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package com.sun.enterprise.admin.event;

//i18n import
import com.sun.enterprise.util.i18n.StringManager;

/**
 * EjbTimerEvent - emitted by DAS to send requests to Ejb Timer Service
 * Attibutes: actionType, from, servers
 */
public class EjbTimerEvent extends AdminEvent implements CommandEvent {

    /**
     * Attribute name in EventResult to return results of calls to timer service
     */
    public static final String EJB_TIMER_CALL_RESULT_ATTRNAME = "ejb_timer_call_result";

    /**
     * Constant denoting action code 
     */
    public static final int ACTION_MIGRATETIMER  = 1;
    public static final int ACTION_LISTTIMERS    = 2;

    /**
     * Event type
     */
    static final String eventType = EjbTimerEvent.class.getName();

    /**
     * Attributes ()
     */
    private int      actionType;
    private String   from;
    private String[] servers;

    // i18n StringManager
    private static StringManager localStrings = StringManager.getManager( EjbTimerEvent.class );

    /**
     * Create a new EjbTimerEvent.
     * @param instance name of the instance to which the event applies
     * @param realm name of the AuthRealm on which event happened.
     * @param action type of action - one of EjbTimerEvent.ACTION_MIGRATETIMER,
     *        EjbTimerEvent.ACTION_LISTTIMERS
     * @param serverFrom  name of server instance (for ACTION_MIGRATETIMER) 
     * @param serverNames names of server instances (for ACTION_LISTTIMERS)
     * @throws IllegalArgumentException if specified action is not valid
     */
    public EjbTimerEvent(String instance, int action, String serverFrom, String[] serverNames) {
        this(eventType, instance, action, serverFrom, serverNames);
    }

    /**
     * Create a new EjbTimerEvent.
     * @param type event type, a string representation for the event
     * @param action type of action - one of EjbTimerEvent.ACTION_MIGRATETIMER,
     *        EjbTimerEvent.ACTION_LISTTIMERS
     * @param serverFrom  name of server instance (for ACTION_MIGRATETIMER) 
     * @param serverNames names of server instances (for ACTION_LISTTIMERS)
     * @throws IllegalArgumentException if specified action is not valid
     */
    public EjbTimerEvent(String type, String instance, int action, String serverFrom, String[] serverNames) {
        super(type, instance);
        from = serverFrom;
        servers  = serverNames;
        setAction(action);
    }

    /**
     * Get from param
     */
    public String getFromServerName() {
        return from;
    }

    /**
     * Get servers param
     */
    public String[] getServerNames() {
        return servers;
    }

    /**
     * Get action type for this event.
     */
    public int getActionType() {
        return actionType;
    }

    /**
     * Set action to specified value. If action is not one of allowed,
     * then IllegalArgumentException is thrown.
     * @throws IllegalArgumentException if action is invalid
     */
    private void setAction(int action) {
        boolean valid = false;
        if (action==ACTION_MIGRATETIMER      ||
            action==ACTION_LISTTIMERS )
            valid = true;
        if (!valid) {
			String msg = localStrings.getString( "admin.event.invalid_action", ""+action );
            throw new IllegalArgumentException( msg );
        }
        this.actionType = action;
    }
   
}