changes.txt

数据库连接池dbpool_v4.8.3.zip

21/07/2006 (v4.8.3)
	Workaround for locale-specific exceptions during date-formatting of log entries.
	Bug fix for recycling problem when connection's type map is null.

31/05/2006 (v4.8.2)
	Bug fix for handling of non-cached statements on connection closure/destruction.

07/04/2006 (v4.8.1)
	Moved pool initialization from ConnectionPool to ObjectPool to provide a generic implementation.
	Added ability to better specify method of item retrieval from pool (LIFO, FIFO, random).
	Added option to override default log file for each pool if required.
	Bug fix to avoid deadlock when statement caching is disabled.
	Bug fix for statements sometimes not getting recycled correctly after first use.

01/12/2005 (v4.8)
	Added support for caching of non-standard statement types (type/concurrency/holdability).
	Bug fixes in CacheConnection class.

14/11/2005 (v4.7.2)
	Fixed a memory leak in CacheConnection class (thanks to Jos van der Waal).
	Fixed a bug which set expiry to zero when maxpool=maxconn in pool manager (thanks to Russell Johnson).
	Changed default internal pool access method to LIFO instead of FIFO (better performance in low-load situations).

22/12/2004 (v4.7.1)
	Bug fix to ObjectPool hit rate counting.
	Bug fix to ConnectionPoolManager's logging mechanism. (Note: logging on new standalone ConnectionPools is now off by default, and should be enabled using one of the setLog() methods if required.)

14/12/2004 (v4.7)
	Bug fix for CacheConnection statement caching which prevented correct disabling of caching (thanks to Peter Van Caeseele).
	Changed logging in ConnectionPoolManager to support PrintStream instead of PrintWriter for more generalized stream support.
	Added support for pool event listeners.
	Added support for encoding of passwords in properties files.

06/10/2004 (v4.6.2)
	Updates to ConnectionPoolManager to allow more flexibility in specifying properties for initialization.
	Bug fix to ensure statements are released correctly if statement caching is disabled on a connection after initialization.
	Bug fix for connection creation which set statement caching based only on normal statements (thanks to Peter Van Caeseele).
	Finally added versioning to make life easier for everyone!
	Changes and clarifications to documentation.

12/07/2004 (v4.6.1)
	Bug fix for previous release which caused slowdown with large pool expiry values.

08/07/2004 (v4.6)
	Several access-level changes to clarify recommended use of ObjectPool
	Better check-in logic to avoid unnecessary disposal of some items
	Addition of connection validation at connection creation
	Removed redundant PoolSystem interface (it was allowing incorrect use of freeConnection(); only required to solve circularity in compilation, so now when compiling from source all files should be compiled at once)
	Overhaul of pool synchronization mechanism in response to some reported deadlock situations

02/06/2004 (v4.5.5)
	Minor adjustments to multithreading of cleaner thread causing possible deadlock in some circumstances.

11/05/2004 (v4.5.4)
	Fixed a bug with connection initialization in new pools (sometimes causing deadlock).
	Fixed a small problem with exception generation when problems encountered getting connections.

21/04/2004 (v4.5.3)
	Fixed a synchronization bug in ObjectPool code (thanks to Eric Gilbert).
	Fixed a minor ConnectionPoolManager bug relating to reading a null validator from the properties file.

07/04/2004 (v4.5.2)
	Fixed a synchronization bug in ObjectPool.Cleaner which sometimes caused hangups on returned connections.
	Fixed bug in ObjectPool checkOut method to more reliably return valid connections (thanks to Csaba Kert閟z).

18/10/2003 (v4.5.1)
	Updated ObjectPool code: more rigorous type-checking, and ability to specify user-definable List type for pool.
	Fixed bug in CacheConnection handling of cached statements.

15/10/2003 (v4.5)
	Changed pooling spec. to increase clarity - all connections over maxpool limit are destroyed when returned.
	Changed check frequency of ObjectPool's cleaner thread (allows quicker release if expiry set high), and added prevention of unnecessary cleaning when pool is inactive.
	Implemented caching of normal Statements in addition to PreparedStatements and CallableStatements.
	Added option to pass other properties to JDBC driver through properties file instead of in JDBC URL.
	Added method to change pool parameters.
	Changed ConnectionPoolManager to forcibly release pools when finished (provides guaranteed termination).
	Fixed bug in ConnectionPool.checkOut() methods which was throwing ClassCastExceptions.
	Changed ConnectionPool constructor to millisecond expiry time to be consistent with ObjectPool constructor.
	Changed initSize parameter to init for consistency.

26/09/2003 (v4.4)
	Changed ObjectPool to check items better when they are returned to the pool.
	Added check to avoid another attempt to close statements if they are closed before connection.
	Pooling system modified to track checked out items better, helping cleanup.

08/09/2003 (v4.3.1)
	Fixed bug in method which populates pool with open connections to avoid a possible endless loop - initConnections(num).

17/03/2003 (v4.3)
	Addition of more rigorous cleanup code for connections returning to pool.

04/02/2003 (v4.22)
	Fixed bug introduced to pool manager constructor code when multiple pool managers support added.
	Changed ConnectionPool to use seconds for expiry in constructor for conformity.

30/01/2003 (v4.21)
	Fixed bug in ObjectPool checkOut(timeout) code which was returning null connections.

10/01/2003 (v4.2)
	Added multiple pool manager support with user-specified properties files (backward-compatible).

12/12/2002 (v4.1)
	Asynchronous object destruction and pool release mechanisms added to ObjectPool, and support added to ConnectionPoolManager.
	Added interface to avoid compilation circularity between ConnectionPool and CacheConnection classes.

08/10/2002
	Source code made available for download.

25/04/2002 (v4.0)
	Support for new JDBC 3.0 interfaces, and package name change from slink.* to snaq.* to reflect new domain hosting.

19/02/2002 (v3.2)
	Changed ObjectPool statistical methods to public, and removed final modifier on ConnectionPool.

14/02/2002 (v3.1)
	Code added to perform better cleanup of PreparedStatements and CallableStatements that were cached when a Connection returned to a pool.
	The properties file has now been changed to "dbpool.properties" to address an incompatibility with JBoss configuration files.