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Getting Service Resource Resolver in AEM 6 [Copied from Code lit]



From AEM 6 usage of admin session and admin resource resolver have been deprecated. Now we should use service resource resolver API to retrieve the session. Below are the steps
Creating System users
2.      Click on user administration
3.      Click on create system user
4.      Enter user id.
 
You can create any number of system users based on your requirement. A typical use case is to have two separate system users, one for read operation and another for write. You may want to further sub categorize and create role oriented users. Once system users are created, assign them permission according to their roles or categories.
Assign user mapping
1.      Go to felix bundle console
2.      Find org.apache.sling.serviceusermapping.impl.ServiceUserMapperImpl configuration
3.      Add a new entry in below format –
4.      bundleId:subserviceName = systemUser
5.      Write a service which uses above configuration to return session.
 
Below is the service API code which uses "readSubService" and "writeSubService" and provides separate methods for retrieving ResourceResolver and JcrSession

SessionService.java
 
package com.test.aem.session.service.api;
import javax.jcr.Session;
import org.apache.sling.api.resource.LoginException;
import org.apache.sling.api.resource.ResourceResolver;
 
/**
 * Wrapper API for ResourceResolverFactory/ResourceResolver for retrieving JCR session
 * @author gdagur
 *
 */
public interface SessionService {
               /**
                * Method retrieves Service Resource resolver with write access
                * @return ResourceResolver
                * @throws LoginException
                */
               public ResourceResolver getWriteServiceResourceResolver() throws LoginException;
               /**
                *  Method retrieves Service Resource resolver with read access
                * @return
                * @throws LoginException
                */
               public ResourceResolver getReadServiceResourceResolver() throws LoginException;
               /**
                *  Method retrieves JCR Session with write access
                * @return
                * @throws LoginException
                */
               public Session getReadJcrSession() throws LoginException;
               /**
                *  Method retrieves JCR session with write access
                * @return
                * @throws LoginException
                */
               public Session getWriteJcrSession() throws LoginException;
              
}
 
 
SessionServiceImpl.java
 
package com.test.aem.session.service.impl;
 
import java.util.HashMap;
import java.util.Map;
import javax.jcr.Session;
import org.apache.felix.scr.annotations.Component;
import org.apache.felix.scr.annotations.Reference;
import org.apache.felix.scr.annotations.Service;
import org.apache.sling.api.resource.LoginException;
import org.apache.sling.api.resource.ResourceResolver;
import org.apache.sling.api.resource.ResourceResolverFactory;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
 
import com.test.aem.session.service.api.*;
@Component(immediate=true, metatype = true, label = "test Session Service", name = "SessionServiceImpl" )
@Service(value = SessionService.class)
public class SessionServiceImpl implements SessionService{
               /**
                * Resource resolver factory object to retrieve session
                */
               @Reference
               ResourceResolverFactory rrFactory;
               /**
                * Logger object
                */
               private static final Logger LOGGER = LoggerFactory.getLogger(SessionServiceImpl.class);
               /**
                * Read Service System user
                */
               private static final String READ_SUB_SERVICE = "readSubService";
               /**
                * Write Service System user
                */
               private static final String WRITE_SUB_SERVICE = "writeSubService";
 
               /*
                * (non-Javadoc)
                * @see com.test.aem.session.service.api.SessionService#getReadServiceResourceResolver()
                */
               public ResourceResolver getReadServiceResourceResolver() throws LoginException{
                              Map<String, Object> param = new HashMap<String, Object>();
                              param.put(ResourceResolverFactory.SUBSERVICE, READ_SUB_SERVICE);
                              LOGGER.debug("Getting Read access serviceResourceResolver for param {}", param);
                              return rrFactory.getServiceResourceResolver(param);
               }
               /*
                * (non-Javadoc)
                * @see com.test.aem.session.service.api.SessionService#getWriteServiceResourceResolver()
                */
               public ResourceResolver getWriteServiceResourceResolver() throws LoginException{
                              Map<String, Object> param = new HashMap<String, Object>();
                              param.put(ResourceResolverFactory.SUBSERVICE, WRITE_SUB_SERVICE);
                              LOGGER.debug("Getting Write access serviceResourceResolver for param {}", param);
                              return rrFactory.getServiceResourceResolver(param);
               }
               /*
                * (non-Javadoc)
                * @see com.test.aem.session.service.api.SessionService#getReadJcrSession()
                */
               public Session getReadJcrSession() throws LoginException{
                              ResourceResolver resolver = getReadServiceResourceResolver();
                              Session session = null;
                              if(null != resolver){
                                             session =  resolver.adaptTo(Session.class);
                              }
                              return session;
               }
               /*
                * (non-Javadoc)
                * @see com.test.aem.session.service.api.SessionService#getWriteJcrSession()
                */
               public Session getWriteJcrSession() throws LoginException{
                              ResourceResolver resolver = getWriteServiceResourceResolver();
                              Session session = null;
                              if(null != resolver){
                                             session =  resolver.adaptTo(Session.class);
                              }
                              return session;
               }
 
}

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