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Commons Database Connection Pooling (See PATCHES.TXT in jar)
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/*
* 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.dbcp;
import java.io.IOException;
import java.io.InputStream;
import java.sql.CallableStatement;
import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.Driver;
import java.sql.DriverManager;
import java.sql.DriverPropertyInfo;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.sql.SQLWarning;
import java.sql.Statement;
import java.util.HashMap;
import java.util.Map;
import java.util.NoSuchElementException;
import java.util.Properties;
import java.util.Set;
import org.apache.commons.jocl.JOCLContentHandler;
import org.apache.commons.pool.ObjectPool;
import org.xml.sax.SAXException;
/**
* A {@link Driver} implementation that obtains
* {@link Connection}s from a registered
* {@link ObjectPool}.
*
* @author Rodney Waldhoff
* @author Dirk Verbeeck
* @version $Revision: 902692 $ $Date: 2010-01-24 22:28:54 -0500 (Sun, 24 Jan 2010) $
*/
public class PoolingDriver implements Driver {
/** Register myself with the {@link DriverManager}. */
static {
try {
DriverManager.registerDriver(new PoolingDriver());
} catch(Exception e) {
}
}
/** The map of registered pools. */
protected static final HashMap _pools = new HashMap();
/** Controls access to the underlying connection */
private static boolean accessToUnderlyingConnectionAllowed = false;
public PoolingDriver() {
}
/**
* Returns the value of the accessToUnderlyingConnectionAllowed property.
*
* @return true if access to the underlying is allowed, false otherwise.
*/
public static synchronized boolean isAccessToUnderlyingConnectionAllowed() {
return accessToUnderlyingConnectionAllowed;
}
/**
* Sets the value of the accessToUnderlyingConnectionAllowed property.
* It controls if the PoolGuard allows access to the underlying connection.
* (Default: false)
*
* @param allow Access to the underlying connection is granted when true.
*/
public static synchronized void setAccessToUnderlyingConnectionAllowed(boolean allow) {
accessToUnderlyingConnectionAllowed = allow;
}
/**
* WARNING: This method throws DbcpExceptions (RuntimeExceptions)
* and will be replaced by the protected getConnectionPool method.
*
* @deprecated This will be removed in a future version of DBCP.
*/
public synchronized ObjectPool getPool(String name) {
try {
return getConnectionPool(name);
}
catch (Exception e) {
throw new DbcpException(e);
}
}
public synchronized ObjectPool getConnectionPool(String name) throws SQLException {
ObjectPool pool = (ObjectPool)(_pools.get(name));
if(null == pool) {
InputStream in = this.getClass().getResourceAsStream(String.valueOf(name) + ".jocl");
if (in == null) {
in = Thread.currentThread().getContextClassLoader(
).getResourceAsStream(String.valueOf(name) + ".jocl");
}
if(null != in) {
JOCLContentHandler jocl = null;
try {
jocl = JOCLContentHandler.parse(in);
}
catch (SAXException e) {
throw (SQLException) new SQLException("Could not parse configuration file").initCause(e);
}
catch (IOException e) {
throw (SQLException) new SQLException("Could not load configuration file").initCause(e);
}
if(jocl.getType(0).equals(String.class)) {
pool = getPool((String)(jocl.getValue(0)));
if(null != pool) {
registerPool(name,pool);
}
} else {
pool = ((PoolableConnectionFactory)(jocl.getValue(0))).getPool();
if(null != pool) {
registerPool(name,pool);
}
}
}
else {
throw new SQLException("Configuration file not found");
}
}
return pool;
}
public synchronized void registerPool(String name, ObjectPool pool) {
_pools.put(name,pool);
}
public synchronized void closePool(String name) throws SQLException {
ObjectPool pool = (ObjectPool) _pools.get(name);
if (pool != null) {
_pools.remove(name);
try {
pool.close();
}
catch (Exception e) {
throw (SQLException) new SQLException("Error closing pool " + name).initCause(e);
}
}
}
public synchronized String[] getPoolNames(){
Set names = _pools.keySet();
return (String[]) names.toArray(new String[names.size()]);
}
public boolean acceptsURL(String url) throws SQLException {
try {
return url.startsWith(URL_PREFIX);
} catch(NullPointerException e) {
return false;
}
}
public Connection connect(String url, Properties info) throws SQLException {
if(acceptsURL(url)) {
ObjectPool pool = getConnectionPool(url.substring(URL_PREFIX_LEN));
if(null == pool) {
throw new SQLException("No pool found for " + url + ".");
} else {
try {
Connection conn = (Connection)(pool.borrowObject());
if (conn != null) {
conn = new PoolGuardConnectionWrapper(pool, conn);
}
return conn;
} catch(SQLException e) {
throw e;
} catch(NoSuchElementException e) {
throw (SQLException) new SQLException("Cannot get a connection, pool error: " + e.getMessage()).initCause(e);
} catch(RuntimeException e) {
throw e;
} catch(Exception e) {
throw (SQLException) new SQLException("Cannot get a connection, general error: " + e.getMessage()).initCause(e);
}
}
} else {
return null;
}
}
/**
* Invalidates the given connection.
