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| 1 | /* | ||
| 2 | * Copyright (c) 2003, 2010, Oracle and/or its affiliates. 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. Oracle designates this | ||
| 8 | * particular file as subject to the "Classpath" exception as provided | ||
| 9 | * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| 22 | * or visit www.oracle.com if you need additional information or have any | ||
| 23 | * questions. | ||
| 24 | */ | ||
| 25 | |||
| 26 | package javax.sql.rowset.spi; | ||
| 27 | |||
| 28 | import javax.sql.*; | ||
| 29 | |||
| 30 | /** | ||
| 31 | * The synchronization mechanism that provides reader/writer capabilities for | ||
| 32 | * disconnected <code>RowSet</code> objects. | ||
| 33 | * A <code>SyncProvider</code> implementation is a class that extends the | ||
| 34 | * <code>SyncProvider</code> abstract class. | ||
| 35 | * <P> | ||
| 36 | * A <code>SyncProvider</code> implementation is | ||
| 37 | * identified by a unique ID, which is its fully qualified class name. | ||
| 38 | * This name must be registered with the | ||
| 39 | * <code>SyncFactory</code> SPI, thus making the implementation available to | ||
| 40 | * all <code>RowSet</code> implementations. | ||
| 41 | * The factory mechanism in the reference implementation uses this name to instantiate | ||
| 42 | * the implementation, which can then provide a <code>RowSet</code> object with its | ||
| 43 | * reader (a <code>javax.sql.RowSetReader</code> object) and its writer (a | ||
| 44 | * <code>javax.sql.RowSetWriter</code> object). | ||
| 45 | * <P> | ||
| 46 | * The Jdbc <code>RowSet</code> Implementations specification provides two | ||
| 47 | * reference implementations of the <code>SyncProvider</code> abstract class: | ||
| 48 | * <code>RIOptimisticProvider</code> and <code>RIXMLProvider</code>. | ||
| 49 | * The <code>RIOptimisticProvider</code> can set any <code>RowSet</code> | ||
| 50 | * implementation with a <code>RowSetReader</code> object and a | ||
| 51 | * <code>RowSetWriter</code> object. However, only the <code>RIXMLProvider</code> | ||
| 52 | * implementation can set an <code>XmlReader</code> object and an | ||
| 53 | * <code>XmlWriter</code> object. A <code>WebRowSet</code> object uses the | ||
| 54 | * <code>XmlReader</code> object to read data in XML format to populate itself with that | ||
| 55 | * data. It uses the <code>XmlWriter</code> object to write itself to a stream or | ||
| 56 | * <code>java.io.Writer</code> object in XML format. | ||
| 57 | * <P> | ||
| 58 | * <h3>1.0 Naming Convention for Implementations</h3> | ||
| 59 | * As a guide to naming <code>SyncProvider</code> | ||
| 60 | * implementations, the following should be noted: | ||
| 61 | * <UL> | ||
| 62 | * <li>The name for a <code>SyncProvider</code> implementation | ||
| 63 | * is its fully qualified class name. | ||
| 64 | * <li>It is recommended that vendors supply a | ||
| 65 | * <code>SyncProvider</code> implementation in a package named <code>providers</code>. | ||
| 66 | * </UL> | ||
| 67 | * <p> | ||
| 68 | * For instance, if a vendor named Fred, Inc. offered a | ||
| 69 | * <code>SyncProvider</code> implementation, you could have the following: | ||
| 70 | * <PRE> | ||
| 71 | * Vendor name: Fred, Inc. | ||
| 72 | * Domain name of vendor: com.fred | ||
| 73 | * Package name: com.fred.providers | ||
| 74 | * SyncProvider implementation class name: HighAvailabilityProvider | ||
| 75 | * | ||
| 76 | * Fully qualified class name of SyncProvider implementation: | ||
