The following page describes the steps to include a new event handler for Grouper (not currently working, but hopefully not too far away...)

 package uk.ac.cardiff.model.event;

import uk.ac.cardiff.utility.EqualsUtil;
import uk.ac.cardiff.utility.HashCodeUtil;
import uk.ac.cardiff.utility.StringUtils;

/**
 * The Class GrouperAuthenticationEvent.
 * 
 */
public class GrouperAuthenticationEvent extends AuthenticationEvent {

    /**
     * The name of a field not included in any of the superclasses and specific to this event.
     */
    private String groupAction;
    private String groupUser;

    /**
     * Instantiates a new Generic Authentication Event.
     */
    public GrouperAuthenticationEvent() {
        super();
    }

    /**
     * New instance.
     * 
     * @return the Grouper Authentication Event
     */
    public static GrouperAuthenticationEvent newInstance() {
        return new GrouperAuthenticationEvent();
    }

    /**
     * Copy constructor.
     * 
     * @param event
     *            the event to copy
     */
    protected GrouperAuthenticationEvent(GrouperAuthenticationEvent event) {
        super(event);
        groupAction = event.getGroupAction();
        groupUser = event.getGroupUser();

    }

    /**
     * Copy method. Alternative to clone. Returns a copied version of this event.
     * 
     * @return the Grouper Authentication Event
     */
    public GrouperAuthenticationEvent copy() {
        return new GrouperAuthenticationEvent(this);
    }

    /**
     * 
     * @see java.lang.Object#equals(java.lang.Object)
     */
    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if ((obj == null) || (obj.getClass() != this.getClass()))
            return false;
        GenericAuthenticationEvent that = (GenericAuthenticationEvent) obj;
        boolean areEqual = EqualsUtil.areEqual(this.getEventTimeMillis(), that.getEventTimeMillis()) && EqualsUtil.areEqual(this.getEventId(), that.getEventId())
                && EqualsUtil.areEqual(this.getAuthenticationType(), that.getAuthenticationType()) && EqualsUtil.areEqual(this.getServiceHost(), that.getServiceHost())
                && EqualsUtil.areEqual(this.getResourceHost(), that.getResourceHost()) && EqualsUtil.areEqual(this.getPrincipalName(), that.getPrincipalName())
                && EqualsUtil.areEqual(this.getServiceId(), that.getServiceId()) && EqualsUtil.areEqual(this.getEventType(), that.getEventType())
                && EqualsUtil.areEqual(this.getResourceId(), that.getResourceId()) &&
                // all new fields should be included in the quality method under here.
                EqualsUtil.areEqual(this.getGroupUser(), that.getGroupUser()) && EqualsUtil.areEqual(this.getGroupAction(), that.getGroupAction()); 

        return areEqual;
    }

    /**
     * For hibernate, so the hashcode can be persisted.
     * 
     * @return the hash code
     */
    public int getHashCode() {
        return hashCode();
    }

    /**
     * For hibernate, does nothing as the hascode is computed on the fly from the <code>hashCode</code> method.
     * 
     * @param hashCode
     *            the new hash code
     */
    public void setHashCode(int hashCode) {

    }

    /**
     * create a unique hash, with as uniform a distribution as possible.
     * 
     * @return the int
     */
    @Override
    public int hashCode() {
        int hash = HashCodeUtil.SEED;
        // all inherited fields are hashed here.
        hash = HashCodeUtil.hash(hash, getEventTimeMillis());
        hash = HashCodeUtil.hash(hash, getAuthenticationType());
        hash = HashCodeUtil.hash(hash, getEventId());
        hash = HashCodeUtil.hash(hash, getServiceHost());
        hash = HashCodeUtil.hash(hash, getResourceHost());
        hash = HashCodeUtil.hash(hash, getPrincipalName());
        hash = HashCodeUtil.hash(hash, getEventType());
        hash = HashCodeUtil.hash(hash, getServiceId());
        hash = HashCodeUtil.hash(hash, getResourceId());
        // all new fields part of the business key should be hashed below.
        hash = HashCodeUtil.hash(hash, getGroupAction());
        hash = HashCodeUtil.hash(hash, getGroupUser());
        

        return hash;

    }

    /**
     * Automatic construction of a basic to string method for this class using reflection. Does not require modification unless different behavior is desired.
     */
    public String toString() {
        return StringUtils.buildToString(this);
    }

    /**
     * @param groupUser
     *            the groupUser to set
     */
    public void setGroupUser(String groupUser) {
        this.groupUser = groupUser;
    }

    /**
     * @return the groupUser
     */
    public String getGroupUser() {
        return groupUser;
    }
    
      /**
     * @param groupAction
     *            the groupAction to set
     */
    public void setGroupAction(String groupAction) {
        this.groupAction = groupAction;
    }

    /**
     * @return the groupUser
     */
    public String getGroupAction() {
        return groupAction;
    }

}

grouper log event handler