Most users will probably find instantiating ComboPooledDataSource to be the most convenient approach. This makes them long and ugly, but correct. Users can add their own configuration information, usually to customize the behavior of ConnectionCustomizers. Unreferenced instances of PooledDataSource that are not close ed by clients close themselves prior to garbage collection in their finalize methods. Retrieved 1 January
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C-3PO 1 – Exclusive Preview!
C-3PO – Wikipedia
Excluding identity tokens from JMX names is particularly hazardous if you will initialize multiple DataSource from the same named configuration. If you use pooledDataSourceByName Also similar to C-3POit can respond to human gestures, but at a much more basic level, unlike the Star Wars droid.
Sign up at http: If you define your own ConnectionTester, it must implement the QueryConnectionTester interface for this parameter to be useful. My sessionFactory creation class is as below: Seconds a Connection can remain pooled but unused before being discarded.
See Locating Configuration Information. Statement pooling is thus turned off by default. You can achieve this by setting maxIdleTimeExcessConnections to a value much shorter than maxIdleTimeforcing Connections beyond your set minimum size to be released if they sit idle for more than a short period of time.
For these applications, we present a simplified precedence hierarchy:. You can mix c3p0 classes with compliant third-party implementations although not all c3p0 features will work with external implementations of ConnectionPoolDataSource. Statement and ResultSets are carefully cleaned up when pooled Connections and Statements are checked in, to c3o0 resource- exhaustion when clients use the lazy but common resource-management strategy of only cleaning up their Connections.
For a variety of reasons, c3pp0 users may prefer fewer, more global loggers. Whenever an unreturned Connection times out, that stack x3p0 will be printed, revealing where a Connection was checked out that was not checked in promptly.
Creating these connections is expensive—probably the most expensive single operation Hibernate will execute in a typical-use case. C3P0 offers a wide variety of options for controlling how quickly pools that have grown large under load revert to minPoolSizeand whether “old” Connections in the pool should be proactively replaced to maintain their reliablity.
Hibernate C3P0 Connection Pool Configuration Tutorial
Enhanced performance is the purpose of Connection and Statement pooling, and a major goal of the c3p0 library. You can also provide the fully-qualified classname of an implementation of the DefaultConnectionTester.
If you want to do something totally different, you can implement your own DefaultConnectionTester.
Retrieved 11 December But in theory, one VM might c3pp0 up two different DataSources, generated by two different VMs, that by unlikely coincidence have the same “identity token”, leading to errors as c33p0 of the two DataSources sneakily substitutes for the second. When a c3p0 DataSource attempts and fails to acquire a Connection, it will retry up to acquireRetryAttempts times, with a delay of acquireRetryDelay between each attempt.
Retrieved 26 May If c3p0’s Threads hold a reference to an AccessControlContext from the first client that hits them, it may be impossible to garbage collect a ClassLoader associated with that client when it is undeployed in a running VM.
But if you really need to, you can configure c3p0 to exclude the identityToken attribute from ObjectNames, cp30 that your PooledDataSources have predictable, reproducible names. Seconds before c3p0’s thread pool will try to interrupt an apparently hung task.
This may not be the most recent version of c3p0. From Wikipedia, the free encyclopedia. A family guy with c3o0 loving nature. The use of c3p0. Regardless of how you create your DataSource, c3p0 will use defaults for any configuration parameters that you do not specify programmatically. Configuration values programmatically set.
Retrieved 2 April