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#Netty-socketio Overview
This project is an open-source Java implementation of [Socket.IO](http://socket.io/) server. Based on [Netty](http://netty.io/) server framework.
Checkout [Demo project](https://github.com/mrniko/netty-socketio-demo)
Licensed under the Apache License 2.0.
Features================================* Supports 0.7+ version of [Socket.IO-client](https://github.com/LearnBoost/socket.io-client) up to 0.9.16 * Supports xhr-polling transport * Supports flashsocket transport * Supports websocket transport: HyBi 00 (which is the same as Hixie 76), HyBi 8-10 and HyBi 13-17 (17 is the same as IETF 6455). * Supports namespaces and rooms * Supports ack (acknowledgment of received data) * Supports SSL * Supports client store (Memory, [Redisson](https://github.com/mrniko/redisson), [Hazelcast](http://www.hazelcast.com/)) * Supports distributed broadcast across netty-socketio nodes ([Redisson](https://github.com/mrniko/redisson), [Hazelcast](http://www.hazelcast.com/)) * Supports OSGi * Supports Spring * Lock-free and thread-safe implementation * Declarative handler configuration via annotations
Performance================================
CentOS, 1 CPU, 4GB RAM runned on VM (based on customer report, tested in 2012):
CPU 10%, Memory 15% 6000 xhr-long polling sessions or 15000 websockets sessions 4000 messages per second
Projects using netty-socketio================================ARSnova: [arsnova.eu](https://arsnova.eu) Zipwhip: [zipwhip.com](https://zipwhip.com/)
Recent Releases================================####Please Note: trunk is current development branch.
####25-Mar-2014 - version 1.6.4 released (JDK 1.6+ compatible, Netty 4.0.17)
Fixed - message release problem Fixed - problem with exception listener configuration redefinition __Breaking api change__ - DataListener.onData now throws Exception Improvement - data parameter added to exception listener Improvement - ability to setup socket configuration Improvement - Configuration.autoAck parameter added
####06-Mar-2014 - version 1.6.3 released (JDK 1.6+ compatible, Netty 4.0.17)
Fixed - AckCallback handling during client disconnect Fixed - unauthorized handshake HTTP code changed to 401 __Breaking api change__ - Configuration.heartbeatThreadPoolSize setting removed Feature - annotated Spring beans support via _SpringAnnotationScanner_ Feature - common exception listener Improvement - _ScheduledExecutorService_ replaced with _HashedWheelTimer_
####08-Feb-2014 - version 1.6.2 released (JDK 1.6+ compatible, Netty 4.0.15)
Fixed - wrong namespace client disconnect handling Fixed - exception in onConnect/onDisconnect/isAuthorized methods leads to server hang __Breaking api change__ - SocketIOClient.sendEvent methods signature changed Improvement - multi type events support via _MultiTypeEventListener_ and _OnEvent_ annotation Improvement - multi type events ack support via _MultiTypeAckCallback_ Improvement - SocketIOClient.getHandshakeData method added Improvement - Jedis replaced with [Redisson](https://github.com/mrniko/redisson)
####14-Jan-2014 - version 1.6.1 released (JDK 1.6+ compatible, Netty 4.0.14)
Fixed - JDK 1.6+ compatibility Feature - authorization support
####19-Dec-2013 - version 1.6.0 released (JDK 1.6+ compatible, Netty 4.0.13)
Fixed - XHR-pooling transport regression Fixed - Websocket transport regression Fixed - namespace NPE in PacketHandler Fixed - executors shutdown during server stop Feature - client store (Memory, [Redis](http://redis.io/), [Hazelcast](http://www.hazelcast.com/)) support Feature - distributed broadcast across netty-socketio nodes ([Redis](http://redis.io/), [Hazelcast](http://www.hazelcast.com/)) support Feature - OSGi support (thanks to rdevera) Improvement - XHR-pooling optimization Improvement - SocketIOClient.getAllRooms method added
####07-Dec-2013 - version 1.5.4 released (JDK 1.6+ compatible, Netty 4.0.13)
Fixed - flash policy "request leak" after page reload (thanks to ntrp) Fixed - websocket swf loading (thanks to ntrp) Fixed - wrong urls causes a potential DDoS Fixed - Event.class package visibility changed to avoid direct usage Improvement - Simplified Jackson modules registration
####24-Oct-2013 - version 1.5.2 released (JDK 1.6+ compatible, Netty 4.0.11)
Fixed - NPE during shutdown Improvement - isEmpty method added to Namespace
####13-Oct-2013 - version 1.5.1 released (JDK 1.6+ compatible, Netty 4.0.9)
Fixed - wrong ack timeout callback invocation Fixed - bigdecimal serialization for JSON Fixed - infinity loop during packet handling exception Fixed - 'client not found' handling
####27-Aug-2013 - version 1.5.0 released (JDK 1.6+ compatible, Netty 4.0.7)
Improvement - encoding buffers allocation optimization. Improvement - encoding buffers now pooled in memory to reduce GC pressure (netty 4.x feature).
