[hibernate-issues] [Hibernate-JIRA] Created: (HHH-6609) Provide a way to supply prebuild ConnectionProvider to Hibernate

[Christoph Läubrich (JIRA)]

Provide a way to supply prebuild ConnectionProvider to Hibernate
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                 Key: HHH-6609
                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-6609
             Project: Hibernate Core
          Issue Type: Improvement
          Components: core
    Affects Versions: 3.6.7
            Reporter: Christoph Läubrich


Currently it is only possible to provide a ConnectionProvider via the property Environment.CONNECTION_PROVIDER which only accepts a class-name which later is instantiated via ConnectionProviderFactory:
	private static ConnectionProvider initializeConnectionProviderFromConfig(String providerClass) {
		ConnectionProvider connections;
		try {
			log.info( "Initializing connection provider: " + providerClass );
			connections = (ConnectionProvider) ReflectHelper.classForName( providerClass ).newInstance();
		}
		catch ( Exception e ) {
			log.error( "Could not instantiate connection provider", e );
			throw new HibernateException( "Could not instantiate connection provider: " + providerClass );
		}
		return connections;
	}

This aproch is okay for connectionprovider which are very generic and can build up completely by the configuration, but under some circumstances the creation and setup is out of scope of the Provider implementation class.

For this case it would be helpfull to have a configuration property like Environment.CONNECTION_PROVIDER_REFERENCE and a static public Method in the ConnectionProviderFactory like

ConnectionProviderFactory.addConnectionProviderReference(ConnectionProvider provider, String reference)


So it would be possible to make something like this:
ConnectionProvider provider = new MySpecialProvider(x, y, z);
provider.doSpecialSetup(d);
ConnectionProviderFactory.addConnectionProviderReference(provider, "MySpecialProvider");
.
.
.
Configuration configuration = new Configuration();
configuration.setProperty(Environment.CONNECTION_PROVIDER_REFERENCE, "MySpecialProvider");
SessionFactory factory = configuration.buildSessionFactory();

The only alternative to this in current days is to create a ConnectionProvider class which completely relies on static setup methods, making the code relativly complicated and error prone, as well as introducing class not found problems if the provider is not in the same class loader context as hibernate or the module which creates the configuration (for example in OSGi applications).

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