Mercurial > dive4elements > framework
comparison artifact-database/src/main/java/de/intevation/artifactdatabase/Backend.java @ 128:bfa65a812c7a
Made the backend singleton.
artifacts/trunk@1352 c6561f87-3c4e-4783-a992-168aeb5c3f6f
| author | Ingo Weinzierl <ingo.weinzierl@intevation.de> |
|---|---|
| date | Tue, 01 Mar 2011 18:52:48 +0000 |
| parents | 933bbc9fc11f |
| children | 2950c6011afa |
comparison
equal
deleted
inserted
replaced
| 127:0245a87df368 | 128:bfa65a812c7a |
|---|---|
| 77 * The SQL statement to replace the content of an | 77 * The SQL statement to replace the content of an |
| 78 * existing artifact inside the database. | 78 * existing artifact inside the database. |
| 79 */ | 79 */ |
| 80 public static final String SQL_REPLACE = | 80 public static final String SQL_REPLACE = |
| 81 SQL.get("artifacts.replace"); | 81 SQL.get("artifacts.replace"); |
| 82 | |
| 83 /** The singleton.*/ | |
| 84 protected static Backend instance; | |
| 82 | 85 |
| 83 /** | 86 /** |
| 84 * The database cleaner. Reference is stored here because | 87 * The database cleaner. Reference is stored here because |
| 85 * the cleaner is woken up if the backend finds an outdated | 88 * the cleaner is woken up if the backend finds an outdated |
| 86 * artifact. This artifact should be removed as soon as | 89 * artifact. This artifact should be removed as soon as |
| 205 */ | 208 */ |
| 206 public Backend(DatabaseCleaner cleaner) { | 209 public Backend(DatabaseCleaner cleaner) { |
| 207 this.cleaner = cleaner; | 210 this.cleaner = cleaner; |
| 208 } | 211 } |
| 209 | 212 |
| 213 | |
| 214 /** | |
| 215 * Returns the singleton of this Backend. | |
| 216 * | |
| 217 * @return the backend. | |
| 218 */ | |
| 219 public static synchronized Backend getInstance() { | |
| 220 if (instance == null) { | |
| 221 instance = new Backend(); | |
| 222 } | |
| 223 | |
| 224 return instance; | |
| 225 } | |
| 226 | |
| 210 /** | 227 /** |
| 211 * Sets the factory lookup mechanism to decouple ArtifactDatabase | 228 * Sets the factory lookup mechanism to decouple ArtifactDatabase |
| 212 * and Backend. | 229 * and Backend. |
| 213 * @param factoryLookup | 230 * @param factoryLookup |
| 214 */ | 231 */ |