/*
* Copyright 2002-2009 the original author or authors.
*
* 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.springframework.jdbc.datasource;
import java.sql.Savepoint;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.transaction.CannotCreateTransactionException;
import org.springframework.transaction.NestedTransactionNotSupportedException;
import org.springframework.transaction.SavepointManager;
import org.springframework.transaction.TransactionException;
import org.springframework.transaction.TransactionSystemException;
import org.springframework.transaction.TransactionUsageException;
import org.springframework.transaction.support.SmartTransactionObject;
/**
* Convenient base class for JDBC-aware transaction objects.
* Can contain a {@link ConnectionHolder}, and implements the
* {@link org.springframework.transaction.SavepointManager}
* interface based on that ConnectionHolder.
*
* <p>Allows for programmatic management of JDBC 3.0
* {@link java.sql.Savepoint Savepoints}. Spring's
* {@link org.springframework.transaction.support.DefaultTransactionStatus}
* will automatically delegate to this, as it autodetects transaction
* objects that implement the SavepointManager interface.
*
* <p>Note that savepoints are only supported for drivers which
* support JDBC 3.0 or higher.
*
* @author Juergen Hoeller
* @since 1.1
*/
public abstract class JdbcTransactionObjectSupport implements SavepointManager, SmartTransactionObject {
private static final Log logger = LogFactory.getLog(JdbcTransactionObjectSupport.class);
private ConnectionHolder connectionHolder;
private Integer previousIsolationLevel;
private boolean savepointAllowed = false;
public void setConnectionHolder(ConnectionHolder connectionHolder) {
this.connectionHolder = connectionHolder;
}
public ConnectionHolder getConnectionHolder() {
return this.connectionHolder;
}
public boolean hasConnectionHolder() {
return (this.connectionHolder != null);
}
public void setPreviousIsolationLevel(Integer previousIsolationLevel) {
this.previousIsolationLevel = previousIsolationLevel;
}
public Integer getPreviousIsolationLevel() {
return this.previousIsolationLevel;
}
public void setSavepointAllowed(boolean savepointAllowed) {
this.savepointAllowed = savepointAllowed;
}
public boolean isSavepointAllowed() {
return this.savepointAllowed;
}
public void flush() {
// no-op
}
//---------------------------------------------------------------------
// Implementation of SavepointManager
//---------------------------------------------------------------------
/**
* This implementation creates a JDBC 3.0 Savepoint and returns it.
* @see java.sql.Connection#setSavepoint
*/
public Object createSavepoint() throws TransactionException {
ConnectionHolder conHolder = getConnectionHolderForSavepoint();
try {
if (!conHolder.supportsSavepoints()) {
throw new NestedTransactionNotSupportedException(
"Cannot create a nested transaction because savepoints are not supported by your JDBC driver");
}
}
catch (Throwable ex) {
throw new NestedTransactionNotSupportedException(
"Cannot create a nested transaction because your JDBC driver is not a JDBC 3.0 driver", ex);
}
try {
return conHolder.createSavepoint();
}
catch (Throwable ex) {
throw new CannotCreateTransactionException("Could not create JDBC savepoint", ex);
}
}
/**
* This implementation rolls back to the given JDBC 3.0 Savepoint.
* @see java.sql.Connection#rollback(java.sql.Savepoint)
*/
public void rollbackToSavepoint(Object savepoint) throws TransactionException {
try {
getConnectionHolderForSavepoint().getConnection().rollback((Savepoint) savepoint);
}
catch (Throwable ex) {
throw new TransactionSystemException("Could not roll back to JDBC savepoint", ex);
}
}
/**
* This implementation releases the given JDBC 3.0 Savepoint.
* @see java.sql.Connection#releaseSavepoint
*/
public void releaseSavepoint(Object savepoint) throws TransactionException {
try {
getConnectionHolderForSavepoint().getConnection().releaseSavepoint((Savepoint) savepoint);
}
catch (Throwable ex) {
logger.debug("Could not explicitly release JDBC savepoint", ex);
}
}
protected ConnectionHolder getConnectionHolderForSavepoint() throws TransactionException {
if (!isSavepointAllowed()) {
throw new NestedTransactionNotSupportedException(
"Transaction manager does not allow nested transactions");
}
if (!hasConnectionHolder()) {
throw new TransactionUsageException(
"Cannot create nested transaction if not exposing a JDBC transaction");
}
return getConnectionHolder();
}
}
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