| 77 | * com.fred.providers.HighAvailabilityProvider | ||
| 78 | * </PRE> | ||
| 79 | * <P> | ||
| 80 | * The following line of code uses the fully qualified name to register | ||
| 81 | * this implementation with the <code>SyncFactory</code> static instance. | ||
| 82 | * <PRE> | ||
| 83 | * SyncFactory.registerProvider( | ||
| 84 | * "com.fred.providers.HighAvailabilityProvider"); | ||
| 85 | * </PRE> | ||
| 86 | * <P> | ||
| 87 | * The default <code>SyncProvider</code> object provided with the reference | ||
| 88 | * implementation uses the following name: | ||
| 89 | * <pre> | ||
| 90 | * com.sun.rowset.providers.RIOptimisticProvider | ||
| 91 | * </pre> | ||
| 92 | * <p> | ||
| 93 | * A vendor can register a <code>SyncProvider</code> implementation class name | ||
| 94 | * with Oracle Corporation by sending email to jdbc@sun.com. | ||
| 95 | * Oracle will maintain a database listing the | ||
| 96 | * available <code>SyncProvider</code> implementations for use with compliant | ||
| 97 | * <code>RowSet</code> implementations. This database will be similar to the | ||
| 98 | * one already maintained to list available JDBC drivers. | ||
| 99 | * <P> | ||
| 100 | * Vendors should refer to the reference implementation synchronization | ||
| 101 | * providers for additional guidance on how to implement a new | ||
| 102 | * <code>SyncProvider</code> implementation. | ||
| 103 | * | ||
| 104 | * <h3>2.0 How a <code>RowSet</code> Object Gets Its Provider</h3> | ||
| 105 | * | ||
| 106 | * A disconnected <code>Rowset</code> object may get access to a | ||
| 107 | * <code>SyncProvider</code> object in one of the following two ways: | ||
| 108 | * <UL> | ||
| 109 | * <LI>Using a constructor<BR> | ||
| 110 | * <PRE> | ||
| 111 | * CachedRowSet crs = new CachedRowSet( | ||
| 112 | * "com.fred.providers.HighAvailabilitySyncProvider"); | ||
| 113 | * </PRE> | ||
| 114 | * <LI>Using the <code>setSyncProvider</code> method | ||
| 115 | * <PRE> | ||
| 116 | * CachedRowSet crs = new CachedRowSet(); | ||
| 117 | * crs.setSyncProvider("com.fred.providers.HighAvailabilitySyncProvider"); | ||
| 118 | * </PRE> | ||
| 119 | |||
| 120 | * </UL> | ||
| 121 | * <p> | ||
| 122 | * By default, the reference implementations of the <code>RowSet</code> synchronization | ||
| 123 | * providers are always available to the Java platform. | ||
| 124 | * If no other pluggable synchronization providers have been correctly | ||
| 125 | * registered, the <code>SyncFactory</code> will automatically generate | ||
| 126 | * an instance of the default <code>SyncProvider</code> reference implementation. | ||
| 127 | * Thus, in the preceding code fragment, if no implementation named | ||
| 128 | * <code>com.fred.providers.HighAvailabilitySyncProvider</code> has been | ||
| 129 | * registered with the <code>SyncFactory</code> instance, <i>crs</i> will be | ||
| 130 | * assigned the default provider in the reference implementation, which is | ||
| 131 | * <code>com.sun.rowset.providers.RIOptimisticProvider</code>. | ||
| 132 | * <p> | ||
| 133 | * <h3>3.0 Violations and Synchronization Issues</h3> | ||
| 134 | * If an update between a disconnected <code>RowSet</code> object | ||
| 135 | * and a data source violates | ||
| 136 | * the original query or the underlying data source constraints, this will | ||
| 137 | * result in undefined behavior for all disconnected <code>RowSet</code> implementations | ||
| 138 | * and their designated <code>SyncProvider</code> implementations. | ||
