[merlin] singleton not really a singleton ??

[kristian meier]

Hi,

since I made a new build this week I have problems with components which 
are marked as singletons in the xtype-file
but get instantiated serveral times.

my setup is the following:

<block>

 <info>
   <name>proxy-server</name>
 </info>
 <implementation>
   <engine>
    <classpath>
     <fileset dir="../common/lib/common/jentro">
       <include name="com.jentro.http.jar"/>    
      </fileset>
     </classpath>
   </engine>

   <categories name="proxy" priority="INFO" target="log"/>

    <component name="http-server"
     class="com.jentro.http.components.impl.HttpServiceImpl">
     <categories priority="INFO" />

     <configuration>
   <port>4848</port>
     </configuration>
    
   </component>

  . . . .
  . . . .
   <container name="delegator">
    
     <engine>
       <classpath>
         <fileset dir="../navigation/lib/jentro">
            <include name="guidance.jar"/>    
         </fileset>
         <fileset dir="dist">
           <include name="proxy.server.jar"/>  
         </fileset>
       </classpath>
     </engine>
    
     <categories name="delegator" priority="INFO" target="log"/>

     <component name="find-proxy-ip"
       class="com.jentro.manager.proxy.client.server.FindProxyIPComposer"
       activation="startup"/>
    
   </container>
       . . . .

</block>

this configuration starts fine and works correct. but if I an add attribute
activation="startup"
to the "http-server" component than at time of instanciating the 
"find-proxy-ip"  component I get an "address already in use"-exception, 
because a second instance of the "http-server" is created :-(
the old build I use the last 2-3 weeks worked fine. so the question is 
moreless: is this a bug or a feature ? for me the activation attribute 
shouldn't have any effect on the singleton attribute. the effect I have 
when I deploy more than one of these Composer (all different types).

I have another place where I end up with to many different instances of 
singletons, but before digging into that I wanted to find out, if I 
understand the concept of singleton within the container hierachy of a 
block correctly.

with best wishes Kristian





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