####03-Aug-2013 - version 1.0.1 released (JDK 1.5+ compatible)
Fixed - error on unknown property during deserialization. Fixed - memory leak in long polling transport. Improvement - logging error info with inbound data. ####07-Jun-2013 - version 1.0.0 released (JDK 1.5+ compatible)
First stable release.
### Maven
Include the following to your dependency list:
<dependency> <groupId>com.corundumstudio.socketio</groupId> <artifactId>netty-socketio</artifactId> <version>1.6.3</version> </dependency>
Usage example================================##Server
Base configuration. More details about Configuration object is [here](https://github.com/mrniko/netty-socketio/wiki/Configuration-details).
Configuration config = new Configuration(); config.setHostname("localhost"); config.setPort(81);
SocketIOServer server = new SocketIOServer(config); Programmatic handlers binding: server.addMessageListener(new DataListener<String>() { @Override public void onData(SocketIOClient client, String message, AckRequest ackRequest) { ... } });
server.addEventListener("someevent", SomeClass.class, new DataListener<SomeClass>() { @Override public void onData(SocketIOClient client, Object data, AckRequest ackRequest) { ... } });
server.addConnectListener(new ConnectListener() { @Override public void onConnect(SocketIOClient client) { ... } });
server.addDisconnectListener(new DisconnectListener() { @Override public void onDisconnect(SocketIOClient client) { ... } });
// Don't forget to include type field on javascript side, // it named '@class' by default and should equals to full class name. // // TIP: you can customize type field name via Configuration.jsonTypeFieldName property.
server.addJsonObjectListener(SomeClass.class, new DataListener<SomeClass>() { @Override public void onData(SocketIOClient client, SomeClass data, AckRequest ackRequest) {
...
// send object to socket.io client SampleObject obj = new SampleObject(); client.sendJsonObject(obj); } }); Declarative handlers binding. Handlers could be bound via annotations on any object:
pubic class SomeBusinessService { ... // some stuff code ...
// SocketIOClient, AckRequest and Data could be ommited @OnEvent('someevent') public void onSomeEventHandler(SocketIOClient client, SomeClass data, AckRequest ackRequest) { ... } @OnConnect public void onConnectHandler(SocketIOClient client) { ... }
@OnDisconnect public void onDisconnectHandler(SocketIOClient client) { ... }
// only data object is required in arguments, // SocketIOClient and AckRequest could be ommited @OnJsonObject public void onSomeEventHandler(SocketIOClient client, SomeClass data, AckRequest ackRequest) { ... }
// only data object is required in arguments, // SocketIOClient and AckRequest could be ommited @OnMessage public void onSomeEventHandler(SocketIOClient client, String data, AckRequest ackRequest) { ... }
} SomeBusinessService someService = new SomeBusinessService(); server.addListeners(someService);
server.start(); ... server.stop();
##Client
<script type="text/javascript" src="socket.io.js" charset="utf-8"></script>
<script type="text/javascript">
var socket = io.connect('http://localhost:81', { 'reconnection delay' : 2000, 'force new connection' : true });
socket.on('message', function(data) { // here is your handler on messages from server });
socket.on('connect', function() { // connection established, now we can send an objects
// send json-object to server // '@class' property should be defined and should // equals to full class name. var obj = { '@class' : 'com.sample.SomeClass', ... }; socket.json.send(obj);
// send event-object to server // '@class' property is NOT necessary in this case var event = { ... }; socket.emit('someevent', event);
});
</script>
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