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Posted to users@tomcat.apache.org by Yair Ben-Meir <ya...@sundaysky.com> on 2007/11/22 13:57:32 UTC
multithreaded with taglibs
Hi
Is there a way to write a taglib that will do a multithreading work?
Meaning, that tomcat will not wait till the first instance of the tag will
end, and continue to the rest of the page, and maybe start with another
instance, and than it will insert the result of each instance in the right
place?
Example:
<my:img name=""/>
.
<my:img name=""/>
And let say that each my:img is supposed to download the image and save it
locally or something like that, and I don't want tomcat to wait till the
first tag is finished.
Thanks
Yair Ben-Meir
Office: 073-7997801
Fax: 073-7997800
Mob: 054-5769681
RE: multithreaded with taglibs
Posted by Yair Ben-Meir <ya...@sundaysky.com>.
Well, the output of the jsp isn't html in my case, but something similar, an
xml file with references to other files.
-----Original Message-----
From: Pid [mailto:p@pidster.com]
Sent: Monday, November 26, 2007 1:48 PM
To: Tomcat Users List
Subject: Re: multithreaded with taglibs
ben's method does actually produce a static file I think, he's just
producing them on demand and delivering them via a servlet.
I'm curious, why does it have to be a static file, and why does it have
to be a local 'file:' based url?
p
Yair Ben-Meir wrote:
> Hi ben
> Thanks for your idea. In my case, I can't use it, since the generated img
> tag must be a static file (a file: url) and not a link to a servlet.
That's
> why the processing must be when generating the html.
> Thanks
> Yair
>
>
> -----Original Message-----
> From: ben short [mailto:jamin.short@gmail.com]
> Sent: Monday, November 26, 2007 1:19 PM
> To: Tomcat Users List
> Subject: Re: multithreaded with taglibs
>
> Yair,
>
> I created a eshop website that dynamically re sizes images depending
> on the url. Here is a simple outline of what happens.
>
> A new product is created by the shop admin. Images are then uploaded
> and stored in a database in the uploaded size.
>
> When a product page is viewed the controller ( im using spring ) pulls
> the product object from the db and passes it to the view, a jsp page.
>
> The jsp then generates a image tag as show below.
>
> <img width="175px" name="mainImage"
> src="productimages/69_s_medium.jpg" title="Kitchen Stove and
> Utensils"/>
>
> The browser then renders the page, when it finds a image tag it then
> uses another thread to load the image. this is standard browser
> behavior.
>
> The productimages url is mapped to another controller, that parses the
> url. The first part of the url is the image id, the next part is tells
> it that the part after that is a size rather than a dimension. The
> controller knows the expected dimensions for a medium image.
>
> The controller then pulls the image from the db and resizes it before
> sending it to the browser. The controller is actually smarter than
> that, and does on disk caching of resized images and check the last
> mod time, but i wont detail that here.
>
> So what is happening here is the browser is rendering the html created
> by the jsp page and then making another request to get the images,
> which is then making tomcat use another thread to generate the image.
> Sound like what your trying to achieve?
>
> Ben
>
> On Nov 26, 2007 10:15 AM, David Cassidy <da...@twocats.co.uk> wrote:
>> Errr
>>
>> how will you allow people to access the file over the internet with a
>> file:// protocol ?
>>
>> are you only running the app and the users browser on the same machine ?
>>
>> file://C:\My Documents\image.gif
>>
>> ?
>>
>> Can't see that working over the internet....
>>
>>
>>
>> On Sun, 2007-11-25 at 13:56 +0200, Yair Ben-Meir wrote:
>>> Thanks, but that's not good for me, I need the page to be with a real
> file
>>> link (file://), not through a servlet.
>>>
>>>
>>> -----Original Message-----
>>> From: Pid [mailto:p@pidster.com]
>>> Sent: Sunday, November 25, 2007 11:53 AM
>>> To: Tomcat Users List
>>> Subject: Re: multithreaded with taglibs
>>>
>>> Yair Ben-Meir wrote:
>>>> Let say that the tag will have to generate the image with a text given
> as
>>> an
>>>> attribute, and it takes "time" so I want the page to continue:
>>>>
>>>> <my:img src="file" text="first"/>
>>>>
>>>> .
>>>>
>>>> <my:img src="file" text="first"/>
>>> Why are you doing this with a tag, rather than sending the parameter to
>>> a servlet that serves an image into it's output stream?
>>>
>>> You exploit the browsers own request handling capabilities this way.
>>>
>>> <img src="/img-app/generate?param1=some+text+here" alt="an image" />
>>>
>>>
>>> p
>>>
>>>
>>>
>>>> -----Original Message-----
>>>> From: David Cassidy [mailto:david@twocats.co.uk]
>>>> Sent: Thursday, November 22, 2007 6:08 PM
>>>> To: Tomcat Users List
>>>> Subject: Re: multithreaded with taglibs
>>>>
>>>> Hi
>>>>
>>>> What is your tag going to produce ?
>>>> is it an <IMG SRC="....."> type tag ?
>>>>
>>>> or how are you allowing the browser to access the image ?
>>>>
>>>> Ta
>>>>
>>>> D
>>>>
>>>> On Thu, 2007-11-22 at 14:57 +0200, Yair Ben-Meir wrote:
>>>>> Hi
>>>>>
>>>>> Is there a way to write a taglib that will do a multithreading work?
>>>>> Meaning, that tomcatwill not wait till the first instance of the tag
>>>>> will end, and continue to the rest of the page, and maybe start with
>>>>> another instance, and than it will insert the result of each instance
>>>>> in the right place?
>>>>>
>>>>>
>>>>>
>>>>> Example:
>>>>>
>>>>> <my:img name=""/>
>>>>>
>>>>> .
