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From "Ronald Thomas (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PIVOT-878) Show FileBrowserSheet while Initializing
Date Wed, 17 Oct 2012 21:28:05 GMT

    [ https://issues.apache.org/jira/browse/PIVOT-878?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13478409#comment-13478409

Ronald Thomas commented on PIVOT-878:

Just repeating that the major delay wasn't within FileBrowserSheet.open() as originally reported.
 The bigger chunk of time is consumed within the FileBrowserSheet() constructor.  Following
the example at: http://pivot.apache.org/tutorials/file-browsing.html (line 37 of the FileBrowsing.java
class), the constructor and open() are both called within the same event handler.  I had originally
made a wrong guess about where the "drive spin-up/reconnect" delay was actually happening.
> Show FileBrowserSheet while Initializing
> ----------------------------------------
>                 Key: PIVOT-878
>                 URL: https://issues.apache.org/jira/browse/PIVOT-878
>             Project: Pivot
>          Issue Type: Improvement
>          Components: wtk-terra
>    Affects Versions: 2.0.2
>         Environment: All (Mostly Windows)
>            Reporter: Ronald Thomas
>            Assignee: Roger Whitcomb
>            Priority: Minor
>              Labels: Browsing, File, FileBrowserSheet, performance, responsiveness, wtk,
>             Fix For: 2.1
>         Attachments: PIVOT-878_example_src.zip, tptp_profiler_exec_call_tree_screenshot.png
> If the list of file roots returned by http://docs.oracle.com/javase/1.4.2/docs/api/java/io/File.html#listRoots()
includes more than a few network drives (primarily on windows where each mapped drive is its
own "file system root"), or if the initial path on the FileBrowserSheet maps to a device that
takes a while to "spin up", the FileBrowserSheet may not appear on the screen for several
seconds making the Pivot app appear unresponsive.  It would help if there were some indication
of activity immediately after the call to the FileBrowserSheet.open() method.  The FileBrowserSheet
could be displayed in a "loading" mode and then switched to its normal display mode once the
potentially long-running initialization has completed.
> In this case, the long running code is around line 936-947 of the 2.0.2 release source
file at wtk-terra\src\org\apache\pivot\wtk\skin\terra\TerraFileBrowserSkin.java
> Steps to reproduce:
> # Create a Pivot application that opens a FileBrowserSheet using a button.
> # Map about 6 network drives or connect external hard drives to drive letters on a machine
running windows
> # Wait enough time for the power-management "spin down" on some or all of the mapped
or connected drives
> # Run the Pivot application and click the button that opens the FileBrowserSheet
> # *Nothing appears to be happening for several seconds* (far too long) while the JVM
collects the results of File.listRoots() to populate the "driveListButton" listData.
> # Finally after several seconds, the FileBrowserSheet appears.

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