Mercurial > dive4elements > river
diff flys-backend/src/main/java/de/intevation/flys/importer/ImporterSession.java @ 497:67fd63e4ef66
Importer: centralized caching
flys-backend/trunk@1851 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
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date | Sun, 08 May 2011 15:29:45 +0000 |
parents | |
children | 8ab04de0b879 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/flys-backend/src/main/java/de/intevation/flys/importer/ImporterSession.java Sun May 08 15:29:45 2011 +0000 @@ -0,0 +1,86 @@ +package de.intevation.flys.importer; + +import java.util.Iterator; +import java.util.Map; +import java.util.HashMap; + +import java.math.BigDecimal; + +import org.hibernate.SessionFactory; +import org.hibernate.Session; +import org.hibernate.Query; + +import de.intevation.flys.backend.SessionFactoryProvider; + +import de.intevation.flys.model.WstColumnValue; +import de.intevation.flys.model.WstColumn; + +public class ImporterSession +{ + private static final ThreadLocal<ImporterSession> SESSION = + new ThreadLocal<ImporterSession>() { + @Override + protected ImporterSession initialValue() { + return new ImporterSession(); + } + }; + + protected Session databaseSession; + + protected Map<WstColumnValueKey, WstColumnValue> wstColumnValues; + + public static ImporterSession getInstance() { + return SESSION.get(); + } + + public ImporterSession() { + SessionFactory sessionFactory = + SessionFactoryProvider.createSessionFactory(); + databaseSession = sessionFactory.openSession(); + } + + public Session getDatabaseSession() { + return databaseSession; + } + + public WstColumnValue getWstColumnValue( + WstColumn column, + BigDecimal position, + BigDecimal w + ) { + if (wstColumnValues == null) { + loadWstColumnValues(); + } + + WstColumnValueKey key = new WstColumnValueKey( + column.getId(), + position.doubleValue(), + w.doubleValue()); + + WstColumnValue wcv = wstColumnValues.get(key); + + if (wcv != null) { + return wcv; + } + + wcv = new WstColumnValue(column, position, w); + + databaseSession.save(wcv); + + wstColumnValues.put(key, wcv); + + return wcv; + } + + protected void loadWstColumnValues() { + wstColumnValues = new HashMap<WstColumnValueKey, WstColumnValue>(); + + Query query = databaseSession.createQuery("from WstColumnValue"); + + for (Iterator iter = query.iterate(); iter.hasNext();) { + WstColumnValue wcv = (WstColumnValue)iter.next(); + wstColumnValues.put(new WstColumnValueKey(wcv), wcv); + } + } +} +// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :