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Handling unbinding when nested txns are running on different DB [#161…
…113716]
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Siddharth Srivastava
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Nov 21, 2018
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32 changes: 32 additions & 0 deletions
32
...ore/src/main/java/in/cleartax/dropwizard/sharding/hibernate/MultiTenantSessionSource.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,32 @@ | ||
| /* | ||
| * Copyright 2018 Saurabh Agrawal (Cleartax) | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| * | ||
| */ | ||
|
|
||
| package in.cleartax.dropwizard.sharding.hibernate; | ||
|
|
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| import lombok.AllArgsConstructor; | ||
| import lombok.Builder; | ||
| import lombok.Value; | ||
| import org.hibernate.SessionFactory; | ||
|
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| @AllArgsConstructor | ||
| @Value | ||
| @Builder | ||
| public class MultiTenantSessionSource { | ||
| private SessionFactory sessionFactory; | ||
| private MultiTenantDataSourceFactory dataSourceFactory; | ||
| private MultiTenantUnitOfWorkAwareProxyFactory unitOfWorkAwareProxyFactory; | ||
| } |
162 changes: 162 additions & 0 deletions
162
.../src/main/java/in/cleartax/dropwizard/sharding/hibernate/MultiTenantUnitOfWorkAspect.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,162 @@ | ||
| package in.cleartax.dropwizard.sharding.hibernate; | ||
|
|
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| import io.dropwizard.hibernate.HibernateBundle; | ||
| import io.dropwizard.hibernate.UnitOfWork; | ||
| import org.hibernate.Session; | ||
| import org.hibernate.SessionFactory; | ||
| import org.hibernate.Transaction; | ||
| import org.hibernate.context.internal.ManagedSessionContext; | ||
|
|
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| import javax.annotation.Nullable; | ||
| import java.util.Map; | ||
| import java.util.Stack; | ||
|
|
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| import static com.google.common.base.Preconditions.checkNotNull; | ||
| import static java.util.Objects.requireNonNull; | ||
|
|
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| /** | ||
| * Created on 14/11/18 | ||
| */ | ||
| public class MultiTenantUnitOfWorkAspect { | ||
| private static ThreadLocal<Stack<Session>> CONTEXT_OPEN_SESSIONS = ThreadLocal.withInitial(Stack::new); | ||
|
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| private final Map<String, SessionFactory> sessionFactories; | ||
| // Context variables | ||
| @Nullable | ||
| private UnitOfWork unitOfWork; | ||
| @Nullable | ||
| private Session session; | ||
| @Nullable | ||
| private SessionFactory sessionFactory; | ||
|
|
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| public MultiTenantUnitOfWorkAspect(Map<String, SessionFactory> sessionFactories) { | ||
| this.sessionFactories = sessionFactories; | ||
| } | ||
|
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| public void beforeStart(@Nullable UnitOfWork unitOfWork) { | ||
| if (unitOfWork == null) { | ||
| return; | ||
| } | ||
| this.unitOfWork = unitOfWork; | ||
|
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| sessionFactory = sessionFactories.get(unitOfWork.value()); | ||
| if (sessionFactory == null) { | ||
| // If the user didn't specify the name of a session factory, | ||
| // and we have only one registered, we can assume that it's the right one. | ||
| if (unitOfWork.value().equals(HibernateBundle.DEFAULT_NAME) && sessionFactories.size() == 1) { | ||
| sessionFactory = sessionFactories.values().iterator().next(); | ||
| } else { | ||
| throw new IllegalArgumentException("Unregistered Hibernate bundle: '" + unitOfWork.value() + "'"); | ||
| } | ||
| } | ||
| session = sessionFactory.openSession(); | ||
| assert session != null; | ||
| try { | ||
| configureSession(); | ||
| bind(session); | ||
| beginTransaction(unitOfWork, session); | ||
| } catch (Throwable th) { | ||
| session.close(); | ||
| session = null; | ||
| unbind(sessionFactory); | ||
| throw th; | ||
| } | ||
| } | ||
|
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| public void afterEnd() { | ||
| if (unitOfWork == null || session == null) { | ||
| return; | ||
| } | ||
|
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||
| try { | ||
| commitTransaction(unitOfWork, session); | ||
| } catch (Exception e) { | ||
| rollbackTransaction(unitOfWork, session); | ||
| throw e; | ||
| } | ||
| // We should not close the session to let the lazy loading work during serializing a response to the client. | ||
| // If the response successfully serialized, then the session will be closed by the `onFinish` method | ||
| } | ||
|
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| public void onError() { | ||
| if (unitOfWork == null || session == null) { | ||
| return; | ||
| } | ||
|
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| try { | ||
| rollbackTransaction(unitOfWork, session); | ||
| } finally { | ||
| onFinish(); | ||
| } | ||
| } | ||
|
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| public void onFinish() { | ||
| try { | ||
| if (session != null) { | ||
| session.close(); | ||
| } | ||
| } finally { | ||
| session = null; | ||
| unbind(sessionFactory); | ||
| } | ||
| } | ||
|
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| protected void configureSession() { | ||
| checkNotNull(unitOfWork); | ||
| checkNotNull(session); | ||
| session.setDefaultReadOnly(unitOfWork.readOnly()); | ||
| session.setCacheMode(unitOfWork.cacheMode()); | ||
| session.setHibernateFlushMode(unitOfWork.flushMode()); | ||
| } | ||
|
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| private void beginTransaction(UnitOfWork unitOfWork, Session session) { | ||
| if (!unitOfWork.transactional()) { | ||
| return; | ||
| } | ||
| session.beginTransaction(); | ||
| } | ||
|
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| private void rollbackTransaction(UnitOfWork unitOfWork, Session session) { | ||
| if (!unitOfWork.transactional()) { | ||
| return; | ||
| } | ||
| final Transaction txn = session.getTransaction(); | ||
| if (txn != null && txn.getStatus().canRollback()) { | ||
| txn.rollback(); | ||
| } | ||
| } | ||
|
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| private void commitTransaction(UnitOfWork unitOfWork, Session session) { | ||
| if (!unitOfWork.transactional()) { | ||
| return; | ||
| } | ||
| final Transaction txn = session.getTransaction(); | ||
| if (txn != null && txn.getStatus().canRollback()) { | ||
| txn.commit(); | ||
| } | ||
| } | ||
|
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| protected Session getSession() { | ||
| return requireNonNull(session); | ||
| } | ||
|
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| protected SessionFactory getSessionFactory() { | ||
| return requireNonNull(sessionFactory); | ||
| } | ||
|
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| private void bind(Session session) { | ||
| CONTEXT_OPEN_SESSIONS.get().push(session); | ||
| ManagedSessionContext.bind(session); | ||
| } | ||
|
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| private void unbind(SessionFactory sessionFactory) { | ||
| ManagedSessionContext.unbind(sessionFactory); | ||
| // This defensive check is needed as in case of exception onFinish gets called multiple times. | ||
| if (!CONTEXT_OPEN_SESSIONS.get().isEmpty()) { | ||
| CONTEXT_OPEN_SESSIONS.get().pop(); | ||
| } | ||
| if (!CONTEXT_OPEN_SESSIONS.get().isEmpty()) { | ||
| ManagedSessionContext.bind(CONTEXT_OPEN_SESSIONS.get().peek()); | ||
| } | ||
| } | ||
| } |
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