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jBPM 4 - Deploy only if ProcessDefinition changed or new
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created by <a href="http://community.jboss.org/people/rapa">rapa</a> in <i>jBPM</i> - <a href="http://community.jboss.org/message/570056#570056">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 successfully integrated jBPM 4.4 with Seam 2.2, running on JBoss 4.2. </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>In my overridden Jbpm class I deploy all process definitions, which are got from the components.xml </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><pre class="jive-pre"><code class="jive-code jive-xml">
   <span class="jive-xml-tag"><bpm:jbpm></span>
        <span class="jive-xml-tag"><bpm:process-definitions></span>
            <span class="jive-xml-tag"><value></span>bpm/processdefinitions/process_1.jpdl.xml<span class="jive-xml-tag"></value></span>
            <span class="jive-xml-tag"><value></span>bpm/processdefinitions/process_2.jpdl.xml<span class="jive-xml-tag"></value></span>
            <span class="jive-xml-tag"><value></span>bpm/processdefinitions/process_3.jpdl.xml<span class="jive-xml-tag"></value></span>        <span class="jive-xml-tag"></bpm:process-definitions></span>
    <span class="jive-xml-tag"></bpm:jbpm></span>
</code></pre><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><div id="_mcePaste" style="position: absolute; left: -10000px; top: 0px; width: 1px; height: 1px; overflow-x: hidden; overflow-y: hidden;">    <bpm:jbpm></div><div id="_mcePaste" style="position: absolute; left: -10000px; top: 0px; width: 1px; height: 1px; overflow-x: hidden; overflow-y: hidden;">        <bpm:process-definitions></div><div id="_mcePaste" style="position: absolute; left: -10000px; top: 0px; width: 1px; height: 1px; overflow-x: hidden; overflow-y: hidden;">            <value>bpm/processdefinitions/partner_registration.jpdl.xml</value></div><div id="_mcePaste" style="position: absolute; left: -10000px; top: 0px; width: 1px; height: 1px; overflow-x: hidden; overflow-y: hidden;">        </bpm:process-definitions></div><div id="_mcePaste" style="position: absolute; left: -10000px; top: 0px; width: 1px; height: 1px; overflow-x: hidden; overflow-y: hidden;">    </bpm:jbpm></div><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>The process definitions file paths (resource names) are automatically injected in the String[] processDefinitions array (see Jbpm class)</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>By having all file paths it is easy to deploy  the process definitions through the repository service, but I would like to avoid to deploy them each time</p><p>I restart my application server.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>What I would like to do is to deploy my process definitions only if the xml file is new or has been modified since it's last deployment. The idea is simple: I just compare the last deployed process definition's xml content with the one of the current process definition.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>There is a method in the repository service that allows to get the deployed process definition's xml content</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><pre class="jive-pre"><code class="jive-code jive-java">repositoryService.getResourceAsStream(deploymentId, resourceName);
</code></pre><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I see that the jbpm4_lob table is the one that contains all the required data (resource_names, deployment_ids, xml files contents), so there must be</p><p>a way to retrieve what I need.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>The problem is that I looked into the jbpm 4.4 api and I don't see any way to retrieve the highest deploymentId for a given resource name. The only way is to use the process definition key or name, but I would have to map these manually somewhere to their resource name or parse the xml files, which would be very nasty and I absolutely want to avoid that.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Here is the code of my Jbpm class.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><pre class="jive-pre"><code class="jive-code jive-java">@Name(<font color="red">"jbpm"</font>)
@Scope(ScopeType.APPLICATION)
@AutoCreate
@Startup
@BypassInterceptors
@Install(precedence = Install.APPLICATION)
<font color="navy"><b>public</b></font> <font color="navy"><b>class</b></font> Jbpm <font color="navy"><b>extends</b></font> SeamComponent <font color="navy">{</font>
     
    @Getter
    <font color="navy"><b>private</b></font> ProcessEngine processEngine;
    @Getter @Setter
    <font color="navy"><b>private</b></font> String[] processDefinitions;
   
    @Create
    <font color="navy"><b>public</b></font> <font color="navy"><b>void</b></font> init() <font color="navy">{</font>
       <font color="darkgreen">// ...</font>
 
       deployProcessDefinitions();
 
       <font color="darkgreen">// ...</font>
    <font color="navy">}</font>
 
   <font color="darkgreen">/**
     * Deploys all changed or new process definitions.
     */</font>
    <font color="navy"><b>private</b></font> <font color="navy"><b>void</b></font> deployProcessDefinitions() <font color="navy">{</font>
       
      RepositoryService repositoryService = this.processEngine.getRepositoryService();
      <font color="navy"><b>for</b></font> (String processDefinition : this.processDefinitions) <font color="navy">{</font>
 
           <font color="darkgreen">// deploy d only if new or it has changed</font>
           <font color="navy"><b>if</b></font>(isNewOrChanged(processDefinition)) <font color="navy">{</font>
              NewDeployment d = repositoryService.createDeployment()
                                    .addResourceFromClasspath(processDefinition);
              String newDeploymentId = d.deploy();
           <font color="navy">}</font>
 
      <font color="navy">}</font>
 
      <font color="navy"><b>private</b></font> String isNewOrChanged(processDefinition) <font color="navy">{</font>
 
          <font color="darkgreen">// how to get deploymentId???</font>
 
          InputStream is = repositoryService.getResourceAsStream(deploymentId, processDefinition);
          String xml = convertStreamToString(is);
 
          <font color="darkgreen">// ...</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>Anyone has a solution for this?</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Thanks, cheers!</p></div>
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