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/**
* Copyright 2007-2012 Arthur Blake
*
* 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 net.sf.log4jdbc.sql.jdbcapi;
import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.Driver;
import java.sql.DriverManager;
import java.sql.DriverPropertyInfo;
import java.sql.SQLException;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import java.util.TreeSet;
import net.sf.log4jdbc.Properties;
import net.sf.log4jdbc.log.SpyLogDelegator;
import net.sf.log4jdbc.log.SpyLogFactory;
import net.sf.log4jdbc.sql.Spy;
import net.sf.log4jdbc.sql.rdbmsspecifics.MySqlRdbmsSpecifics;
import net.sf.log4jdbc.sql.rdbmsspecifics.OracleRdbmsSpecifics;
import net.sf.log4jdbc.sql.rdbmsspecifics.RdbmsSpecifics;
import net.sf.log4jdbc.sql.rdbmsspecifics.SqlServerRdbmsSpecifics;
/**
* A JDBC driver which is a facade that delegates to one or more real underlying
* JDBC drivers. The driver will spy on any other JDBC driver that is loaded,
* simply by prepending jdbc:log4 to the normal jdbc driver URL
* used by any other JDBC driver. The driver, by default, also loads several
* well known drivers at class load time, so that this driver can be
* "dropped in" to any Java program that uses these drivers without making any
* code changes.
*
* The well known driver classes that are loaded are:
*
*
*
*
*
oracle.jdbc.driver.OracleDriver
*
com.sybase.jdbc2.jdbc.SybDriver
*
net.sourceforge.jtds.jdbc.Driver
*
com.microsoft.jdbc.sqlserver.SQLServerDriver
*
com.microsoft.sqlserver.jdbc.SQLServerDriver
*
weblogic.jdbc.sqlserver.SQLServerDriver
*
com.informix.jdbc.IfxDriver
*
org.apache.derby.jdbc.ClientDriver
*
org.apache.derby.jdbc.EmbeddedDriver
*
com.mysql.jdbc.Driver
*
org.postgresql.Driver
*
org.hsqldb.jdbcDriver
*
org.h2.Driver
*
*
*
*
* Additional drivers can be set via a property: log4jdbc.drivers
* This can be either a single driver class name or a list of comma separated
* driver class names.
*
* The autoloading behavior can be disabled by setting a property:
* log4jdbc.auto.load.popular.drivers to false. If that is done, then
* the only drivers that log4jdbc will attempt to load are the ones specified
* in log4jdbc.drivers.
*
* If any of the above driver classes cannot be loaded, the driver continues on
* without failing.
*
* Note that the getMajorVersion, getMinorVersion and
* jdbcCompliant method calls attempt to delegate to the last
* underlying driver requested through any other call that accepts a JDBC URL.
*
* This can cause unexpected behavior in certain circumstances. For example,
* if one of these 3 methods is called before any underlying driver has been
* established, then they will return default values that might not be correct
* in all situations. Similarly, if this spy driver is used to spy on more than
* one underlying driver concurrently, the values returned by these 3 method
* calls may change depending on what the last underlying driver used was at the
* time. This will not usually be a problem, since the driver is retrieved by
* it's URL from the DriverManager in the first place (thus establishing an
* underlying real driver), and in most applications their is only one database.
*
*
Modifications for log4j2:
*
*
The initialization of all properties have been delegated to the class
* {@link net.sf.log4jdbc.log4j2.Properties}.
*
Modification of the method connect(String, Properties)
* in order to compute the time taken to open a connection to the database.
* Constructors of ConnectionSpy have been modified accordingly.
*
*
* @author Arthur Blake
* @author Frederic Bastian
* @author Mathieu Seppey
*/
public class DriverSpy implements Driver
{
/**
* The last actual, underlying driver that was requested via a URL.
*/
private Driver lastUnderlyingDriverRequested;
/**
* Maps driver class names to RdbmsSpecifics objects for each kind of
* database.
*/
private final static Map rdbmsSpecifics;
/**
* Default RdbmsSpecifics.
*/
static final RdbmsSpecifics defaultRdbmsSpecifics = new RdbmsSpecifics();
/**
* A SpyLogDelegator used here for logs internal to log4jdbc
* (see debug(String) method of SpyLogDelegator).
*/
static final SpyLogDelegator log = SpyLogFactory.getSpyLogDelegator();
/**
* A String representing the prefix of URL
* to use log4jdbc.
*/
static final private String log4jdbcUrlPrefix = "jdbc:log4";
/**
* Default constructor.
