put(Headers.CONTENT_LENGTH, 0);
        newExchange.startBlocking();
        newExchange.getOutputStream().close();
        newExchange.getInputStream().close();
    }

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        exchange.endExchange();
    }




    private static void internalSendContinueResponse(final HttpServerExchange exchange, final IoCallback callback) {
        HttpServerExchange newExchange = exchange.getConnection().sendOutOfBandResponse(exchange);
        newExchange.setResponseCode(100);
        newExchange.getResponseHeaders().put(Headers.CONTENT_LENGTH, 0);
        final StreamSinkChannel responseChannel = newExchange.getResponseChannel();
        try {
            responseChannel.shutdownWrites();
            if (!responseChannel.flush()) {
                exchange.dispatch();
                responseChannel.getWriteSetter().set(ChannelListeners.flushingChannelListener(

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            this.exchange = exchange;
        }


        @Override
        public void completed(final ClientExchange result) {
            HttpServerExchange exchange = result.getAttachment(EXCHANGE);
            final ClientResponse response = result.getResponse();
            final HeaderMap inboundResponseHeaders = response.getResponseHeaders();
            final HeaderMap outboundResponseHeaders = exchange.getResponseHeaders();
            exchange.setResponseCode(response.getResponseCode());
            copyHeaders(outboundResponseHeaders, inboundResponseHeaders);


            if (exchange.isUpgrade()) {
                exchange.upgradeChannel(new HttpUpgradeListener() {
                    @Override
                    public void handleUpgrade(StreamConnection streamConnection, HttpServerExchange exchange) {
                        StreamConnection clientChannel = null;
                        try {
                            clientChannel = result.getConnection().performUpgrade();


                            ChannelListeners.initiateTransfer(Long.MAX_VALUE, clientChannel.getSourceChannel(), streamConnection.getSinkChannel(), ChannelListeners.closingChannelListener(), ChannelListeners.<StreamSinkChannel>writeShutdownChannelListener(ChannelListeners.<StreamSinkChannel>flushingChannelListener(ChannelListeners.closingChannelListener(), ChannelListeners.closingChannelExceptionHandler()), ChannelListeners.closingChannelExceptionHandler()), ChannelListeners.closingChannelExceptionHandler(), ChannelListeners.closingChannelExceptionHandler(), result.getConnection().getBufferPool());
                            ChannelListeners.initiateTransfer(Long.MAX_VALUE, streamConnection.getSourceChannel(), clientChannel.getSinkChannel(), ChannelListeners.closingChannelListener(), ChannelListeners.<StreamSinkChannel>writeShutdownChannelListener(ChannelListeners.<StreamSinkChannel>flushingChannelListener(ChannelListeners.closingChannelListener(), ChannelListeners.closingChannelExceptionHandler()), ChannelListeners.closingChannelExceptionHandler()), ChannelListeners.closingChannelExceptionHandler(), ChannelListeners.closingChannelExceptionHandler(), result.getConnection().getBufferPool());


                        } catch (IOException e) {
                            IoUtils.safeClose(streamConnection, clientChannel);
                        }
                    }
                });
            }
            IoExceptionHandler handler = new IoExceptionHandler(exchange, result.getConnection());
            ChannelListeners.initiateTransfer(Long.MAX_VALUE, result.getResponseChannel(), exchange.getResponseChannel(), ChannelListeners.closingChannelListener(), new HTTPTrailerChannelListener(result, exchange), handler, handler, exchange.getConnection().getBufferPool());


        }

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    }


    public void startRequest() {
        connection.resetChannel();
        state = new AjpRequestParseState();
        httpServerExchange = new HttpServerExchange(connection, maxEntitySize);
        read = 0;
    }

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            // we remove ourselves as the read listener from the channel;
            // if the http handler doesn't set any then reads will suspend, which is the right thing to do
            channel.getReadSetter().set(null);
            channel.suspendReads();


            final HttpServerExchange httpServerExchange = this.httpServerExchange;
            final AjpServerResponseConduit responseConduit = new AjpServerResponseConduit(connection.getChannel().getSinkChannel().getConduit(), connection.getBufferPool(), httpServerExchange, new ConduitListener<AjpServerResponseConduit>() {
                @Override
                public void handleEvent(AjpServerResponseConduit channel) {
                    Connectors.terminateResponse(httpServerExchange);
                }
            }, httpServerExchange.getRequestMethod().equals(Methods.HEAD));
            connection.getChannel().getSinkChannel().setConduit(responseConduit);
            connection.getChannel().getSourceChannel().setConduit(createSourceConduit(connection.getChannel().getSourceChannel().getConduit(), responseConduit, httpServerExchange));
            //we need to set the write ready handler. This allows the response conduit to wrap it
            responseConduit.setWriteReadyHandler(writeReadyHandler);


            try {
                connection.setSSLSessionInfo(state.createSslSessionInfo());
                httpServerExchange.setSourceAddress(state.createPeerAddress());
                httpServerExchange.setDestinationAddress(state.createDestinationAddress());
                if(scheme != null) {
                    httpServerExchange.setRequestScheme(scheme);
                }
                state = null;
                this.httpServerExchange = null;
                httpServerExchange.setPersistent(true);


                if(recordRequestStartTime) {
                    Connectors.setRequestStartTime(httpServerExchange);
                }
                connection.setCurrentExchange(httpServerExchange);

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io.undertow.ajp.AjpReadListener

io.undertow.ajp.AjpServerConnection

io.undertow.conduits.EmptyStreamSourceConduit

io.undertow.conduits.FixedLengthStreamSourceConduit

io.undertow.io.AsyncSenderImpl

io.undertow.io.BlockingSenderImpl

io.undertow.io.UndertowInputStream

io.undertow.io.UndertowOutputStream

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