| 139 | * Not defining the behavior when such violations occur offers greater flexibility | ||
| 140 | * for a <code>SyncProvider</code> | ||
| 141 | * implementation to determine its own best course of action. | ||
| 142 | * <p> | ||
| 143 | * A <code>SyncProvider</code> implementation | ||
| 144 | * may choose to implement a specific handler to | ||
| 145 | * handle a subset of query violations. | ||
| 146 | * However if an original query violation or a more general data source constraint | ||
| 147 | * violation is not handled by the <code>SyncProvider</code> implementation, | ||
| 148 | * all <code>SyncProvider</code> | ||
| 149 | * objects must throw a <code>SyncProviderException</code>. | ||
| 150 | * <p> | ||
| 151 | * <h3>4.0 Updatable SQL VIEWs</h3> | ||
| 152 | * It is possible for any disconnected or connected <code>RowSet</code> object to be populated | ||
| 153 | * from an SQL query that is formulated originally from an SQL <code>VIEW</code>. | ||
| 154 | * While in many cases it is possible for an update to be performed to an | ||
| 155 | * underlying view, such an update requires additional metadata, which may vary. | ||
| 156 | * The <code>SyncProvider</code> class provides two constants to indicate whether | ||
| 157 | * an implementation supports updating an SQL <code>VIEW</code>. | ||
| 158 | * <ul> | ||
| 159 | * <li><code><b>NONUPDATABLE_VIEW_SYNC</b></code> - Indicates that a <code>SyncProvider</code> | ||
| 160 | * implementation does not support synchronization with an SQL <code>VIEW</code> as the | ||
| 161 | * underlying source of data for the <code>RowSet</code> object. | ||
| 162 | * <li><code><b>UPDATABLE_VIEW_SYNC</b></code> - Indicates that a | ||
| 163 | * <code>SyncProvider</code> implementation | ||
| 164 | * supports synchronization with an SQL <code>VIEW</code> as the underlying source | ||
| 165 | * of data. | ||
| 166 | * </ul> | ||
| 167 | * <P> | ||
| 168 | * The default is for a <code>RowSet</code> object not to be updatable if it was | ||
| 169 | * populated with data from an SQL <code>VIEW</code>. | ||
| 170 | * <P> | ||
| 171 | * <h3>5.0 <code>SyncProvider</code> Constants</h3> | ||
| 172 | * The <code>SyncProvider</code> class provides three sets of constants that | ||
| 173 | * are used as return values or parameters for <code>SyncProvider</code> methods. | ||
| 174 | * <code>SyncProvider</code> objects may be implemented to perform synchronization | ||
| 175 | * between a <code>RowSet</code> object and its underlying data source with varying | ||
| 176 | * degrees of of care. The first group of constants indicate how synchronization | ||
| 177 | * is handled. For example, <code>GRADE_NONE</code> indicates that a | ||
| 178 | * <code>SyncProvider</code> object will not take any care to see what data is | ||
| 179 | * valid and will simply write the <code>RowSet</code> data to the data source. | ||
| 180 | * <code>GRADE_MODIFIED_AT_COMMIT</code> indicates that the provider will check | ||
| 181 | * only modified data for validity. Other grades check all data for validity | ||
| 182 | * or set locks when data is modified or loaded. | ||
| 183 | * <OL> | ||
| 184 | * <LI>Constants to indicate the synchronization grade of a | ||
| 185 | * <code>SyncProvider</code> object | ||
| 186 | * <UL> | ||
| 187 | * <LI>SyncProvider.GRADE_NONE | ||
| 188 | * <LI>SyncProvider.GRADE_MODIFIED_AT_COMMIT | ||
| 189 | * <LI>SyncProvider.GRADE_CHECK_ALL_AT_COMMIT | ||
| 190 | * <LI>SyncProvider.GRADE_LOCK_WHEN_MODIFIED | ||
| 191 | * <LI>SyncProvider.GRADE_LOCK_WHEN_LOADED | ||
