Re: [HiveMind] Extension to adder example

Harish Krishnaswamy Tue, 16 Sep 2003 16:33:50 -0700

You wouldn't believe, I had done the very same thing except called it a Calculator!

Here are my modules...

Service point module:

<?xml version="1.0"?>

<module id="hivemind.examples" version="1.0.0">

<service id="Adder" interface="hivemind.examples.Adder" model="singleton"/>

<service id="Subtracter" interface="hivemind.examples.Subtracter" model="singleton"/>

<service id="Calculator" interface="hivemind.examples.Calculator" model="singleton"> <invoke-factory service-id="hivemind.BuilderFactory"> <construct class="hivemind.examples.impl.CalculatorImpl"> <set-service property="adder" service-id="Adder"/> <set-service property="subtracter" service-id="Subtracter"/> </construct> </invoke-factory> </service>

</module>

Service module:
<?xml version="1.0"?>

<module id="hivemind.examples.impl" version="1.0.0">

 <extend-service service-id="hivemind.examples.Adder">
     <create-instance class="hivemind.examples.impl.AdderImpl"/>
 </extend-service>

 <extend-service service-id="hivemind.examples.Subtracter">
     <create-instance class="hivemind.examples.impl.SubtracterImpl"/>
 </extend-service>

</module>

Client module:
<?xml version="1.0"?>

<module id="hivemind.examples.log" version="1.0.0">

 <extend-service service-id="hivemind.examples.Adder">
   <interceptor service-id="hivemind.LoggingInterceptor" order="10"/>
 </extend-service>

</module>

And the rest is Hivemind! I am really liking it a lot. I can't wait for Tapestry 3.1!

-Harish

Bill Lear wrote:

What I'd like to do is to define a service analogous to the Adder,
Subtracter.

Then, I'd like to define a service, Math that uses the Adder and
Subtracter modules to provide the following interface:

public interface Math {
   int add(int arg0, int arg1);
   int subtract(int arg0, int arg1);
}

with implementation:

package hivemind.examples.impl;

import hivemind.examples.Math;
import hivemind.examples.Adder;
import hivemind.examples.Subtracter;

public class MathImpl implements Math {
   private Adder adder;

   public void setAdder(Adder adder) {
       this.adder = adder;
   }

private Subtracter subtracter;

   public void setSubtracter(Subtracter subtracter) {
       this.subtracter = subtracter;
   }

   public int add(int arg0, int arg1) {
       return adder.add(arg0, arg1);
   }

   public int subtract(int arg0, int arg1) {
       return subtracter.add(arg0, arg1);
   }
}

and call it from code thus (after appropriate registry construction,
etc.):

       Math math = (Math) registry.getService("hivemind.examples.Math",
                                              Math.class);

       System.out.println("Result of add: " + math.add(arg0, arg1));
       System.out.println("Result of subtract: " + math.subtract(arg0, arg1));

I'm a bit confused as to how to tie all of this together.  Could someone
provide some pointers?

Thanks.

Bill

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Re: [HiveMind] Extension to adder example

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