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From Kiran Badi <ki...@poonam.org>
Subject Re: Where do I store Images in tomcat structure so that I can retrive it properly in all browsers
Date Fri, 14 Sep 2012 00:24:29 GMT
On 9/13/2012 8:13 AM, Christopher Schultz wrote:
> Large sites will use a single URL that ends up resolving the images
> from some kind of data source. That data source might be a disk (e.g.
> you could forward to the DefaultServlet) or a database (relational or
> otherwise) where you would write your own servlet to retrieve the data
> yourself.
>
> I would use a servlet that gets the image identifier from the request
> parameters or "path info" and then continues from there. As Konstantin
> points out, using Tomcat's "aliases" feature means that these requests
> may have to perform a linear search through all the aliases to find
> the requested resource. If you write a custom servlet, it will likely
> perform much better than that.
  this is what I am doing it right now and maybe bit different from what 
large sites do.I can see the point and can write filter which will scan 
the request url and point it to respective images directory and then 
serve it.


I store the images in the respective directory, for example for category 
A with subcategory sc, I store in C://A/sc and then write images names 
to the database.

and via jsp

I get this in this format,

img src ="A/test/{Imagename}" with image name coming from the database.

Below is way it looks in requests.

URL    Method    Result    Type    Received    Taken    Initiator 
Wait‎‎    Start‎‎    Request‎‎    Response‎‎    Cache read‎‎ Gap‎‎
/our/UploadedImages/sc/cl1.jpg    GET    200    image/jpeg    40.73 
KB    0.54 s    <img>    219    0    405    141    0    967
/our/UploadedImages/sc/cl2.jpg    GET    200    image/jpeg    45.33 
KB    327 ms    <img>    219    0    249    78    0    1186
/our/UploadedImages/sc/cl3.jpg    GET    200    image/jpeg    26.39 
KB    405 ms    <img>    219    0    140    265    0    1108
/our/UploadedImages/sc/cl4.jpg    GET    200    image/jpeg    40.73 
KB    0.51 s    <img>    219    0    281    234    0    998
/our/UploadedImages/sc/cl5.jpg    GET    200    image/jpeg    23.43 
KB    0.51 s    <img>    219    0    405    110    0

However I am not getting if I am writing the single servlet which 
resolves the images uri, how will it help in improving performance ? If 
Images are in different directories, isn't tomcat needs to scan that 
directory and resolve it ?

Initially I had a single directory,but though it would be nightmare in 
case of maintenance, so thought of refactoring it now.

 >>>>

3. Having 200 aliases means that Tomcat would have to try 200
different prefixes for each resource lookup. Maybe it would not be
noticeable (compared to the other time spent in delivering a
response), but it still seems like a waste of time.

Why should it do resource lookup when I am telling it to look at the exact directory by giving
it the exact name of the file ? In fact while storing also I am
giving it the exact directory path to where it needs to store ?

Do you believe my understanding the way aliases works is incorrect ?


>>>2. It is possible to define a system property (via -D in the options
list at startup, or via catalina.properties file) and reference it as
${propname}.

This approach will require me to refactor my existing code,so I will think of using this in
my next module.There are couple of things I am planning to get it dynamically ,but again somewhat
scared if I can ever write thread safe servlets/classes which can serve multiple concurrent
requests.Currently I have close to 50% of code which is reused.But I need to deal with this
sooner the better else I am going to have war file which will be atleast 40mb in size with
unmanageable number of jsp/servlets/beans.

Thanks Chris and Konstantio for replies.Currently I am on 7.027/7.011 and maybe after some
days, I will upgrade to 7.030 or still better have one more TC for testing purpose.

- Kiran Badi




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