How to call the node-service when my AMP starts up?

[hbf]

Hi!

My AMP preloads some data (the country tags that are currently in use, to be precise). I've first implemented "lazy caching" in the sense that the data is loaded/fetched only when some code asks for it.

This does not work however, as some client code is asking for the data within an afterCommit() handler. The result is

13:29:01,257 User:admin ERROR [repo.transaction.AlfrescoTransactionSupport] After completion (committed) listener exception: 
   listener: org.myorg.module.myapp.service.MyService@c937c8
org.alfresco.error.AlfrescoRuntimeException: onCommit cache modifications are not allowed.
   at org.alfresco.repo.cache.TransactionalCache.put(TransactionalCache.java:398)
   at org.alfresco.repo.ownable.impl.OwnableServiceImpl.getOwner(OwnableServiceImpl.java:144)
   at org.alfresco.repo.security.permissions.dynamic.OwnerDynamicAuthority.hasAuthority(OwnerDynamicAuthority.java:58)
   at org.alfresco.repo.security.permissions.impl.PermissionServiceImpl.getAuthorisations(PermissionServiceImpl.java:447)
   at org.alfresco.repo.security.permissions.impl.PermissionServiceImpl.hasPermission(PermissionServiceImpl.java:345)
   at org.alfresco.repo.security.permissions.impl.PermissionServiceImpl.hasPermission(PermissionServiceImpl.java:577)
   at sun.reflect.GeneratedMethodAccessor266.invoke(Unknown Source)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
   at java.lang.reflect.Method.invoke(Method.java:585)
   at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:281)
   at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:187)
   at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:154)
   at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:107)
   at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:176)
   at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:210)
   at $Proxy14.hasPermission(Unknown Source)‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

Therefore my question: What is the easiest way to run a few queries against the nodeService after AMP startup? I tried to do it from within my init-method="init" bean initialization method, but it seems no transaction is set up at this point yet.

Thanks for any hint,
Kaspar

[claudio_martins]

Please post your configuration files and your java classes, so we can have a look and may help you.


Cheers, CM.

[hbf]

I've tried to isolate the problem a little further; here's the revised picture: I have an AMP (org.myorg.module.MyPackage) that preloads the category hierarchy for the countries (this is the standard "REGIONS" category hierarchy of Alfresco). I need to preload them because I need very fast access to them.

This AMP has the following configuration in my module's module-context.xml:

 <!– Instantiate the custom Service. –>
 <bean id="myService" class="org.myorg.module.MyPackage.service.MyService" init-method="init">
  <property name="serviceRegistry">
   <ref bean="ServiceRegistry" />
  </property>
  <property name="policyComponent">
   <ref bean="policyComponent" />
  </property>
  <property name="dirRoot">
   <value>${dir.root}</value>
  </property>
 </bean>‍‍‍‍‍‍‍‍‍‍‍‍

The class MyService has a method

  /**
   * Returns the list of all country categories. The first time you call this,
   * the list is actually fetched from the repository but cached afterwards, so that
   * subsequent calls are very fast.
   */
  public List<NodeRef> getCachedCountryHierarchy()
  {
    // …
    NodeRef tag = …;
    List<ChildAssociationRef> childAssocs = nodeService.getChildAssocs(tag); // (*)
    // …
  }‍‍‍‍‍‍‍‍‍‍‍‍

The important thing here is that this method calls NodeService's getChildAssocs() method.

Now comes the problem: Some *other* code uses my AMP and calls getCachedCountryHierarchy() from within a afterCommit() listener. If this is the first time (since Alfresco startup) that getCachedCountryHierarchy() gets called, the line (*) is executed, which results in the exception from the original post.

So it seems that I have to make sure that getCachedCountryHierarchy() is called after Alfresco startup. How can I do this?

I tried to do it in my service's init() method (see configuration above), by just calling getCachedCountryHierarchy() there. But at this point, no Alfresco transaction is set up and I get an authentication error, so I am wondering what the "standard" way is to perform tasks against the repository (queries in my case) after AMP startup. I think it's a general pattern that many AMPs will require, so I thought there's maybe a general way to do it…

Many thanks,
Kaspar

[andy]

Hi

Can you post the full stack trace to show how your code is getting called in the TX after commit. What is this "other" code?

Andy

[stijndereede]

I've got a sort of similar problem. I want to make sure that certain folders exist in the workspace, otherwise my module doesn't work correctly. So I'm looking for a way to execute some code after my module has been loaded when Alfresco starts.
The bean in my module-context.xml is:

   <bean id="module.cayman" class="org.alfresco.module.cayman.Main" parent="module.baseComponent" init-method="init">
      <property name="nodeService">
         <ref bean="NodeService" />
      </property>      
   </bean>
‍‍‍‍‍‍‍

(Do I actually need to extend baseComponent?)
And the cayman.Main class is:

public class Main extends AbstractModuleComponent {
   private NodeService nodeService;
   public void setNodeService(NodeService nodeService) {
      this.nodeService = nodeService;
   }

   public void init() {
      System.out.println("Init of Cayman module");
      logger.debug("Init of Cayman module");
      
      StoreRef storeRef = new StoreRef(StoreRef.PROTOCOL_WORKSPACE, "SpacesStore");
      NodeRef ref1 = new NodeRef(storeRef, "/app:company_home/cm:Cayman");
      System.out.println(nodeService.exists(ref1));
   }
}
‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

Without the nodeService call the init() method gets executed, but with it I get:

17:53:58,241 ERROR [org.springframework.web.context.ContextLoader] Context initialization failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'module.cayman' defined in file [D:\alfresco\tomcat\webapps\alfresco\WEB-INF\classes\alfresco\module\cayman\module-context.xml]: Invocation of init method failed; nested exception is net.sf.acegisecurity.AuthenticationCredentialsNotFoundException: A valid SecureContext was not provided in the RequestContext
Caused by: net.sf.acegisecurity.AuthenticationCredentialsNotFoundException: A valid SecureContext was not provided in the RequestContext
   at net.sf.acegisecurity.intercept.AbstractSecurityInterceptor.credentialsNotFound(AbstractSecurityInterceptor.java:477)
   at net.sf.acegisecurity.intercept.AbstractSecurityInterceptor.beforeInvocation(AbstractSecurityInterceptor.java:355)
   at net.sf.acegisecurity.intercept.method.aopalliance.MethodSecurityInterceptor.invoke(MethodSecurityInterceptor.java:77)

(and so on…)
‍‍‍‍‍‍‍‍‍‍

See also my other post: http://forums.alfresco.com/viewtopic.php?t=11304

Regards,

Stijn


BTW: what is the correct (simple) way to check if a folder exists in the spacesstore if you know the path? Would the above actually work?