use lazy initialization for the list instead of doing it on finishLoad() :
public List getXXXList() {
if (this.xxxList == null )
this.xxxList = readXXXList();
return this.xxxList;
}
+
pageDetachListener -> this.xxxList = null.
Cheers,
Ron
Mark wrote:
Hi,
I have a simple CRUD scenario with a "ListPage" and a "ModifyPage".
The ListPage gets all records from the DB by calling the method
"getAllRooms()" of a "RoomAdminService" and lists them in a table.
For some reason the query "select * from rooms" is executed twice every
time the page is accessed.
getAllRooms() is only referenced once in the .page file to plug a page
property, the .html file then references that property
I compared the StackTraces of the two calls, they have identical tops
and bottoms, but differ somwhere in the middle:
at $RoomListPage_3.finishLoad($RoomListPage_3.java)
at
org.apache.tapestry.pageload.PageLoader.constructComponent(PageLoader.java:439)
at
org.apache.tapestry.pageload.PageLoader.loadPage(PageLoader.java:613)
at $IPageLoader_10b79e6e7bf.loadPage($IPageLoader_10b79e6e7bf.java)
at $IPageLoader_10b79e6e7c0.loadPage($IPageLoader_10b79e6e7c0.java)
at
org.apache.tapestry.pageload.PageSource.getPage(PageSource.java:120)
at $IPageSource_10b79e6e724.getPage($IPageSource_10b79e6e724.java)
at
org.apache.tapestry.engine.RequestCycle.loadPage(RequestCycle.java:268)
at
org.apache.tapestry.engine.RequestCycle.getPage(RequestCycle.java:251)
at
org.apache.tapestry.engine.RequestCycle.activate(RequestCycle.java:609)
at
org.apache.tapestry.engine.PageService.service(PageService.java:66)
at
$IEngineService_10b79e6e7af.service($IEngineService_10b79e6e7af.java)
at
org.apache.tapestry.services.impl.EngineServiceOuterProxy.service(EngineServiceOuterProxy.java:66)
and
at $RoomListPage_3.pageDetached($RoomListPage_3.java)
at
org.apache.tapestry.AbstractPage.firePageDetached(AbstractPage.java:452)
at org.apache.tapestry.AbstractPage.detach(AbstractPage.java:140)
at
org.apache.tapestry.pageload.PageSource.releasePage(PageSource.java:147)
at
$IPageSource_10b79e6e724.releasePage($IPageSource_10b79e6e724.java)
at
org.apache.tapestry.engine.RequestCycle.cleanup(RequestCycle.java:192)
So it seems like the first call comes out of the finishLoad(), while the
second call is caused by pageDetached() of my ListPage.
Does anybody know why it would access the getAllRooms() twice?
Thanks,
MARK
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