Client-side caching of Javascript (for Google Web Toolkit .cache. files

Hi all,
I'm trying out the use of Google Web Toolkit (GWT) for AJAX code development, leveraging RPC calling back-end Web Services for a document browser prototype. When the JavaScript code is generated by GWT, it has the ability to automatically distinguish between cacheable and non-cacheable content via file extensions (.cache. and .nocache.).
Now when running in a Tomcat environment with appropriate caching settings; the application runs extremely fast even on really poor latency sites (>500ms round trip); however on a NetWeaver stack, I can't find any information on how to set an attribute on .cache. files to set an expiry of 1 year.
Anyone know how to do this on a NetWeaver J2EE stack?
Thanks,
Matt
PS. For reference, GWT is a very cool open source project worth watching in the Enterprise space for targeted high-usability, high performance apps. Just the image bundles concept themselves are an awesome approach to minimizing impact of small images on performance.

Hi again,
I thought I should post the solution I came up with in case people search on GWT in the future. In terms of caching, the Portal does a good job of making nearly everything that GWT produces to be cached at the client; and for the life of me, I couldn't get nocache files not cached at the client side.
So thanks to my friendly local SAP experts in the portal space; I discovered there's not much you can do to get this working except try use standard browser tags like the following to prevent caching on the browser:
Note - Can't seem to save this post in SDN with Meta tags that I'm trying to display so check out http://www.willmaster.com/library/tutorials/preventing_content_cache.php for more info...
Unfortunately, the way that GWT creates the nocache files, it is not possible to modify the .js files to do this so I needed an alternative approach.
Then I thought, well, the html file that includes the JS file is cached, but it's not very big, so how about I just write a script to modify the html file when I deploy to production to point to the nocache file with a date suffix.
Let me explain in more detail:
1. The original html file that includes the nocache.js file gets modified to point to nocache.<date>.js.
2. The original nocache.js file gets changed to nocache.<date>.js
3. Now produce an external bat file to do this automatically for you before deployment which DevStudio can call as part of an Ant script or similar.
That's it. So when you are developing, you can manually delete your cache, but just before you go to production, you do this conversion, and you will never have an issue with clients having the wrong version of javascript files.
Note - GWT takes care of caching of most of the files by using a GUID equivalenet each time you compile, so it's just a couple of files that really need to not be cached.
Anyway, I'm not explaining this solution very well, but drop us a line if you need to understand this approach further.
And lastly, my feedback about GWT - It Rocks! Everyone loves the result, it's easy to build and maintain, it offers a great user experience, and it's fast. Not a replacement for transactional apps; but for the occasional user - go for it.
Matt
Edited by: Matt Harding on May 22, 2008 7:48 AM

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Hi,
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Hi Markus. I took a look at that FAST project. There isn't anything like that in BlazeDS currently. It probably wouldn't be too hard to port that code to make it work with Flex 3 but it's usefulness looks somewhat limited. There doesn't look to be any way to timeout a request that has been cached for example which I think most people would want. If you think this is something that would be useful you can log an enhancement request in Jira.
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Where is "Google Web Toolkit Developer Plugin for Firefox?"

I can not find this plug in for the version of Firefox I have 3.6.8, even though it already runs with it?
I can not find Google Web Toolkit Developer Plugin for Firefox for Firefox 3.6.8 even though I already have Google Web Toolkit Developer Plugin for Firefox running on a version of Firefox 3.6.8 on other computers.
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(Edited to correct the formatting to stop the post scrolling to the right - TonyE)

Hi richkatz,
I'm on FF3.6.2 and today, I encounter the same problem.
I got the solution by opening the download page in another tab. Then the firefox message switched from "Look for Plugin" to "Autorise FF to install the plugin".
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Seeya! ;)

Firefox 6 doesn't support Google Web Toolkit add-on so has become useless to me.

Thanks for forcing an upgrade. You need to understand that you will turn people OFF if you force them to upgrade to a platform that is not ready for their full requirements! I can no longer be a Firefox user. Can I go back to my previous version? How?

Looks like the problem is with Google having not released an update yet. See the following link and links within: https://groups.google.com/group/google-web-toolkit/browse_thread/thread/48d34a9fb54af7e6/ddb748430950f08a
Here is a link within that article re: a patch for Firefox 6: https://gwt-code-reviews.appspot.com/1523805/
As Firefox 5.0 and 5.0.1 have unpatched vulnerabilities, I will not provide a link here. Click Inbox at the top right of this forum when you are signed-in to the forum for a message to you.
'''If this reply solves your problem, please click "Solved It" next to this reply when <u>signed-in</u> to the forum.'''

