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v2: Use H2 and Hibernate in backend module. Refactor UI Unit Tests to…
… be side effect free.
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TatuJLund
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Oct 1, 2024
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137 changes: 137 additions & 0 deletions
137
...ncreate-backend/src/main/java/org/vaadin/tatu/vaadincreate/backend/dao/HibernateUtil.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,137 @@ | ||
| package org.vaadin.tatu.vaadincreate.backend.dao; | ||
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| import java.util.function.Consumer; | ||
| import java.util.function.Function; | ||
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| import org.hibernate.Session; | ||
| import org.hibernate.SessionFactory; | ||
| import org.hibernate.cfg.Configuration; | ||
|
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| /** | ||
| * Utility class for managing Hibernate sessions and transactions. | ||
| */ | ||
| public class HibernateUtil { | ||
|
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| // Private constructor to prevent instantiation | ||
| private HibernateUtil() { | ||
| throw new UnsupportedOperationException("Utility class"); | ||
| } | ||
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| private static SessionFactory sessionFactory; | ||
|
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| static { | ||
| try { | ||
| sessionFactory = new Configuration().configure() | ||
| .buildSessionFactory(); | ||
| } catch (Exception ex) { | ||
| throw new ExceptionInInitializerError(ex); | ||
| } | ||
| } | ||
|
|
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| /** | ||
| * Retrieves the singleton instance of the SessionFactory. | ||
| * | ||
| * @return the SessionFactory instance used for creating Hibernate sessions. | ||
| */ | ||
| public static SessionFactory getSessionFactory() { | ||
| return sessionFactory; | ||
| } | ||
|
|
||
| /** | ||
| * Executes a function within a database transaction. | ||
| * | ||
| * @param <T> | ||
| * The type of the result returned by the transaction function. | ||
| * @param transaction | ||
| * A function that takes a Hibernate {@link Session} and returns | ||
| * a result. | ||
| * @return The result of the transaction function. | ||
| * @throws Exception | ||
| * if the transaction fails and is rolled back. | ||
| */ | ||
| public static <T> T inTransaction(Function<Session, T> transaction) { | ||
| var session = getSessionFactory().openSession(); | ||
| var tx = session.beginTransaction(); | ||
| T result; | ||
| try { | ||
| result = transaction.apply(session); | ||
| tx.commit(); | ||
| } catch (Exception e) { | ||
| tx.rollback(); | ||
| throw e; | ||
| } finally { | ||
| session.close(); | ||
| } | ||
| return result; | ||
| } | ||
|
|
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| /** | ||
| * Executes a given transaction within a Hibernate session. | ||
| * <p> | ||
| * This method opens a new session, begins a transaction, and executes the | ||
| * provided {@link Consumer} with the session. If the transaction is | ||
| * successful, it commits the transaction. If an exception occurs, it rolls | ||
| * back the transaction and rethrows the exception. The session is closed in | ||
| * the finally block to ensure it is always closed. | ||
| * | ||
| * @param transaction | ||
| * the {@link Consumer} that contains the operations to be | ||
| * performed within the transaction | ||
| * @throws Exception | ||
| * if an error occurs during the transaction, it is propagated | ||
| * after rolling back the transaction | ||
| */ | ||
| public static void inTransaction(Consumer<Session> transaction) { | ||
| var session = getSessionFactory().openSession(); | ||
| var tx = session.beginTransaction(); | ||
| try { | ||
| transaction.accept(session); | ||
| tx.commit(); | ||
| } catch (Exception e) { | ||
| tx.rollback(); | ||
| throw e; | ||
| } finally { | ||
| session.close(); | ||
| } | ||
| } | ||
|
|
||
| /** | ||
| * Executes a task within a Hibernate session and ensures the session is | ||
| * closed after the task is completed. | ||
| * | ||
| * @param <T> | ||
| * The type of the result returned by the task. | ||
| * @param task | ||
| * A function that takes a Hibernate {@link Session} and returns | ||
| * a result of type T. | ||
| * @return The result of the task. | ||
| */ | ||
| public static <T> T inSession(Function<Session, T> task) { | ||
| T result; | ||
| var session = getSessionFactory().openSession(); | ||
| try { | ||
| result = task.apply(session); | ||
| } finally { | ||
| session.close(); | ||
| } | ||
| return result; | ||
| } | ||
|
|
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| /** | ||
| * Executes a task within a Hibernate session. The session is opened before | ||
| * the task is executed and closed after the task completes, ensuring proper | ||
| * resource management. | ||
| * | ||
| * @param task | ||
| * a {@link Consumer} that accepts a {@link Session} and performs | ||
| * operations within that session. | ||
| */ | ||
| public static void inSession(Consumer<Session> task) { | ||
| var session = getSessionFactory().openSession(); | ||
| try { | ||
| task.accept(session); | ||
| } finally { | ||
| session.close(); | ||
| } | ||
| } | ||
| } |
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