Source Code Cross Referenced for SimpleTransactionManager.java in  » J2EE » panther » org » lateralnz » simpletrans » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » panther » org.lateralnz.simpletrans 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /* ====================================================================
002:         * The LateralNZ Software License, Version 1.0
003:         *
004:         * Copyright (c) 2003 LateralNZ.  All rights reserved.
005:         *
006:         * Redistribution and use in source and binary forms, with or without
007:         * modification, are permitted provided that the following conditions
008:         * are met:
009:         *
010:         * 1. Redistributions of source code must retain the above copyright
011:         *    notice, this list of conditions and the following disclaimer.
012:         *
013:         * 2. Redistributions in binary form must reproduce the above copyright
014:         *    notice, this list of conditions and the following disclaimer in
015:         *    the documentation and/or other materials provided with the
016:         *    distribution.
017:         *
018:         * 3. The end-user documentation included with the redistribution,
019:         *    if any, must include the following acknowledgment:
020:         *       "This product includes software developed by 
021:         *        LateralNZ (http://www.lateralnz.org/) and other third parties."
022:         *    Alternately, this acknowledgment may appear in the software itself,
023:         *    if and wherever such third-party acknowledgments normally appear.
024:         *
025:         * 4. The names "LateralNZ" must not be used to endorse or promote 
026:         *    products derived from this software without prior written 
027:         *    permission. For written permission, please 
028:         *    contact oss@lateralnz.org.
029:         *
030:         * 5. Products derived from this software may not be called "Panther", 
031:         *    or "Lateral" or "LateralNZ", nor may "PANTHER" or "LATERAL" or 
032:         *    "LATERALNZ" appear in their name, without prior written 
033:         *    permission of LateralNZ.
034:         *
035:         * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
036:         * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
037:         * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
038:         * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
039:         * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
040:         * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
041:         * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
042:         * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
043:         * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
044:         * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
045:         * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
046:         * SUCH DAMAGE.
047:         * ====================================================================
048:         *
049:         * This software consists of voluntary contributions made by many
050:         * individuals on behalf of LateralNZ.  For more
051:         * information on Lateral, please see http://www.lateralnz.com/ or
052:         * http://www.lateralnz.org
053:         *
054:         */
055:        package org.lateralnz.simpletrans;
056:
057:        import java.io.Serializable;
058:        import javax.naming.Reference;
059:        import javax.naming.Referenceable;
060:        import javax.transaction.HeuristicMixedException;
061:        import javax.transaction.HeuristicRollbackException;
062:        import javax.transaction.RollbackException;
063:        import javax.transaction.Status;
064:        import javax.transaction.SystemException;
065:        import javax.transaction.Transaction;
066:        import javax.transaction.TransactionManager;
067:        import javax.transaction.UserTransaction;
068:
069:        import org.apache.log4j.Logger;
070:
071:        /**
072:         * a singleton implementation of a transaction manager, using thread-local variables to store
073:         * the current transaction.
074:         *
075:         * @author J R Briggs
076:         */
077:        public class SimpleTransactionManager implements  TransactionManager,
078:                UserTransaction, Serializable, Referenceable {
079:            private static final Logger log = Logger
080:                    .getLogger(SimpleTransactionManager.class.getName());
081:            private static Reference REF = new Reference(
082:                    SimpleTransactionManager.class.getName());
083:            private static final SimpleTransactionManager stm = new SimpleTransactionManager();
084:
085:            private static final Boolean FALSE = new Boolean(false);
086:            private static final Boolean TRUE = new Boolean(true);
087:
088:            private static ThreadLocal IN_TRANS = new ThreadLocal() {
089:                protected Object initialValue() {
090:                    return FALSE;
091:                }
092:            };
093:
094:            private static ThreadLocal TRANS = new ThreadLocal() {
095:                protected Object initialValue() {
096:                    return new SimpleTransaction();
097:                }
098:            };
099:
100:            public static final SimpleTransactionManager getTransactionManager() {
101:                return stm;
102:            }
103:
104:            public Reference getReference() {
105:                return REF;
106:            }
107:
108:            /**
109:             * begin a transaction. This method differs from that specified by the TransactionManager
110:             * interface, in that it doesn't throw an exception if the current thread is already in 
111:             * a transaction -- and it doesn't create a nested transaction.  This basically
112:             * assumes that everything will run in the current transaction.