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Below can be used to create people picker in CEWP
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<link rel="Stylesheet" type="text/css" href="../SiteAssets/PeoplePicker/App.css"/>

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Client side cacheing!

Hi,
We have a Java Web Start application, which caches around 500MB of heavy weight objects in memory. These corresponds to different reports and it kind of grows over the time. I am looking for some kind of architecture framework or some work around to maintain this cache at the client side. It is bit late to change the architecture and it is important to cache all the objects.
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Vikram

Cross post:
http://forum.java.sun.com/thread.jspa?threadID=649133
http://forum.java.sun.com/thread.jspa?threadID=649134
http://forum.java.sun.com/thread.jspa?threadID=649135
http://forum.java.sun.com/thread.jspa?threadID=649136
http://forum.java.sun.com/thread.jspa?threadID=649137
http://forum.java.sun.com/thread.jspa?threadID=649138

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At the current stage on my project I'm finding that I'm changing my mapping definitions fairly frequently (because the country side is just the wrong shade of egg-shell). Clearing the server side cache is fairly easy to do, provided you remember to do it, but my problem is on the client side.
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Hi Mark,
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If this does not help, try to set expires header for the images. ex for Apache see mod_expires for a directory/location setting
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==============
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prevent the client from caching the data (isn't it up to the client
to delete the data bits after they're viewed?)
Thanks a bunch for the help.

Let's say I have a FLV that "lives" on a server, and I serve
it up through, say, Ruby. The Ruby script takes care of obtaining
the FLV from the filesystem and renders it to the browser.
Inside my client-side SWF, my code to connect to the Ruby
application and get the FLV may look like this:
var nc:NetConnection = new NetConnection();
nc.connect(null);
var ns:NetStream = new NetStream(nc);
tvid.attachVideo(ns);
ns.setBufferTime(2);
statusID = setInterval(videoStatus, 200);
ns.onStatus = function(info) {
trace(info.code);
if(info.code == "NetStream.Buffer.Full") {
bufferClip._visible = false;
ending = false;
clearInterval( statusID );
statusID = setInterval(videoStatus, 200);
if(info.code == "NetStream.Buffer.Empty") {
if ( !ending ) {
bufferClip._visible = true;
if(info.code == "NetStream.Play.Stop") {
bufferClip._visible = false;
//ending = true;
if(info.code == "NetStream.Play.Start") {
ending = false;
if(info.code == "NetStream.Buffer.Flush") {
ending = true;
//Play it
ns.play("
http://localhost:3000/stream");
==============
It seems to me that the "decision" of whether or not to cache
is entirely dependent on the access method within the client-side
SWF. So, if in this case, I'm using NetStream to stream the video,
will it still be cached on the client end? Or do I -have- to use
FMS to prevent client caching - and if so, why? How does FMS
prevent the client from caching the data (isn't it up to the client
to delete the data bits after they're viewed?)
Thanks a bunch for the help.

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Hi,
I'm using .swf files to extend my CRMOD application, and one of my requirements is to be able to show information on a custom applet using the Client Side Extensions. This information is coming from an external system, so i'm trying to call this external web service using .swf.
When i create my swf application and i run it locally, i can access the web service and receive the results into my browser, but when i do the same call from the custom web applet in CRMOD i don't get any results.
Can someone tell me if this is possible? And if so, how to do it?
Best Regards,
NF

Post Author: luke
CA Forum: Data Integration
Yes. I have figured out the way to do it.
Luke.