*
* @param conn connection to invalidate
* @throws SQLException if the connection is not a
* PoolGuardConnectionWrapper or an error occurs invalidating
* the connection
* @since 1.2.2
*/
public void invalidateConnection(Connection conn) throws SQLException {
if (conn instanceof PoolGuardConnectionWrapper) { // normal case
PoolGuardConnectionWrapper pgconn = (PoolGuardConnectionWrapper) conn;
ObjectPool pool = pgconn.pool;
Connection delegate = pgconn.delegate;
try {
pool.invalidateObject(delegate);
}
catch (Exception e) {
}
pgconn.delegate = null;
}
else {
throw new SQLException("Invalid connection class");
}
}
public int getMajorVersion() {
return MAJOR_VERSION;
}
public int getMinorVersion() {
return MINOR_VERSION;
}
public boolean jdbcCompliant() {
return true;
}
public DriverPropertyInfo[] getPropertyInfo(String url, Properties info) {
return new DriverPropertyInfo[0];
}
/** My URL prefix */
protected static final String URL_PREFIX = "jdbc:apache:commons:dbcp:";
protected static final int URL_PREFIX_LEN = URL_PREFIX.length();
// version numbers
protected static final int MAJOR_VERSION = 1;
protected static final int MINOR_VERSION = 0;
/**
* PoolGuardConnectionWrapper is a Connection wrapper that makes sure a
* closed connection cannot be used anymore.
*/
static private class PoolGuardConnectionWrapper extends DelegatingConnection {
private final ObjectPool pool;
private Connection delegate;
PoolGuardConnectionWrapper(ObjectPool pool, Connection delegate) {
super(delegate);
this.pool = pool;
this.delegate = delegate;
}
protected void checkOpen() throws SQLException {
if(delegate == null) {
throw new SQLException("Connection is closed.");
}
}
public void close() throws SQLException {
if (delegate != null) {
this.delegate.close();
this.delegate = null;
super.setDelegate(null);
}
}
public boolean isClosed() throws SQLException {
if (delegate == null) {
return true;
}
return delegate.isClosed();
}
public void clearWarnings() throws SQLException {
checkOpen();
delegate.clearWarnings();
}
public void commit() throws SQLException {
checkOpen();
delegate.commit();
}
public Statement createStatement() throws SQLException {
checkOpen();
return new DelegatingStatement(this, delegate.createStatement());
}
public Statement createStatement(int resultSetType, int resultSetConcurrency) throws SQLException {
checkOpen();
return new DelegatingStatement(this, delegate.createStatement(resultSetType, resultSetConcurrency));
}
public boolean equals(Object obj) {
if (delegate == null){
return false;
}
return delegate.equals(obj);
}
public boolean getAutoCommit() throws SQLException {
checkOpen();
return delegate.getAutoCommit();
}
public String getCatalog() throws SQLException {
checkOpen();
return delegate.getCatalog();
}
public DatabaseMetaData getMetaData() throws SQLException {
checkOpen();
return delegate.getMetaData();
}
public int getTransactionIsolation() throws SQLException {
checkOpen();
return delegate.getTransactionIsolation();
}
public Map getTypeMap() throws SQLException {
checkOpen();
return delegate.getTypeMap();
}
public SQLWarning getWarnings() throws SQLException {
checkOpen();
return delegate.getWarnings();
}
public int hashCode() {
if (delegate == null){
return 0;
}
return delegate.hashCode();
}
public boolean isReadOnly() throws SQLException {
checkOpen();
return delegate.isReadOnly();
}
public String nativeSQL(String sql) throws SQLException {
checkOpen();
return delegate.nativeSQL(sql);
}
public CallableStatement prepareCall(String sql) throws SQLException {
checkOpen();
return new DelegatingCallableStatement(this, delegate.prepareCall(sql));
}
public CallableStatement prepareCall(String sql, int resultSetType, int resultSetConcurrency) throws SQLException {
checkOpen();
return new DelegatingCallableStatement(this, delegate.prepareCall(sql, resultSetType, resultSetConcurrency));