113:             */
114:            public void begin() {
115:                if (!isInTransaction()) {
116:                    IN_TRANS.set(TRUE);
117:                    Transaction t = new SimpleTransaction();
118:                    TRANS.set(t);
119:                    if (log.isDebugEnabled()) {
120:                        log.debug("started new transaction " + t);
121:                    }
122:                } else if (log.isDebugEnabled()) {
123:                    log.debug("new transaction not started, already in trans");
124:                }
125:            }
126:
127:            /**
128:             * commit the current transaction (note: this doesn't throw an error if the
129:             * current thread is not in a transaction)
130:             */
131:            public void commit() throws RollbackException,
132:                    HeuristicMixedException, HeuristicRollbackException,
133:                    SystemException {
134:                if (isInTransaction()) {
135:                    Transaction trans = (Transaction) TRANS.get();
136:                    trans.commit();
137:                    TRANS.set(null);
138:                    IN_TRANS.set(FALSE);
139:                    if (log.isDebugEnabled()) {
140:                        log.debug("committed transaction " + trans);
141:                    }
142:                } else if (log.isDebugEnabled()) {
143:                    log.debug("not in transaction, no commit");
144:                }
145:            }
146:
147:            /**
148:             * get the status of the current transaction
149:             */
150:            public int getStatus() throws SystemException {
151:                if (isInTransaction()) {
152:                    Transaction trans = (Transaction) TRANS.get();
153:                    return trans.getStatus();
154:                } else {
155:                    return Status.STATUS_NO_TRANSACTION;
156:                }
157:            }
158:
159:            /**
160:             * get the transaction for the current (calling) thread
161:             */
162:            public Transaction getTransaction() {
163:                if (isInTransaction()) {
164:                    return (Transaction) TRANS.get();
165:                } else {
166:                    return null;
167:                }
168:            }
169:
170:            /**
171:             * not supported
172:             */
173:            public void resume(Transaction transaction) {
174:                throw new UnsupportedOperationException();
175:            }
176:
177:            /**
178:             * rollback the current transaction (note: this doesn't throw an error if the
179:             * current thread is not in a transaction)
180:             */
181:            public void rollback() throws SystemException {
182:                if (isInTransaction()) {
183:                    Transaction trans = (Transaction) TRANS.get();
184:                    trans.rollback();
185:                    TRANS.set(null);
186:                    IN_TRANS.set(FALSE);
187:                    if (log.isDebugEnabled()) {
188:                        log.debug("rolled back transaction");
189:                    }
190:                } else if (log.isDebugEnabled()) {
191:                    log.debug("not in transaction, no commit");
192:                }
193:            }
194:
195:            /**
196:             * flag the current transaction  for rollback (note: this doesn't throw an error
197:             * if the current thread is not in a transaction)
198:             */
199:            public void setRollbackOnly() throws SystemException {
200:                if (isInTransaction()) {
201:                    Transaction trans = (Transaction) TRANS.get();
202:                    trans.setRollbackOnly();
203:                }
204:            }
205:
206:            /**
207:             * not supported
208:             */
209:            public void setTransactionTimeout(int param) {
210:                throw new UnsupportedOperationException();
211:            }
212:
213:            /**
214:             * not supported
215:             */
216:            public Transaction suspend() {
217:                throw new UnsupportedOperationException();
218:            }
219:
220:            /**
221:             * a helper function to indicate if the calling thread is in a transaction
222:             */
223:            protected boolean isInTransaction() {
224:                Boolean b = (Boolean) IN_TRANS.get();
225:                if (b.booleanValue()) {
226:                    Transaction trans = (Transaction) TRANS.get();
227:                    try {
228:                        if (trans != null
229:                                && trans.getStatus() != Status.STATUS_NO_TRANSACTION
230:                                && trans.getStatus() != Status.STATUS_UNKNOWN) {
231:                            return true;
232:                        }
233:                    } catch (Exception e) {
234:                        e.printStackTrace();
235:                    }
236:                }
237:                return false;
238:            }
239:
240:        }
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