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/*
* SonarQube
* Copyright (C) 2009-2021 SonarSource SA
* mailto:info AT sonarsource DOT com
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
package org.sonar.db;
import java.lang.reflect.Field;
import java.util.Objects;
import java.util.function.Supplier;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.defaults.DefaultSqlSession;
import org.sonar.api.utils.log.Logger;
import org.sonar.api.utils.log.Loggers;
import static com.google.common.base.Preconditions.checkState;
import static java.lang.String.format;
import static java.lang.Thread.currentThread;
public class DBSessionsImpl implements DBSessions {
private static final Logger LOG = Loggers.get(DBSessionsImpl.class);
private static final ThreadLocal<Boolean> CACHING_ENABLED = ThreadLocal.withInitial(() -> Boolean.FALSE);
private final ThreadLocal<DelegatingDbSessionSupplier> regularDbSession = ThreadLocal.withInitial(this::buildRegularDbSessionSupplier);
private final ThreadLocal<DelegatingDbSessionSupplier> batchDbSession = ThreadLocal.withInitial(this::buildBatchDbSessionSupplier);
private final MyBatis myBatis;
public DBSessionsImpl(MyBatis myBatis) {
this.myBatis = myBatis;
}
private DelegatingDbSessionSupplier buildRegularDbSessionSupplier() {
return new DelegatingDbSessionSupplier(() -> {
DbSession res = myBatis.openSession(false);
ensureAutoCommitFalse(res);
return res;
});
}
private DelegatingDbSessionSupplier buildBatchDbSessionSupplier() {
return new DelegatingDbSessionSupplier(() -> {
DbSession res = myBatis.openSession(true);
ensureAutoCommitFalse(res);
return res;
});
}
private static void ensureAutoCommitFalse(DbSession dbSession) {
try {
SqlSession sqlSession = dbSession.getSqlSession();
if (sqlSession instanceof DefaultSqlSession) {
Field f = sqlSession.getClass().getDeclaredField("autoCommit");
f.setAccessible(true);
checkState(!((boolean) f.get(sqlSession)), "Autocommit must be false");
}
} catch (NoSuchFieldException | IllegalAccessException e) {
LOG.debug("Failed to check the autocommit status of SqlSession: {}", e);
}
}
@Override
public void enableCaching() {
CACHING_ENABLED.set(Boolean.TRUE);
}
@Override
public DbSession openSession(boolean batch) {
if (!CACHING_ENABLED.get()) {
return myBatis.openSession(batch);
}
if (batch) {
return new NonClosingDbSession(batchDbSession.get().get());
}
return new NonClosingDbSession(regularDbSession.get().get());
}
@Override
public void disableCaching() {
close(regularDbSession, "regular");
close(batchDbSession, "batch");
regularDbSession.remove();
batchDbSession.remove();
CACHING_ENABLED.remove();
}
public void close(ThreadLocal<DelegatingDbSessionSupplier> dbSessionThreadLocal, String label) {
DelegatingDbSessionSupplier delegatingDbSessionSupplier = dbSessionThreadLocal.get();
boolean getCalled = delegatingDbSessionSupplier.isPopulated();
if (getCalled) {
try {
DbSession res = delegatingDbSessionSupplier.get();
res.close();
} catch (Exception e) {
LOG.error(format("Failed to close %s connection in %s", label, currentThread()), e);
}
}
}
/**
* A {@link Supplier} of {@link DelegatingDbSession} which logs whether {@link Supplier#get() get} has been called at
* least once, delegates the actual supplying to the a specific {@link Supplier<NonClosingDbSession>} instance and
* caches the supplied {@link NonClosingDbSession}.
*/
private static final class DelegatingDbSessionSupplier implements Supplier<DbSession> {
private final Supplier<DbSession> delegate;
private DbSession dbSession;
DelegatingDbSessionSupplier(Supplier<DbSession> delegate) {
this.delegate = delegate;
}
@Override
public DbSession get() {
if (dbSession == null) {
dbSession = Objects.requireNonNull(delegate.get());
}
return dbSession;
}
boolean isPopulated() {
return dbSession != null;
}
}
}
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