>>>>>
>>>>> <my:img name=""/>
>>>>>
>>>>>
>>>>>
>>>>> And let say that each my:img is supposed to download the image and
>>>>> save it locally or something like that, and I don't want tomcat to
>>>>> wait till the first tag is finished.
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> Thanks
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> Yair Ben-Meir
>>>>>
>>>>>
>>>>>
>>>>> Office: 073-7997801
>>>>>
>>>>> Fax: 073-7997800
>>>>>
>>>>> Mob: 054-5769681
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>
>>>> ---------------------------------------------------------------------
>>>> To start a new topic, e-mail: users@tomcat.apache.org
>>>> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
>>>> For additional commands, e-mail: users-help@tomcat.apache.org
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> ---------------------------------------------------------------------
>>>> To start a new topic, e-mail: users@tomcat.apache.org
>>>> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
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>>>>
>>>>
>>>
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>>>
>>>
>>>
>>>
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>>
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>>
>
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>
>
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Re: multithreaded with taglibs
Posted by Pid <p...@pidster.com>.
ben's method does actually produce a static file I think, he's just
producing them on demand and delivering them via a servlet.
I'm curious, why does it have to be a static file, and why does it have
to be a local 'file:' based url?
p
Yair Ben-Meir wrote:
> Hi ben
> Thanks for your idea. In my case, I can't use it, since the generated img
> tag must be a static file (a file: url) and not a link to a servlet. That's
> why the processing must be when generating the html.
> Thanks
> Yair
>
>
> -----Original Message-----
> From: ben short [mailto:jamin.short@gmail.com]
> Sent: Monday, November 26, 2007 1:19 PM
> To: Tomcat Users List
> Subject: Re: multithreaded with taglibs
>
> Yair,
>
> I created a eshop website that dynamically re sizes images depending
> on the url. Here is a simple outline of what happens.
>
> A new product is created by the shop admin. Images are then uploaded
> and stored in a database in the uploaded size.
>
> When a product page is viewed the controller ( im using spring ) pulls
> the product object from the db and passes it to the view, a jsp page.
>
> The jsp then generates a image tag as show below.
>
> <img width="175px" name="mainImage"
> src="productimages/69_s_medium.jpg" title="Kitchen Stove and
> Utensils"/>
>
> The browser then renders the page, when it finds a image tag it then
> uses another thread to load the image. this is standard browser
> behavior.
>
> The productimages url is mapped to another controller, that parses the
> url. The first part of the url is the image id, the next part is tells
> it that the part after that is a size rather than a dimension. The
> controller knows the expected dimensions for a medium image.
>
> The controller then pulls the image from the db and resizes it before
> sending it to the browser. The controller is actually smarter than
> that, and does on disk caching of resized images and check the last
> mod time, but i wont detail that here.
>
> So what is happening here is the browser is rendering the html created
> by the jsp page and then making another request to get the images,
> which is then making tomcat use another thread to generate the image.
> Sound like what your trying to achieve?
>
> Ben
>
> On Nov 26, 2007 10:15 AM, David Cassidy <da...@twocats.co.uk> wrote:
>> Errr
>>
>> how will you allow people to access the file over the internet with a
>> file:// protocol ?
>>
>> are you only running the app and the users browser on the same machine ?
>>
>> file://C:\My Documents\image.gif
>>
>> ?
>>
>> Can't see that working over the internet....
>>
>>
>>
>> On Sun, 2007-11-25 at 13:56 +0200, Yair Ben-Meir wrote:
>>> Thanks, but that's not good for me, I need the page to be with a real
> file
>>> link (file://), not through a servlet.
>>>
>>>
>>> -----Original Message-----
>>> From: Pid [mailto:p@pidster.com]
>>> Sent: Sunday, November 25, 2007 11:53 AM
>>> To: Tomcat Users List
>>> Subject: Re: multithreaded with taglibs
>>>
>>> Yair Ben-Meir wrote:
>>>> Let say that the tag will have to generate the image with a text given
> as
>>> an
>>>> attribute, and it takes "time" so I want the page to continue:
>>>>
>>>> <my:img src="file" text="first"/>
>>>>
>>>> .
>>>>
>>>> <my:img src="file" text="first"/>
>>> Why are you doing this with a tag, rather than sending the parameter to
>>> a servlet that serves an image into it's output stream?
>>>
>>> You exploit the browsers own request handling capabilities this way.
>>>
>>> <img src="/img-app/generate?param1=some+text+here" alt="an image" />
>>>
>>>
>>> p
>>>
>>>
>>>
>>>> -----Original Message-----
>>>> From: David Cassidy [mailto:david@twocats.co.uk]
>>>> Sent: Thursday, November 22, 2007 6:08 PM
>>>> To: Tomcat Users List
>>>> Subject: Re: multithreaded with taglibs
>>>>
>>>> Hi
>>>>
>>>> What is your tag going to produce ?
>>>> is it an <IMG SRC="....."> type tag ?
>>>>
>>>> or how are you allowing the browser to access the image ?
>>>>
>>>> Ta
>>>>
>>>> D
>>>>
>>>> On Thu, 2007-11-22 at 14:57 +0200, Yair Ben-Meir wrote:
>>>>> Hi
>>>>>
>>>>> Is there a way to write a taglib that will do a multithreading work?
>>>>> Meaning, that tomcatwill not wait till the first instance of the tag
>>>>> will end, and continue to the rest of the page, and maybe start with
>>>>> another instance, and than it will insert the result of each instance
>>>>> in the right place?
>>>>>
>>>>>
>>>>>
>>>>> Example:
>>>>>
>>>>> <my:img name=""/>
>>>>>
>>>>> .
