The source can be found here

To keep it as simple as possible, this example uses "telnet" as its communication-form, but it could easily be modified into a full blown stack of REST/SOAP, WebApps etc..

It shows the following:

• how one or multiple clients can discover one or multiple servers and use them
• with automatic load balancing.
• you can add and remove servers and clients on the fly

To follow this Guide you have to have Git and Maven installed

Download and start ZooKeeper

In our example we're only going to use one ZooKeeper node, but in production you would have several distributed around your network - no single point of failure..

Clone the ddsl project from GitHub to get a local copy

git clone [email protected]:mbknor/ddsl.git

Go into the folder ddsl/examples/ddsl-java-examples

We are now ready to start the first server:

execute the following using maven:

mvn package exec:java -Dexec.mainClass="ddslexamples.DdslServiceProvider"

The server starts up, picks a random port and starts listening on it. then it broadcasts its location to ddsl.

To set up a client, just open a new terminal, go to the folder ddsl/examples/ddsl-java-examples, and start the consumer with maven:

mvn package exec:java -Dexec.mainClass="ddslexamples.DdslServiceConsumer"

Now you can see them communicating

Now, open a new terminal and starts another server.. You will see that the client automatically starts to use both servers..

Then add some more clients, and servers, take some down... etc....

Note: If no server for a specific ServiceID is pressent in ddsl, the client will try to load location info from a file. Since this file is missing in this example the client will fail getting a location and will quit.