| 192 | * </UL> | ||
| 193 | * <LI>Constants to indicate what locks are set on the data source | ||
| 194 | * <UL> | ||
| 195 | * <LI>SyncProvider.DATASOURCE_NO_LOCK | ||
| 196 | * <LI>SyncProvider.DATASOURCE_ROW_LOCK | ||
| 197 | * <LI>SyncProvider.DATASOURCE_TABLE_LOCK | ||
| 198 | * <LI>SyncProvider.DATASOURCE_DB_LOCK | ||
| 199 | * </UL> | ||
| 200 | * <LI>Constants to indicate whether a <code>SyncProvider</code> object can | ||
| 201 | * perform updates to an SQL <code>VIEW</code> <BR> | ||
| 202 | * These constants are explained in the preceding section (4.0). | ||
| 203 | * <UL> | ||
| 204 | * <LI>SyncProvider.UPDATABLE_VIEW_SYNC | ||
| 205 | * <LI>SyncProvider.NONUPDATABLE_VIEW_SYNC | ||
| 206 | * </UL> | ||
| 207 | * </OL> | ||
| 208 | * | ||
| 209 | * @author Jonathan Bruce | ||
| 210 | * @see javax.sql.rowset.spi.SyncFactory | ||
| 211 | * @see javax.sql.rowset.spi.SyncFactoryException | ||
| 212 | */ | ||
| 213 | public abstract class SyncProvider { | ||
| 214 | |||
| 215 | /** | ||
| 216 | * Creates a default <code>SyncProvider</code> object. | ||
| 217 | */ | ||
| 218 | public SyncProvider() { | ||
| 219 | } | ||
| 220 | |||
| 221 | /** | ||
| 222 | * Returns the unique identifier for this <code>SyncProvider</code> object. | ||
| 223 | * | ||
| 224 | * @return a <code>String</code> object with the fully qualified class name of | ||
| 225 | * this <code>SyncProvider</code> object | ||
| 226 | */ | ||
| 227 | public abstract String getProviderID(); | ||
| 228 | |||
| 229 | /** | ||
| 230 | * Returns a <code>javax.sql.RowSetReader</code> object, which can be used to | ||
| 231 | * populate a <code>RowSet</code> object with data. | ||
| 232 | * | ||
| 233 | * @return a <code>javax.sql.RowSetReader</code> object | ||
| 234 | */ | ||
| 235 | public abstract RowSetReader getRowSetReader(); | ||
| 236 | |||
| 237 | /** | ||
| 238 | * Returns a <code>javax.sql.RowSetWriter</code> object, which can be | ||
| 239 | * used to write a <code>RowSet</code> object's data back to the | ||
| 240 | * underlying data source. | ||
| 241 | * | ||
| 242 | * @return a <code>javax.sql.RowSetWriter</code> object | ||
| 243 | */ | ||
| 244 | public abstract RowSetWriter getRowSetWriter(); | ||
| 245 | |||
| 246 | /** | ||
| 247 | * Returns a constant indicating the | ||
| 248 | * grade of synchronization a <code>RowSet</code> object can expect from | ||
| 249 | * this <code>SyncProvider</code> object. | ||
| 250 | * | ||
| 251 | * @return an int that is one of the following constants: | ||
| 252 | * SyncProvider.GRADE_NONE, | ||
| 253 | * SyncProvider.GRADE_CHECK_MODIFIED_AT_COMMIT, | ||
| 254 | * SyncProvider.GRADE_CHECK_ALL_AT_COMMIT, | ||
| 255 | * SyncProvider.GRADE_LOCK_WHEN_MODIFIED, | ||
| 256 | * SyncProvider.GRADE_LOCK_WHEN_LOADED | ||
| 257 | */ | ||
| 258 | public abstract int getProviderGrade(); | ||
| 259 | |||
| 260 | |||
| 261 | /** | ||
| 262 | * Sets a lock on the underlying data source at the level indicated by | ||
| 263 | * <i>datasource_lock</i>. This should cause the | ||
| 264 | * <code>SyncProvider</code> to adjust its behavior by increasing or | ||
| 265 | * decreasing the level of optimism it provides for a successful | ||
| 266 | * synchronization. | ||
| 267 | * | ||
| 268 | * @param datasource_lock one of the following constants indicating the severity | ||
| 269 | * level of data source lock required: | ||
| 270 | * <pre> | ||
| 271 | * SyncProvider.DATASOURCE_NO_LOCK, | ||
| 272 | * SyncProvider.DATASOURCE_ROW_LOCK, | ||
