Source Code Cross Referenced for AvalonSpoolRepository.java in  » Web-Mail » james-2.3.1 » org » apache » james » mailrepository » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Web Mail » james 2.3.1 » org.apache.james.mailrepository 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


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:         ****************************************************************/package org.apache.james.mailrepository;
019:
020:        import org.apache.james.services.SpoolRepository;
021:        import org.apache.mailet.Mail;
022:
023:        import java.util.ConcurrentModificationException;
024:        import java.util.Iterator;
025:
026:        /**
027:         * Implementation of a MailRepository on a FileSystem.
028:         *
029:         * Requires a configuration element in the .conf.xml file of the form:
030:         *  <repository destinationURL="file://path-to-root-dir-for-repository"
031:         *              type="MAIL"
032:         *              model="SYNCHRONOUS"/>
033:         * Requires a logger called MailRepository.
034:         *
035:         * @version 1.0.0, 24/04/1999
036:         */
037:        public class AvalonSpoolRepository extends AvalonMailRepository
038:                implements  SpoolRepository {
039:
040:            /**
041:             * <p>Returns an arbitrarily selected mail deposited in this Repository.
042:             * Usage: SpoolManager calls accept() to see if there are any unprocessed 
043:             * mails in the spool repository.</p>
044:             *
045:             * <p>Synchronized to ensure thread safe access to the underlying spool.</p>
046:             *
047:             * @return the mail
048:             */
049:            public synchronized Mail accept() throws InterruptedException {
050:                if ((DEEP_DEBUG) && (getLogger().isDebugEnabled())) {
051:                    getLogger().debug("Method accept() called");
052:                }
053:                return accept(new SpoolRepository.AcceptFilter() {
054:                    public boolean accept(String _, String __, long ___,
055:                            String ____) {
056:                        return true;
057:                    }
058:
059:                    public long getWaitTime() {
060:                        return 0;
061:                    }
062:                });
063:            }
064:
065:            /**
066:             * <p>Returns an arbitrarily selected mail deposited in this Repository that
067:             * is either ready immediately for delivery, or is younger than it's last_updated plus
068:             * the number of failed attempts times the delay time.
069:             * Usage: RemoteDeliverySpool calls accept() with some delay and should block until an
070:             * unprocessed mail is available.</p>
071:             *
072:             * <p>Synchronized to ensure thread safe access to the underlying spool.</p>
073:             *
074:             * @return the mail
075:             */
076:            public synchronized Mail accept(final long delay)
077:                    throws InterruptedException {
078:                if ((DEEP_DEBUG) && (getLogger().isDebugEnabled())) {
079:                    getLogger().debug("Method accept(delay) called");
080:                }
081:                return accept(new SpoolRepository.AcceptFilter() {
082:                    long youngest = 0;
083:
084:                    public boolean accept(String key, String state,
085:                            long lastUpdated, String errorMessage) {
086:                        if (state.equals(Mail.ERROR)) {
087:                            //Test the time...
088:                            long timeToProcess = delay + lastUpdated;
089:
090:                            if (System.currentTimeMillis() > timeToProcess) {
091:                                //We're ready to process this again
092:                                return true;
093:                            } else {
094:                                //We're not ready to process this.
095:                                if (youngest == 0 || youngest > timeToProcess) {
096:                                    //Mark this as the next most likely possible mail to process
097:                                    youngest = timeToProcess;
098:                                }
099:                                return false;
100:                            }
101:                        } else {
102:                            //This mail is good to go... return the key
103:                            return true;
104:                        }
105:                    }
106:
107:                    public long getWaitTime() {
108:                        if (youngest == 0) {
109:                            return 0;
110:                        } else {
111:                            long duration = youngest
112:                                    - System.currentTimeMillis();
113:                            youngest = 0; //get ready for next round
114:                            return duration <= 0 ? 1 : duration;
115:                        }
116:                    }
117:                });
118:            }
119:
120:            /**
121:             * Returns an arbitrarily select mail deposited in this Repository for
122:             * which the supplied filter's accept method returns true.
123:             * Usage: RemoteDeliverySpool calls accept(filter) with some a filter which determines
124:             * based on number of retries if the mail is ready for processing.
125:             * If no message is ready the method will block until one is, the amount of time to block is
126:             * determined by calling the filters getWaitTime method.
127:             *
128:             * <p>Synchronized to ensure thread safe access to the underlying spool.</p>
129:             *
130:             * @return  the mail
131:             */
132:            public synchronized Mail accept(SpoolRepository.AcceptFilter filter)
133:                    throws InterruptedException {
134:                if ((DEEP_DEBUG) && (getLogger().isDebugEnabled())) {
135:                    getLogger().debug("Method accept(Filter) called");
136:                }
137:                while (!Thread.currentThread().isInterrupted())
138:                    try {
139:                        for (Iterator it = list(); it.hasNext();) {
140:                            String s = it.next().toString();
141:                            if ((DEEP_DEBUG) && (getLogger().isDebugEnabled())) {
142:                                StringBuffer logBuffer = new StringBuffer(64)
143:                                        .append("Found item ").append(s)
144:                                        .append(" in spool.");
145:                                getLogger().debug(logBuffer.toString());
146:                            }
147:                            if (lock(s)) {
148:                                if ((DEEP_DEBUG)
149:                                        && (getLogger().isDebugEnabled())) {
150:                                    getLogger().debug(
151:                                            "accept(Filter) has locked: " + s);
152:                                }
153:                                try {
154:                                    Mail mail = retrieve(s);
155:                                    // Retrieve can return null if the mail is no longer on the spool
156:                                    // (i.e. another thread has gotten to it first).
157:                                    // In this case we simply continue to the next key
158:                                    if (mail == null
159:                                            || !filter.accept(mail.getName(),
160:                                                    mail.getState(), mail
161:                                                            .getLastUpdated()
162:                                                            .getTime(), mail
163:                                                            .getErrorMessage())) {
164:                                        unlock(s);
165:                                        continue;
166:                                    }
167:                                    return mail;
168:                                } catch (javax.mail.MessagingException e) {
169:                                    unlock(s);
170:                                    getLogger().error(
171:                                            "Exception during retrieve -- skipping item "
172:                                                    + s, e);
173:                                }
174:                            }
175:                        }
176:
177:                        //We did not find any... let's wait for a certain amount of time
178:                        wait(filter.getWaitTime());
179:                    } catch (InterruptedException ex) {
180:                        throw ex;
181:                    } catch (ConcurrentModificationException cme) {
182:                        // Should never get here now that list methods clones keyset for iterator
183:                        getLogger()
184:                                .error(
185:                                        "CME in spooler - please report to http://james.apache.org",
186:                                        cme);
187:                    }
188:                throw new InterruptedException();
189:            }
190:
191:        }
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