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Event Handling between two EJB-JARs (Observer Pattern?)
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created by <a href="https://community.jboss.org/people/patsinnervoice">Patrick M.</a> in <i>EJB3</i> - <a href="https://community.jboss.org/message/783044#783044">View the full discussion</a>
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<div class="jive-rendered-content"><p>Hi,</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I'm new to EJB development and currently search for the best/correct way to handle events between two EJB-JARs which are in one EAR.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I tried to use the Observer Pattern. The event gets fired in BeanA but does not reach BeanB (as stated, two different EJB-JARs = two different Eclipse Projects in one Workspace / EAR).</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>My Code currently looks kind of like this:</p><pre class="jive-pre"><code class="jive-code jive-java">@DependsOn(<font color="red">"BeanB"</font>)
@Startup
@Singleton
@WebService
<font color="navy"><b>public</b></font> <font color="navy"><b>class</b></font> BeanA <font color="navy"><b>implements</b></font> BeanARemote, BeanBLocal<font color="navy">{</font>
 
          @PersistenceContext
          <font color="navy"><b>private</b></font> EntityManager em;
 
          @EJB
          <font color="navy"><b>private</b></font> BeanA beanA;
 
        <font color="navy"><b>public</b></font> <font color="navy"><b>void</b></font> listenToReceivedEvent(@Observes ReceivedEvent events)<font color="navy">{</font>
          Query query = em.Query(<font color="red">"some query"</font>);
          <font color="darkgreen">//implementation</font>
        <font color="navy">}</font>
<font color="navy">}</font>
 
@Singleton
<font color="navy"><b>public</b></font> <font color="navy"><b>class</b></font> BeanB <font color="navy"><b>implements</b></font> BeanBLocal <font color="navy">{</font>
  
          @Inject
          Event<ReceivedEvent> events;
 
          <font color="navy"><b>public</b></font> <font color="navy"><b>void</b></font> fireEvent() <font color="navy">{</font>
               <font color="darkgreen">//implementation</font>
               ReceivedEvent e = <font color="navy"><b>new</b></font> ReceivedEvent(stringList);
               event.fire(e);
          <font color="navy">}</font>
<font color="navy">}</font>
 
<font color="navy"><b>public</b></font> <font color="navy"><b>class</b></font> ReceivedEvent  <font color="navy">{</font>
 
          <font color="navy"><b>private</b></font> List<String> stringList;
 
          <font color="navy"><b>public</b></font> ReceivedEvent(<font color="navy"><b>final</b></font> List<String> stringList) <font color="navy">{</font>
                    this.stringList= stringList;
          <font color="navy">}</font>
 
 
          <font color="navy"><b>public</b></font> List<String> getStrings() <font color="navy">{</font>
                    <font color="navy"><b>return</b></font> stringList;
          <font color="navy">}</font>
<font color="navy">}</font>
 
</code></pre><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Currently, when on BeanB the event is fired at BeanA nothing happens. My question now is: is the Observer Pattern the correct pattern in this case? Did I forgot something in this sample why the BeanA does not gets the event? Is the Observer Pattern made for event communication between two differen EJB-JARs? </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Thanks</p></div>
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<p style="margin: 0;">Reply to this message by <a href="https://community.jboss.org/message/783044#783044">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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