OPENDJ-2655 Optimize Group implementations by lazily creating examined groups

Nicolas Capponi

17.22.2016 a381819e25430ccca6f3d5645d7422d1dda97c1c

 opendj-server-legacy/src/main/java/org/opends/server/extensions/VirtualStaticGroup.java

@@ -17,8 +17,10 @@
package org.opends.server.extensions;

import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.concurrent.atomic.AtomicReference;

import org.forgerock.i18n.LocalizableMessage;
import org.forgerock.i18n.LocalizedIllegalArgumentException;
@@ -216,10 +218,11 @@
  }

  @Override
  public boolean isMember(DN userDN, Set<DN> examinedGroups)
  public boolean isMember(DN userDN, AtomicReference<Set<DN>> examinedGroups)
         throws DirectoryException
  {
    if (! examinedGroups.add(getGroupDN()))
    Set<DN> groups = getExaminedGroups(examinedGroups);
    if (! groups.add(getGroupDN()))
    {
      return false;
    }
@@ -243,10 +246,11 @@
  }

  @Override
  public boolean isMember(Entry userEntry, Set<DN> examinedGroups)
  public boolean isMember(Entry userEntry, AtomicReference<Set<DN>> examinedGroups)
         throws DirectoryException
  {
    if (! examinedGroups.add(getGroupDN()))
    Set<DN> groups = getExaminedGroups(examinedGroups);
    if (! groups.add(getGroupDN()))
    {
      return false;
    }
@@ -269,6 +273,17 @@
    }
  }

  private Set<DN> getExaminedGroups(AtomicReference<Set<DN>> examinedGroups)
  {
    Set<DN> groups = examinedGroups.get();
    if (groups == null)
    {
      groups = new HashSet<DN>();
      examinedGroups.set(groups);
    }
    return groups;
  }

  @Override
  public MemberList getMembers()
         throws DirectoryException