>>>>>
>>>>> <my:img name=""/>
>>>>>
>>>>>
>>>>>
>>>>> And let say that each my:img is supposed to download the image and
>>>>> save it locally or something like that, and I don't want tomcat to
>>>>> wait till the first tag is finished.
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> Thanks
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> Yair Ben-Meir
>>>>>
>>>>>
>>>>>
>>>>> Office: 073-7997801
>>>>>
>>>>> Fax: 073-7997800
>>>>>
>>>>> Mob: 054-5769681
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>
>>>> ---------------------------------------------------------------------
>>>> To start a new topic, e-mail: users@tomcat.apache.org
>>>> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
>>>> For additional commands, e-mail: users-help@tomcat.apache.org
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> ---------------------------------------------------------------------
>>>> To start a new topic, e-mail: users@tomcat.apache.org
>>>> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
>>>> For additional commands, e-mail: users-help@tomcat.apache.org
>>>>
>>>>
>>>
>>> ---------------------------------------------------------------------
>>> To start a new topic, e-mail: users@tomcat.apache.org
>>> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
>>> For additional commands, e-mail: users-help@tomcat.apache.org
>>>
>>>
>>>
>>>
>>>
>>> ---------------------------------------------------------------------
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>>> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
>>> For additional commands, e-mail: users-help@tomcat.apache.org
>>>
>>
>> ---------------------------------------------------------------------
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>> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
>> For additional commands, e-mail: users-help@tomcat.apache.org
>>
>>
>
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>
>
>
>
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RE: multithreaded with taglibs
Posted by Yair Ben-Meir <ya...@sundaysky.com>.
Hi ben
Thanks for your idea. In my case, I can't use it, since the generated img
tag must be a static file (a file: url) and not a link to a servlet. That's
why the processing must be when generating the html.
Thanks
Yair
-----Original Message-----
From: ben short [mailto:jamin.short@gmail.com]
Sent: Monday, November 26, 2007 1:19 PM
To: Tomcat Users List
Subject: Re: multithreaded with taglibs
Yair,
I created a eshop website that dynamically re sizes images depending
on the url. Here is a simple outline of what happens.
A new product is created by the shop admin. Images are then uploaded
and stored in a database in the uploaded size.
When a product page is viewed the controller ( im using spring ) pulls
the product object from the db and passes it to the view, a jsp page.
The jsp then generates a image tag as show below.
<img width="175px" name="mainImage"
src="productimages/69_s_medium.jpg" title="Kitchen Stove and
Utensils"/>
The browser then renders the page, when it finds a image tag it then
uses another thread to load the image. this is standard browser
behavior.
The productimages url is mapped to another controller, that parses the
url. The first part of the url is the image id, the next part is tells
it that the part after that is a size rather than a dimension. The
controller knows the expected dimensions for a medium image.
The controller then pulls the image from the db and resizes it before
sending it to the browser. The controller is actually smarter than
that, and does on disk caching of resized images and check the last
mod time, but i wont detail that here.
So what is happening here is the browser is rendering the html created
by the jsp page and then making another request to get the images,
which is then making tomcat use another thread to generate the image.
Sound like what your trying to achieve?
Ben
On Nov 26, 2007 10:15 AM, David Cassidy <da...@twocats.co.uk> wrote:
> Errr
>
> how will you allow people to access the file over the internet with a
> file:// protocol ?
>
> are you only running the app and the users browser on the same machine ?
>
> file://C:\My Documents\image.gif
>
> ?
>
> Can't see that working over the internet....
>
>
>
> On Sun, 2007-11-25 at 13:56 +0200, Yair Ben-Meir wrote:
> > Thanks, but that's not good for me, I need the page to be with a real
file
> > link (file://), not through a servlet.
> >
> >
> > -----Original Message-----
> > From: Pid [mailto:p@pidster.com]
> > Sent: Sunday, November 25, 2007 11:53 AM
> > To: Tomcat Users List
> > Subject: Re: multithreaded with taglibs
> >
> > Yair Ben-Meir wrote:
> > > Let say that the tag will have to generate the image with a text given
as
> > an
> > > attribute, and it takes "time" so I want the page to continue:
> > >
> > > <my:img src="file" text="first"/>
> > >
> > > .
> > >
> > > <my:img src="file" text="first"/>
> >
> > Why are you doing this with a tag, rather than sending the parameter to
> > a servlet that serves an image into it's output stream?
> >
> > You exploit the browsers own request handling capabilities this way.
> >
> > <img src="/img-app/generate?param1=some+text+here" alt="an image" />
> >
> >
> > p
> >
> >
> >
> > > -----Original Message-----
> > > From: David Cassidy [mailto:david@twocats.co.uk]
> > > Sent: Thursday, November 22, 2007 6:08 PM
> > > To: Tomcat Users List
> > > Subject: Re: multithreaded with taglibs
> > >
> > > Hi
> > >
> > > What is your tag going to produce ?
> > > is it an <IMG SRC="....."> type tag ?
> > >
> > > or how are you allowing the browser to access the image ?
> > >
> > > Ta
> > >
> > > D
> > >
> > > On Thu, 2007-11-22 at 14:57 +0200, Yair Ben-Meir wrote:
> > >> Hi
> > >>
> > >> Is there a way to write a taglib that will do a multithreading work?
> > >> Meaning, that tomcatwill not wait till the first instance of the tag
> > >> will end, and continue to the rest of the page, and maybe start with
> > >> another instance, and than it will insert the result of each instance
> > >> in the right place?
> > >>
> > >>
> > >>
> > >> Example:
> > >>
> > >> <my:img name=""/>
> > >>
> > >> .