How do I force clients to cache files obtained from my servlets

I have a servlet that creates files.
I want to save my servlet from generating a file that a client already has, (ie get him to use caching).
I only want it to create a new file if any data has changed since last making it.
(I can easily generate a last modified date for the data within the file)
I know I have to use
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I have read
http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html
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So I don't need to fill in any HTTP Responce headers,
I can just override the getLastModified() method?Don't take my word for it (because I haven't done it). Read the API documentation to see what it says, or try it.
How will the client beable to compare dates without a
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Options for supporting web toolkit applications

The various changes which have occurred between 10 and 11g are very detrimental to any users developing or supporting applications built with the original web toolkit (not APEX).
In 10g, you could download the database and companion CD and end up with a database and http server with mod_plsql running in no time flat.
In 11g, the database install is just as easy, but the http server install requires "Oracle Fusion Middleware Web Tier" which weighs in at a scary 1Gb+ (for a webserver) and assumes you are wanting to run lots of instances across an "enterprise grid". Even finding the error logs for when it doesn't work is hard. I spent a happy 4 hours trying to install it (following the instructions) without success.
So, you think, what are the alternatives.....
1. You could use the EPG, but the majority of advice is that this isn't suitable for production deployments
2. You could use the APEX listener, but that doesn't support some of the features: flexible parameters, basic auth, etc
There are a number of things Oracle could do to rectify this
1. Open source mod_plsql. If they are not going to develop it further then let someone else do it for them
2. Maintain backwards compatibility with mod_plsql in the APEX listener - not every application is APEX
Hopefully someone from the APEX listener team can say "yes, we'll be making the apex listener compatible with all mod_plsql features in the next release". Fingers crossed...
This was expressed more eloquently by John Flack here
http://it.toolbox.com/blogs/jjflash-oracle-journal/application-express-listener-an-open-letter-35464
Edited by: user486189 on 07-Aug-2010 04:52

Thanks for the favorable mention of my blog - I updated that entry with a later one based on the Release Candidate version of the Apex Listener. I haven't given the production version a really good try yet, but what I've seen is pretty close to what I saw in the early adopter versions, except that the documentation is much better - bravo.
You've named two alternatives to mod_plsql. Here are a few more:
mod_owa: This is similar to mod_plsql, but it works under the generic version of Apache web server, rather than Oracle's customized version, Oracle HTTP Server. It is configured a little differently from mod_plsql and has some variations in the way it supports some of the more advanced features of the PL/SQL Web Toolkit, like flexible parameters. Joe Lennon wrote a blog entry about mod_owa here: http://www.joelennon.ie/2008/12/09/install-apache-mod-owa/.
The base website for mod_owa is: http://oss.oracle.com/projects/mod_owa/dist/documentation/modowa.htm
Thoth Gateway: If you have a Microsoft IIS web server, you might try the Thoth Gateway. Find it here: http://code.google.com/p/thoth-gateway/
DBPrism: This is another JEE based application that I know that some are using. DBPrism was not primarily intended as a mod_plsql replacement, but does do that too. Find it at: http://www.dbprism.com.ar/en/index.html
Please be aware, I haven't tried these (except a brief trial of an earlier version of mod_owa) so I can't vouch for them.

Windows 8.1 Client Side Caching - Is it possible to specify the location of the offline file cache?

Hi,
Is there any approved way to change the location of the offline files cache in Windows 8.1? I'm asking before moving client systems from Windows 7 where a registry change was required - is this still the way to go?
I believe that if the default user-profile directory is moved, this causes problems for updates to Windows 8/8.1 now, is the same true if you move CSC?
Just a bit of background. The systems I want to do this for have smallish SSD boot drives with a higher capacity spinning disk. The machines are members of a domain with Folder Redirection setup. I could setup group policies to disable
caching of some of the larger directories or even disable CSC entirely on the machines which have an SSD boot drive, but would prefer not to do so.
Thanks in advance.

Hi,
According to your descryption, In windows 7, the tool is migwiz.exe, namely the Windows Easy Transfer, you can modify the registry in the way listed in the post below:
http://social.technet.microsoft.com/Forums/en-US/bbf5890c-b3d7-4b38-83d8-d9a5e025fb2b/how-to-move-clientside-caching-to-a-new-location?forum=w7itproinstall
In Windows 8, Windows easy transfer is also a built in tool to migrate user profiles and user settings, but as for the offline transfer, I suggest to use the USMT for your situation.
Because with USMT you can specify the folder that you want to migrate the files to, by using an offline.xml you can set the path just as the sample listed below:
<offline>
     <winDir>
          <path>C:\Windows</path>
          <path>D:\Windows</path>
          <path>E:\</path>
     </winDir>
     <failOnMultipleWinDir>1</failOnMultipleWinDir>
</offline>
You can also refer t othe details at:
http://technet.microsoft.com/en-us/library/hh824880.aspx
Regards
Wade Liu
TechNet Community Support

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