J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2003-2006 Sun Microsystems, Inc. All Rights Reserved. |
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | * |
| 5 | * This code is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 only, as |
| 7 | * published by the Free Software Foundation. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun in the LICENSE file that accompanied this code. |
| 10 | * |
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 14 | * version 2 for more details (a copy is included in the LICENSE file that |
| 15 | * accompanied this code). |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License version |
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 20 | * |
| 21 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | package com.sun.rowset.providers; |
| 27 | |
| 28 | import com.sun.rowset.JdbcRowSetResourceBundle; |
| 29 | import javax.sql.*; |
| 30 | import java.io.*; |
| 31 | |
| 32 | import javax.sql.rowset.spi.*; |
| 33 | import com.sun.rowset.internal.*; |
| 34 | |
| 35 | /** |
| 36 | * The reference implementation of a JDBC Rowset synchronization provider |
| 37 | * providing optimistic synchronization with a relational datastore |
| 38 | * using any JDBC technology-enabled driver. |
| 39 | * <p> |
| 40 | * <h3>1.0 Backgroud</h3> |
| 41 | * This synchronization provider is registered with the |
| 42 | * <code>SyncFactory</code> by default as the |
| 43 | * <code>com.sun.rowset.providers.RIOptimisticProvider</code>. |
| 44 | * As an extension of the <code>SyncProvider</code> abstract |
| 45 | * class, it provides the reader and writer classes required by disconnected |
| 46 | * rowsets as <code>javax.sql.RowSetReader</code> and <code>javax.sql.RowSetWriter</code> |
| 47 | * interface implementations. As a reference implementation, |
| 48 | * <code>RIOptimisticProvider</code> provides a |
| 49 | * fully functional implementation offering a medium grade classification of |
| 50 | * syncrhonization, namely GRADE_CHECK_MODIFIED_AT_COMMIT. A |
| 51 | * disconnected <code>RowSet</code> implementation using the |
| 52 | * <code>RIOptimisticProvider</code> can expect the writer to |
| 53 | * check only rows that have been modified in the <code>RowSet</code> against |
| 54 | * the values in the data source. If there is a conflict, that is, if a value |
| 55 | * in the data source has been changed by another party, the |
| 56 | * <code>RIOptimisticProvider</code> will not write any of the changes to the data |
| 57 | * source and will throw a <code>SyncProviderException</code> object. |
| 58 | * |
| 59 | * <h3>2.0 Usage</h3> |
| 60 | * Standard disconnected <code>RowSet</code> implementations may opt to use this |
| 61 | * <code>SyncProvider</code> implementation in one of two ways: |
| 62 | * <OL> |
| 63 | * <LI>By specifically calling the <code>setSyncProvider</code> method |
| 64 | defined in the <code>CachedRowSet</code> interface |
| 65 | * <pre> |
| 66 | * CachedRowset crs = new FooCachedRowSetImpl(); |
| 67 | * crs.setSyncProvider("com.sun.rowset.providers.RIOptimisticProvider"); |
| 68 | * </pre> |
| 69 | * <LI>By specifying it in the constructor of the <code>RowSet</code> |
| 70 | * implementation |
| 71 | * <pre> |
| 72 | * CachedRowset crs = new FooCachedRowSetImpl( |
| 73 | * "com.sun.rowset.providers.RIOptimisticProvider"); |
| 74 | * </pre> |
| 75 | * </OL> |
| 76 | * Note that because the <code>RIOptimisticProvider</code> implementation is |
| 77 | * the default provider, it will always be the provider when no provider ID is |
| 78 | * specified to the constructor. |
| 79 | * <P> |
| 80 | * See the standard <code>RowSet</code> reference implementations in the |
| 81 | * <code>com.sun.rowset</code> package for more details. |
| 82 | * |
| 83 | * @author Jonathan Bruce |
| 84 | * @see javax.sql.rowset.spi.SyncProvider |
| 85 | * @see javax.sql.rowset.spi.SyncProviderException |
| 86 | * @see javax.sql.rowset.spi.SyncFactory |
| 87 | * @see javax.sql.rowset.spi.SyncFactoryException |
| 88 | * |
| 89 | */ |
| 90 | public final class RIOptimisticProvider extends SyncProvider implements Serializable { |
| 91 | |
| 92 | private CachedRowSetReader reader; |
| 93 | private CachedRowSetWriter writer; |
| 94 | |
| 95 | /** |
| 96 | * The unique provider indentifier. |
| 97 | */ |
| 98 | private String providerID = "com.sun.rowset.providers.RIOptimisticProvider"; |
| 99 | |
| 100 | /** |
| 101 | * The vendor name of this SyncProvider implementation |
| 102 | */ |
| 103 | private String vendorName = "Sun Microsystems Inc."; |
| 104 | |
| 105 | /** |
| 106 | * The version number of this SyncProvider implementation |
| 107 | */ |
| 108 | private String versionNumber = "1.0"; |
| 109 | |
| 110 | /** |
| 111 | * ResourceBundle |
| 112 | */ |
| 113 | private JdbcRowSetResourceBundle resBundle; |
| 114 | |
| 115 | /** |
| 116 | * Creates an <code>RIOptimisticProvider</code> object initialized with the |
| 117 | * fully qualified class name of this <code>SyncProvider</code> implementation |
| 118 | * and a default reader and writer. |
| 119 | * <P> |
