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https://issues.apache.org/jira/browse/OFBIZ-11208?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16938584#comment-16938584
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Mathieu Lirzin commented on OFBIZ-11208:
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*Helper classes are supposed to be module like Classes (like
{{java.util.Collections}}) meaning a collection of functions with related usage
implemented in Java by a final class with only static method, with no state,
and with a private empty constructor. See
{{org.apache.ofbiz.manufacturing.bom.BOMHelper}} or
{{org.apache.ofbiz.manufacturing.jobshopmgt.ProductionRunHelper}} for good
examples.
However after looking at the current implementation of {{OrderReadHelper}} I
see that it is already failing to follow that convention which is a bug for the
mind, but that you are free to not fix.
> OrderReadHelper.getOrderItemAttributes as non static function
> -------------------------------------------------------------
>
> Key: OFBIZ-11208
> URL: https://issues.apache.org/jira/browse/OFBIZ-11208
> Project: OFBiz
> Issue Type: Improvement
> Components: order
> Affects Versions: Trunk
> Reporter: Nicolas Malin
> Assignee: Nicolas Malin
> Priority: Minor
>
> Currenlty if we use the java helper class OrderReadHelper to resolve the
> orderItemAttributes, it didn't use the a local cache and call each time the
> delegator throw a static function.
> I propose to use also as non static function optimise database calling when
> you have multiple get to do.
> Origin: On customer site we have a huge table orderItemAttributes (8M tuples)
> with several call. Use a local cache throw OrderReadHelper divide by nine the
> calling.
> {code:java}
> public String getOrderItemAttribute(String orderItemSeqId, String
> attributeName) {
> GenericValue orderItemAttribute = null;
> if (orderHeader != null) {
> if (orderItemAttributes == null) {
> try{
> orderItemAttributes =
> EntityQuery.use(orderHeader.getDelegator()) .from("OrderItemAttribute")
> .where("orderId", getOrderId()) .queryList();
> } catch (GenericEntityException e) { Debug.logError(e, module); }
> }
> orderItemAttribute = EntityUtil.getFirst(
> EntityUtil.filterByAnd(orderItemAttributes,
> UtilMisc.toMap("orderItemSeqId", orderItemSeqId, "attrName",
> attributeName)));
> }
> return orderItemAttribute != null ?
> orderItemAttribute.getString("attrValue"): null;
> }
> {code}
> At the first call, we populate the OrderReadHelper with all
> orderItemAttributes liked to an order, and after just filter with the
> orderItemSeqId and the attribute name wanted
> Example:
> {code:java}
> OrderReadHelper orh = new OrderReadHelper(orderHeader)
> ...
> for (GenericValue orderItem : orh.getOrderItems()) {
> listAttr <<
> [startValue :
> orh.getOrderItemAttribute(orderItem.orderItemSeqId, "MyStartValue"),
> endValue :
> orh.getOrderItemAttribute(orderItem.orderItemSeqId, "MyEndValue")]
> }
> {code}
> We request only for the first passage, after for all other line we use the
> local OrderReadHelper cache.
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