Right on the money ... except that I probably would not both defining the service
model for Adder
and Subtractor; the default ("deferred") is less efficient, but less trouble as well.
Making those
services singletons (rather than deferred singletons) is a premature optimization.
--
Howard M. Lewis Ship
Creator, Tapestry: Java Web Components
http://jakarta.apache.org/tapestry
http://jakarta.apache.org/commons/sandbox/hivemind/
http://javatapestry.blogspot.com
> -----Original Message-----
> From: Harish Krishnaswamy [mailto:[EMAIL PROTECTED]
> Sent: Tuesday, September 16, 2003 7:31 PM
> To: Jakarta Commons Developers List
> Subject: Re: [HiveMind] Extension to adder example
>
>
> 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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> >
> >
> >
> >
>
>
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