> I wrote several servlets that access a MySQL database using a single,
> persistent, sychronized connection.
> public static synchronized MySQLConnection getInstance(){
> return theConnection;
> }
There's no use for synchronized keyword in that method. The method is
synchronized, NOT the returned connection.
If you want to use a synchronized connection, you should do something
like (maybe you do it already):
MySQLConnection mConn = MySQLConnection.getInstance();
synchronized ( mConn ) {
...
}
I've seen somewhere simple conn-pools that are used like this:
List connList = new Vector(); //List holding the connections
doXXX, service etc...:
1. remove the last element (connection) from the list.
1.1 if list was empty, create new connection.
2. use database with that connection.
3. put the connection back to list.
//1. :
conn = null;
synchronized ( connList ) {
if ( connList.isEmpty() ) {
//1.1
conn = ...
}
else {
conn = (Connection) connList.remove( connList.size() - 1 );
}
}
//2. :
//Do the DB
//3. :
connList.add( conn );
1.1 should also contain some sort of maxConnection -limitation.
I hope this gave you some idea...
-clapu
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