*/
public DriverSpy()
{
}
/**
* Static initializer.
*/
static
{
log.debug("DriverSpy intialization...");
// The Set of drivers that the log4jdbc driver will preload at instantiation
// time. The driver can spy on any driver type, it's just a little bit
// easier to configure log4jdbc if it's one of these types!
Set subDrivers = new TreeSet();
if (Properties.isAutoLoadPopularDrivers()) {
subDrivers.add("oracle.jdbc.driver.OracleDriver");
subDrivers.add("oracle.jdbc.OracleDriver");
subDrivers.add("com.sybase.jdbc2.jdbc.SybDriver");
subDrivers.add("net.sourceforge.jtds.jdbc.Driver");
// MS driver for Sql Server 2000
subDrivers.add("com.microsoft.jdbc.sqlserver.SQLServerDriver");
// MS driver for Sql Server 2005
subDrivers.add("com.microsoft.sqlserver.jdbc.SQLServerDriver");
subDrivers.add("weblogic.jdbc.sqlserver.SQLServerDriver");
subDrivers.add("com.informix.jdbc.IfxDriver");
subDrivers.add("org.apache.derby.jdbc.ClientDriver");
subDrivers.add("org.apache.derby.jdbc.EmbeddedDriver");
subDrivers.add("com.mysql.jdbc.Driver");
subDrivers.add("org.postgresql.Driver");
subDrivers.add("org.hsqldb.jdbcDriver");
subDrivers.add("org.h2.Driver");
}
// look for additional driver specified in properties
subDrivers.addAll(Properties.getAdditionalDrivers());
try {
DriverManager.registerDriver(new DriverSpy());
} catch (SQLException s) {
// this exception should never be thrown, JDBC just defines it
// for completeness
throw (RuntimeException) new RuntimeException
("could not register log4jdbc driver!").initCause(s);
}
// instantiate all the supported drivers and remove
// those not found
String driverClass;
for (Iterator i = subDrivers.iterator(); i.hasNext();) {
driverClass = i.next();
try {
Class.forName(driverClass);
log.debug(" FOUND DRIVER " + driverClass);
} catch (Throwable c) {
i.remove();
}
}
if (subDrivers.size() == 0) {
log.debug("WARNING! " +
"log4jdbc couldn't find any underlying jdbc drivers.");
}
SqlServerRdbmsSpecifics sqlServer = new SqlServerRdbmsSpecifics();
OracleRdbmsSpecifics oracle = new OracleRdbmsSpecifics();
MySqlRdbmsSpecifics mySql = new MySqlRdbmsSpecifics();
/** create lookup Map for specific rdbms formatters */
rdbmsSpecifics = new HashMap();
rdbmsSpecifics.put("oracle.jdbc.driver.OracleDriver", oracle);
rdbmsSpecifics.put("oracle.jdbc.OracleDriver", oracle);
rdbmsSpecifics.put("net.sourceforge.jtds.jdbc.Driver", sqlServer);
rdbmsSpecifics.put("com.microsoft.jdbc.sqlserver.SQLServerDriver",
sqlServer);
rdbmsSpecifics.put("weblogic.jdbc.sqlserver.SQLServerDriver", sqlServer);
rdbmsSpecifics.put("com.mysql.jdbc.Driver", mySql);
log.debug("DriverSpy intialization done.");
}
/**
* Get the RdbmsSpecifics object for a given Connection.
*
* @param conn JDBC connection to get RdbmsSpecifics for.
* @return RdbmsSpecifics for the given connection.
*/
static RdbmsSpecifics getRdbmsSpecifics(Connection conn)
{
String driverName = "";
try {
DatabaseMetaData dbm = conn.getMetaData();
driverName = dbm.getDriverName();
} catch (SQLException s) {
// silently fail
}
log.debug("driver name is " + driverName);
RdbmsSpecifics r = rdbmsSpecifics.get(driverName);
if (r == null) {
return defaultRdbmsSpecifics;
}
return r;
}
/**
* Get the major version of the driver. This call will be delegated to the
* underlying driver that is being spied upon (if there is no underlying
* driver found, then 1 will be returned.)
*
* @return the major version of the JDBC driver.
*/
@Override
public int getMajorVersion()
{
if (lastUnderlyingDriverRequested == null) {
return 1;
}
return lastUnderlyingDriverRequested.getMajorVersion();
}
/**
* Get the minor version of the driver. This call will be delegated to the
* underlying driver that is being spied upon (if there is no underlying
* driver found, then 0 will be returned.)
*
* @return the minor version of the JDBC driver.
