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002     * Licensed to the Apache Software Foundation (ASF) under one   *
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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.impl;
021    
022    import java.util.List;
023    
024    import org.apache.james.jspf.core.DNSRequest;
025    import org.apache.james.jspf.core.exceptions.TimeoutException;
026    import org.apache.james.jspf.executor.DNSAsynchLookupService;
027    import org.apache.james.jspf.executor.IResponse;
028    import org.apache.james.jspf.executor.IResponseQueue;
029    import org.xbill.DNS.DClass;
030    import org.xbill.DNS.Message;
031    import org.xbill.DNS.Name;
032    import org.xbill.DNS.Record;
033    import org.xbill.DNS.Resolver;
034    import org.xbill.DNS.TextParseException;
035    import org.xbill.DNS.Type;
036    
037    import uk.nominet.dnsjnio.ExtendedNonblockingResolver;
038    import uk.nominet.dnsjnio.LookupAsynch;
039    
040    public class DNSJnioAsynchService implements DNSAsynchLookupService {
041    
042        private ExtendedNonblockingResolver resolver;
043    
044        public DNSJnioAsynchService(ExtendedNonblockingResolver resolver) {
045            this.resolver = resolver;
046            LookupAsynch.setDefaultResolver(resolver);
047        }
048        
049        /**
050         * Set the timeout for the resolvers
051         * @param timeout
052         */
053        public synchronized void setTimeout(int timeout) {
054            Resolver[] res = resolver.getResolvers();
055            for (int i = 0; i < res.length; i++) {
056                res[i].setTimeout(timeout);
057            }
058        }
059        
060        /**
061         * @see org.apache.james.jspf.executor.DNSAsynchLookupService#getRecordsAsynch(org.apache.james.jspf.core.DNSRequest, int, org.apache.james.jspf.executor.IResponseQueue)
062         */
063        public void getRecordsAsynch(DNSRequest request, int id,
064                IResponseQueue responsePool) {
065            
066            Message message;
067            try {
068                message = makeQuery(request, id);
069                LookupAsynch la = new LookupAsynch(message.getQuestion().getName(), message.getQuestion().getType());
070                la.runAsynch(new Runnable() {
071    
072                    private IResponseQueue responsePool;
073                    private Integer id;
074                    private LookupAsynch lookup;
075    
076                    public void run() {
077                        responsePool.insertResponse(new IResponse() {
078    
079                            public Exception getException() {
080                                if (lookup.getResult() == LookupAsynch.TRY_AGAIN) {
081                                    return new TimeoutException(lookup.getErrorString());
082                                } else {
083                                    return null;
084                                }
085                            }
086    
087                            public Object getId() {
088                                return id;
089                            }
090    
091                            public List<String> getValue() {
092                                return (DNSServiceXBillImpl.convertRecordsToList(lookup.getAnswers()));
093                            }
094                            
095                        });
096                    }
097    
098                    public Runnable setResponsePool(LookupAsynch la, IResponseQueue responsePool,
099                            Integer integer) {
100                        this.lookup = la;
101                        this.responsePool = responsePool;
102                        this.id = integer;
103                        return this;
104                    }
105                    
106                }.setResponsePool(la, responsePool, new Integer(id)));
107                // this.resolver.sendAsync(message, new Integer(id), new ResponseQueueAdaptor(responsePool));
108            } catch (TextParseException e) {
109                // TODO Auto-generated catch block
110                e.printStackTrace();
111            }
112        }
113    
114        private Message makeQuery(DNSRequest request, int id) throws TextParseException {
115            Name name = Name.fromString(request.getHostname(), Name.root);
116            
117            int type;
118            switch (request.getRecordType()) {
119                case DNSRequest.A: type = Type.A; break;
120                case DNSRequest.AAAA: type = Type.AAAA; break;
121                case DNSRequest.MX: type = Type.MX; break;
122                case DNSRequest.PTR: type = Type.PTR; break;
123                case DNSRequest.SPF: type = Type.SPF; break;
124                case DNSRequest.TXT: type = Type.TXT; break;
125                default: 
126                    throw new UnsupportedOperationException("Unknown query type: "+request.getRecordType());
127            }
128            
129            Record question = Record.newRecord(name, type, DClass.ANY);
130            Message query = Message.newQuery(question);
131            query.getHeader().setID(id);
132            return query;
133        }
134    }