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References: 
 <CABioS8QGohEgh1f9ARm9nZbqYYpPc1ZEt65xGDg7T0QasdBXYQ@mail.gmail.com>
	<4F91667F.1070402@die-schneider.net>
Date: Fri, 20 Apr 2012 16:08:05 +0200
Message-ID: 
 <CABioS8TC8XBN_auBXtCD1yrPetCzpWznwOD2Qm4qc3iMuaMuCQ@mail.gmail.com>
Subject: Re: Question about Blueprint Service and Bundle loading
From: Charles Moulliard <cmoulliard@gmail.com>
To: user@aries.apache.org
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Bundle 1 and Bundle 2 export correctly the packages. This is simply the
client which is not able to loads the classes according to the interface
name only as we have 2 different implementations. When the bundle client
starts, its classloader has to load the classes from bundle 1 or bundle 2.
As we are using DynamicImport, this is not done at the starting up of the
bundle but when the bean is instantiated by blueprint. Nevertheless, we
have no possibilities today to tell using DynamicImport that it must loads
classes implemented in Bundle 1 or Bundle 2 depending on info provided in
the <reference interface=3D"" filter=3D""/> and the filter. That should be =
a
great improvement of OSGI + Blueprint if we could have that. That will
allow us to really design / use OSGI as a modular platform.

On Fri, Apr 20, 2012 at 3:37 PM, Christian Schneider <
chris@die-schneider.net> wrote:

>  I don=B4t think that you can influence this... and honestly I don=B4t th=
ink
> you should.
>
> The clean way of loading impl classes for the service would be to offer
> two impls of a Factory interface as an OSGi service. So you could define
> the interfaces at one point and let the Factory service in Bundle1 load t=
he
> classes from bundle 1 and the Factory service in Bundle2 load those in
> Bundle2.
>
> Christian
>
> Am 20.04.2012 13:43, schrieb Charles Moulliard:
>
> Hi,
>
>  I would like to know if this is possible for a bundle to know based on
> info defined in the OSGI Service registered in the OSGI Registry that it
> must loads package by example com.mycompany.poc.service.Feedback from a
> bundle A and not bundle B when its service definition contain a reference
> to a specific filter ?
>
>  Bundle 1
>
>      <service ref=3D"service"
> interface=3D"com.mycompany.poc.service.Feedback">
>         <service-properties>
>             <entry key=3D"version" value=3D"1"/>
>         </service-properties>
>     </service>
>
>  Bundle 2
>
>       <service ref=3D"service"
> interface=3D"com.mycompany.poc.service.Feedback">
>         <service-properties>
>             <entry key=3D"version" value=3D"2"/>
>         </service-properties>
>     </service>
>
>  Bundle 3 =3D Client consuming service
>
>    <bean id=3D"helloBean" class=3D"com.mycompany.poc.client.HelloBean">
>       <property name=3D"feedbackService">
>           <reference interface=3D"com.xtrac.poc.service.Feedback"
> filter=3D"(version=3D1)"/>
>       </property>
>   </bean>
>
>  Here is the definition of the Bundle 3 Manifest
>
>  Import-Service =3D
>  com.xtrac.poc.service.Feedback
>
>  DynamicImport-Package =3D
>  com.xtrac.poc.service
>
>  This definition tells the bundle that it has do dynamically loads
> classes but in this case, the OSGI runtime will load classes from maybe
> Bundle A or bundle B.
>
>  Regards,
>
>  Charles Moulliard
>
> Apache Committer
>
> Blog : http://cmoulliard.blogspot.com
> Twitter : http://twitter.com/cmoulliard
> Linkedin : http://www.linkedin.com/in/charlesmoulliard
> Skype: cmoulliard
>
>
>
> --
> Christian Schneiderhttp://www.liquid-reality.de
>
> Open Source Architect
> Talend Application Integration Division http://www.talend.com
>
>

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Bundle 1 and Bundle 2 export correctly the packages. This is simply the cli=
ent which is not able to loads the classes according to the interface name =
only as we have 2 different implementations. When the bundle client starts,=
 its classloader has to load the classes from bundle 1 or bundle 2. As we a=
re using DynamicImport, this is not done at the starting up of the bundle b=
ut when the bean is instantiated by blueprint. Nevertheless, we have no pos=
sibilities today to tell using DynamicImport that it must loads classes imp=
lemented in Bundle 1 or Bundle 2 depending on info provided in the &lt;refe=
rence interface=3D&quot;&quot; filter=3D&quot;&quot;/&gt; and the filter. T=
hat should be a great improvement of OSGI + Blueprint if we could have that=
. That will allow us to really design / use OSGI as a modular platform.<br>
<br><div class=3D"gmail_quote">On Fri, Apr 20, 2012 at 3:37 PM, Christian S=
chneider <span dir=3D"ltr">&lt;<a href=3D"mailto:chris@die-schneider.net">c=
hris@die-schneider.net</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_=
quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1=
ex">