*/
@Override
public int getMinorVersion()
{
if (lastUnderlyingDriverRequested == null) {
return 0;
}
return lastUnderlyingDriverRequested.getMinorVersion();
}
/**
* Report whether the underlying driver is JDBC compliant. If there is no
* underlying driver, false will be returned, because the driver cannot
* actually do any work without an underlying driver.
*
* @return true if the underlying driver is JDBC Compliant;
* false otherwise.
*/
@Override
public boolean jdbcCompliant()
{
return lastUnderlyingDriverRequested != null &&
lastUnderlyingDriverRequested.jdbcCompliant();
}
/**
* Returns true if this is a jdbc:log4 URL and if the URL is for
* an underlying driver that this DriverSpy can spy on.
*
* @param url JDBC URL.
*
* @return true if this Driver can handle the URL.
*
* @throws SQLException if a database access error occurs
*/
@Override
public boolean acceptsURL(String url) throws SQLException
{
Driver d = getUnderlyingDriver(url);
if (d != null) {
lastUnderlyingDriverRequested = d;
return true;
}
return false;
}
/**
* Given a jdbc:log4 type URL, find the underlying real driver
* that accepts the URL.
*
* @param url JDBC connection URL.
*
* @return Underlying driver for the given URL. Null is returned if the URL is
* not a jdbc:log4 type URL or there is no underlying
* driver that accepts the URL.
*
* @throws SQLException if a database access error occurs.
*/
private Driver getUnderlyingDriver(String url) throws SQLException
{
if (url.startsWith(log4jdbcUrlPrefix)) {
url = this.getRealUrl(url);
Enumeration e = DriverManager.getDrivers();
Driver d;
while (e.hasMoreElements()) {
d = e.nextElement();
if (d.acceptsURL(url)) {
return d;
}
}
}
return null;
}
/**
* Get the actual URL that the real driver expects
* (strip off #log4jdbcUrlPrefix from url).
*
* @param url A String corresponding to a JDBC url for log4jdbc.
* @return A String representing url
* with #log4jdbcUrlPrefix stripped off.
*/
private String getRealUrl(String url)
{
return url.substring(log4jdbcUrlPrefix.length());
}
/**
* Get a Connection to the database from the underlying driver that this
* DriverSpy is spying on. If logging is not enabled, an actual Connection to
* the database returned. If logging is enabled, a ConnectionSpy object which
* wraps the real Connection is returned.
*
* @param url JDBC connection URL
* .
* @param info a list of arbitrary string tag/value pairs as
* connection arguments. Normally at least a "user" and
* "password" property should be included.
*
* @return a Connection object that represents a
* connection to the URL.
*
* @throws SQLException if a database access error occurs
*/
@Override
public Connection connect(String url, java.util.Properties info) throws SQLException
{
Driver d = getUnderlyingDriver(url);
if (d == null) {
return null;
}
// get actual URL that the real driver expects
// (strip off #log4jdbcUrlPrefix from url)
url = this.getRealUrl(url);
lastUnderlyingDriverRequested = d;
long tstart = System.currentTimeMillis();
Connection c = d.connect(url, info);
if (c == null) {
throw new SQLException("invalid or unknown driver url: " + url);
}
if (log.isJdbcLoggingEnabled()) {
ConnectionSpy cspy = new ConnectionSpy(c, System.currentTimeMillis() - tstart);
RdbmsSpecifics r = null;
String dclass = d.getClass().getName();
if (dclass != null && dclass.length() > 0)
{
r = rdbmsSpecifics.get(dclass);
}
if (r == null)
{
r = defaultRdbmsSpecifics;
}
cspy.setRdbmsSpecifics(r);
return cspy;
}
return c;
}
/**
* Gets information about the possible properties for the underlying driver.
*
* @param url the URL of the database to which to connect
*
* @param info a proposed list of tag/value pairs that will be sent on
* connect open
* @return an array of DriverPropertyInfo objects describing
* possible properties. This array may be an empty array if no
* properties are required.
*
* @throws SQLException if a database access error occurs
*/
@Override
public DriverPropertyInfo[] getPropertyInfo(String url, java.util.Properties info)
throws SQLException
{
Driver d = getUnderlyingDriver(url);
if (d == null)
{
return new DriverPropertyInfo[0];
}
lastUnderlyingDriverRequested = d;
return d.getPropertyInfo(url, info);
}
protected void reportException(String methodCall, SQLException exception)
{
log.exceptionOccured((Spy) this, methodCall, exception, null, -1L);
}
}
