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Subject: [jboss-user] [EJB3] - Obtaining an EJB proxy from a CDI Interceptor
From: Paul Robinson <do-not-reply () jboss ! com>
Date: 2013-01-30 14:27:37
Message-ID: 2-795148-3-11488-1359556047632.jivesbs.jivemailuser () https://community ! jboss ! org
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Paul Robinson [https://community.jboss.org/people/paul.robinson] created the \
discussion
"Obtaining an EJB proxy from a CDI Interceptor"
To view the discussion, visit: https://community.jboss.org/message/795148#795148
--------------------------------------------------------------
Hello,
I have a CDI interceptor that when placed on an EJB method (of a SLSB) enlists the \
EJB in a protocol for which it will later receive callbacks that enable it to \
participate in the protocol.
Here's a simplified version of the code:
@ServiceRequest
@Interceptor
public class ServiceRequestInterceptor {
@AroundInvoke
public Object intercept(InvocationContext ic) throws Throwable {
Object targetInstance = ic.getTarget();
//register targetInstance in the protcol
}
}
Reflection is then used to make invocations on 'targetInstance' as the protocol \
progresses. The problem is that 'targetInstance' is the actual java instance, so \
invocations bypass the whole EJB stack. I imagine causes problems for instance \
management as I'm accessing the bean without the EJB container knowing. But, the more \
immediate problem I'm seeing is that this approach prevents EJB features like CMT \
from working.
I think the solution to my problem is to somehow lookup the right EJB proxy in the \
interceptor. However, I'm unsure how to do this as I won't know the details such as \
the appName or moduleName. The interceptor does have access to the .class of the bean \
implementation, if this helps?
Any ideas would be much appreciated.
Paul.
--------------------------------------------------------------
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17px; font-weight: normal;"> Obtaining an EJB proxy from a CDI Interceptor
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<span style="margin-bottom: 10px;">
created by <a href="https://community.jboss.org/people/paul.robinson">Paul \
Robinson</a> in <i>EJB3</i> - <a \
href="https://community.jboss.org/message/795148#795148">View the full discussion</a> \
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1px;">
<div class="jive-rendered-content"><p>Hello,</p><p style="min-height: 8pt; height: \
8pt; padding: 0px;"> </p><p>I have a CDI interceptor that when placed on an EJB \
method (of a SLSB) enlists the EJB in a protocol for which it will later receive \
callbacks that enable it to participate in the protocol. </p><p style="min-height: \
8pt; height: 8pt; padding: 0px;"> </p><p>Here's a simplified version of the \
code:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p \
style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><pre \
class="jive-pre"><code class="jive-code jive-java">@ServiceRequest @Interceptor
<font color="navy"><b>public</b></font> <font color="navy"><b>class</b></font> \
ServiceRequestInterceptor <font color="navy">{</font>  
    @AroundInvoke
    <font color="navy"><b>public</b></font> Object \
intercept(InvocationContext ic) <font color="navy"><b>throws</b></font> Throwable \
<font color="navy">{</font>  
        Object targetInstance = ic.getTarget();
        <font color="darkgreen">//register \
targetInstance in the protcol</font>     <font color="navy">}</font>
<font color="navy">}</font>
</code></pre><p style="min-height: 8pt; height: 8pt; padding: \
0px;"> </p><p>Reflection is then used to make invocations on 'targetInstance' as \
the protocol progresses. The problem is that 'targetInstance' is the actual java \
instance, so invocations bypass the whole EJB stack. I imagine causes problems for \
instance management as I'm accessing the bean without the EJB container knowing. But, \
the more immediate problem I'm seeing is that this approach prevents EJB features \
like CMT from working. </p><p style="min-height: 8pt; height: 8pt; padding: \
0px;"> </p><p>I think the solution to my problem is to somehow lookup the right \
EJB proxy in the interceptor. However, I'm unsure how to do this as I won't know the \
details such as the appName or moduleName. The interceptor does have access to the \
.class of the bean implementation, if this helps?</p><p style="min-height: 8pt; \
height: 8pt; padding: 0px;"> </p><p>Any ideas would be much appreciated.</p><p \
style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Paul.</p></div>
<div style="background-color: #f4f4f4; padding: 10px; margin-top: 20px;">
<p style="margin: 0;">Reply to this message by <a \
href="https://community.jboss.org/message/795148#795148">going to Community</a></p> \
<p style="margin: 0;">Start a new discussion in EJB3 at <a \
href="https://community.jboss.org/choose-container!input.jspa?contentType=1&containerType=14&container=2029">Community</a></p>
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