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MysqlPooledConnection.java
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Tue, Aug 20, 21:21
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R8218 ShoulderDB_ImportSegmentMeasureAnalyze
MysqlPooledConnection.java
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/*
Copyright (c) 2002, 2016, Oracle and/or its affiliates. All rights reserved.
The MySQL Connector/J is licensed under the terms of the GPLv2
<http://www.gnu.org/licenses/old-licenses/gpl-2.0.html>, like most MySQL Connectors.
There are special exceptions to the terms and conditions of the GPLv2 as it is applied to
this software, see the FOSS License Exception
<http://www.mysql.com/about/legal/licensing/foss-exception.html>.
This program is free software; you can redistribute it and/or modify it under the terms
of the GNU General Public License as published by the Free Software Foundation; version 2
of the License.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this
program; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth
Floor, Boston, MA 02110-1301 USA
*/
package
com.mysql.jdbc.jdbc2.optional
;
import
java.lang.reflect.Constructor
;
import
java.sql.Connection
;
import
java.sql.SQLException
;
import
java.util.HashMap
;
import
java.util.Iterator
;
import
java.util.Map
;
import
javax.sql.ConnectionEvent
;
import
javax.sql.ConnectionEventListener
;
import
javax.sql.PooledConnection
;
import
com.mysql.jdbc.ExceptionInterceptor
;
import
com.mysql.jdbc.SQLError
;
import
com.mysql.jdbc.Util
;
/**
* This class is used to wrap and return a physical connection within a logical handle. It also registers and notifies ConnectionEventListeners of any
* ConnectionEvents
*/
public
class
MysqlPooledConnection
implements
PooledConnection
{
private
static
final
Constructor
<?>
JDBC_4_POOLED_CONNECTION_WRAPPER_CTOR
;
static
{
if
(
Util
.
isJdbc4
())
{
try
{
JDBC_4_POOLED_CONNECTION_WRAPPER_CTOR
=
Class
.
forName
(
"com.mysql.jdbc.jdbc2.optional.JDBC4MysqlPooledConnection"
)
.
getConstructor
(
new
Class
[]
{
com
.
mysql
.
jdbc
.
Connection
.
class
});
}
catch
(
SecurityException
e
)
{
throw
new
RuntimeException
(
e
);
}
catch
(
NoSuchMethodException
e
)
{
throw
new
RuntimeException
(
e
);
}
catch
(
ClassNotFoundException
e
)
{
throw
new
RuntimeException
(
e
);
}
}
else
{
JDBC_4_POOLED_CONNECTION_WRAPPER_CTOR
=
null
;
}
}
protected
static
MysqlPooledConnection
getInstance
(
com
.
mysql
.
jdbc
.
Connection
connection
)
throws
SQLException
{
if
(!
Util
.
isJdbc4
())
{
return
new
MysqlPooledConnection
(
connection
);
}
return
(
MysqlPooledConnection
)
Util
.
handleNewInstance
(
JDBC_4_POOLED_CONNECTION_WRAPPER_CTOR
,
new
Object
[]
{
connection
},
connection
.
getExceptionInterceptor
());
}
/**
* The flag for an exception being thrown.
*/
public
static
final
int
CONNECTION_ERROR_EVENT
=
1
;
/**
* The flag for a connection being closed.
*/
public
static
final
int
CONNECTION_CLOSED_EVENT
=
2
;
private
Map
<
ConnectionEventListener
,
ConnectionEventListener
>
connectionEventListeners
;
private
Connection
logicalHandle
;
private
com
.
mysql
.
jdbc
.
Connection
physicalConn
;
private
ExceptionInterceptor
exceptionInterceptor
;
/**
* Construct a new MysqlPooledConnection and set instance variables
*
* @param connection
* physical connection to db
*/
public
MysqlPooledConnection
(
com
.
mysql
.
jdbc
.