 =20
   =20
 =20
  <div bgcolor=3D"#FFFFFF" text=3D"#000000">
    I don=B4t think that you can influence this... and honestly I don=B4t
    think you should. <br>
    <br>
    The clean way of loading impl classes for the service would be to
    offer two impls of a Factory interface as an OSGi service. So you
    could define the interfaces at one point and let the Factory service
    in Bundle1 load the classes from bundle 1 and the Factory service in
    Bundle2 load those in Bundle2.<br>
    <br>
    Christian<br>
    <br>
    Am 20.04.2012 13:43, schrieb Charles Moulliard:
    <div><div class=3D"h5"><blockquote type=3D"cite">Hi,
      <div><br>
      </div>
      <div>I would like to know if this is possible for a bundle to know
        based on info defined in the OSGI Service registered in the OSGI
        Registry that it must loads package by example=A0<span>com.mycompan=
y.poc.</span><span>service.Feedback=A0</span>from a bundle A and not
        bundle B when its service definition contain a reference to a
        specific filter ?=A0</div>
      <div><br>
      </div>
      <div>
        <div>Bundle 1=A0</div>
        <div><br>
        </div>
        <div>
          <div>=A0 =A0 &lt;service ref=3D&quot;service&quot;
            interface=3D&quot;com.mycompany.poc.service.Feedback&quot;&gt;<=
/div>
          <div>=A0 =A0 =A0 =A0 &lt;service-properties&gt;</div>
          <div>=A0 =A0 =A0 =A0 =A0 =A0 &lt;entry key=3D&quot;version&quot; =
value=3D&quot;1&quot;/&gt;</div>
          <div>=A0 =A0 =A0 =A0 &lt;/service-properties&gt;</div>
          <div>=A0 =A0 &lt;/service&gt;</div>
          <div><br>
          </div>
          <div>
            <div>Bundle 2</div>
            <div><br>
            </div>
            <div>
              <div>
                =A0 =A0 &lt;service ref=3D&quot;service&quot;
                interface=3D&quot;com.mycompany.poc.service.Feedback&quot;&=
gt;</div>
              <div>=A0 =A0 =A0 =A0 &lt;service-properties&gt;</div>
              <div>=A0 =A0 =A0 =A0 =A0 =A0 &lt;entry key=3D&quot;version&qu=
ot; value=3D&quot;2&quot;/&gt;</div>
              <div>=A0 =A0 =A0 =A0 &lt;/service-properties&gt;</div>
              <div>=A0 =A0 &lt;/service&gt;</div>
            </div>
          </div>
          <div><br>
          </div>
          <div>Bundle 3 =3D Client consuming service</div>
          <div><br>
          </div>
          <div>
            <div>
              <div>=A0&lt;bean id=3D&quot;helloBean&quot;
                class=3D&quot;com.mycompany.poc.client.HelloBean&quot;&gt;<=
/div>
              <div>=A0 =A0 =A0 &lt;property name=3D&quot;feedbackService&qu=
ot;&gt;</div>
              <div>=A0 =A0 =A0 =A0 =A0 &lt;reference
                interface=3D&quot;com.xtrac.poc.service.Feedback&quot;
                filter=3D&quot;(version=3D1)&quot;/&gt;</div>
              <div>=A0 =A0 =A0 &lt;/property&gt;</div>
              <div>=A0 &lt;/bean&gt;</div>
            </div>
          </div>
          <div><br>
          </div>
          <div>Here is the definition of the Bundle 3 Manifest</div>
          <div><br>
          </div>
          <div>
            <div>Import-Service =3D=A0</div>
            <div><span style=3D"white-space:pre-wrap"> </span>com.xtrac.poc=
.service.Feedback</div>
            <div><br>
            </div>
            <div>DynamicImport-Package =3D=A0</div>
            <div><span style=3D"white-space:pre-wrap"> </span>com.xtrac.poc=
.service</div>
          </div>
          <div><br>
          </div>
          <div>This definition tells the bundle that it has do
            dynamically loads classes but in this case, the OSGI runtime
            will load classes from maybe Bundle A or bundle B.=A0</div>
          <div><br>
          </div>
          <div>Regards,</div>
        </div>
      </div>
      <div>
        <pre style=3D"padding-top:0px;padding-right:0px;padding-bottom:0px;=
padding-left:0px;margin-top:5px;margin-left:15px;margin-bottom:5px;margin-r=
ight:5px;text-align:left;font-size:11px;line-height:16px"><span>
</span></pre>
        Charles Moulliard<br>
        <br>
        Apache Committer<br>
        <br>
        Blog : <a href=3D"http://cmoulliard.blogspot.com" target=3D"_blank"=
>http://cmoulliard.blogspot.com</a><br>
        Twitter : <a href=3D"http://twitter.com/cmoulliard" target=3D"_blan=
k">http://twitter.com/cmoulliard</a><br>
        Linkedin : <a href=3D"http://www.linkedin.com/in/charlesmoulliard" =
target=3D"_blank">http://www.linkedin.com/in/charlesmoulliard</a><br>
        Skype: cmoulliard<br>
      </div>
    </blockquote>
    <br>
    <br>
    </div></div><span class=3D"HOEnZb"><font color=3D"#888888"><pre cols=3D=
"72">--=20
Christian Schneider
<a href=3D"http://www.liquid-reality.de" target=3D"_blank">http://www.liqui=
d-reality.de</a>

Open Source Architect
Talend Application Integration Division <a href=3D"http://www.talend.com" t=
arget=3D"_blank">http://www.talend.com</a> </pre>
  </font></span></div>

</blockquote></div><br>

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