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Passing information via InvocationContext in interceptors
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created by <a href="http://community.jboss.org/people/arjun_kumaar">Arjun Kumaar</a> in <i>EJB3</i> - <a href="http://community.jboss.org/message/612633#612633">View the full discussion</a>
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<div class="jive-rendered-content"><p>Can I pass data in invocation context via remote method calls?</p><p>I have two stateless session beans</p><p>BeanA and BeanB</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I have an interceptor for each bean</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>BeanAInterceptor for BeanA.methodA</p><p>BeanBInterceptor for BeanB.methodB</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>In BeanAInterceptor, I set some context data.</p><p>In BeanA.methodA, I get an handle to BeanB and call BeanB.methodB</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>In the process, BeanBInterceptor gets called and I want to read the context data</p><p>that I set in BeanAInterceptor, but I get null.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Is there any way to pass data via InvocationContext across remote calls if BeanA</p><p>and BeanB are deployed in </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>a. same jvm</p><p>b. different jvm</p><p>c. in a clustered environment.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>In short I want to send data across ejbs, but via interceptors and not </p><p>as parameters to method calls.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I am pasting the relevant code below.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>@Stateless</p><p>public class BeanA {    </p><p>    </p><p>    @Resource</p><p>    SessionContext ctx;</p><p>    </p><p>    @Interceptors(BeanAInterceptor.class)</p><p>    public void methodA() {</p><p>        BeanBRemote bRemote = ctx</p><p>                    .getBusinessObject(BeanB.class);</p><p>        bRemote.methodB();</p><p>    }</p><p>    </p><p>}</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>public class BeanAInterceptor {</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    @AroundInvoke</p><p>    public Object interceptA(InvocationContext ctx) throws Exception {</p><p>        Map<String, Object> ctxData = ctx.getContextData();</p><p>        ctxData.put("key", "value");</p><p>        return ctx.proceed();</p><p>    }</p><p>    </p><p>}</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>@Stateless</p><p>public class BeanB {</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    @Interceptors(BeanBInterceptor.class)</p><p>    public void methodB() {</p><p>        //do something</p><p>        return;</p><p>    }</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>}</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>public class BeanBInterceptor {</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    @AroundInvoke</p><p>    public Object interceptB(InvocationContext ctx) throws Exception {</p><p>        Map<String, Object> ctxData = ctx.getContextData();</p><p>        Object val = ctxData.get("key"); //I get val as null here</p><p>        return ctx.proceed();</p><p>    }</p><p>    </p><p>}</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Thanks</p><p>Arjun</p></div>
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