io.reactivex.netty.examples.http.ws.messaging.MessagingServer Maven / Gradle / Ivy
/*
* Copyright 2015 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.
*
*/
package io.reactivex.netty.examples.http.ws.messaging;
import io.netty.buffer.ByteBuf;
import io.netty.handler.codec.http.HttpResponseStatus;
import io.netty.handler.codec.http.websocketx.BinaryWebSocketFrame;
import io.netty.handler.codec.http.websocketx.WebSocketFrame;
import io.netty.handler.logging.LogLevel;
import io.reactivex.netty.examples.ExamplesEnvironment;
import io.reactivex.netty.protocol.http.server.HttpServer;
import rx.Observable;
/**
* An example of how to process discrete messages on a WebSocket server and send acknowledgments for each message
* depicting processing complete.
*
* All messages follow the format as specified by {@link MessageFrame}.
*/
public final class MessagingServer {
public static void main(final String[] args) {
ExamplesEnvironment env = ExamplesEnvironment.newEnvironment(MessagingServer.class);
HttpServer server;
/*Starts a new HTTP server on an ephemeral port.*/
server = HttpServer.newServer()
.enableWireLogging("msg-server", LogLevel.DEBUG)
.start((req, resp) -> {
/*If WebSocket upgrade is requested, then accept the request with an echo handler.*/
if (req.isWebSocketUpgradeRequested()) {
return resp.acceptWebSocketUpgrade(wsConn -> {
Observable in = wsConn.getInput()
.filter(AcceptOnlyBinaryFramesFilter.INSTANCE)
.cast(BinaryWebSocketFrame.class)
.map(f -> {
ByteBuf data = f.content();
data.setByte(data.readerIndex(), 1);
return new MessageFrame(data);
});
return wsConn.writeAndFlushOnEach(in);
});
} else {
/*Else send a NOT FOUND response.*/
return resp.setStatus(HttpResponseStatus.NOT_FOUND);
}
});
/*Wait for shutdown if not called from the client (passed an arg)*/
if (env.shouldWaitForShutdown(args)) {
server.awaitShutdown();
}
/*If not waiting for shutdown, assign the ephemeral port used to a field so that it can be read and used by
the caller, if any.*/
env.registerServerAddress(server.getServerAddress());
}
}