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...
public void init(DirectoryService core) throws Exception {
                        
  // Create LDAP DN
  suffixDn = new LdapDN(suffix);
  suffixDn.normalize(core.getRegistries().getAttributeTypeRegistry().getNormalizerMapping());
  Rdn rdn = suffixDn.getRdn();
        
  // Create the only entry in this partition
  ServerEntry entry = new DefaultServerEntry(core
          .getRegistries(), this.suffixDn);
  entry.put(SchemaConstants.OBJECT_CLASS_AT, SchemaConstants.TOP_OC,
                SchemaConstants.ORGANIZATIONAL_UNIT_OC);        
  entry.put(SchemaConstants.OU_AT, rdn.getUpValue().toString());
  entry.put("description", "hello, world", "a minimal partition");
        
  this.helloEntry = entry;
}
...
{code:java}

The _Partition_interface requires to implement many methods for all the operations a partition should support (adding, deleting, modifying entries ...). Due to the fact, that this is a readonly partition, the implementation in our case is minimalistic. Here is the _add_ method as an example.

{code:java}
...
public void delete(DeleteOperationContext opContext)
        throws LdapOperationNotSupportedException {
    throw new LdapOperationNotSupportedException(
            MODIFICATION_NOT_ALLOWED_MSG, ResultCodeEnum.UNWILLING_TO_PERFORM);
}
...
{code:java}

TBD: search

h3. Using the partition

h4. Embedded mode

{code:java}

package org.apache.directory.samples.partition.hello;

import org.apache.directory.server.core.DefaultDirectoryService;
import org.apache.directory.server.core.DirectoryService;
import org.apache.directory.server.ldap.LdapService;
import org.apache.directory.server.protocol.shared.SocketAcceptor;

public class Main {

    public static void main(String[] args) throws Exception {
        DirectoryService directoryService;

        SocketAcceptor socketAcceptor;
        LdapService ldapService;

        directoryService = new DefaultDirectoryService();
        directoryService.setShutdownHookEnabled(true);

        socketAcceptor = new SocketAcceptor(null);
        ldapService = new LdapService();
        ldapService.setSocketAcceptor(socketAcceptor);
        ldapService.setDirectoryService(directoryService);
        ldapService.setIpPort(10389);

        HelloWorldPartition helloPartition = new HelloWorldPartition();
        helloPartition.setSuffix("ou=helloWorld");
        helloPartition.init(directoryService);
        
        directoryService.addPartition(helloPartition);       
        
        directoryService.startup();
        ldapService.start();
    }
}