Nicolas Malin created OFBIZ-6298:
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Summary: Java collection use optimized
Key: OFBIZ-6298
URL:
https://issues.apache.org/jira/browse/OFBIZ-6298 Project: OFBiz
Issue Type: Improvement
Components: ALL COMPONENTS
Affects Versions: Trunk
Reporter: Nicolas Malin
Assignee: Nicolas Malin
Priority: Minor
With the javolution collection cleaning (OFBIZ-5169,OFBIZ-5781) , we need to realize a second pass to control what instantiation would be better.
For List between LinkedList, ArrayList
{quote}
Using ArrayList, rather than LinkedList, as a default is a good approach because ArrayList will work better in most situations (in terms of algorithmic runtimes and memory footprints).
However I think it is important to wisely choose ArrayList or LinkedList based on the context, because sometimes a linked list may be a better choice: I am not saying we should do it now and we can tackle this at a later moment, possibly focusing only on list that can be very big and analyzing their usage to see if array or linked list is better; it would be also nice, when we use ArrayList, to see if we can predict the capacity of the list and allocate it at creation: if we can do this we will have a more predictable memory usage and less unpredictable peaks under heavy load (when the array capacity is reached and the array is copied to a new one with double capacity).
{quote}
more documentation on :
*
https://docs.oracle.com/javase/tutorial/collections/implementations/list.html *
http://stackoverflow.com/questions/322715/when-to-use-linkedlist-over-arraylistFor Map between HashMap and LinkedHashMap :
{quote}
Javolution Map Iterators return items in insertion sequence (HashMap does not), so any code relying on the original insertion order must use a LinkedHashMap.
{quote}
*
http://stackoverflow.com/questions/2889777/difference-between-hashmap-linkedhashmap-and-treemapIf you detect an optimization, please comments this issues
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