| 120 | * This provider is available to all disconnected <code>RowSet</code> implementations |
| 121 | * as the default persistence provider. |
| 122 | */ |
| 123 | public RIOptimisticProvider() { |
| 124 | providerID = this.getClass().getName(); |
| 125 | reader = new CachedRowSetReader(); |
| 126 | writer = new CachedRowSetWriter(); |
| 127 | try { |
| 128 | resBundle = JdbcRowSetResourceBundle.getJdbcRowSetResourceBundle(); |
| 129 | } catch(IOException ioe) { |
| 130 | throw new RuntimeException(ioe); |
| 131 | } |
| 132 | } |
| 133 | |
| 134 | /** |
| 135 | * Returns the <code>'javax.sql.rowset.providers.RIOptimisticProvider'</code> |
| 136 | * provider identification string. |
| 137 | * |
| 138 | * @return String Provider ID of this persistence provider |
| 139 | */ |
| 140 | public String getProviderID() { |
| 141 | return providerID; |
| 142 | } |
| 143 | |
| 144 | /** |
| 145 | * Returns the <code>javax.sql.RowSetWriter</code> object for this |
| 146 | * <code>RIOptimisticProvider</code> object. This is the writer that will |
| 147 | * write changes made to the <code>Rowset</code> object back to the data source. |
| 148 | * |
| 149 | * @return the <code>javax.sql.RowSetWriter</code> object for this |
| 150 | * <code>RIOptimisticProvider</code> object |
| 151 | */ |
| 152 | public RowSetWriter getRowSetWriter() { |
| 153 | try { |
| 154 | writer.setReader(reader); |
| 155 | } catch (java.sql.SQLException e) {} |
| 156 | return writer; |
| 157 | } |
| 158 | |
| 159 | /** |
| 160 | * Returns the <code>javax.sql.RowSetReader</code> object for this |
| 161 | * <code>RIOptimisticProvider</code> object. This is the reader that will |
| 162 | * populate a <code>RowSet</code> object using this <code>RIOptimisticProvider</code>. |
| 163 | * |
| 164 | * @return the <code>javax.sql.RowSetReader</code> object for this |
| 165 | * <code>RIOptimisticProvider</code> object |
| 166 | */ |
| 167 | public RowSetReader getRowSetReader() { |
| 168 | return reader; |
| 169 | } |
| 170 | |
| 171 | /** |
| 172 | * Returns the <code>SyncProvider</code> grade of synchronization that |
| 173 | * <code>RowSet</code> objects can expect when using this |
| 174 | * implementation. As an optimisic synchonization provider, the writer |
| 175 | * will only check rows that have been modified in the <code>RowSet</code> |
| 176 | * object. |
| 177 | */ |
| 178 | public int getProviderGrade() { |
| 179 | return SyncProvider.GRADE_CHECK_MODIFIED_AT_COMMIT; |
| 180 | } |
| 181 | |
| 182 | /** |
| 183 | * Modifies the data source lock severity according to the standard |
| 184 | * <code>SyncProvider</code> classifications. |
| 185 | * |
| 186 | * @param datasource_lock An <code>int</code> indicating the level of locking to be |
| 187 | * set; must be one of the following constants: |
| 188 | * <PRE> |
| 189 | * SyncProvider.DATASOURCE_NO_LOCK, |
| 190 | * SyncProvider.DATASOURCE_ROW_LOCK, |
| 191 | * SyncProvider.DATASOURCE_TABLE_LOCK, |
| 192 | * SyncProvider.DATASOURCE_DB_LOCk |
| 193 | * </PRE> |
| 194 | * @throws SyncProviderException if the parameter specified is not |
| 195 | * <code>SyncProvider.DATASOURCE_NO_LOCK</code> |
| 196 | */ |
| 197 | public void setDataSourceLock(int datasource_lock) throws SyncProviderException { |
| 198 | if(datasource_lock != SyncProvider.DATASOURCE_NO_LOCK ) { |
| 199 | throw new SyncProviderException(resBundle.handleGetObject("riop.locking").toString()); |
| 200 | } |
| 201 | } |
| 202 | |
| 203 | /** |
| 204 | * Returns the active data source lock severity in this |
| 205 | * reference implementation of the <code>SyncProvider</code> |
| 206 | * abstract class. |
| 207 | * |
| 208 | * @return <code>SyncProvider.DATASOURCE_NO_LOCK</code>. |
| 209 | * The reference implementation does not support data source locks. |
| 210 | */ |
| 211 | public int getDataSourceLock() throws SyncProviderException { |
| 212 | return SyncProvider.DATASOURCE_NO_LOCK; |
| 213 | } |
| 214 | |
| 215 | /** |
| 216 | * Returns the supported updatable view abilities of the |
| 217 | * reference implementation of the <code>SyncProvider</code> |
| 218 | * abstract class. |
| 219 | * |
| 220 | * @return <code>SyncProvider.NONUPDATABLE_VIEW_SYNC</code>. The |
| 221 | * the reference implementation does not support updating tables |
| 222 | * that are the source of a view. |
| 223 | */ |
| 224 | public int supportsUpdatableView() { |
| 225 | return SyncProvider.NONUPDATABLE_VIEW_SYNC; |
| 226 | } |
| 227 | |
| 228 | /** |
| 229 | * Returns the release version ID of the Reference Implementation Optimistic |
| 230 | * Synchronization Provider. |
| 231 | * |
| 232 | * @return the <code>String</code> detailing the version number of this SyncProvider |
| 233 | */ |
| 234 | public String getVersion() { |
| 235 | return this.versionNumber; |
| 236 | } |
| 237 | |
| 238 | /** |
| 239 | * Returns the vendor name of the Reference Implemntation Optimistic |
| 240 | * Syncchronication Provider |
| 241 | * |
| 242 | * @return the <code>String</code> detailing the vendor name of this |
| 243 | * SyncProvider |
| 244 | */ |
| 245 | public String getVendor() { |
| 246 | return this.vendorName; |
| 247 | } |
| 248 | } |