Given that the map will not be displayed to the user, I would continue to pursue the ImageServer approach.
At this point, using the ImageServer, I would look at what the layers are doing.
What kind of layers are you using?
If any of them are custom layers that you wrote, are they all OMGraphicHandlerLayers, or extend from OMGraphicHandlerLayer? If the are, are they launching any other threads in the prepare() method? If not, are you extending the renderDataForProjection(...) method to get serialized behavior?
How are you creating the Projection object for the image request? Are you sure that the scale and location provided to the server are what you are expecting (over data to be displayed)?
- Don
On Jan 20, 2010, at 5:23 PM, John McMahon wrote:
> Thanks, that seems to have helped a little bit, but it's not a consistent
> fix. Once in a while, it still displays an image with only some or no map
> layers being displayed.
>
> To answer your question, no part of the map should be displayed to the user
> while generating this image.
>
> -----Original Message-----
> From: OpenMap Support [mailto:openmap_at_bbn.com]
> Sent: Wednesday, January 20, 2010 1:58 PM
> To: John McMahon
> Cc: openmap-users_at_bbn.com
> Subject: Re: [OpenMap Users] Threading
>
> Hi John,
>
> Is any part of OpenMap visible to the user, are the layers being used to
> display anything?
>
> If you don't have a map display, I would use the ImageServer object to
> create the images for you, it'll use the Layers' renderDataForProjection()
> methods which allows the layers to process the projection and render the
> OMGraphics for that projection in a serialized manner.
>
> Hope this helps,
> Don
>
>
>
> On Jan 20, 2010, at 1:21 PM, John McMahon wrote:
>
>> All,
>>
>> I'm trying to use OpenMap to generate reports that include images from
> maps drawn behind the scenes but not shown to the user. The problem seems
> to be a threading issue:
>>
>> Order things need to happen
>> 1. Layers need to load completely
>> 2. Image needs to be taken from map layers
>> 3. Report needs to be generated using map image
>>
>> Order things are actually happening because of threading
>> 1. Image taken of map layers
>> 2. Layers loading completely
>> 3. Report generated
>>
>> This results in a report that has a blank image ( or the image may only
> include some layers).
>>
>> Is there some way of getting a flag that tells us when the layers are done
> loading/drawing?
>>
>> Thanks,
>> John
>
> =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
> Don Dietrick, dietrick_at_bbn.com
> BBN Technologies, Cambridge MA
> =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
>
>
>
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=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Don Dietrick, dietrick_at_bbn.com
BBN Technologies, Cambridge MA
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
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Received on Wed Jan 20 2010 - 21:06:28 EST