Hi Ron,
I don't understand what you mean by "instead of doing it on
finishLoad()". I did not do anything with finishLoad(), I don't know why
it calls the getList.
Here is my .page file:
<page-specification
class="com.mark_arnold.sample.rbs1.web.tapestry.page.admin.RoomListPage">
<inject property="administrationService"
object="spring:rbsRoomAdminService" />
<inject property="pageService" object="engine-service:page"/>
<inject property="messageResource" object="spring:applicationContext"/>
<property
name="roomList">ognl:administrationService.getAllRooms()</property>
<property name="debug">true</property>
<property name="room"/>
<property name="editPageName"
initial-value="literal:admin/RoomAdminPage"/>
</page-specification>
My Page class extends BasePage, but only overwrites pageAttached()
(nothing related to the list in here).
MARK
Ron Piterman wrote:
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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