001 /**************************************************************** 002 * Licensed to the Apache Software Foundation (ASF) under one * 003 * or more contributor license agreements. See the NOTICE file * 004 * distributed with this work for additional information * 005 * regarding copyright ownership. The ASF licenses this file * 006 * to you under the Apache License, Version 2.0 (the * 007 * "License"); you may not use this file except in compliance * 008 * with the License. You may obtain a copy of the License at * 009 * * 010 * http://www.apache.org/licenses/LICENSE-2.0 * 011 * * 012 * Unless required by applicable law or agreed to in writing, * 013 * software distributed under the License is distributed on an * 014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY * 015 * KIND, either express or implied. See the License for the * 016 * specific language governing permissions and limitations * 017 * under the License. * 018 ****************************************************************/ 019 020 package org.apache.james.jspf.core; 021 022 import org.apache.james.jspf.core.exceptions.TimeoutException; 023 024 import java.util.List; 025 026 /** 027 * Interface which should be used to access all necassary DNS-Records 028 * 029 */ 030 public interface DNSService { 031 032 /** 033 * Retrieve dns records for the given host 034 * 035 * @param request the dns request 036 * @return an array of Strings representing the records 037 * @throws TimeoutException 038 */ 039 public List<String> getRecords(DNSRequest request) throws TimeoutException; 040 041 /** 042 * Try to get all domain names for the running host 043 * 044 * @return names A List contains all domain names which could resolved 045 */ 046 public List<String> getLocalDomainNames(); 047 048 /** 049 * Set the timeout for DNS-Requests 050 * 051 * @param timeOut The timeout in seconds 052 */ 053 public void setTimeOut(int timeOut); 054 055 /** 056 * @return the current record limit 057 */ 058 public int getRecordLimit(); 059 060 /** 061 * Sets a new limit for the number of records for MX and PTR lookups. 062 * 063 * @param recordLimit the new limit (0 => unlimited) 064 */ 065 public void setRecordLimit(int recordLimit); 066 067 }