| 273 | * SyncProvider.DATASOURCE_TABLE_LOCK, | ||
| 274 | * SyncProvider.DATASOURCE_DB_LOCK, | ||
| 275 | * </pre> | ||
| 276 | * @throws SyncProviderException if an unsupported data source locking level | ||
| 277 | * is set. | ||
| 278 | * @see #getDataSourceLock | ||
| 279 | */ | ||
| 280 | public abstract void setDataSourceLock(int datasource_lock) | ||
| 281 | throws SyncProviderException; | ||
| 282 | |||
| 283 | /** | ||
| 284 | * Returns the current data source lock severity level active in this | ||
| 285 | * <code>SyncProvider</code> implementation. | ||
| 286 | * | ||
| 287 | * @return a constant indicating the current level of data source lock | ||
| 288 | * active in this <code>SyncProvider</code> object; | ||
| 289 | * one of the following: | ||
| 290 | * <pre> | ||
| 291 | * SyncProvider.DATASOURCE_NO_LOCK, | ||
| 292 | * SyncProvider.DATASOURCE_ROW_LOCK, | ||
| 293 | * SyncProvider.DATASOURCE_TABLE_LOCK, | ||
| 294 | * SyncProvider.DATASOURCE_DB_LOCK | ||
| 295 | * </pre> | ||
| 296 | * @throws SyncProviderExceptiom if an error occurs determining the data | ||
| 297 | * source locking level. | ||
| 298 | * @see #setDataSourceLock | ||
| 299 | |||
| 300 | */ | ||
| 301 | public abstract int getDataSourceLock() | ||
| 302 | throws SyncProviderException; | ||
| 303 | |||
| 304 | /** | ||
| 305 | * Returns whether this <code>SyncProvider</code> implementation | ||
| 306 | * can perform synchronization between a <code>RowSet</code> object | ||
| 307 | * and the SQL <code>VIEW</code> in the data source from which | ||
| 308 | * the <code>RowSet</code> object got its data. | ||
| 309 | * | ||
| 310 | * @return an <code>int</code> saying whether this <code>SyncProvider</code> | ||
| 311 | * object supports updating an SQL <code>VIEW</code>; one of the | ||
| 312 | * following: | ||
| 313 | * SyncProvider.UPDATABLE_VIEW_SYNC, | ||
| 314 | * SyncProvider.NONUPDATABLE_VIEW_SYNC | ||
| 315 | */ | ||
| 316 | public abstract int supportsUpdatableView(); | ||
| 317 | |||
| 318 | /** | ||
| 319 | * Returns the release version of this <code>SyncProvider</code> instance. | ||
| 320 | * | ||
| 321 | * @return a <code>String</code> detailing the release version of the | ||
| 322 | * <code>SyncProvider</code> implementation | ||
| 323 | */ | ||
| 324 | public abstract String getVersion(); | ||
| 325 | |||
| 326 | /** | ||
| 327 | * Returns the vendor name of this <code>SyncProvider</code> instance | ||
| 328 | * | ||
| 329 | * @return a <code>String</code> detailing the vendor name of this | ||
| 330 | * <code>SyncProvider</code> implementation | ||
| 331 | */ | ||
| 332 | public abstract String getVendor(); | ||
| 333 | |||
| 334 | /* | ||
| 335 | * Standard description of synchronization grades that a SyncProvider | ||
| 336 | * could provide. | ||
| 337 | */ | ||
| 338 | |||
| 339 | /** | ||
| 340 | * Indicates that no synchronization with the originating data source is | ||
| 341 | * provided. A <code>SyncProvider</code> | ||
| 342 | * implementation returning this grade will simply attempt to write | ||
| 343 | * updates in the <code>RowSet</code> object to the underlying data | ||
| 344 | * source without checking the validity of any data. | ||
| 345 | * | ||
| 346 | */ | ||
| 347 | public static final int GRADE_NONE = 1; | ||
| 348 | |||
| 349 | /** | ||
| 350 | * Indicates a low level optimistic synchronization grade with | ||
| 351 | * respect to the originating data source. | ||
| 352 | * | ||
| 353 | * A <code>SyncProvider</code> implementation | ||
