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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 *
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019
020 package org.apache.james.jspf.executor;
021
022 import org.apache.james.jspf.core.DNSLookupContinuation;
023 import org.apache.james.jspf.core.DNSResponse;
024 import org.apache.james.jspf.core.DNSService;
025 import org.apache.james.jspf.core.Logger;
026 import org.apache.james.jspf.core.SPFChecker;
027 import org.apache.james.jspf.core.SPFCheckerExceptionCatcher;
028 import org.apache.james.jspf.core.SPFSession;
029 import org.apache.james.jspf.core.exceptions.SPFResultException;
030 import org.apache.james.jspf.core.exceptions.TimeoutException;
031
032 /**
033 * Synchronous implementation of SPFExecuter. All queries will get executed synchronously
034 */
035 public class SynchronousSPFExecutor implements SPFExecutor {
036
037 private Logger log;
038 private DNSService dnsProbe;
039
040 public SynchronousSPFExecutor(Logger log, DNSService service) {
041 this.log = log;
042 this.dnsProbe = service;
043 }
044
045 /**
046 * @see org.apache.james.jspf.executor.SPFExecutor#execute(org.apache.james.jspf.core.SPFSession, org.apache.james.jspf.executor.FutureSPFResult)
047 */
048 public void execute(SPFSession session, FutureSPFResult result) {
049 SPFChecker checker;
050 while ((checker = session.popChecker()) != null) {
051 // only execute checkers we added (better recursivity)
052 log.debug("Executing checker: " + checker);
053 try {
054 DNSLookupContinuation cont = checker.checkSPF(session);
055 // if the checker returns a continuation we return it
056 while (cont != null) {
057 DNSResponse response;
058 try {
059 response = new DNSResponse(dnsProbe.getRecords(cont
060 .getRequest()));
061 } catch (TimeoutException e) {
062 response = new DNSResponse(e);
063 }
064 cont = cont.getListener().onDNSResponse(response, session);
065 }
066 } catch (Exception e) {
067 while (e != null) {
068 while (checker == null || !(checker instanceof SPFCheckerExceptionCatcher)) {
069 checker = session.popChecker();
070 }
071 try {
072 ((SPFCheckerExceptionCatcher) checker).onException(e, session);
073 e = null;
074 } catch (SPFResultException ex) {
075 e = ex;
076 } finally {
077 checker = null;
078 }
079 }
080 }
081 }
082 result.setSPFResult(session);
083 }
084
085 }