> > >>
> > >> <my:img name=""/>
> > >>
> > >>
> > >>
> > >> And let say that each my:img is supposed to download the image and
> > >> save it locally or something like that, and I don't want tomcat to
> > >> wait till the first tag is finished.
> > >>
> > >>
> > >>
> > >>
> > >>
> > >> Thanks
> > >>
> > >>
> > >>
> > >>
> > >>
> > >> Yair Ben-Meir
> > >>
> > >>
> > >>
> > >> Office: 073-7997801
> > >>
> > >> Fax: 073-7997800
> > >>
> > >> Mob: 054-5769681
> > >>
> > >>
> > >>
> > >>
> > >>
> > >>
> > >
> > >
> > > ---------------------------------------------------------------------
> > > To start a new topic, e-mail: users@tomcat.apache.org
> > > To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> > > For additional commands, e-mail: users-help@tomcat.apache.org
> > >
> > >
> > >
> > >
> > >
> > > ---------------------------------------------------------------------
> > > To start a new topic, e-mail: users@tomcat.apache.org
> > > To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> > > For additional commands, e-mail: users-help@tomcat.apache.org
> > >
> > >
> >
> >
> > ---------------------------------------------------------------------
> > To start a new topic, e-mail: users@tomcat.apache.org
> > To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> > For additional commands, e-mail: users-help@tomcat.apache.org
> >
> >
> >
> >
> >
> > ---------------------------------------------------------------------
> > To start a new topic, e-mail: users@tomcat.apache.org
> > To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> > For additional commands, e-mail: users-help@tomcat.apache.org
> >
>
>
> ---------------------------------------------------------------------
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>
>
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Re: multithreaded with taglibs
Posted by ben short <ja...@gmail.com>.
Yair,
I created a eshop website that dynamically re sizes images depending
on the url. Here is a simple outline of what happens.
A new product is created by the shop admin. Images are then uploaded
and stored in a database in the uploaded size.
When a product page is viewed the controller ( im using spring ) pulls
the product object from the db and passes it to the view, a jsp page.
The jsp then generates a image tag as show below.
<img width="175px" name="mainImage"
src="productimages/69_s_medium.jpg" title="Kitchen Stove and
Utensils"/>
The browser then renders the page, when it finds a image tag it then
uses another thread to load the image. this is standard browser
behavior.
The productimages url is mapped to another controller, that parses the
url. The first part of the url is the image id, the next part is tells
it that the part after that is a size rather than a dimension. The
controller knows the expected dimensions for a medium image.
The controller then pulls the image from the db and resizes it before
sending it to the browser. The controller is actually smarter than
that, and does on disk caching of resized images and check the last
mod time, but i wont detail that here.
So what is happening here is the browser is rendering the html created
by the jsp page and then making another request to get the images,
which is then making tomcat use another thread to generate the image.
Sound like what your trying to achieve?
Ben
On Nov 26, 2007 10:15 AM, David Cassidy <da...@twocats.co.uk> wrote:
> Errr
>
> how will you allow people to access the file over the internet with a
> file:// protocol ?
>
> are you only running the app and the users browser on the same machine ?
>
> file://C:\My Documents\image.gif
>
> ?
>
> Can't see that working over the internet....
>
>
>
> On Sun, 2007-11-25 at 13:56 +0200, Yair Ben-Meir wrote:
> > Thanks, but that's not good for me, I need the page to be with a real file
> > link (file://), not through a servlet.
> >
> >
> > -----Original Message-----
> > From: Pid [mailto:p@pidster.com]
> > Sent: Sunday, November 25, 2007 11:53 AM
> > To: Tomcat Users List
> > Subject: Re: multithreaded with taglibs
> >
> > Yair Ben-Meir wrote:
> > > Let say that the tag will have to generate the image with a text given as
> > an
> > > attribute, and it takes "time" so I want the page to continue:
> > >
> > > <my:img src="file" text="first"/>
> > >
> > > .
> > >
> > > <my:img src="file" text="first"/>
> >
> > Why are you doing this with a tag, rather than sending the parameter to
> > a servlet that serves an image into it's output stream?
> >
> > You exploit the browsers own request handling capabilities this way.
> >
> > <img src="/img-app/generate?param1=some+text+here" alt="an image" />
> >
> >
> > p
> >
> >
> >
> > > -----Original Message-----
> > > From: David Cassidy [mailto:david@twocats.co.uk]
> > > Sent: Thursday, November 22, 2007 6:08 PM
> > > To: Tomcat Users List
> > > Subject: Re: multithreaded with taglibs
> > >
> > > Hi
> > >
> > > What is your tag going to produce ?
> > > is it an <IMG SRC="....."> type tag ?
> > >
> > > or how are you allowing the browser to access the image ?
> > >
> > > Ta
> > >
> > > D
> > >
> > > On Thu, 2007-11-22 at 14:57 +0200, Yair Ben-Meir wrote:
> > >> Hi
> > >>
> > >> Is there a way to write a taglib that will do a multithreading work?
> > >> Meaning, that tomcatwill not wait till the first instance of the tag
> > >> will end, and continue to the rest of the page, and maybe start with
> > >> another instance, and than it will insert the result of each instance
> > >> in the right place?
> > >>
> > >>
> > >>
> > >> Example:
> > >>
> > >> <my:img name=""/>
> > >>
> > >> .
> > >>
> > >> <my:img name=""/>
> > >>
> > >>
> > >>
> > >> And let say that each my:img is supposed to download the image and
> > >> save it locally or something like that, and I don't want tomcat to
> > >> wait till the first tag is finished.
