DebugMantisSSE.java

/*
 * Copyright 2014 Netflix, Inc.
 *
 * 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.
 */

import io.netty.buffer.ByteBuf;
import io.reactivex.netty.RxNetty;
import io.reactivex.netty.pipeline.PipelineConfigurators;
import io.reactivex.netty.protocol.http.server.HttpServerRequest;
import io.reactivex.netty.protocol.http.server.HttpServerResponse;
import io.reactivex.netty.protocol.http.server.RequestHandler;
import io.reactivex.netty.protocol.text.sse.ServerSentEvent;
import rx.Observable;
import rx.exceptions.OnErrorThrowable;
import rx.functions.Func1;

import java.util.concurrent.TimeUnit;

/**
 * @author Nitesh Kant
 */
public class Example {

    public static void main(String[] args) {
        RxNetty.createHttpServer(
                8888,
                new RequestHandler<ByteBuf, ServerSentEvent>() {
                    @Override
                    public Observable<Void> handle(HttpServerRequest<ByteBuf> request,
                                                   final HttpServerResponse<ServerSentEvent> response) {
                        return Observable.interval(1, TimeUnit.SECONDS)
                                         .map(new Func1<Long, String>() {
                                             @Override
                                             public String call(Long aLong) {
                                                 return String.valueOf(aLong);
                                             }
                                         })
                                         .flatMap(new Func1<String, Observable<Void>>() {

                                             @Override
                                             public Observable<Void> call(String value) {
                                                 response.getHeaders().set("Access-Control-Allow-Origin", "*");
                                                 response.getHeaders().set("content-type", "text/event-stream");
                                                 return response.writeAndFlush(new ServerSentEvent("1", "data", value));
                                             }
                                         })
                                         .onErrorFlatMap(new Func1<OnErrorThrowable, Observable<Void>>() {
                                             @Override
                                             public Observable<Void> call(OnErrorThrowable error) {
                                                 error.printStackTrace();
                                                 return response.writeStringAndFlush(error.getMessage());
                                             }
                                         })
                                         .onErrorFlatMap(new Func1<OnErrorThrowable, Observable<Void>>() {
                                             // There's nothing we can do this time, so we simply report the error
                                             @Override
                                             public Observable<Void> call(OnErrorThrowable error) {
                                                 error.printStackTrace();
                                                 return Observable.empty();
                                             }
                                         });
                    }
                },
                PipelineConfigurators.<ByteBuf>sseServerConfigurator()
        ).startAndWait();
    }
}