Mercurial > dive4elements > river
comparison artifacts/src/main/java/org/dive4elements/river/utils/BatchLoader.java @ 9726:0a5239a1e46e 3.2.x
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| author | Tom Gottfried <tom@intevation.de> |
|---|---|
| date | Wed, 02 Mar 2022 10:26:50 +0100 |
| parents | b0c88ac9f63b |
| children |
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| 9725:da398790fa32 | 9726:0a5239a1e46e |
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| 12 import java.util.HashMap; | 12 import java.util.HashMap; |
| 13 import java.util.Iterator; | 13 import java.util.Iterator; |
| 14 import java.util.List; | 14 import java.util.List; |
| 15 import java.util.Map; | 15 import java.util.Map; |
| 16 | 16 |
| 17 import org.apache.log4j.Logger; | 17 import org.apache.logging.log4j.Logger; |
| 18 import org.apache.logging.log4j.LogManager; | |
| 18 import org.hibernate.SQLQuery; | 19 import org.hibernate.SQLQuery; |
| 19 import org.hibernate.Session; | 20 import org.hibernate.Session; |
| 20 | 21 |
| 21 /** To reduce the number of SQL queries send to the backend | 22 /** To reduce the number of SQL queries send to the backend |
| 22 * (mainly by the fixings overviews) we execute them in batches of ids | 23 * (mainly by the fixings overviews) we execute them in batches of ids |
| 25 * Is there a way to use Hibernate with java.sql.Array | 26 * Is there a way to use Hibernate with java.sql.Array |
| 26 * in cross database compatible manner? | 27 * in cross database compatible manner? |
| 27 */ | 28 */ |
| 28 public abstract class BatchLoader<T> { | 29 public abstract class BatchLoader<T> { |
| 29 | 30 |
| 30 private static Logger log = Logger.getLogger(BatchLoader.class); | 31 private static Logger log = LogManager.getLogger(BatchLoader.class); |
| 31 | 32 |
| 32 public static final int BATCH_SIZE = 100; | 33 public static final int BATCH_SIZE = 100; |
| 33 | 34 |
| 34 private Map<Integer, T> loaded; | 35 private Map<Integer, T> loaded; |
| 35 private List<Integer> rest; | 36 private List<Integer> rest; |