> > >>
> > >>
> > >>
> > >>
> > >>
> > >> Thanks
> > >>
> > >>
> > >>
> > >>
> > >>
> > >> Yair Ben-Meir
> > >>
> > >>
> > >>
> > >> Office: 073-7997801
> > >>
> > >> Fax: 073-7997800
> > >>
> > >> Mob: 054-5769681
> > >>
> > >>
> > >>
> > >>
> > >>
> > >>
> > >
> > >
> > > ---------------------------------------------------------------------
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> >
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> >
> >
> >
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Re: multithreaded with taglibs
Posted by ben short <ja...@gmail.com>.
Do you really need to use tomcat to do this? Maybe you should take a
step back and rethink what your trying to achieve.
On Nov 29, 2007 10:14 AM, Yair Ben-Meir <ya...@sundaysky.com> wrote:
> Let me try another scenario: let say that the generated text for the "out"
> is not one iamge, but some number between 0 and 5. the correct number of
> images will be clear only after the execution of the thread. In this case, I
> do want to continue with the JSP and write to the "out" later on.
> The only think I thought of was to write something like "{1}" (instead of
> tag) and when the page is over it will replace "{1}" with the right code
> from the thread. This will require me to get the generated page from the JSP
> and manipulate it after Jasper has finished with it.
> Any better way to do it?
>
> -----Original Message-----
> From: Christopher Schultz [mailto:chris@christopherschultz.net]
> Sent: Wednesday, November 28, 2007 7:04 PM
> To: Tomcat Users List
> Subject: Re: multithreaded with taglibs
>
>
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> Yair,
>
> Yair Ben-Meir wrote:
> > This solution is good but we must write to the out of the jsp before the
> > thread is running (we bypass this because the thread will write to a
> > pre-decided file name). is there another way to do it, without writing to
> > the out?
>
> I'm not sure I understand what you mean. Are you asking how to continue
> evaluating the JSP while the image is being generated? Easy. Create a
> class like this:
>
> public class ParallelImageGenerator
> {
> public ParallelImageGenerator() { ... }
>
> public String getGeneratedFilename() { ... }
>
> public void start() { ... }
> public void wait() { ... }
> }
>
> Then, from your tagStart method in your custom tag library, do something
> like this:
>
> pig = new ParallelImageGenerator();
> pig.start();
>
> jspOut.print("<img src=\"" + pig.getGeneratedFilename() + "\" />");
>
> // Register the 'pig' object somewhere so you can go back and "wait"
> // on all of the image generators.
>
> - -chris
>
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>
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Re: multithreaded with taglibs
Posted by Christopher Schultz <ch...@christopherschultz.net>.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
Yair,
Yair Ben-Meir wrote:
> Let me try another scenario: let say that the generated text for the "out"
> is not one iamge, but some number between 0 and 5. the correct number of
> images will be clear only after the execution of the thread. In this case, I
> do want to continue with the JSP and write to the "out" later on.
> The only think I thought of was to write something like "{1}" (instead of
> tag) and when the page is over it will replace "{1}" with the right code
> from the thread. This will require me to get the generated page from the JSP
> and manipulate it after Jasper has finished with it.
This will require you to write a "body" tag (or whatever they're
called). I haven't written a tag library in 7 years. :(
Basically, you'll have to keep all the template content somewhere so you
can manipulate it /after/ the threads are done, but before the output is
written. Using a wrapper tag (like <parallel><img><img><img></parallel>)
will help here because you can collect all the jobs to be done (each img
is a job), run them all in parallel, wait for them all to finish, and
then generate all the relevant (real) content to the output stream.
Another option is to simply do all this work before you start generating
any output, which would be my preference. Have the request invoke a
servlet that does everything and then writes the output using JSP. Much
easier and cleaner, which is why it's been the recommended technique
since two days after JSP was invented.
- -chris
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RE: multithreaded with taglibs
Posted by Yair Ben-Meir <ya...@sundaysky.com>.
Let me try another scenario: let say that the generated text for the "out"
is not one iamge, but some number between 0 and 5. the correct number of
images will be clear only after the execution of the thread. In this case, I
do want to continue with the JSP and write to the "out" later on.
The only think I thought of was to write something like "{1}" (instead of
tag) and when the page is over it will replace "{1}" with the right code
from the thread. This will require me to get the generated page from the JSP
and manipulate it after Jasper has finished with it.
Any better way to do it?
-----Original Message-----
From: Christopher Schultz [mailto:chris@christopherschultz.net]
Sent: Wednesday, November 28, 2007 7:04 PM
To: Tomcat Users List
Subject: Re: multithreaded with taglibs
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
Yair,
Yair Ben-Meir wrote:
> This solution is good but we must write to the out of the jsp before the
> thread is running (we bypass this because the thread will write to a
> pre-decided file name). is there another way to do it, without writing to
> the out?
I'm not sure I understand what you mean. Are you asking how to continue
evaluating the JSP while the image is being generated? Easy. Create a
class like this:
public class ParallelImageGenerator
{
public ParallelImageGenerator() { ... }
public String getGeneratedFilename() { ... }
public void start() { ... }
public void wait() { ... }
}
Then, from your tagStart method in your custom tag library, do something
like this:
pig = new ParallelImageGenerator();
pig.start();
jspOut.print("<img src=\"" + pig.getGeneratedFilename() + "\" />");
// Register the 'pig' object somewhere so you can go back and "wait"
// on all of the image generators.
- -chris
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Re: multithreaded with taglibs
Posted by Christopher Schultz <ch...@christopherschultz.net>.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
Yair,
Yair Ben-Meir wrote:
> This solution is good but we must write to the out of the jsp before the
> thread is running (we bypass this because the thread will write to a
> pre-decided file name). is there another way to do it, without writing to
> the out?
