On 6/27/2016 4:35 PM, Jerry Malcolm wrote:
Mark,
On 6/27/2016 1:07 PM, Mark Thomas wrote:
On 27/06/2016 17:44, Jerry Malcolm wrote:
I'm assuming that context.lookup(...) simply locates the "jdbc/myDB"
<Resource> tag in the context.xml file, pulls all of the parms out of
that tag, creates a DataSource object utilizing the parms, and returns
it. If that's the case, couldn't I create a variation/subclass of
the
Context object that modifies the url parm that it found in the resource
tag and puts the desired db name into the url before constructing the
DataSource?
Sure.
You need to implement the appropriate factory and then specify your
factory class explicitly in the Resource element using the factory
attribute.
You probably want to start here for ideas on how to code up your
factory:
http://svn.apache.org/viewvc/tomcat/trunk/java/org/apache/naming/factory/
or for a more specific example:
http://svn.apache.org/viewvc/tomcat/trunk/java/org/apache/tomcat/dbcp/dbcp2/BasicDataSourceFactory.java?view=annotate
Mark
Mark,
It's been several months since we corresponded on this thread. I've
been working on other aspects of the project. But the time has arrived
that I have to get this working. Refresher.... I want to have one
generic <resource..... url="dbURL/%dbName%">. When I need an
instance, I pass a dbname to the factory and it builds the correct URL
substituting the desired dbName into the URL.
I have coded a subclass of BasicDataSourceFactory that has a new
getInstance( databaseName ) method on it. All I'm doing there is
getting the URL property from the common/generic <Resource> tag and
appending databaseName to the URL, then calling the parent
createDataSource( properties ) method. I believe that will do what I
need. Plus it compiles successfully.
Where I'm falling apart now is defining the resource tag(s) and
successfully coding the request to get an instance. Normally when I
reference a "<resource>" tag in my code [ ds =
(DataSource)envContext.lookup( dataSourceName ); ] the lookup
apparently uses the default datasourcefactory and returns a datasource.
Fine. But now I want to tell it use my subclass factory instead, and I
need to pass a parameter (the db name) in. So I 'think' I need to get an
instance of MyDataSourceFactory, then call my new method on it. But how
do I tell "envContext.lookup()" that I want to use my own factory and my
own custom method (with the additional parameter) to get the instance
from the factory? Or.... do I use "envContext.lookup() to lookup and
give me an instance of my FACTORY, and then simply call my method on my
factory to get the ds? Either way, I'm hitting wall on how to do it.
Thanks.
Jerry
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