}
public PreparedStatement prepareStatement(String sql) throws SQLException {
checkOpen();
return new DelegatingPreparedStatement(this, delegate.prepareStatement(sql));
}
public PreparedStatement prepareStatement(String sql, int resultSetType, int resultSetConcurrency) throws SQLException {
checkOpen();
return new DelegatingPreparedStatement(this, delegate.prepareStatement(sql, resultSetType, resultSetConcurrency));
}
public void rollback() throws SQLException {
checkOpen();
delegate.rollback();
}
public void setAutoCommit(boolean autoCommit) throws SQLException {
checkOpen();
delegate.setAutoCommit(autoCommit);
}
public void setCatalog(String catalog) throws SQLException {
checkOpen();
delegate.setCatalog(catalog);
}
public void setReadOnly(boolean readOnly) throws SQLException {
checkOpen();
delegate.setReadOnly(readOnly);
}
public void setTransactionIsolation(int level) throws SQLException {
checkOpen();
delegate.setTransactionIsolation(level);
}
public void setTypeMap(Map map) throws SQLException {
checkOpen();
delegate.setTypeMap(map);
}
public String toString() {
if (delegate == null){
return "NULL";
}
return delegate.toString();
}
public int getHoldability() throws SQLException {
checkOpen();
return delegate.getHoldability();
}
public void setHoldability(int holdability) throws SQLException {
checkOpen();
delegate.setHoldability(holdability);
}
public java.sql.Savepoint setSavepoint() throws SQLException {
checkOpen();
return delegate.setSavepoint();
}
public java.sql.Savepoint setSavepoint(String name) throws SQLException {
checkOpen();
return delegate.setSavepoint(name);
}
public void releaseSavepoint(java.sql.Savepoint savepoint) throws SQLException {
checkOpen();
delegate.releaseSavepoint(savepoint);
}
public void rollback(java.sql.Savepoint savepoint) throws SQLException {
checkOpen();
delegate.rollback(savepoint);
}
public Statement createStatement(int resultSetType, int resultSetConcurrency, int resultSetHoldability) throws SQLException {
checkOpen();
return new DelegatingStatement(this, delegate.createStatement(resultSetType, resultSetConcurrency, resultSetHoldability));
}
public CallableStatement prepareCall(String sql, int resultSetType, int resultSetConcurrency, int resultSetHoldability) throws SQLException {
checkOpen();
return new DelegatingCallableStatement(this, delegate.prepareCall(sql, resultSetType, resultSetConcurrency, resultSetHoldability));
}
public PreparedStatement prepareStatement(String sql, int autoGeneratedKeys) throws SQLException {
checkOpen();
return new DelegatingPreparedStatement(this, delegate.prepareStatement(sql, autoGeneratedKeys));
}
public PreparedStatement prepareStatement(String sql, int resultSetType, int resultSetConcurrency, int resultSetHoldability) throws SQLException {
checkOpen();
return new DelegatingPreparedStatement(this, delegate.prepareStatement(sql, resultSetType, resultSetConcurrency, resultSetHoldability));
}
public PreparedStatement prepareStatement(String sql, int[] columnIndexes) throws SQLException {
checkOpen();
return new DelegatingPreparedStatement(this, delegate.prepareStatement(sql, columnIndexes));
}
public PreparedStatement prepareStatement(String sql, String[] columnNames) throws SQLException {
checkOpen();
return new DelegatingPreparedStatement(this, delegate.prepareStatement(sql, columnNames));
}
/**
* @see org.apache.commons.dbcp.DelegatingConnection#getDelegate()
*/
public Connection getDelegate() {
if (isAccessToUnderlyingConnectionAllowed()) {
return super.getDelegate();
} else {
return null;
}
}
/**
* @see org.apache.commons.dbcp.DelegatingConnection#getInnermostDelegate()
*/
public Connection getInnermostDelegate() {
if (isAccessToUnderlyingConnectionAllowed()) {
return super.getInnermostDelegate();
} else {
return null;
}
}
}
}