I'm not sure I understand what you mean. Are you asking how to continue
evaluating the JSP while the image is being generated? Easy. Create a
class like this:
public class ParallelImageGenerator
{
public ParallelImageGenerator() { ... }
public String getGeneratedFilename() { ... }
public void start() { ... }
public void wait() { ... }
}
Then, from your tagStart method in your custom tag library, do something
like this:
pig = new ParallelImageGenerator();
pig.start();
jspOut.print("<img src=\"" + pig.getGeneratedFilename() + "\" />");
// Register the 'pig' object somewhere so you can go back and "wait"
// on all of the image generators.
- -chris
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RE: multithreaded with taglibs
Posted by Yair Ben-Meir <ya...@sundaysky.com>.
Sorry chris, I didn't understand u then... it is a good solution (great
minds think alike!).
This solution is good but we must write to the out of the jsp before the
thread is running (we bypass this because the thread will write to a
pre-decided file name). is there another way to do it, without writing to
the out?
I guess not, I m just checking that I m not missing something.
Thanks
Yair
-----Original Message-----
From: Christopher Schultz [mailto:chris@christopherschultz.net]
Sent: Tuesday, November 27, 2007 6:17 PM
To: Tomcat Users List
Subject: Re: multithreaded with taglibs
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
Yair,
Yair Ben-Meir wrote:
> Btw - i thought of something: maybe the img tag will run a thread, return
an
> outout to the page with some new image name, and release the jsp to
> continue. The thread will do the work and save the new image under the
name
> the tag returned to the page. At the end of the page, a "wait" tag will be
> for waiting to whole of the threads to finish. That's the best thing I
> thought of till now.
That's exactly what I was suggesting.
- -chris
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Re: multithreaded with taglibs
Posted by Christopher Schultz <ch...@christopherschultz.net>.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
Yair,
Yair Ben-Meir wrote:
> Btw - i thought of something: maybe the img tag will run a thread, return an
> outout to the page with some new image name, and release the jsp to
> continue. The thread will do the work and save the new image under the name
> the tag returned to the page. At the end of the page, a "wait" tag will be
> for waiting to whole of the threads to finish. That's the best thing I
> thought of till now.
That's exactly what I was suggesting.
- -chris
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RE: multithreaded with taglibs
Posted by Yair Ben-Meir <ya...@sundaysky.com>.
Thanks chris,
The generated output of the JSP is not html and not for an explorer...
that's why it has to be generated along the JSP work.
Btw - i thought of something: maybe the img tag will run a thread, return an
outout to the page with some new image name, and release the jsp to
continue. The thread will do the work and save the new image under the name
the tag returned to the page. At the end of the page, a "wait" tag will be
for waiting to whole of the threads to finish. That's the best thing I
thought of till now.
Thanks
Yair
-----Original Message-----
From: Christopher Schultz [mailto:chris@christopherschultz.net]
Sent: Monday, November 26, 2007 8:44 PM
To: Tomcat Users List
Subject: Re: multithreaded with taglibs
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
Yair,
Yair Ben-Meir wrote:
> You're right about that - it is not for using over the web. Anyway, that's
> just an example. The main issue is to run the work of the tag in a thread
> without making the rest of the page wait.
I think you're hit the nail on the head right there: do the work in a
thread.
FWIW, I think this is an awful idea: if your page renders quickly, the
browser will attempt to load the images before your image threads have a
chance to actually generate the images. The only thing that /might/ work
is to do something like this:
<imageHack:parallel>
<imageHack:image text="foo" />
<imageHack:image text="bar" />
</imageHack:parallel>
The "parallel" tag just sets up an environment for the sub tags. Each
sub tag registers a job with the parent. The "end" method for the
parallel tag starts one or more threads to actually create the images,
then calls join() on each one. This will allow the images to be
generated in parallel instead of serial order.
You can't close the output stream of the web page until all of the
images are created, otherwise you risk broken images showing up on the
page. If you don't wrap your image tags in some kind of wrapper
("parallel" in my example), then you can't gather the threads in a sane
way in order to join() on them all.
Again, this sounds awful. Why not use http URLs instead of file urls?
- -chris
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Re: multithreaded with taglibs
Posted by Christopher Schultz <ch...@christopherschultz.net>.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
Yair,
Yair Ben-Meir wrote:
> You're right about that - it is not for using over the web. Anyway, that's
> just an example. The main issue is to run the work of the tag in a thread
> without making the rest of the page wait.
I think you're hit the nail on the head right there: do the work in a
thread.
FWIW, I think this is an awful idea: if your page renders quickly, the
browser will attempt to load the images before your image threads have a
chance to actually generate the images. The only thing that /might/ work
is to do something like this:
<imageHack:parallel>
<imageHack:image text="foo" />
<imageHack:image text="bar" />
</imageHack:parallel>
The "parallel" tag just sets up an environment for the sub tags. Each
sub tag registers a job with the parent. The "end" method for the
parallel tag starts one or more threads to actually create the images,
then calls join() on each one. This will allow the images to be
generated in parallel instead of serial order.
You can't close the output stream of the web page until all of the
images are created, otherwise you risk broken images showing up on the
page. If you don't wrap your image tags in some kind of wrapper
("parallel" in my example), then you can't gather the threads in a sane
way in order to join() on them all.
Again, this sounds awful. Why not use http URLs instead of file urls?
- -chris
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RE: multithreaded with taglibs
Posted by Yair Ben-Meir <ya...@sundaysky.com>.
You're right about that - it is not for using over the web. Anyway, that's
just an example. The main issue is to run the work of the tag in a thread
without making the rest of the page wait.
-----Original Message-----
From: David Cassidy [mailto:david@twocats.co.uk]
Sent: Monday, November 26, 2007 12:15 PM
To: Tomcat Users List
Subject: RE: multithreaded with taglibs
Errr
how will you allow people to access the file over the internet with a
file:// protocol ?
are you only running the app and the users browser on the same machine ?
file://C:\My Documents\image.gif
?
