Writing my own droplet

Hi,
I am learning how to write my own droplet.
In this droplet I have to take input from user as an integer value and then in output I have to print the values from 1 to that input valuue.
Please help me regarding this.
Regards,
Prateek G

If I want to give a text box where user has to fill the value and then click on a submit button the result will show under that text box.So How can I implement this ?
>
In such type of requirement you can try like below:
[1]. write input.jsp
input.jsp:
<html>
     <head>
          <script src="//ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js">
          </script>
          <script>
               $(document).ready(function(){
                    $("#name").change(function(){
                         var name=$("#name").val();
                         $.ajax({
                              type: "POST",
                              url: "callDroplet.jsp",
                              data: {name: name},
                              success:function(result){
                                   $("#showOutput").html(result);
          </script>
     </head>
     <body>
          <input type="text" id="name">
          <div id="showOutput">callDroplet.jsp's output will come here</div>
     </body>
</html>[2]. Write callDroplet.jsp
<body>
          <dsp:droplet name="/a/b/c/MyXYZDroplet">
               <dsp:param name="input_param" param="name">
               <dsp:oparam name="output">
                    Your output message goes here
               </dsp:oparam>
          </dsp:droplet>
     </body>-RMishra
Edited by: RMishra on May 25, 2013 2:38 PM

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2012-11-22T11:34:55.100773+00:00 localhost postfix/postscreen[20895]: CONNECT from [209.85.214.46]:62210 to [92.243.17.51]:25
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2012-11-22T11:34:55.788961+00:00 localhost spamd[16751]: spamd: setuid to nobody succeeded
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inet_protocols = ipv4
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rewrite unix - - n - - trivial-rewrite
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trace unix - - n - 0 bounce
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proxywrite unix - - n - 1 proxymap
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retry unix - - n - - error
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# ====================================================================
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<action
name="edit"
urlsrc="https://win-owas.cado.camos.de/we/wordeditorframe.aspx?"<ui=UI_LLCC=""&><rs=DC_LLCC=""&><showpagestats=PERFSTATS=""&>"
ext="docx" requires="locks,cobalt,update"/>
I am calling it this way:
<iframe
src="https://win-owas.cado.camos.de/we/wordeditorframe.aspx?WOPISrc=http%3a%2f%2fpc-ms.cado.camos.de%3a8000%2fWOPI%2fapi%2Fwopi%2Ffiles%2FAbout_Keyboard_Input.docx&access_token=5268690b-19c6-496d-8ae6-b694f8e7bd0c"
I’m not sure whether or not I implemented "locks,cobalt,update" correct, but I do not see any ‘edit-’network traffic from OWAS-Server to WOPI-Server. So I cannot debug anything. I will (re)check the articles you mentioned.
Thank you for your help.

ImageIO PNG Writing Slow With Alpha Channel

I'm writing a project that generates images with alpha channels, which I want to save in PNG format. Currently I'm using javax.ImageIO to do this, using statements such as:
ImageIO.write(image, "png", file);
I'm using JDK 1.5.0_06, on Windows XP.
The problem is that writing PNG files is very slow. It can take 9 or 10 seconds to write a 640x512 pixel image, ending up at around 300kb! I have read endless documentation and forum threads today, some of which detail similar problems. This would be an example:
[http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6215304|http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6215304]
This surely must be resolvable, but after much searching I've yet to find a solution. If it makes any difference, I ONLY want to write png image, and ONLY with an alpha channel (not ever without), in case there are optimisations that that makes possible.
If anyone can tell me how to address this problem, I'd be very grateful.
Many thanks, Robert Redwood.

