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https://issues.apache.org/jira/browse/OFBIZ-1723?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sharan Foga updated OFBIZ-1723:
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Sprint: Bug Crush Event - 21/2/2015
> Provides the core code to iterate next and previous through a table or view
> ---------------------------------------------------------------------------
>
> Key: OFBIZ-1723
> URL: https://issues.apache.org/jira/browse/OFBIZ-1723
> Project: OFBiz
> Issue Type: New Feature
> Components: ALL COMPONENTS
> Reporter: Skip Dever
> Priority: Minor
> Attachments: EntityListContainer.ZIP
>
>
> This enhancement provides the java code to allow an application to be written
> that allows the user to click "Next" and "Previous" buttons to cycle through
> a table or view. Included in the download is
> EntityListIteratorContainer.java, and a sample bsh script and .ftl file that
> demonstrate how to use it.
> EntityListIteratorContainer.java creates an instance of EntityListIterator
> that is used to provide the background services in an atomic way, i.e. each
> operation (re)creates an EntityListIterator bounded by begin/commit
> operations and the iterator is closed at the end of each operation.
> To use the class, use one of the EntityListIterator based instantiators and
> then call find(). If find() is not called first, the list is assumed to be
> positioned before the beginning of the table and next() returns the first
> record.
> Calling previous() when at the beginnng of the file returns the last record.
> This code is self contained and the list goes away and is garbage collected
> after 5 minutes of non-use on a timer.
> The bash script accounts for this by recreating the list and doing a find().
> The key to using this is found in the sample ftl file. Which has the tag:
> <input type="hidden" name="listIterator" value="${listIterator}"/>
> The bash script puts the listIterator in the context and a text reference of
> the form
> <url>?listIterator=org.ofbiz.base.util.EntityListIteratorContainer@xxxx is
> passed when the form is submitted.
> This is dereferenced in the subsequent bash script with the lines:
> String containerString = (String)parameters.get("listIterator");
> if(containerString != null)
> container =
> EntityListIteratorContainer.findInstance(containerString);
> This retrieves the previously constructed listIterator and next() and
> previous() operations can be used on it as shown in the sample bash script.
> It all works a charm. I have tested this on a medium sized table with 10000
> entries and the first find() consumes about 80msecs. Subsequent next() and
> previous() calls consume < 20msecs.
> What would make this even better is a way to add a listener on the servlet
> controller so that when the user moved to a different url base, the instance
> could be trashed. But, alas, I can find no such interface.
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