/*
* 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 org.jdbi.v3.core.transaction;
import java.sql.Connection;
import java.sql.SQLException;
import java.sql.Savepoint;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import org.jdbi.v3.core.Handle;
import org.jdbi.v3.core.HandleCallback;
/**
* This <code>TransactionHandler</code> uses local JDBC transactions
* demarcated explicitly on the handle and passed through to be handled
* directly on the JDBC Connection instance.
*/
public class LocalTransactionHandler implements TransactionHandler
{
private final ConcurrentHashMap<Handle, LocalStuff> localStuff = new ConcurrentHashMap<>();
private final ThreadLocal<Boolean> didTxnRollback = ThreadLocal.withInitial(() -> false);
@Override
public void begin(Handle handle)
{
try {
if (!localStuff.containsKey(handle)) {
boolean initial = handle.getConnection().getAutoCommit();
localStuff.putIfAbsent(handle, new LocalStuff(initial));
handle.getConnection().setAutoCommit(false);
}
}
catch (SQLException e) {
throw new TransactionException("Failed to start transaction", e);
}
}
@Override
public void commit(Handle handle)
{
try {
handle.getConnection().commit();
}
catch (SQLException e) {
throw new TransactionException("Failed to commit transaction", e);
}
finally {
restoreAutoCommitState(handle);
}
}
@Override
public void rollback(Handle handle)
{
didTxnRollback.set(true);
try {
handle.getConnection().rollback();
}
catch (SQLException e) {
throw new TransactionException("Failed to rollback transaction", e);
}
finally {
restoreAutoCommitState(handle);
}
}
@Override
public void savepoint(Handle handle, String name)
{
final Connection conn = handle.getConnection();
try {
final Savepoint savepoint = conn.setSavepoint(name);
localStuff.get(handle).getSavepoints().put(name, savepoint);
}
catch (SQLException e) {
throw new TransactionException(String.format("Unable to create savepoint '%s'", name), e);
}
}
@Override
public void releaseSavepoint(Handle handle, String name)
{
final Connection conn = handle.getConnection();
try {
final Savepoint savepoint = localStuff.get(handle).getSavepoints().remove(name);
if (savepoint == null) {
throw new TransactionException(String.format("Attempt to rollback to non-existant savepoint, '%s'",
name));
}
conn.releaseSavepoint(savepoint);
}
catch (SQLException e) {
throw new TransactionException(String.format("Unable to create savepoint %s", name), e);
}
}
@Override
public void rollbackToSavepoint(Handle handle, String name)
{
final Connection conn = handle.getConnection();
try {
final Savepoint savepoint = localStuff.get(handle).getSavepoints().remove(name);
if (savepoint == null) {
throw new TransactionException(String.format("Attempt to rollback to non-existant savepoint, '%s'",
name));
}
conn.rollback(savepoint);
}
catch (SQLException e) {
throw new TransactionException(String.format("Unable to create savepoint %s", name), e);
}
}
@Override
public boolean isInTransaction(Handle handle)
{
try {
return !handle.getConnection().getAutoCommit();
}
catch (SQLException e) {
throw new TransactionException("Failed to test for transaction status", e);
}
}
@SuppressWarnings("unchecked")
@Override
public <R, X extends Exception> R inTransaction(Handle handle,
HandleCallback<R, X> callback) throws X
{
if (isInTransaction(handle)) {
throw new IllegalStateException("Already in transaction");
}
didTxnRollback.set(false);
final R returnValue;
try {
handle.begin();
returnValue = callback.withHandle(handle);
if (!didTxnRollback.get()) {
handle.commit();
}
}
catch (Exception e) {
try {
handle.rollback();
} catch (Exception rollback) {
e.addSuppressed(rollback);
}
throw (X) e;
}
didTxnRollback.remove();
return returnValue;
}
@Override
public <R, X extends Exception> R inTransaction(Handle handle,
TransactionIsolationLevel level,
HandleCallback<R, X> callback) throws X
{
final TransactionIsolationLevel initial = handle.getTransactionIsolationLevel();
try {
handle.setTransactionIsolation(level);
return inTransaction(handle, callback);
}
finally {
handle.setTransactionIsolation(initial);
}
}
private void restoreAutoCommitState(final Handle handle) {
try {
final LocalStuff stuff = localStuff.remove(handle);
if (stuff != null) {
handle.getConnection().setAutoCommit(stuff.getInitialAutocommit());
stuff.getSavepoints().clear();
}
} catch (SQLException e) {
throw new UnableToRestoreAutoCommitStateException(e);
} finally {
// prevent memory leak if rollback throws an exception
localStuff.remove(handle);
}
}
private static class LocalStuff
{
private final Map<String, Savepoint> savepoints = new HashMap<>();
private final boolean initialAutocommit;
LocalStuff(boolean initial)
{
this.initialAutocommit = initial;
}
Map<String, Savepoint> getSavepoints()
{
return savepoints;
}
boolean getInitialAutocommit()
{
return initialAutocommit;
}
}
}