Thanks for the tip, Chuck, but I can't imagine it ever being a
bottleneck for this application or any others that I tend to work on.
mrg
On Thu, Dec 9, 2010 at 3:33 PM, Chuck Kring <cjkr...@pacbell.net> wrote:
> I use onActivate() to return an image for a heartbeat to an Ajax dashboard.
> Using an image allows me to use the onLoad event to verify connectivity.
> When I proposed that, I was warned that using onActivate() to return an
> image can create performance issues. In my case I'm returning a 1-pixel
> GIF so wasn't worried about performance but you might want to be careful
> because you are doing a lot of back end processing.
>
> Chuck
>
> On 12/9/2010 9:37 AM, Michael Gentry wrote:
>>
>> I took a more conventional approach. I created a DatabaseImage page
>> that streams the image from the database.
>>
>> In the TML of the page that wants to embed an image from the database:
>>
>> <img src="${imageLink}"/>
>>
>> In the Java:
>>
>> @Inject
>> private PageRenderLinkSource pageRenderLinkSource;
>>
>> public Link getImageLink()
>> {
>> String encryptedContext = DatabaseImage.encrypt(...);
>> return
>> pageRenderLinkSource.createPageRenderLinkWithContext(DatabaseImage.class,
>> encryptedContext);
>> }
>>
>> The encrypt method basically encrypts everything I need (table names,
>> primary keys, etc) to go find the database image and stuffs it into
>> the link's context. At runtime, I end up with requests from the
>> browser like:
>>
>> GET
>> /MyApp/databaseimage/$002faiNglawZWKGHKrl$002fgpKneotYRwaq9gMk3dPr5zQkW8KkoezyRBm0TutynHstG0$002fyn$002b6izoD$002f$002f9V$000a$002fqAXmUmgxQ$003d$003d
>>
>> Ugly URL, but it works. In the DatabaseImage page itself I have:
>>
>> public StreamResponse onActivate(String context)
>> {
>> ...
>> }
>>
>> that decrypts the encrypted context, finds the image blob stored in
>> the database, and streams it out as the response.
>>
>> mrg
>>
>>
>> On Thu, Dec 9, 2010 at 7:22 AM, Igor Drobiazko<igor.drobia...@gmail.com>
>> wrote:
>>>
>>> There is no documentation for it as this is not an often use case.
>>> However,
>>> just provide you own implementation of AsssetFactory, build it or bind it
>>> in
>>> your module and make the contribution:
>>>
>>> public void contributeAssetSource(MappedConfiguration<String,
>>> AssetFactory> configuration, @InjectService("DbAssetFactory")
>>> AssetFactory
>>> dbAssetFactory) {
>>> configuration.add("db", dbAssetFactory);
>>> }
>>>
>>> Now it is up to you to implement the AssetFactory.
>>>
>>> On Thu, Dec 9, 2010 at 11:53 AM, Gunnar Eketrapp
>>> <gunnar.eketr...@gmail.com>wrote:
>>>
>>>> Hi!
>>>>
>>>> I would like to store uploaded images in the database and then use them
>>>> in
>>>> template files.
>>>>
>>>> Are there any examples of how to do this? I.e. how to define a new
>>>> AssetFactory and contribute it to the AssetSource service configuration.
>>>>
>>>> Thanks in advance,
>>>> Gunnar Eketrapp (from a very cold and snowy Stockholm)
>>>>
>>>> ==================================
>>>> The doc says ...
>>>>
>>>> New Asset Domains
>>>>
>>>> If you wish to create new domains for assets, for example to allow
>>>> assets
>>>> to
>>>> be stored on the file system or in a database, you may define a new
>>>> AssetFactory and contribute it to the AssetSource service configuration.
>>>>
>>>> ===================================
>>>>
>>>
>>>
>>> --
>>> Best regards,
>>>
>>> Igor Drobiazko
>>> http://tapestry5.de
>>>
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