| 354 | * returning this grade will check only rows that have changed. | ||
| 355 | * | ||
| 356 | */ | ||
| 357 | public static final int GRADE_CHECK_MODIFIED_AT_COMMIT = 2; | ||
| 358 | |||
| 359 | /** | ||
| 360 | * Indicates a high level optimistic synchronization grade with | ||
| 361 | * respect to the originating data source. | ||
| 362 | * | ||
| 363 | * A <code>SyncProvider</code> implementation | ||
| 364 | * returning this grade will check all rows, including rows that have not | ||
| 365 | * changed. | ||
| 366 | */ | ||
| 367 | public static final int GRADE_CHECK_ALL_AT_COMMIT = 3; | ||
| 368 | |||
| 369 | /** | ||
| 370 | * Indicates a pessimistic synchronization grade with | ||
| 371 | * respect to the originating data source. | ||
| 372 | * | ||
| 373 | * A <code>SyncProvider</code> | ||
| 374 | * implementation returning this grade will lock the row in the originating | ||
| 375 | * data source. | ||
| 376 | */ | ||
| 377 | public static final int GRADE_LOCK_WHEN_MODIFIED = 4; | ||
| 378 | |||
| 379 | /** | ||
| 380 | * Indicates the most pessimistic synchronization grade with | ||
| 381 | * respect to the originating | ||
| 382 | * data source. A <code>SyncProvider</code> | ||
| 383 | * implementation returning this grade will lock the entire view and/or | ||
| 384 | * table affected by the original statement used to populate a | ||
| 385 | * <code>RowSet</code> object. | ||
| 386 | */ | ||
| 387 | public static final int GRADE_LOCK_WHEN_LOADED = 5; | ||
| 388 | |||
| 389 | /** | ||
| 390 | * Indicates that no locks remain on the originating data source. This is the default | ||
| 391 | * lock setting for all <code>SyncProvider</code> implementations unless | ||
| 392 | * otherwise directed by a <code>RowSet</code> object. | ||
| 393 | */ | ||
| 394 | public static final int DATASOURCE_NO_LOCK = 1; | ||
| 395 | |||
| 396 | /** | ||
| 397 | * Indicates that a lock is placed on the rows that are touched by the original | ||
| 398 | * SQL statement used to populate the <code>RowSet</code> object | ||
| 399 | * that is using this <code>SyncProvider</code> object. | ||
| 400 | */ | ||
| 401 | public static final int DATASOURCE_ROW_LOCK = 2; | ||
| 402 | |||
| 403 | /** | ||
| 404 | * Indicates that a lock is placed on all tables that are touched by the original | ||
| 405 | * SQL statement used to populate the <code>RowSet</code> object | ||
| 406 | * that is using this <code>SyncProvider</code> object. | ||
| 407 | */ | ||
| 408 | public static final int DATASOURCE_TABLE_LOCK = 3; | ||
| 409 | |||
| 410 | /** | ||
| 411 | * Indicates that a lock is placed on the entire data source that is the source of | ||
| 412 | * data for the <code>RowSet</code> object | ||
| 413 | * that is using this <code>SyncProvider</code> object. | ||
| 414 | */ | ||
| 415 | public static final int DATASOURCE_DB_LOCK = 4; | ||
| 416 | |||
| 417 | /** | ||
| 418 | * Indicates that a <code>SyncProvider</code> implementation | ||
| 419 | * supports synchronization between a <code>RowSet</code> object and | ||
| 420 | * the SQL <code>VIEW</code> used to populate it. | ||
| 421 | */ | ||
| 422 | public static final int UPDATABLE_VIEW_SYNC = 5; | ||
| 423 | |||
| 424 | /** | ||
| 425 | * Indicates that a <code>SyncProvider</code> implementation | ||
| 426 | * does <B>not</B> support synchronization between a <code>RowSet</code> | ||
| 427 | * object and the SQL <code>VIEW</code> used to populate it. | ||
| 428 | */ | ||
| 429 | public static final int NONUPDATABLE_VIEW_SYNC = 6; | ||
| 430 | } | ||