Details

    • Type: Improvement
    • Status: Open
    • Priority: Major
    • Resolution: Unresolved
    • Affects Version/s: 2.0
    • Fix Version/s: 2.5, 2.2
    • Component/s: None
    • Labels:
      None

      Description

      Greg, hello:

      1) in this example you say:
      http://pivot.apache.org/tutorials/list-buttons.html
      "Note that this example makes use of the global resource cache to store the loaded images."

      2) which reminds of the "java evil singleton pattern"
      http://java.sun.com/developer/technicalArticles/Programming/singletons/
      http://www.ibm.com/developerworks/webservices/library/co-single/index.html
      http://beust.com/weblog/2011/03/10/rehabilitating-the-singleton-pattern/
      http://tech.puredanger.com/2007/07/03/pattern-hate-singleton/
      and the consensus seems to be:
      "Singletons are fine as long as you don't implement them with static"

      3) and pivot uses them freely; few examples

      public abstract class ApplicationContext {

      protected static ArrayList<Display> displays = new ArrayList<Display>();
      protected static ArrayList<Application> applications = new ArrayList<Application>();

      private static HashMap<URI, Object> resourceCache = new HashMap<URI, Object>();
      private static ResourceCacheDictionary resourceCacheDictionary = new ResourceCacheDictionary();

      public abstract class Theme {

      private static Theme theme = null;

      4) do you think is it feasible to convert all of pivot into SPI:

      ServiceLoader<PivotFrameworkFactory> loader = ServiceLoader.load(PivotFrameworkFactory.class);
      PivotFrameworkFactory factory = loader.iterator().next();
      Map<String, Object> config = new HashMap<String, Object>();
      PivotFramework framework = factory.newFramework(config);

      5) the two use cases that affect me now:
      a) applet reload shares static
      b) pivot + osgi (not sure yet if I can find a workaround; possibly depends on what you do about PIVOT-742 PIVOT-22)

      thank you;

      Andrei

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            • Assignee:
              smartini Sandro Martini
              Reporter:
              andrei.pozolotin Andrei Pozolotin
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              • Created:
                Updated: