Re: [picocontainer-dev] Tiering support 4 Pico

Jörg,

Can you make a testcase for that ?

- Paul

On Apr 28, 2008, at 12:42 AM, Jörg Schaible wrote:

>
> Well, this is related to a topic we had on the list before: How to  
> publish components of a contain er explicitly i.e. only published  
> components can be looked up by child containers or directly, while  
> unpublished components can be used for dependency resolution of  
> components within the same container. Maybe we can come up with  
> something that covers both cases.
>
> Use case for explicit publishing was always the addition of  
> "modules" with own Pico hierarchies that should not expose internal  
> deps to clients.
>
> Paul Hammant wrote:
>> I've shoved in a new class org.picocontainer.containers.TieringGuard
>> (subject to rename).
>>
>> And there's a testcase at the bottom of DPCTC  (
>> http://svn.codehaus.org/picocontainer/java/2.x/trunk/pico/cont
>> ainer/src/test/org/picocontainer/ 
>> DefaultPicoContainerTestCase.java   )
>>
>>     public static class Couch {
>>     }
>>
>>     public static class TiredPerson {
>>         private Couch couchToSitOn;
>>         public TiredPerson(Couch couchToSitOn) {
>>             this.couchToSitOn = couchToSitOn;
>>         }
>>     }
>>
>>     @Test public void
>> testThatParentTraversalForComponentsCanBeBlocked() {
>>         DefaultPicoContainer grandparent = new
>> DefaultPicoContainer();
>>         DefaultPicoContainer parent = (DefaultPicoContainer)
>> grandparent.makeChildContainer();
>>         parent.setTiering(true);
>>         DefaultPicoContainer child = (DefaultPicoContainer)
>>         parent.makeChildContainer(); child.setTiering(true);
>>         grandparent.addComponent(Couch.class);
>>         child.addComponent(TiredPerson.class);
>>
>>         TiredPerson tp = null;
>>         try {
>>             tp = child.getComponent(TiredPerson.class);
>>             fail("should have barfed");
>>         } catch
>> (AbstractInjector.UnsatisfiableDependenciesException
>> e) {
>>             System.out.println("");
>>             // expected
>>         }
>>
>>     }
>> The idea is that in a tiered application, you should only depend on
>> the classes from the immediate tier below you.
>> Thus DPC now has a setTiering(boolean) method (subject to rename).
>> TieringGuard uses a static ThreadLocal to indicate to parents that
>> we're traversing towards the root of the container tree to fill deps.
>> Comments appreciated. - Paul
>>
>>
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