pivot & static
--------------
Key: PIVOT-743
URL: https://issues.apache.org/jira/browse/PIVOT-743
Project: Pivot
Issue Type: Improvement
Reporter: Andrei Pozolotin
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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