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From "Daniel John Debrunner (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-1275) Provide a way to enable client tracing without changing the application
Date Wed, 31 Jan 2007 23:51:06 GMT

    [ https://issues.apache.org/jira/browse/DERBY-1275?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12469264

Daniel John Debrunner commented on DERBY-1275:

Patch looks cleaner - thanks. Some minor issue, could be addressed after commit:

 - traceDirectory = "." + File.separator + "TraceDir"	+ File.separator;

   I don't think use of '.' for the current directory is portable, I think you can simply
use "TraceDir" here.

 - ClientSideSystemPropertiesTest
  private static String traceDirectory;
  Use of static fields in a JUnit test is not a good practice.
  Since the decorator will set the system property, you could just fetch the value of the
system property when you need it.
  BaseTestCase has a utility method to do that.

- In the client code the two identical anonymous inner classes could be combined into one
to reduce footprint by having
a private method in ClientBaseDataSource that gets the system property passed into it.

- You added a method to TestConfiguration - systemPropertiesSetupDecorator.
   I guess I didn't understand what value this adds. The decorators that are returned from
static methods
   in TestConfiguration are ones that modify the configuration, but where a decorator can
be used directly
   it is left as, which I think maps to the typical use of decorators in Junit.
   I think maybe the TestConfiguration class has already come too intertwined with decorators
and it might be better to have a Decorator class that just had static methods. This would
at least gather them in a single class so that they could be easily discovered. I think a
Decorator class would be a good place for the method you added.

> Provide a way to enable client tracing without changing the application
> -----------------------------------------------------------------------
>                 Key: DERBY-1275
>                 URL: https://issues.apache.org/jira/browse/DERBY-1275
>             Project: Derby
>          Issue Type: Improvement
>          Components: Network Client
>    Affects Versions:,
>            Reporter: Kathey Marsden
>         Assigned To: Mamta A. Satoor
>            Priority: Minor
>             Fix For:
>         Attachments: DERBY1275EnableClientTracingDiffV1.txt, DERBY1275EnableClientTracingDiffV2.txt,
DERBY1275EnableClientTracingDiffV3.txt, DERBY1275EnableClientTracingStatV1.txt, DERBY1275EnableClientTracingStatV2.txt,
> Currently  the client tracing can be enabled by  setting attributes on the client url,
setXXX methods on the DataSource or calling DriverManager.setLogWriter(), but it often cannot
be enabled in a deployed client application  because all of these API's require modification
of the application or its configuration files.
> It would be good to have a global way to turn on client tracing.  A system property pointing
to a property file is  one possibility but probably not ideal because of the impact in class
loader contexts.    I am not sure what the other possiblities are,

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