This project contains a fully implemented client-server infrastructure controlled by Java-Annotations. A general instruction on how to use this framework and how the required classes should be implemented is provided below.
The communication can be built on single and/or multicast connections and the receiving and writing process must be declared. To use a client or server, the following classes must be implemented:
| Class | Client | Server | Multicast |
|---|---|---|---|
| XTralConfiguration | X | X | X |
| SocketFactory | X | ||
| ChannelFactory | X | X | X |
| ConnectionFactory | X | X | X |
| ServerSocketFactory | X | ||
| ServerBootstrapFactory | X | ||
| DatagramSocketFactory | X |
The Channel, Connection and ServerBootstrap classes have to be implemented as well if they should be used. For these
classes exists pre-defined abstract base classes that provide the basic behaviour.
For more information about how to implement each component, please refer to the proto4j-msdp repository (link). It can be used as an example for further developing.
Some Examples:
XTralClient client = XTral.client(FooClient.class);
client.start(fooArg1, barArg2);
// same with a server
XTralServer server = XTral.server(FooServer.class, "argument1", "optional2");
server.start();Both, client and server structures must provide the following packaging:
root/
MyClient.class
Foo.class
...
sub-package/
Handler1.class
Handler2.class
...
All classes that are stored in the root and sub-packages will be used within the client or server.
Usually a client is used to connect to a server and send messages to it. The following client just connects to the localhost:
package src.localhost.client;
@Client // used to indicate that this class will be the base reference
@AllowConfig // indicates that this class provides the configuration object
public class LocalHostClient implements XTralConfigurationFactory<LocalHostClient> {
@Client.Entry // this annotation allows the XTralClient to start on this method
public void connectToServer(XTralClient client) {
FooConnection connection = client.openConnection(); // open but do not connect
connection.init(new MyConnectSpec()); // or null of no spec was implemented
connection.doConnect(InetAddress.getLocalHost(), 4444); // connect to server
}
@Override
public XTralConfiguration<MsdpClient> createConfiguration() {
return new MyLocalHostConfiguration(); // implemented configuration
}
}In order to react to messages that should be sent and messages that have been received, Agent classes have to be defined. They
consist of methods that should react as a handler:
package src.localhost.client.handler; // note the sub-package here
@Agent // this class will be a worker
public MessageListener {
@InboundHandler(addFirst = true) //handle incoming messages first
public void onMessage(Object msg, FooConnection connection) {
// we assume the msg is a string
System.out.println((String)msg);
}
// last handler that can modify the message
@OutboundHandler(addLast = true)
public String onMessagePrepared(String msg) {
// the returned object will be sent to the server
if (msg == null) return "no-message";
else return msg;
}
}There are three pre-defined handler annotations: InboundHanler, OutboundHandler and ExceptionHandler. It is also possible to declare own handlers that react to specific events in custom implementations of the Connection class:
// this annotation marks this class as a handler annotation
@IncludedHandler
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.METHOD})
public @interface FooHandler {}Download the latest JAR file from the releases tab. This framework requires a minimum of Java 8+ for developing and running.
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