org.springframework.http.server.reactive.UndertowHttpHandlerAdapter.java Source code

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Here is the source code for org.springframework.http.server.reactive.UndertowHttpHandlerAdapter.java

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/*
 * Copyright 2002-2016 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.http.server.reactive;

import java.io.IOException;

import io.undertow.server.HttpServerExchange;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.reactivestreams.Subscriber;
import org.reactivestreams.Subscription;

import org.springframework.core.io.buffer.DataBufferFactory;
import org.springframework.core.io.buffer.DefaultDataBufferFactory;
import org.springframework.http.HttpMethod;
import org.springframework.util.Assert;

/**
 * Adapt {@link HttpHandler} to the Undertow {@link io.undertow.server.HttpHandler}.
 *
 * @author Marek Hawrylczak
 * @author Rossen Stoyanchev
 * @author Arjen Poutsma
 * @since 5.0
 */
public class UndertowHttpHandlerAdapter implements io.undertow.server.HttpHandler {

    private static final Log logger = LogFactory.getLog(UndertowHttpHandlerAdapter.class);

    private final HttpHandler httpHandler;

    private DataBufferFactory bufferFactory = new DefaultDataBufferFactory(false);

    public UndertowHttpHandlerAdapter(HttpHandler httpHandler) {
        Assert.notNull(httpHandler, "HttpHandler must not be null");
        this.httpHandler = httpHandler;
    }

    public void setDataBufferFactory(DataBufferFactory bufferFactory) {
        Assert.notNull(bufferFactory, "DataBufferFactory must not be null");
        this.bufferFactory = bufferFactory;
    }

    public DataBufferFactory getDataBufferFactory() {
        return this.bufferFactory;
    }

    @Override
    public void handleRequest(HttpServerExchange exchange) throws Exception {

        ServerHttpRequest request = new UndertowServerHttpRequest(exchange, getDataBufferFactory());
        ServerHttpResponse response = new UndertowServerHttpResponse(exchange, getDataBufferFactory());

        if (HttpMethod.HEAD.equals(request.getMethod())) {
            response = new HttpHeadResponseDecorator(response);
        }

        HandlerResultSubscriber resultSubscriber = new HandlerResultSubscriber(exchange);
        this.httpHandler.handle(request, response).subscribe(resultSubscriber);
    }

    private class HandlerResultSubscriber implements Subscriber<Void> {

        private final HttpServerExchange exchange;

        public HandlerResultSubscriber(HttpServerExchange exchange) {
            this.exchange = exchange;
        }

        @Override
        public void onSubscribe(Subscription subscription) {
            subscription.request(Long.MAX_VALUE);
        }

        @Override
        public void onNext(Void aVoid) {
            // no op
        }

        @Override
        public void onError(Throwable ex) {
            logger.error("Handling completed with error", ex);
            if (this.exchange.isResponseStarted()) {
                try {
                    logger.debug("Closing connection");
                    this.exchange.getConnection().close();
                } catch (IOException e) {
                    // Ignore
                }
            } else {
                logger.debug("Setting response status code to 500");
                this.exchange.setStatusCode(500);
                this.exchange.endExchange();
            }
        }

        @Override
        public void onComplete() {
            logger.debug("Handling completed with success");
            this.exchange.endExchange();
        }
    }
}