Save This Page
1 /*
2 * JBoss, Home of Professional Open Source
3 * Copyright 2005, JBoss Inc., and individual contributors as indicated
4 * by the @authors tag. See the copyright.txt in the distribution for a
5 * full listing of individual contributors.
6 *
7 * This is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU Lesser General Public License as
9 * published by the Free Software Foundation; either version 2.1 of
10 * the License, or (at your option) any later version.
11 *
12 * This software is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this software; if not, write to the Free
19 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
21 */
22 package org.jboss.ejb.plugins.cmp.jdbc;
23
24 import java.sql.Connection;
25 import java.sql.PreparedStatement;
26 import java.util.Map;
27 import java.rmi.RemoteException;
28 import javax.ejb.RemoveException;
29
30 import org.jboss.ejb.EntityEnterpriseContext;
31 import org.jboss.ejb.EntityContainer;
32 import org.jboss.ejb.plugins.cmp.jdbc.bridge.JDBCCMRFieldBridge;
33 import org.jboss.ejb.plugins.cmp.jdbc.bridge.JDBCEntityBridge;
34 import org.jboss.logging.Logger;
35 import org.jboss.metadata.ConfigurationMetaData;
36 import org.jboss.deployment.DeploymentException;
37
38
39 /**
40 * JDBCRemoveEntityCommand executes a DELETE FROM table WHERE command.
41 *
42 * @author <a href="mailto:dain@daingroup.com">Dain Sundstrom</a>
43 * @author <a href="mailto:rickard.oberg@telkel.com">Rickard Oberg</a>
44 * @author <a href="mailto:marc.fleury@telkel.com">Marc Fleury</a>
45 * @author <a href="mailto:shevlandj@kpi.com.au">Joe Shevland</a>
46 * @author <a href="mailto:justin@j-m-f.demon.co.uk">Justin Forder</a>
47 * @author <a href="mailto:alex@jboss.org">Alexey Loubyansky</a>
48 * @version $Revision: 66439 $
49 */
50 public final class JDBCRemoveEntityCommand
51 {
52 private final JDBCStoreManager manager;
53 private final JDBCEntityBridge entity;
54 private final Logger log;
55 private final String removeEntitySQL;
56 private final boolean syncOnCommitOnly;
57 private boolean batchCascadeDelete;
58
59 public JDBCRemoveEntityCommand(JDBCStoreManager manager)
60 throws DeploymentException
61 {
62 this.manager = manager;
63 entity = (JDBCEntityBridge) manager.getEntityBridge();
64
65 // Create the Log
66 log = Logger.getLogger(
67 this.getClass().getName() +
68 "." +
69 manager.getMetaData().getName());
70
71 StringBuffer sql = new StringBuffer();
72 sql.append(SQLUtil.DELETE_FROM)
73 .append(entity.getQualifiedTableName())
74 .append(SQLUtil.WHERE);
75 SQLUtil.getWhereClause(entity.getPrimaryKeyFields(), sql);
76
77 removeEntitySQL = sql.toString();
78 if(log.isDebugEnabled())
79 log.debug("Remove SQL: " + removeEntitySQL);
80
81 ConfigurationMetaData containerConfig = manager.getContainer().
82 getBeanMetaData().getContainerConfiguration();
83 syncOnCommitOnly = containerConfig.getSyncOnCommitOnly();
84
85 JDBCCMRFieldBridge[] cmrFields = (JDBCCMRFieldBridge[]) entity.getCMRFields();
86 for(int i = 0; i < cmrFields.length; ++i)
87 {
88 if(cmrFields[i].isBatchCascadeDelete())
89 {
90 batchCascadeDelete = true;
91 break;
92 }
93 }
94 }
95
96 public void execute(EntityEnterpriseContext ctx)
97 throws RemoveException, RemoteException
98 {
99 if(entity.isRemoved(ctx))
100 {
101 throw new IllegalStateException("Instance was already removed: id=" + ctx.getId());
102 }
103
104 entity.setIsBeingRemoved(ctx);
105
106 // remove entity from all relations
107 Object[] oldRelationsRef = new Object[1];
108 boolean needsSync = entity.removeFromRelations(ctx, oldRelationsRef);
109
110 // update the related entities (stores the removal from relationships)
111 // if one of the store fails an EJBException will be thrown
112 if(!syncOnCommitOnly && needsSync)
113 {
114 EntityContainer.synchronizeEntitiesWithinTransaction(ctx.getTransaction());
115 }
116
117 if(!batchCascadeDelete)
118 {
119 if(!entity.isScheduledForBatchCascadeDelete(ctx))
120 {
121 executeDeleteSQL(ctx);
122 }
123 else
124 {
125 if(log.isTraceEnabled())
126 log.trace("Instance is scheduled for cascade delete. id=" + ctx.getId());
127 }
128 }
129
130 // cascate-delete to old relations, if relation uses cascade.
131 if(oldRelationsRef[0] != null)
132 {
133 Map oldRelations = (Map)oldRelationsRef[0];
134 entity.cascadeDelete(ctx, oldRelations);
135 }
136
137 if(batchCascadeDelete)
138 {
139 if(!entity.isScheduledForBatchCascadeDelete(ctx))
140 {
141 executeDeleteSQL(ctx);
142 }
143 else
144 {
145 if(log.isTraceEnabled())
146 log.debug("Instance is scheduled for cascade delete. id=" + ctx.getId());
147 }
148 }
149
150 entity.setRemoved(ctx);
151 manager.getReadAheadCache().removeCachedData(ctx.getId());
152 }
153
154 private void executeDeleteSQL(EntityEnterpriseContext ctx) throws RemoveException
155 {
156 Object key = ctx.getId();
157 Connection con = null;
158 PreparedStatement ps = null;
159 int rowsAffected = 0;
160 try
161 {
162 if(log.isDebugEnabled())
163 log.debug("Executing SQL: " + removeEntitySQL);
164
165 // get the connection
166 con = entity.getDataSource().getConnection();
167 ps = con.prepareStatement(removeEntitySQL);
168
169 // set the parameters
170 entity.setPrimaryKeyParameters(ps, 1, key);
171
172 // execute statement
173 rowsAffected = ps.executeUpdate();
174 }
175 catch(Exception e)
176 {
177 log.error("Could not remove " + key, e);
178 throw new RemoveException("Could not remove " + key + ": " + e.getMessage());
179 }
180 finally
181 {
182 JDBCUtil.safeClose(ps);
183 JDBCUtil.safeClose(con);
184 }
185
186 // check results
187 if(rowsAffected == 0)
188 {
189 log.error("Could not remove entity " + key);
190 throw new RemoveException("Could not remove entity");
191 }
192
193 if(log.isTraceEnabled())
194 log.trace("Remove: Rows affected = " + rowsAffected);
195 }
196 }