Connection
connection
)
{
this
.
logicalHandle
=
null
;
this
.
physicalConn
=
connection
;
this
.
connectionEventListeners
=
new
HashMap
<
ConnectionEventListener
,
ConnectionEventListener
>();
this
.
exceptionInterceptor
=
this
.
physicalConn
.
getExceptionInterceptor
();
}
/**
* Adds ConnectionEventListeners to a hash table to be used for notification
* of ConnectionEvents
*
* @param connectioneventlistener
* listener to be notified with ConnectionEvents
*/
public
synchronized
void
addConnectionEventListener
(
ConnectionEventListener
connectioneventlistener
)
{
if
(
this
.
connectionEventListeners
!=
null
)
{
this
.
connectionEventListeners
.
put
(
connectioneventlistener
,
connectioneventlistener
);
}
}
/**
* Removes ConnectionEventListeners from hash table used for notification of
* ConnectionEvents
*
* @param connectioneventlistener
* listener to be removed
*/
public
synchronized
void
removeConnectionEventListener
(
ConnectionEventListener
connectioneventlistener
)
{
if
(
this
.
connectionEventListeners
!=
null
)
{
this
.
connectionEventListeners
.
remove
(
connectioneventlistener
);
}
}
/**
* Invoked by the container. Return a logicalHandle object that wraps a
* physical connection.
*
* @see java.sql.DataSource#getConnection()
*/
public
synchronized
Connection
getConnection
()
throws
SQLException
{
return
getConnection
(
true
,
false
);
}
protected
synchronized
Connection
getConnection
(
boolean
resetServerState
,
boolean
forXa
)
throws
SQLException
{
if
(
this
.
physicalConn
==
null
)
{
SQLException
sqlException
=
SQLError
.
createSQLException
(
"Physical Connection doesn't exist"
,
this
.
exceptionInterceptor
);
callConnectionEventListeners
(
CONNECTION_ERROR_EVENT
,
sqlException
);
throw
sqlException
;
}
try
{
if
(
this
.
logicalHandle
!=
null
)
{
((
ConnectionWrapper
)
this
.
logicalHandle
).
close
(
false
);
}
if
(
resetServerState
)
{
this
.
physicalConn
.
resetServerState
();
}
this
.
logicalHandle
=
ConnectionWrapper
.
getInstance
(
this
,
this
.
physicalConn
,
forXa
);
}
catch
(
SQLException
sqlException
)
{
callConnectionEventListeners
(
CONNECTION_ERROR_EVENT
,
sqlException
);
throw
sqlException
;
}
return
this
.
logicalHandle
;
}
/**
* Invoked by the container (not the client), and should close the physical
* connection. This will be called if the pool is destroyed or the
* connectionEventListener receives a connectionErrorOccurred event.
*
* @see java.sql.DataSource#close()
*/
public
synchronized
void
close
()
throws
SQLException
{
if
(
this
.
physicalConn
!=
null
)
{
this
.
physicalConn
.
close
();
this
.
physicalConn
=
null
;
}
if
(
this
.
connectionEventListeners
!=
null
)
{
this
.
connectionEventListeners
.
clear
();
this
.
connectionEventListeners
=
null
;
}
}
/**
* Notifies all registered ConnectionEventListeners of ConnectionEvents.
* Instantiates a new ConnectionEvent which wraps sqlException and invokes
* either connectionClose or connectionErrorOccurred on listener as
* appropriate.
*
* @param eventType
* value indicating whether connectionClosed or
* connectionErrorOccurred called
* @param sqlException
* the exception being thrown
*/
protected
synchronized
void
callConnectionEventListeners
(
int
eventType
,
SQLException
sqlException
)
{
if
(
this
.
connectionEventListeners
==
null
)
{
return
;
}
Iterator
<
Map
.
Entry
<
ConnectionEventListener
,
ConnectionEventListener
>>
iterator
=
this
.
connectionEventListeners
.
entrySet
().
iterator
();
ConnectionEvent
connectionevent
=
new
ConnectionEvent
(
this
,
sqlException
);
while
(
iterator
.
hasNext
())
{
ConnectionEventListener
connectioneventlistener
=
iterator
.
next
().
getValue
();
if
(
eventType
==
CONNECTION_CLOSED_EVENT
)
{
connectioneventlistener
.
connectionClosed
(
connectionevent
);
}
else
if
(
eventType
==
CONNECTION_ERROR_EVENT
)
{
connectioneventlistener
.
connectionErrorOccurred
(
connectionevent
);
}
}
}
protected
ExceptionInterceptor
getExceptionInterceptor
()
{
return
this
.
exceptionInterceptor
;
}
}
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