Source Code Cross Referenced for TxHelperEJB.java in  » Workflow-Engines » obe-1.0 » org » obe » server » j2ee » ejb » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Workflow Engines » obe 1.0 » org.obe.server.j2ee.ejb 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*--
002:
003:         Copyright (C) 2002-2005 Adrian Price.
004:         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 disclaimer that follows
015:            these conditions in the documentation and/or other materials
016:            provided with the distribution.
017:
018:         3. The names "OBE" and "Open Business Engine" must not be used to
019:         	endorse or promote products derived from this software without prior
020:         	written permission.  For written permission, please contact
021:         	adrianprice@sourceforge.net.
022:
023:         4. Products derived from this software may not be called "OBE" or
024:         	"Open Business Engine", nor may "OBE" or "Open Business Engine"
025:         	appear in their name, without prior written permission from
026:         	Adrian Price (adrianprice@users.sourceforge.net).
027:
028:         THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
029:         WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
030:         OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
031:         DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT,
032:         INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
033:         (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
034:         SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
035:         HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
036:         STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
037:         IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
038:         POSSIBILITY OF SUCH DAMAGE.
039:
040:         For more information on OBE, please see
041:         <http://obe.sourceforge.net/>.
042:
043:         */
044:
045:        package org.obe.server.j2ee.ejb;
046:
047:        import org.apache.commons.logging.Log;
048:        import org.apache.commons.logging.LogFactory;
049:        import org.obe.server.j2ee.repository.TransactionUtil;
050:
051:        import javax.ejb.CreateException;
052:        import javax.ejb.SessionSynchronization;
053:        import java.util.HashMap;
054:        import java.util.Map;
055:
056:        /**
057:         * Tracks the transaction lifecycle.  Enables OBE to know when to use read-write
058:         * entity beans instead of read-only beans (if the read-write version for a
059:         * particular entity class has already been used within the current
060:         * transaction).
061:         *
062:         * @author Adrian Price.
063:         * @ejb:bean type="Stateful"
064:         * name="TxHelper"
065:         * display-name="OBE Transaction Helper"
066:         * local-jndi-name="org/obe/ejb/TxHelperLocal"
067:         * transaction-type="Container"
068:         * view-type="local"
069:         * @ejb:home extends="javax.ejb.EJBHome"
070:         * local-extends="javax.ejb.EJBLocalHome"
071:         * local-package="org.obe.server.j2ee"
072:         * @ejb:interface local-extends="javax.ejb.EJBLocalObject"
073:         * local-package="org.obe.server.j2ee"
074:         * @ejb:permission unchecked="true"
075:         * @ejb:transaction type="Supports"
076:         * @weblogic:transaction-isolation ${transaction.isolation}
077:         * @ejb:resource-ref res-name="jdbc/TxDataSource"
078:         * res-type="javax.sql.DataSource"
079:         * res-auth="Container"
080:         * @jboss:resource-manager res-man-class="javax.sql.DataSource"
081:         * res-man-name="jdbc/TxDataSource"
082:         * res-man-jndi-name="java:/${xdoclet.DataSource}"
083:         * @weblogic:resource-description res-ref-name="jdbc/TxDataSource"
084:         * jndi-name="${xdoclet.DataSource}"
085:         * @weblogic:pool max-beans-in-free-pool="50"
086:         * initial-beans-in-free-pool="0"
087:         * @weblogic:cache idle-timeout-seconds="0"
088:         */
089:        public class TxHelperEJB extends AbstractSessionEJB implements 
090:                SessionSynchronization {
091:
092:            private static final long serialVersionUID = 1284341740343653371L;
093:            private static final Log _logger = LogFactory
094:                    .getLog(TxHelperEJB.class);
095:            private String _threadId;
096:            private transient Map _modifiedEntities;
097:
098:            protected Log getLogger() {
099:                return _logger;
100:            }
101:
102:            public void afterBegin() {
103:                if (_logger.isDebugEnabled())
104:                    _logger.debug("afterBegin()");
105:            }
106:
107:            public void afterCompletion(boolean committed) {
108:                if (_logger.isDebugEnabled())
109:                    _logger.debug("afterCompletion(" + committed + ')');
110:            }
111:
112:            public void beforeCompletion() {
113:                if (_logger.isDebugEnabled())
114:                    _logger.debug("beforeCompletion()");
115:
116:                _modifiedEntities.clear();
117:            }
118:
119:            public void ejbActivate() {
120:                if (getLogger().isDebugEnabled())
121:                    getLogger().debug("ejbActivate(), threadId=" + _threadId);
122:                _modifiedEntities = new HashMap();
123:            }
124:
125:            /**
126:             * Creates a new TxHelper bean.
127:             *
128:             * @param threadId The ID of the thread from which the bean is being created.
129:             * @throws CreateException
130:             * @ejb:create-method
131:             */
132:            public void ejbCreate(String threadId) throws CreateException {
133:                if (_logger.isDebugEnabled())
134:                    _logger.debug("ejbCreate(" + threadId + ')');
135:                _threadId = threadId;
136:                _modifiedEntities = new HashMap();
137:            }
138:
139:            public void ejbPassivate() {
140:                if (getLogger().isDebugEnabled())
141:                    getLogger().debug("ejbPassivate(), threadId=" + _threadId);
142:
143:                // The EJB spec. states that when a container removes a SFSB if the bean
144:                // times out after passivation, it is not required to call ejbRemove().
145:                // We can't call our own remove() during passivation, so instead we
146:                // inform TransactionUtil of our passivation so that it can clean up.
147:                TransactionUtil.cleanup(_threadId);
148:                _modifiedEntities = null;
149:            }
150:
151:            public void ejbRemove() {
152:                if (getLogger().isDebugEnabled())
153:                    getLogger().debug("ejbRemove(), threadId=" + _threadId);
154:
155:                // Inform TransactionUtil of our demise so that it can clean up.
156:                TransactionUtil.cleanup(_threadId);
157:                _modifiedEntities = null;
158:            }
159:
160:            /**
161:             * Checks whether the bean is still alive. (Stateful session beans can time
162:             * out or be removed by a runtime exception).
163:             *
164:             * @ejb:interface-method
165:             */
166:            public void ping() {
167:            }
168:
169:            /**
170:             * Marks the specified entity class as having been accessed in read-write
171:             * mode.
172:             *
173:             * @param entityTag A unique tag representing the entity class.
174:             * @ejb:interface-method
175:             */
176:            public void markReadWrite(String entityTag) {
177:                if (_logger.isDebugEnabled()) {
178:                    _logger.debug("Marking txn entity tag '" + entityTag
179:                            + "' read/write");
180:                }
181:                _modifiedEntities.put(entityTag, entityTag);
182:            }
183:
184:            /**
185:             * Checks whether the specified entity class has been accessed in read-write
186:             * mode in the current transaction.
187:             *
188:             * @param entityTag A unique tag representing the entity class.
189:             * @return <code>true</code> if the entity class has been accessed in
190:             *         read-write mode, otherwise <code>false</code>.
191:             * @ejb:interface-method
192:             */
193:            public boolean isReadWrite(String entityTag) {
194:                boolean isReadWrite = _modifiedEntities.containsKey(entityTag);
195:                if (_logger.isDebugEnabled()) {
196:                    _logger.debug("Checking txn entity tag '" + entityTag
197:                            + "' for read/write access. Returning: "
198:                            + isReadWrite);
199:                }
200:                return isReadWrite;
201:            }
202:        }
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