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SnappyData store based off Pivotal GemFireXD
/*
Derby - Class com.pivotal.gemfirexd.internal.jdbc.XAStatementControl
Licensed to the Apache Software Foundation (ASF) under one or more
contributor license agreements. See the NOTICE file distributed with
this work for additional information regarding copyright ownership.
The ASF licenses this file to You 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 com.pivotal.gemfirexd.internal.jdbc;
import com.pivotal.gemfirexd.internal.iapi.jdbc.BrokeredCallableStatement;
import com.pivotal.gemfirexd.internal.iapi.jdbc.BrokeredConnection;
import com.pivotal.gemfirexd.internal.iapi.jdbc.BrokeredPreparedStatement;
import com.pivotal.gemfirexd.internal.iapi.jdbc.BrokeredStatement;
import com.pivotal.gemfirexd.internal.iapi.jdbc.BrokeredStatementControl;
import com.pivotal.gemfirexd.internal.iapi.jdbc.EngineStatement;
import com.pivotal.gemfirexd.internal.impl.jdbc.EmbedConnection;
import com.pivotal.gemfirexd.internal.impl.jdbc.EmbedPreparedStatement;
import com.pivotal.gemfirexd.internal.impl.jdbc.EmbedResultSet;
import com.pivotal.gemfirexd.internal.impl.jdbc.EmbedStatement;
import java.sql.*;
/**
The Statement returned by an Connection returned by a XAConnection
needs to float across the underlying real connections. We do this by implementing
a wrapper statement.
*/
final class XAStatementControl implements BrokeredStatementControl {
/**
*/
private final EmbedXAConnection xaConnection;
private final BrokeredConnection applicationConnection;
BrokeredStatement applicationStatement;
private EmbedConnection realConnection;
private Statement realStatement;
private PreparedStatement realPreparedStatement;
private CallableStatement realCallableStatement;
private XAStatementControl(EmbedXAConnection xaConnection) {
this.xaConnection = xaConnection;
this.realConnection = xaConnection.realConnection;
this.applicationConnection = xaConnection.currentConnectionHandle;
}
XAStatementControl(EmbedXAConnection xaConnection,
Statement realStatement) throws SQLException {
this(xaConnection);
this.realStatement = realStatement;
this.applicationStatement = applicationConnection.newBrokeredStatement(this);
((EmbedStatement) realStatement).setApplicationStatement(
applicationStatement);
}
XAStatementControl(EmbedXAConnection xaConnection,
PreparedStatement realPreparedStatement,
String sql, Object generatedKeys) throws SQLException {
this(xaConnection);
this.realPreparedStatement = realPreparedStatement;
this.applicationStatement = applicationConnection.newBrokeredStatement(this, sql, generatedKeys);
((EmbedStatement) realPreparedStatement).setApplicationStatement(
applicationStatement);
}
XAStatementControl(EmbedXAConnection xaConnection,
CallableStatement realCallableStatement,
String sql) throws SQLException {
this(xaConnection);
this.realCallableStatement = realCallableStatement;
this.applicationStatement = applicationConnection.newBrokeredStatement(this, sql);
((EmbedStatement) realCallableStatement).setApplicationStatement(
applicationStatement);
}
public Statement getRealStatement() throws SQLException {
//
if (applicationConnection == xaConnection.currentConnectionHandle) {
// Application connection is the same.
if (realConnection == xaConnection.realConnection)
return realStatement;
// If we switched back to a local connection, and the first access is through
// a non-connection object (e.g. statement then realConnection will be null)
if (xaConnection.realConnection == null) {
// force the connection
xaConnection.getRealConnection();
}
// underlying connection has changed.
// create new Statement
Statement newStatement = applicationStatement.createDuplicateStatement(xaConnection.realConnection, realStatement);
((EmbedStatement) realStatement).transferBatch((EmbedStatement) newStatement);
try {
realStatement.close();
} catch (SQLException sqle) {
}
realStatement = newStatement;
realConnection = xaConnection.realConnection;
((EmbedStatement) realStatement).setApplicationStatement(
applicationStatement);
}
else {
// application connection is different, therefore the outer application
// statement is closed, so just return the realStatement. It should be
// closed by virtue of its application connection being closed.
}
return realStatement;
}
public PreparedStatement getRealPreparedStatement() throws SQLException {
//
if (applicationConnection == xaConnection.currentConnectionHandle) {
// Application connection is the same.
if (realConnection == xaConnection.realConnection)
return realPreparedStatement;
// If we switched back to a local connection, and the first access is through
// a non-connection object (e.g. statement then realConnection will be null)
if (xaConnection.realConnection == null) {
// force the connection
xaConnection.getRealConnection();
}
// underlying connection has changed.
// create new PreparedStatement
PreparedStatement newPreparedStatement =
((BrokeredPreparedStatement) applicationStatement).createDuplicateStatement(xaConnection.realConnection, realPreparedStatement);
// ((EmbedStatement) realPreparedStatement).transferBatch((EmbedStatement) newPreparedStatement);
((EmbedPreparedStatement) realPreparedStatement).transferParameters((EmbedPreparedStatement) newPreparedStatement);
try {
realPreparedStatement.close();
} catch (SQLException sqle) {
}
realPreparedStatement = newPreparedStatement;
realConnection = xaConnection.realConnection;
((EmbedStatement) realPreparedStatement).setApplicationStatement(
applicationStatement);
}
else {
// application connection is different, therefore the outer application
// statement is closed, so just return the realStatement. It should be
// closed by virtue of its application connection being closed.
}
return realPreparedStatement;
}
public CallableStatement getRealCallableStatement() throws SQLException {
if (applicationConnection == xaConnection.currentConnectionHandle) {
// Application connection is the same.
if (realConnection == xaConnection.realConnection)
return realCallableStatement;
// If we switched back to a local connection, and the first access is through
// a non-connection object (e.g. statement then realConnection will be null)
if (xaConnection.realConnection == null) {
// force the connection
xaConnection.getRealConnection();
}
// underlying connection has changed.
// create new PreparedStatement
CallableStatement newCallableStatement =
((BrokeredCallableStatement) applicationStatement).createDuplicateStatement(xaConnection.realConnection, realCallableStatement);
((EmbedStatement) realCallableStatement).transferBatch((EmbedStatement) newCallableStatement);
try {
realCallableStatement.close();
} catch (SQLException sqle) {
}
realCallableStatement = newCallableStatement;
realConnection = xaConnection.realConnection;
((EmbedStatement) realCallableStatement).setApplicationStatement(
applicationStatement);
}
else {
// application connection is different, therefore the outer application
// statement is closed, so just return the realStatement. It should be
// closed by virtue of its application connection being closed.
}
return realCallableStatement;
}
/**
* Don't need to wrap the ResultSet but do need to update its
* application Statement reference to be the one the application
* used to create the ResultSet.
*/
public ResultSet wrapResultSet(Statement s, ResultSet rs) {
if (rs != null)
((EmbedResultSet) rs).setApplicationStatement(s);
return rs;
}
/**
Can cursors be held across commits.
*/
public int checkHoldCursors(int holdability) throws SQLException {
return xaConnection.checkHoldCursors(holdability, true);
}
}