Persistent search with spring ldap

[GeneL]

I would like to do a persistent search with spring ldap. In other words, I would like to be notified when a change occurs in a specified subtree. I can do this function with novell ldap kit. Can it be done with spring ldap? Please give some code examples it is possible.

Thank you.

[ulsa]

Persistent search in JNDI is based on event listeners that are registered using an EventDirContext. You could try something like this:

   public void testPersistentSearch() throws Exception {
      final SearchControls searchControls = new SearchControls();
      searchControls.setSearchScope(SearchControls.SUBTREE_SCOPE);

      ContextExecutor contextExecutor = new ContextExecutor() {
         public Object executeWithContext(DirContext ctx) throws NamingException {
            EventDirContext ectx = (EventDirContext) ctx.lookup("");
            ectx.addNamingListener("", "(cn=*)", searchControls, new MyEventListener("listener_1"));
            return null;
         }
      };
      ldapTemplate.executeReadOnly(contextExecutor);

      // test the listener
      ldapTemplate.unbind("cn=Some Person99,ou=company1,c=Sweden");
   }

where MyEventlistener looks like this:

   /**
    * MyEventlistener class An instance of this class is registered with an
    * EventDirContext object. The registered instance's NamespaceChangeListener
    * interface methods are called when a pertinent event occurs.
    */
   private static class MyEventListener implements NamespaceChangeListener, ObjectChangeListener {
      private String id;

      public MyEventListener(String id) {
         this.id = id;
      }

      public void objectAdded(NamingEvent evt) {
         System.out.println("\n\n" + id + ">>> object added event. Object Name: " + evt.getNewBinding().getName());
      }

      public void objectRemoved(NamingEvent evt) {
         System.out.println("\n\n" + id + ">>> object removed event. Object Name: " + evt.getOldBinding().getName());
      }

      public void objectRenamed(NamingEvent evt) {
         System.out.println("\n\n" + id + ">>> object renamed event. New name: " + evt.getNewBinding().getName()
               + " Old name: " + evt.getOldBinding().getName());
      }

      public void objectChanged(NamingEvent evt) {
         System.out.println("\n\n" + id + ">>> object changed event. Object name: " + evt.getNewBinding().getName());
      }

      public void namingExceptionThrown(NamingExceptionEvent evt) {
         System.out.println("\n\n" + id + ">>> Listener received a naming exception");
         evt.getException().printStackTrace();
      }
   }

[GeneL]

Thank you.

I tried this code, but I have a runtime cast problem:

java.lang.ClassCastException: org.springframework.ldap.core.DirContextAdapter cannot be cast to javax.naming.event.EventDirContext
at LdapConnectorTest$1.executeWithContext(LdapConnect orTest.java:27)
at org.springframework.ldap.core.LdapTemplate.execute WithContext(LdapTemplate.java:784)
at org.springframework.ldap.core.LdapTemplate.execute ReadOnly(LdapTemplate.java:771)
at LdapConnectorTest.testGetAllAgentNames(LdapConnect orTest.java:40)
at LdapConnectorTest.main(LdapConnectorTest.java:81)

For the code:

final SearchControls searchControls = new SearchControls();
searchControls.setSearchScope(SearchControls.SUBTR EE_SCOPE);

ContextExecutor contextExecutor = new ContextExecutor() {
public Object executeWithContext(DirContext ctx) throws NamingException {
EventDirContext ectx = (EventDirContext) ctx.lookup("");
ectx.addNamingListener("", "(objectClass=*)", searchControls, new MyEventListener("listener_1"));
return null;
}
};

The problem line is:

EventDirContext ectx = (EventDirContext) ctx.lookup("");

What am I doing wrong?

[ulsa]

By default, all results are converted to a DirContextAdapter using the dirObjectFactory property of the ContextSource. You need to disable that, which can be done in XML using the null element:

<bean id="contextSource" 
      class="org.springframework.ldap.core.support.LdapContextSource" >
   ...
   <property name="dirObjectFactory">
      <null />
   </property>
</bean>

[GeneL]

Is there a way to do it in Java?

[ulsa]

((AbstractContextSource) ldapTemplate.getContextSource()).setDirObjectFactory(null);

[GeneL]

It works.

Thank you.

[GeneL]

How can I extract changed attributes in changed entries?