Show DNSService.java syntax highlighted
/** (C) Copyright 1998-2004 Hewlett-Packard Development Company, LP
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
For more information: www.smartfrog.org
*/
package org.smartfrog.services.dns;
import org.xbill.DNS.Resolver;
/**
* A client interface to a service class registered in DNS, for which we can
* find a set of instances currently registered.
*
*
*
*/
public interface DNSService {
/**
* Performs a look-up of the registered service class using
* a particular resolver and filtering according to a given
* criteria. Matching instances are returned in decreasing
* priority. Multiple requests could return different results
* since the available instances or priorities could change
* dynamically.
*
* @param resol A network connection to resolve the query.
* @param filter An extra filtering function to be applied to the
* results or null if no extra filtering is required.
* @return An array of service instances matching the criteria
* and in decreasing priority or an array of lenght zero if
* no services found.
* @exception DNSException if an error occurs while looking up.
*/
public DNSServiceInstance[] lookup(Resolver resol,
DNSServiceFilter filter)
throws DNSException;
}
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