getComponent / Release Component

[Jan Hoskens]

Hi,
When editing my flowscript, I notice that there are some components that 
are used a lot.
Eg:

  var resolver = null;
  var filesource = null;
  try
  {
     resolver = 
cocoon.getComponent(Packages.org.apache.cocoon.environment.SourceResolver.ROLE);
     filesource = resolver.resolveURI(uri);
     return filesource.exists();
  }
  finally
  {
     if(filesource != null) resolver.release(filesource);
     cocoon.releaseComponent(resolver);
  }

Is it appropriate to declare these components that are used a lot as 
global variables? If I do set them globally, how do I release them?
Or are these getComponent/release couples no real threat to slow things 
down and am I only worried about code duplication?

Kind Regards,
Jan
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