CMIS Change Log Token problem using OpenCMIS

gregbpopstar — Mon, 28 Mar 2011 17:58:12 GMT

I'm successfully opening an OpenCMIS "Session" to Alfresco 3.4.b and getting a list of change log changes to support a sync operation.The relevant code looks kinda like this:ChangeEvents changes = session.getContentChanges(getLastToken(), true, 1000);String newToken = changes.getLatestChangeLogToken

Re: CMIS Change Log Token problem using OpenCMIS

fmui — Tue, 29 Mar 2011 15:24:04 GMT

You are probably using the AtomPub binding. It doesn't return a change log token. That's a binding limitation, not an Alfresco limitation.

You either have to switch to Web Services or you have to do something ugly like this:

RepositoryInfo ri = session.getBinding().getRepositoryService().getRepositoryInfo(session.getRepositoryInfo().getId(), null);
String latestChangeLogToken = ri.getLatestChangeLogToken();‍‍

- Florian

Re: CMIS Change Log Token problem using OpenCMIS

gregbpopstar — Wed, 30 Mar 2011 00:16:33 GMT

Thanks Florian.

When I use your "ugly solution", I get a token which is not null. That's progress!

Re: CMIS Change Log Token problem using OpenCMIS

keesvanbemmel — Tue, 07 May 2013 07:48:00 GMT

Hi,

I've tried getting changes (iteratively) from the repository… but I think I fail to understand the logic behind it. I thought it would work like this:

1. Get the changes from the repo using "null" token
2. This returns the changes as well as a new token
3. Process the changes
4. Get new changes using new token (because I don't want to process the same changes again of course)
5. rinse and repeat from 2

However, the test code below shows that the returned change token in the changes is always the same as the one that was passed?? Any idea why and how I should process changes??

By the way, the tokens that are returned using webservice calls are identical to the ones gotten from atompub binding.

Regards,

Kees.

OUTPUT:
<blockquote>
token: null total numbers: 33
New changes token: null
token: 27 total numbers: 7
New changes token: 27
token: 28 total numbers: 5
New changes token: 29
token: 29 total numbers: 6
New changes token: 28
token: 33 total numbers: 1
New changes token: 33
</blockquote>

CODE:


import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.logging.Level;

import org.apache.chemistry.opencmis.client.api.ChangeEvents;
import org.apache.chemistry.opencmis.client.api.Session;
import org.apache.chemistry.opencmis.client.api.SessionFactory;
import org.apache.chemistry.opencmis.client.bindings.CmisBindingFactory;
import org.apache.chemistry.opencmis.client.runtime.SessionFactoryImpl;
import org.apache.chemistry.opencmis.commons.SessionParameter;
import org.apache.chemistry.opencmis.commons.data.RepositoryInfo;
import org.apache.chemistry.opencmis.commons.enums.BindingType;
import org.apache.chemistry.opencmis.commons.spi.CmisBinding;

public class TempTest {

   /**
    * @param args
    */
   public static void main(String[] args) {
      final CmisBinding binding;
      final Session session;
      final Session websession;
      String repositoryId;
      String url = "http://10.20.1.110:8080/alfresco/cmisatom";

      // holder for the parameters
      final Map<String, String> parameters = new HashMap<String, String>();

      // User credentials.
      parameters.put(SessionParameter.USER, "admin");
      parameters.put(SessionParameter.PASSWORD, "admin");
      // Connection settings.
      parameters.put(SessionParameter.ATOMPUB_URL, url);
      // type of binding
      parameters.put(SessionParameter.BINDING_TYPE,
            BindingType.ATOMPUB.value());
      try {
            // no repositoryId is set so first make a binding to fetch
            // the
            // first repository in the list
            binding = CmisBindingFactory.newInstance()
                  .createCmisAtomPubBinding(parameters);
            // if there is no binding no use to get on
            if (binding != null) {
               final List<RepositoryInfo> infos = binding
                     .getRepositoryService()
                     .getRepositoryInfos(null);
               if (!infos.isEmpty()) {
                  final RepositoryInfo repInfo = infos.get(0);
                  // now we have the repository and use it as a
                  // parameter
                  // to create the session
                  repositoryId = repInfo.getId();
                  parameters.put(SessionParameter.REPOSITORY_ID,
                        repositoryId);
               } else {
                  System.out.println("No repository found!");
               }
            } else {
               System.out.println("Given credentials are probably not correct!");
            }
         final SessionFactory sessionFactory = SessionFactoryImpl
               .newInstance();
         session = sessionFactory.createSession(parameters);
         
         RepositoryInfo ri = session.getBinding().getRepositoryService().getRepositoryInfo(session.getRepositoryInfo().getId(), null);
         String latestChangeLogToken = ri.getLatestChangeLogToken();
         ChangeEvents changes = session.getContentChanges(null, true, 1000);
         System.out.println("token: " + null + " total numbers: " +changes.getChangeEvents().size());
         System.out.println("New changes token: " + changes.getLatestChangeLogToken());
         changes = session.getContentChanges("27", true, 1000);
         System.out.println("token: " +"27" + " total numbers: " +changes.getChangeEvents().size());
         System.out.println("New changes token: " + changes.getLatestChangeLogToken());
         changes = session.getContentChanges("29", true, 1000);
         System.out.println("token: " +"28" + " total numbers: " +changes.getChangeEvents().size());
         System.out.println("New changes token: " + changes.getLatestChangeLogToken());
         changes = session.getContentChanges("28", true, 1000);
         System.out.println("token: " +"29" + " total numbers: " +changes.getChangeEvents().size());
         System.out.println("New changes token: " + changes.getLatestChangeLogToken());
         changes = session.getContentChanges(latestChangeLogToken, true, 1000);
         System.out.println("token: " +latestChangeLogToken + " total numbers: " +changes.getChangeEvents().size());
         System.out.println("New changes token: " + changes.getLatestChangeLogToken());
      } catch (final Exception e) {
         System.out.println("Given credentials are probably not correct! ");
         e.printStackTrace();
      }

   }

}
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CMIS Change Log Token problem using OpenCMIS

Re: CMIS Change Log Token problem using OpenCMIS

Re: CMIS Change Log Token problem using OpenCMIS

Re: CMIS Change Log Token problem using OpenCMIS