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/* Copyright (c) 2001-2019, The HSQL Development Group
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package org.hsqldb.jdbc.pool;
import org.hsqldb.jdbc.JDBCConnection;
import java.sql.SQLException;
import java.sql.Savepoint;
// @(#)$Id: JDBCXAConnectionWrapper.java 5969 2019-04-27 14:59:54Z fredt $
/**
* This is a wrapper class for JDBCConnection objects (not java.sql.XAConnection
* objects).
* Purpose of this class is to intercept and handle XA-related operations
* according to chapter 12 of the JDBC 3.0 specification, by returning this
* wrapped JDBCConnection to end-users.
* Global transaction services and XAResources will not use this wrapper.
*
* The new implementation extends JDBCConnection. A new object is created
* based on the session / session proxy of the JDBCXAConnection object in the
* constructor. (fredt)
*
* @version 2.2.9
* @since 2.0.0
* @author Blaine Simpson (blaine dot simpson at admc dot com)
* @see org.hsqldb.jdbc.JDBCConnection
*/
public class JDBCXAConnectionWrapper extends JDBCConnection {
/*
* A critical question: One responsibility of this
* class is to intercept invocations of commit(), rollback(),
* savePoint methods, etc. But, what about if user issues the
* corresponding SQL commands? What is the point to intercepting
* Connection.commit() here if end-users can execute the SQL command
* "COMMIT" and bypass interception?
* Similarly, what about DDL commands that cause an explicit commit?
* - blaine
* If we want, we can stop various statement categories from running
* during an XA transaction. May do so in the future - fredt
*/
/**
* Interceptor method, because this method is prohibited within
* any global transaction.
* See section 1.2.4 of the JDBC 3.0 spec.
*
* @param autoCommit
* @throws SQLException on error
*/
public void setAutoCommit(boolean autoCommit) throws SQLException {
validateNotWithinTransaction();
super.setAutoCommit(autoCommit);
}
/**
* Interceptor method, because this method is prohibited within
* any global transaction.
* See section 1.2.4 of the JDBC 3.0 spec.
*
* @throws SQLException on error
*/
public void commit() throws SQLException {
validateNotWithinTransaction();
super.commit();
}
/**
* Interceptor method, because this method is prohibited within
* any global transaction.
* See section 1.2.4 of the JDBC 3.0 spec.
*
* @throws SQLException on error
*/
public void rollback() throws SQLException {
validateNotWithinTransaction();
super.rollback();
}
/**
* Interceptor method, because this method is prohibited within
* any global transaction.
* See section 1.2.4 of the JDBC 3.0 spec.
*
* @throws SQLException on error
*/
public void rollback(Savepoint savepoint) throws SQLException {
validateNotWithinTransaction();
super.rollback(savepoint);
}
/**
* Interceptor method, because this method is prohibited within
* any global transaction.
* See section 1.2.4 of the JDBC 3.0 spec.
*
* @throws SQLException on error
*/
public Savepoint setSavepoint() throws SQLException {
validateNotWithinTransaction();
return super.setSavepoint();
}
/**
* Interceptor method, because this method is prohibited within
* any global transaction.
* See section 1.2.4 of the JDBC 3.0 spec.
*/
public Savepoint setSavepoint(String name) throws SQLException {
validateNotWithinTransaction();
return super.setSavepoint(name);
}
/**
* Interceptor method, because there may be XA implications to
* calling the method within a global transaction.
* See section 1.2.4 of the JDBC 3.0 spec.
*
* HSQLDB does not allow changing the isolation level inside a transaction
* of any kind.
*
* @param level isolation level
*/
public void setTransactionIsolation(int level) throws SQLException {
validateNotWithinTransaction();
super.setTransactionIsolation(level);
}
//---------------------- NON-INTERFACE METHODS -----------------------------
private JDBCXAResource xaResource;
public JDBCXAConnectionWrapper(JDBCXAResource xaResource,
JDBCXAConnection xaConnection,
JDBCConnection databaseConnection)
throws SQLException {
// todo: Review JDBCXADataSource and this class.
// Under current implementation, because we do not pass a
// JDBCXAConnection instance to the constructor to pick
// up the connectionClosed event listener callback, calling
// close() on this wrapper connection does not reset the
// physical connection or set the inUse flag to false until
// the vending JDBCXAConnection itself is closed, which marks
// the end of its useful life.
//
// In other words, due to this current implementation detail,
// JDBCXADataSource cannot cooperate with a pooling implementation
// to reuse physical connections.
// fixed - the event listener works
super(databaseConnection, xaConnection);
xaResource.setConnection(this);
this.xaResource = xaResource;
}
/**
* Throws a SQLException if within a Global transaction.
*
* @throws SQLException if within a Global transaction.
*/
private void validateNotWithinTransaction() throws SQLException {
if (xaResource.withinGlobalTransaction()) {
throw new SQLException(
"Method prohibited within a global transaction");
}
}
}