Creating the XML files

Our warrant has a netlet descriptor embedded in it, so we'll create the descriptor first and then the warrant:

% ls
hello1.jar  helloserver.jar
% jtrixmaker -type netlet -outfile hello-server.xml \
     -jardirs . -jars helloserver.jar \
     -classname org.jtrix.project.helloworld.HelloServer
% ls
hello-server.xml  hello1.jar  helloserver.jar
% jtrixmaker -type warrant -descriptor-in hello-server.xml \
     -outfile hello-local-warrant.xml
% ls
hello-local-warrant.xml  hello-server.xml  hello1.jar  helloserver.jar
% 

The first call to jtrixmaker creates the descriptor for the netlet we've just written. We give it this information:

• What type of file we're creating, in this case a netlet descriptor.
• What file it should be output to.
• What directories to look in for the JARs. In this case, just the current directory.
• What JARs need to go in the netlet descriptor. In this case, just helloserver.jar. Of course, the code also makes use of jtrix.jar, but we are guaranteed this will always be available on any Jtrix node we run on, so we don't need to carry it with us.
• The class which implements the INetlet interface.

Once we've got the descriptor, the second call to jtrixmaker creates the warrant. We give it this information:

• What type of file we're creating, in this case a warrant.
• What descriptor should go in the warrant. In this case the file hello-server.xml we've just created. Other options to jtrixmaker allow us to point to a SAS, instead, which will serve the descriptor.
• What the resulting warrant file should be called.

Now we can create the netlet descriptor for the client netlet. Why should we do this, you may ask, after all, aren't we using the same client netlet from before? The answer is Yes, but look back to where we created that descriptor (Section ). Notice that we put the warrant inside it as a parameter. So now we must recreate it, this time using our new warrant as the parameter:

% ls
hello-local-warrant.xml  hello-server.xml  hello1.jar  helloserver.jar
% jtrixmaker -type netlet -outfile hello1-client.xml \
     -jardirs /usr/lib/jtrix . -jars libjtrix.jar hello1.jar \
     -classname org.jtrix.project.helloworld.Hello1Client \
     -param {warrant:hello-local-warrant.xml}
% ls
hello-local-warrant.xml  hello1-client.xml  helloserver.jar
hello-server.xml         hello1.jar
% 

In a future chapter (Chapter ) we'll write a client netlet that reads in its warrant parameter from the command line. But that's for later. For now, let's get on and run our example.