Can't see that working over the internet....
On Sun, 2007-11-25 at 13:56 +0200, Yair Ben-Meir wrote:
> Thanks, but that's not good for me, I need the page to be with a real file
> link (file://), not through a servlet.
>
>
> -----Original Message-----
> From: Pid [mailto:p@pidster.com]
> Sent: Sunday, November 25, 2007 11:53 AM
> To: Tomcat Users List
> Subject: Re: multithreaded with taglibs
>
> Yair Ben-Meir wrote:
> > Let say that the tag will have to generate the image with a text given
as
> an
> > attribute, and it takes "time" so I want the page to continue:
> >
> > <my:img src="file" text="first"/>
> >
> > .
> >
> > <my:img src="file" text="first"/>
>
> Why are you doing this with a tag, rather than sending the parameter to
> a servlet that serves an image into it's output stream?
>
> You exploit the browsers own request handling capabilities this way.
>
> <img src="/img-app/generate?param1=some+text+here" alt="an image" />
>
>
> p
>
>
>
> > -----Original Message-----
> > From: David Cassidy [mailto:david@twocats.co.uk]
> > Sent: Thursday, November 22, 2007 6:08 PM
> > To: Tomcat Users List
> > Subject: Re: multithreaded with taglibs
> >
> > Hi
> >
> > What is your tag going to produce ?
> > is it an <IMG SRC="....."> type tag ?
> >
> > or how are you allowing the browser to access the image ?
> >
> > Ta
> >
> > D
> >
> > On Thu, 2007-11-22 at 14:57 +0200, Yair Ben-Meir wrote:
> >> Hi
> >>
> >> Is there a way to write a taglib that will do a multithreading work?
> >> Meaning, that tomcatwill not wait till the first instance of the tag
> >> will end, and continue to the rest of the page, and maybe start with
> >> another instance, and than it will insert the result of each instance
> >> in the right place?
> >>
> >>
> >>
> >> Example:
> >>
> >> <my:img name=""/>
> >>
> >> .
> >>
> >> <my:img name=""/>
> >>
> >>
> >>
> >> And let say that each my:img is supposed to download the image and
> >> save it locally or something like that, and I don't want tomcat to
> >> wait till the first tag is finished.
> >>
> >>
> >>
> >>
> >>
> >> Thanks
> >>
> >>
> >>
> >>
> >>
> >> Yair Ben-Meir
> >>
> >>
> >>
> >> Office: 073-7997801
> >>
> >> Fax: 073-7997800
> >>
> >> Mob: 054-5769681
> >>
> >>
> >>
> >>
> >>
> >>
> >
> >
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> >
> >
> >
> >
> >
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> >
>
>
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RE: multithreaded with taglibs
Posted by David Cassidy <da...@twocats.co.uk>.
Errr
how will you allow people to access the file over the internet with a
file:// protocol ?
are you only running the app and the users browser on the same machine ?
file://C:\My Documents\image.gif
?
Can't see that working over the internet....
On Sun, 2007-11-25 at 13:56 +0200, Yair Ben-Meir wrote:
> Thanks, but that's not good for me, I need the page to be with a real file
> link (file://), not through a servlet.
>
>
> -----Original Message-----
> From: Pid [mailto:p@pidster.com]
> Sent: Sunday, November 25, 2007 11:53 AM
> To: Tomcat Users List
> Subject: Re: multithreaded with taglibs
>
> Yair Ben-Meir wrote:
> > Let say that the tag will have to generate the image with a text given as
> an
> > attribute, and it takes "time" so I want the page to continue:
> >
> > <my:img src="file" text="first"/>
> >
> > .
> >
> > <my:img src="file" text="first"/>
>
> Why are you doing this with a tag, rather than sending the parameter to
> a servlet that serves an image into it's output stream?
>
> You exploit the browsers own request handling capabilities this way.
>
> <img src="/img-app/generate?param1=some+text+here" alt="an image" />
>
>
> p
>
>
>
> > -----Original Message-----
> > From: David Cassidy [mailto:david@twocats.co.uk]
> > Sent: Thursday, November 22, 2007 6:08 PM
> > To: Tomcat Users List
> > Subject: Re: multithreaded with taglibs
> >
> > Hi
> >
> > What is your tag going to produce ?
> > is it an <IMG SRC="....."> type tag ?
> >
> > or how are you allowing the browser to access the image ?
> >
> > Ta
> >
> > D
> >
> > On Thu, 2007-11-22 at 14:57 +0200, Yair Ben-Meir wrote:
> >> Hi
> >>
> >> Is there a way to write a taglib that will do a multithreading work?
> >> Meaning, that tomcatwill not wait till the first instance of the tag
> >> will end, and continue to the rest of the page, and maybe start with
> >> another instance, and than it will insert the result of each instance
> >> in the right place?
> >>
> >>
> >>
> >> Example:
> >>
> >> <my:img name=""/>
> >>
> >> .
> >>
> >> <my:img name=""/>
> >>
> >>
> >>
> >> And let say that each my:img is supposed to download the image and
> >> save it locally or something like that, and I don't want tomcat to
> >> wait till the first tag is finished.
> >>
> >>
> >>
> >>
> >>
> >> Thanks
> >>
> >>
> >>
> >>
> >>
> >> Yair Ben-Meir
> >>
> >>
> >>
> >> Office: 073-7997801
> >>
> >> Fax: 073-7997800
> >>
> >> Mob: 054-5769681
> >>
> >>
> >>
> >>
> >>
> >>
> >
> >
> > ---------------------------------------------------------------------
> > To start a new topic, e-mail: users@tomcat.apache.org
> > To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
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> >
> >
> >
> >
> >
> > ---------------------------------------------------------------------
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> >
> >
>
>
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RE: multithreaded with taglibs
Posted by Yair Ben-Meir <ya...@sundaysky.com>.
