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Re: Number of stateless beans
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created by <a href="http://community.jboss.org/people/piotrekde">piotrekde</a> in <i>Beginner's Corner</i> - <a href="http://community.jboss.org/message/582853#582853">View the full discussion</a>
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<div class="jive-rendered-content"><p>I found that I can use org.jboss.ejb3.common.proxy.plugins.async.AsyncUtils in the following way:</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">@Stateful
<font color="navy"><b>public</b></font> <font color="navy"><b>class</b></font> ComputerBean <font color="navy"><b>implements</b></font> ComputerRemote <font color="navy">{</font>
 
    @EJB
    <font color="navy"><b>private</b></font> ProcessorLocal processor;
 
    <font color="navy"><b>public</b></font> <font color="navy"><b>void</b></font> startComputations() <font color="navy">{</font>
        Random r = <font color="navy"><b>new</b></font> Random();
        <font color="navy"><b>while</b></font>(<font color="navy"><b>true</b></font>) <font color="navy">{</font>
            AsyncUtils.mixinAsync(processor).compute(r.nextInt());
        <font color="navy">}</font>
    <font color="navy">}</font>
<font color="navy">}</font>
</code></pre><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Then it is possible to use Future interface to get result (when it will be ready). I tested it - works, but I have also noticed something strange. Let's consider following 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">@Stateless
<font color="navy"><b>public</b></font> <font color="navy"><b>class</b></font> ProcessorBean <font color="navy"><b>implements</b></font> ProcessorLocal <font color="navy">{</font>
 
    <font color="navy"><b>private</b></font> <font color="navy"><b>static</b></font> <font color="navy"><b>int</b></font> COUNTER = 0;
 
    @PostConstruct
    <font color="navy"><b>public</b></font> <font color="navy"><b>void</b></font> init() <font color="navy">{</font>
        System.out.println(<font color="red">"constructing"</font>);
        COUNTER++;
    <font color="navy">}</font>
 
    @PreDestroy
    <font color="navy"><b>public</b></font> <font color="navy"><b>void</b></font> destroy() <font color="navy">{</font>
        System.out.println(<font color="red">"destroying"</font>);
        COUNTER--;
    <font color="navy">}</font>
 
    <font color="navy"><b>public</b></font> <font color="navy"><b>void</b></font> compute(<font color="navy"><b>int</b></font> i) <font color="navy">{</font>
        System.out.println(<font color="red">"----------------> "</font> + COUNTER);
 
        <font color="darkgreen">// some dummy computations - it's here only in order to take some time</font>
        <font color="navy"><b>double</b></font> d = 0.3;
        <font color="navy"><b>for</b></font> (<font color="navy"><b>int</b></font> j=0; j<100; j++) <font color="navy">{</font>
            d+= 0.2 % 4 + i;
        <font color="navy">}</font>
    <font color="navy">}</font>
<font color="navy">}</font>
</code></pre><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Counter is increased and printed to the console - it looks as SLSB are pooled and their number is increased when needed. <br/>However, counter is _never_ decremented - even if I stop computations for 15 minutes and then restart it.</p><p>I would say that I expected that after some downtime number of pooled SLSB will go to some small number.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Is this something wrong with my code (some hold references etc.) ?</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Thanks,<br/>Piotr</p></div>
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