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https://issues.apache.org/jira/browse/DERBY-295?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12707112#action_12707112
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Kathey Marsden commented on DERBY-295:
--------------------------------------
I wonder if this is still relevant. For NetworkServerControl we have a public
API and ij has methods besides main you can call. I am thinking of closing
this Won't fix. Let me know if you object.
> Standardize calling mechanism for classes with main() routines
> --------------------------------------------------------------
>
> Key: DERBY-295
> URL: https://issues.apache.org/jira/browse/DERBY-295
> Project: Derby
> Issue Type: Improvement
> Components: Tools
> Affects Versions: 10.1.1.0
> Reporter: David Van Couvering
> Priority: Minor
>
> We need a standard, common agreed upon design pattern and mechanism for how
> applications can embed and invoke classes that have a main() routine in them,
> like ij, dblook, etc.
> See
>
> http://mail-archives.apache.org/mod_mbox/db-derby-dev/200504.mbox/%[email protected]%3e
> (or http://tinyurl.com/b4qjc)
> for the mail thread that discusses this.
> The conclusion was the following:
> - There should be a *non-static* public method that can be used to execute a
> class
> with a main() routine
> - Properties are set prior to calling this public method using the standard
> JavaBeans get/set pattern
> - We should have a new interface called Executable or something similar that
> defines this contract, and our tools should be modified to implement this
> interface
> - The main() routine should call this method after processing arguments.
> The Executable interface would look something like:
> public interface Executable
> {
> public void execute() throws Exception;
> }
> So then you would have:
> public class MyMain implements Executable
> {
> public int length;
> public int duration;
> public static void main(String[] args)
> {
> try
> {
> MyMain me = new myMain();
> me.processArgs(args);
> me.execute();
> }
> catch ( Exception e )
> {
> e.printStackTrace();
> System.exit(1);
> }
> System.exit(0);
> }
> public void processArgs(String[] args)
> {
> // handwaving around argument processing
> setLength(getLength(args));
> setDuration(getDuration(args));
> }
> public void setLength(int length)
> {
> this.length = length;
> }
> public void setDuration(int duration)
> {
> this.duration = duration;
> }
> public void execute() throws Exception
> {
> // this is where the real work happens...
> }
> }
> An example embedded use:
> MyTool tool = new MyTool();
> tool.setLength(2);
> tool.setDuration(12);
> tool.execute();
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