This isn't a solution, but rather a refinement of the issue.
Some of the sources I was reading were implying that the long save time might be due to a CPU heavy conversion process that had to take place before the BufferedImage could be saved. I decided to investigate:
I loaded back in one of the (slowly) saved PNG images using ImageIO.read(file). Sure enough, the BufferedImage returned differed from the BufferedImage I had created. The biggest difference was the color model, which was DirectColorModel on the image I was generating, and was ComponentColorModel on the image I was loading back in.
So I decided to manually convert the image to be the same as how it seemed to end up anyway. I wrote the following code:
      * Takes a BufferedImage object, and if the color model is DirectColorModel,
      * converts it to be a ComponentColorModel suitable for fast PNG writing. If
      * the color model is any other color model than DirectColorModel, a
      * reference to the original image is simply returned.
      * @param source The source image.
      * @return The converted image.
     public static BufferedImage convertColorModelPNG(BufferedImage source)
          if (!(source.getColorModel() instanceof DirectColorModel))
               return source;
          ICC_Profile newProfile = ICC_Profile.getInstance(ColorSpace.CS_sRGB);
          ICC_ColorSpace newSpace = new ICC_ColorSpace(newProfile);
          ComponentColorModel newModel = new ComponentColorModel(newSpace, true, false, ComponentColorModel.TRANSLUCENT, DataBuffer.TYPE_BYTE);
          PixelInterleavedSampleModel newSampleModel = new PixelInterleavedSampleModel(DataBuffer.TYPE_BYTE, source.getWidth(), source.getHeight(), 4, source.getWidth() * 4, new int[] { 0, 1, 2, 3 });
          DataBufferByte newDataBuffer = new DataBufferByte(source.getWidth() * source.getHeight() * 4);
          ByteInterleavedRaster newRaster = new ByteInterleavedRaster(newSampleModel, newDataBuffer, new Point(0, 0));
          BufferedImage dest = new BufferedImage(newModel, newRaster, false, new Hashtable());
          int[] srcData = ((DataBufferInt)source.getRaster().getDataBuffer()).getData();
          byte[] destData = newDataBuffer.getData();
          int j = 0;
          byte argb = 0;
          for (int i = 0; i < srcData.length; i++)
               j = i * 4;
               argb = (byte)(srcData[i] >> 24);
               destData[j] = argb;
               destData[j + 1] = 0;
               destData[j + 2] = 0;
               destData[j + 3] = 0;
          //Graphics2D g2 = dest.createGraphics();
          //g2.drawImage(source, 0, 0, null);
          //g2.dispose();
          return dest;
     }My apologies if that doesn't display correctly in the post.
Basically, I create a BufferedImage the hard way, matching all the parameters of the image I get when I load in a PNG with alpha channel.
The last bit, (for simplicity), just makes sure I copy over the alpha channel of old image to the new image, and assumes the color was black. This doesn't make any real speed difference.
Now that runs lightning quick, but interestingly, see the bit I've commented out? The alternative to setting the ARGB values was to just draw the old image onto the new image. For a 640x512 image, this command (drawImage) took a whopping 36 SECONDS to complete! This may hint that the problem is to do with conversion.
Anyhow, I got rather excited. The conversion went quickly. Here's the rub though, the image took 9 seconds to save using ImageIO.write, just the same as if I had never converted it. :(
SOOOOOOOOOOOO... Why have I told you all this?
Well, I guess I think it narrows dow the problem, but eliminates some solutions (to save people suggesting them).
Bottom line, I still need to know why saving PNGs using ImageIO is so slow. Is there any other way to fix this, short of writing my own PNG writer, and indeed would THAT fix the issue?
For the record, I have a piece of C code that does this in well under a second, so it can't JUST be a case of 'too much number-crunching'.
I really would appreciate any help you can give on this. It's very frustrating.
Thanks again. Robert Redwood.

Installing own kernel...

I have no problem git cloning my kernel of choice and configuring. My question is when compiling a new video drivers or any other package that might be dependent on Linux sources. I usually use the /usr/src directory. I am having trouble with the PKGBUILD on kernel26zen-git. It fails at installing after compile.
Is there a global symlink ?Like there is in Gentoo? Where, I can custom build my kernels, and not have to worry about when I install new Nvidia drivers from there website. I am just greatly disappointed in these custom PKGBUILDS, and I don't need a initrd package. Are there any special parameters I need to be aware of... such as any global symlinks?
Am I going to have problems install drivers from Nvidia's site if I decide not use the kernel26 packages, or any other package that compiles against the kernel sources..?
Here's the error I get from the PKGBUILD
==> ERROR: Failed... Your source tree might be broken. Run 'make mrproper' in src/kernel26zen to clean it up
==> ERROR: Build Failed.
Aborting...
Error: Makepkg was unable to build kernel26zen package
Last edited by StanIsTheMan (2009-09-26 20:36:48)

B wrote:
The PKGBUILD seems to be pointing to his own kernel chanco, shouldn't be a problem.
@ OP: did you try the suggestion the error is giving you? I.e. a
make mproper
in the source tree?
I was going to ... but I decided on a static kernel. And since I used to write ebuilds for my own packages, I decided to take up the task of writing my own PKGBUILD /w a static kernel, using the zen-sources git tree.
BTW, am I going to be running into any problems in the future when running updates through pacman /w the way my kernel is setup? That's ,my main concern, since I am using a static kernel. Though I do use my own video drivers from the Nvidia site, so I am not worried about video drivers.
I guess I became accustomed with gentoo, that so much of the transition has been different. Though I like Arch and its ABS, and AUR, plus there are lot of packages available.
Last edited by StanIsTheMan (2009-09-27 23:03:52)

Writing my own droplet

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