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Apache Commons DBCP software implements Database Connection Pooling
/*
* 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 org.apache.commons.dbcp2.cpdsadapter;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import org.apache.commons.dbcp2.DelegatingConnection;
import org.apache.commons.dbcp2.DelegatingPreparedStatement;
/**
* This class is the Connection that will be returned
* from PooledConnectionImpl.getConnection().
* Most methods are wrappers around the jdbc 1.x Connection.
* A few exceptions include preparedStatement and close.
* In accordance with the jdbc specification this Connection cannot
* be used after closed() is called. Any further usage will result in an
* SQLException.
*
* ConnectionImpl extends DelegatingConnection to enable access to the
* underlying connection.
*
* @author John D. McNally
* @version $Id: ConnectionImpl.java 1658644 2015-02-10 08:59:07Z tn $
* @since 2.0
*/
class ConnectionImpl extends DelegatingConnection {
private final boolean accessToUnderlyingConnectionAllowed;
/** The object that instantiated this object */
private final PooledConnectionImpl pooledConnection;
/**
* Creates a ConnectionImpl.
*
* @param pooledConnection The PooledConnection that is calling the ctor.
* @param connection The JDBC 1.x Connection to wrap.
* @param accessToUnderlyingConnectionAllowed if true, then access is allowed to the underlying connection
*/
ConnectionImpl(PooledConnectionImpl pooledConnection,
Connection connection,
boolean accessToUnderlyingConnectionAllowed) {
super(connection);
this.pooledConnection = pooledConnection;
this.accessToUnderlyingConnectionAllowed =
accessToUnderlyingConnectionAllowed;
}
/**
* Marks the Connection as closed, and notifies the pool that the
* pooled connection is available.
* In accordance with the jdbc specification this Connection cannot
* be used after closed() is called. Any further usage will result in an
* SQLException.
*
* @exception SQLException The database connection couldn't be closed.
*/
@Override
public void close() throws SQLException {
if (!isClosedInternal()) {
try {
passivate();
} finally {
setClosedInternal(true);
pooledConnection.notifyListeners();
}
}
}
/**
* If pooling of PreparedStatements is turned on in the
* {@link DriverAdapterCPDS}, a pooled object may be returned, otherwise
* delegate to the wrapped jdbc 1.x {@link java.sql.Connection}.
*
* @param sql SQL statement to be prepared
* @return the prepared statement
* @exception SQLException if this connection is closed or an error occurs
* in the wrapped connection.
*/
@Override
public PreparedStatement prepareStatement(String sql) throws SQLException {
checkOpen();
try {
return new DelegatingPreparedStatement
(this, pooledConnection.prepareStatement(sql));
}
catch (SQLException e) {
handleException(e); // Does not return
return null;
}
}
/**
* If pooling of PreparedStatements is turned on in the
* {@link DriverAdapterCPDS}, a pooled object may be returned, otherwise
* delegate to the wrapped jdbc 1.x {@link java.sql.Connection}.
*
* @exception SQLException if this connection is closed or an error occurs
* in the wrapped connection.
*/
@Override
public PreparedStatement prepareStatement(String sql, int resultSetType,
int resultSetConcurrency)
throws SQLException {
checkOpen();
try {
return new DelegatingPreparedStatement
(this, pooledConnection.prepareStatement
(sql,resultSetType,resultSetConcurrency));
}
catch (SQLException e) {
handleException(e);
return null;
}
}
@Override
public PreparedStatement prepareStatement(String sql, int resultSetType,
int resultSetConcurrency,
int resultSetHoldability)
throws SQLException {
checkOpen();
try {
return new DelegatingPreparedStatement(this,
pooledConnection.prepareStatement(sql, resultSetType,
resultSetConcurrency, resultSetHoldability));
}
catch (SQLException e) {
handleException(e);
return null;
}
}
@Override
public PreparedStatement prepareStatement(String sql, int autoGeneratedKeys)
throws SQLException {
checkOpen();
try {
return new DelegatingPreparedStatement(this,
pooledConnection.prepareStatement(sql, autoGeneratedKeys));
}
catch (SQLException e) {
handleException(e);
return null;
}
}
@Override
public PreparedStatement prepareStatement(String sql, int columnIndexes[])
throws SQLException {
checkOpen();
try {
return new DelegatingPreparedStatement(this,
pooledConnection.prepareStatement(sql, columnIndexes));
}
catch (SQLException e) {
handleException(e);
return null;
}
}
@Override
public PreparedStatement prepareStatement(String sql, String columnNames[])
throws SQLException {
checkOpen();
try {
return new DelegatingPreparedStatement(this,
pooledConnection.prepareStatement(sql, columnNames));
}
catch (SQLException e) {
handleException(e);
return null;
}
}
//
// Methods for accessing the delegate connection
//
/**
* If false, getDelegate() and getInnermostDelegate() will return null.
* @return true if access is allowed to the underlying connection
* @see ConnectionImpl
*/
public boolean isAccessToUnderlyingConnectionAllowed() {
return accessToUnderlyingConnectionAllowed;
}
/**
* Get the delegated connection, if allowed.
* @return the internal connection, or null if access is not allowed.
* @see #isAccessToUnderlyingConnectionAllowed()
*/
@Override
public Connection getDelegate() {
if (isAccessToUnderlyingConnectionAllowed()) {
return getDelegateInternal();
}
return null;
}
/**
* Get the innermost connection, if allowed.
* @return the innermost internal connection, or null if access is not allowed.
* @see #isAccessToUnderlyingConnectionAllowed()
*/
@Override
public Connection getInnermostDelegate() {
if (isAccessToUnderlyingConnectionAllowed()) {
return super.getInnermostDelegateInternal();
}
return null;
}
}