Re: Configuration ?

17 Oct 2004 11:11:02 -0000 

Hi,

thanks for the answer. I think I just wanted to overcompicate it as usual ;)

I wanted to have my DataSource(s) as private 'services' (objects) configured individually for each service which needs it.
But I guess that's just something I do not really need, and it's easier this way.

Istvan

Hello Istvan,

First of all the problem you describe is not actually related to
configuration points and contributions in HiveMind.
I think one easy way to do what you want is to do something like that:

<service-point id="DataSource1" interface="javax.sql.DataSource">
        <invoke-factory service-id="hivemind.BuilderFactory">
                <construct class="org.apache.commons.dbcp.BasicDataSource">
                        ...
                </construct>
        </invoke-factory>
</service-point>
<service-point id="DataSource2" interface="javax.sql.DataSource">
        <invoke-factory service-id="hivemind.BuilderFactory">
                <construct class="org.apache.commons.dbcp.BasicDataSource">
                        ...
                </construct>
        </invoke-factory>
</service-point>

And then for any service that need access to DataSource1:

<service-point id="MyDAO" interface="com.acme.MyDAO">
        <invoke-factory service-id="hivemind.BuilderFactory">
                <construct class="com.acme.MyDAOImpl">
                        <set-service property="dataSource"
                                        service-id="DataSource1">
                </construct>
        </invoke-factory>
</service-point>

What is important here (it seems you missed that) is not to exclusively use
<set> when you use BuilderFactory, but use the more appropriate
<set-service>.

If you have a service that needs both DataSource 1 & 2, just do:

<service-point id="MyComplexDAO" interface="com.acme.MyComplexDAO">
        <invoke-factory service-id="hivemind.BuilderFactory">
                <construct class="com.acme.MyDAOComplexImpl">
                        <set-service property="dataSource1"
                                        service-id="DataSource1">
<set-service property="dataSource2"
                                        service-id="DataSource2">
</construct>
        </invoke-factory>
</service-point>

Hope this helps


-----Original Message-----
From: Istvan Orban [mailto:[EMAIL PROTECTED]
Sent: Sunday, October 17, 2004 3:13 PM
To: [email protected]
Subject: Configuration ?

Hi,

I come across with an other problem. it seems the configuration and
contribution part is not fully clear for in Hivemind.

I have some services which needs Database access,
I have got 2 services accessing the same db, and an other which requests
data from a second db.

I do not want to create 2 servicse for accessing the the 2 db, although
I like this example as how easy to configure DB access with Hivemind

   <service-point id="DefaultDataSource" interface="javax.sql.DataSource">
       <invoke-factory service-id="hivemind.BuilderFactory">
           <construct class="org.apache.commons.dbcp.BasicDataSource">
               <set property="driverClassName"
value="org.firebirdsql.jdbc.FBDriver"/>
               <set property="url"
value="jdbc:firebirdsql:localhost/3050:D:/Firebird/data/etstore.gdb"/>
               <set property="username" value="SYSDBA"/>
               <set property="password" value="masterkey"/>
           </construct>
       </invoke-factory>
   </service-point>


My services has a property called Datasource and I would like to feed
them somehow using the configuratoin power of Hivemind.
But I'm little stuck how could I have 2 configurations where I have 2
pooled DataSource with all the config values set
and when defining the 3 servies I would just bind the needed Datasource
to the service.

Could someone give me some useful advices, or directions what should I
use, or how could I achive this the best way.

Thanks a lot!

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