Thanks, but that's not good for me, I need the page to be with a real file
link (file://), not through a servlet.
-----Original Message-----
From: Pid [mailto:p@pidster.com]
Sent: Sunday, November 25, 2007 11:53 AM
To: Tomcat Users List
Subject: Re: multithreaded with taglibs
Yair Ben-Meir wrote:
> Let say that the tag will have to generate the image with a text given as
an
> attribute, and it takes "time" so I want the page to continue:
>
> <my:img src="file" text="first"/>
>
> .
>
> <my:img src="file" text="first"/>
Why are you doing this with a tag, rather than sending the parameter to
a servlet that serves an image into it's output stream?
You exploit the browsers own request handling capabilities this way.
<img src="/img-app/generate?param1=some+text+here" alt="an image" />
p
> -----Original Message-----
> From: David Cassidy [mailto:david@twocats.co.uk]
> Sent: Thursday, November 22, 2007 6:08 PM
> To: Tomcat Users List
> Subject: Re: multithreaded with taglibs
>
> Hi
>
> What is your tag going to produce ?
> is it an <IMG SRC="....."> type tag ?
>
> or how are you allowing the browser to access the image ?
>
> Ta
>
> D
>
> On Thu, 2007-11-22 at 14:57 +0200, Yair Ben-Meir wrote:
>> Hi
>>
>> Is there a way to write a taglib that will do a multithreading work?
>> Meaning, that tomcatwill not wait till the first instance of the tag
>> will end, and continue to the rest of the page, and maybe start with
>> another instance, and than it will insert the result of each instance
>> in the right place?
>>
>>
>>
>> Example:
>>
>> <my:img name=""/>
>>
>> .
>>
>> <my:img name=""/>
>>
>>
>>
>> And let say that each my:img is supposed to download the image and
>> save it locally or something like that, and I don't want tomcat to
>> wait till the first tag is finished.
>>
>>
>>
>>
>>
>> Thanks
>>
>>
>>
>>
>>
>> Yair Ben-Meir
>>
>>
>>
>> Office: 073-7997801
>>
>> Fax: 073-7997800
>>
>> Mob: 054-5769681
>>
>>
>>
>>
>>
>>
>
>
> ---------------------------------------------------------------------
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> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
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>
>
>
>
>
> ---------------------------------------------------------------------
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Re: multithreaded with taglibs
Posted by Pid <p...@pidster.com>.
Yair Ben-Meir wrote:
> Let say that the tag will have to generate the image with a text given as an
> attribute, and it takes "time" so I want the page to continue:
>
> <my:img src="file" text="first"/>
>
> .
>
> <my:img src="file" text="first"/>
Why are you doing this with a tag, rather than sending the parameter to
a servlet that serves an image into it's output stream?
You exploit the browsers own request handling capabilities this way.
<img src="/img-app/generate?param1=some+text+here" alt="an image" />
p
> -----Original Message-----
> From: David Cassidy [mailto:david@twocats.co.uk]
> Sent: Thursday, November 22, 2007 6:08 PM
> To: Tomcat Users List
> Subject: Re: multithreaded with taglibs
>
> Hi
>
> What is your tag going to produce ?
> is it an <IMG SRC="....."> type tag ?
>
> or how are you allowing the browser to access the image ?
>
> Ta
>
> D
>
> On Thu, 2007-11-22 at 14:57 +0200, Yair Ben-Meir wrote:
>> Hi
>>
>> Is there a way to write a taglib that will do a multithreading work?
>> Meaning, that tomcatwill not wait till the first instance of the tag
>> will end, and continue to the rest of the page, and maybe start with
>> another instance, and than it will insert the result of each instance
>> in the right place?
>>
>>
>>
>> Example:
>>
>> <my:img name=""/>
>>
>> .
>>
>> <my:img name=""/>
>>
>>
>>
>> And let say that each my:img is supposed to download the image and
>> save it locally or something like that, and I don't want tomcat to
>> wait till the first tag is finished.
>>
>>
>>
>>
>>
>> Thanks
>>
>>
>>
>>
>>
>> Yair Ben-Meir
>>
>>
>>
>> Office: 073-7997801
>>
>> Fax: 073-7997800
>>
>> Mob: 054-5769681
>>
>>
>>
>>
>>
>>
>
>
> ---------------------------------------------------------------------
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> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
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>
>
>
>
>
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RE: multithreaded with taglibs
Posted by Yair Ben-Meir <ya...@sundaysky.com>.
Let say that the tag will have to generate the image with a text given as an
attribute, and it takes "time" so I want the page to continue:
<my:img src="file" text="first"/>
.
<my:img src="file" text="first"/>
-----Original Message-----
From: David Cassidy [mailto:david@twocats.co.uk]
Sent: Thursday, November 22, 2007 6:08 PM
To: Tomcat Users List
Subject: Re: multithreaded with taglibs
Hi
What is your tag going to produce ?
is it an <IMG SRC="....."> type tag ?
or how are you allowing the browser to access the image ?
Ta
D
On Thu, 2007-11-22 at 14:57 +0200, Yair Ben-Meir wrote:
> Hi
>
> Is there a way to write a taglib that will do a multithreading work?
> Meaning, that tomcatwill not wait till the first instance of the tag
> will end, and continue to the rest of the page, and maybe start with
> another instance, and than it will insert the result of each instance
> in the right place?
>
>
>
> Example:
>
> <my:img name=""/>
>
> .
>
> <my:img name=""/>
>
>
>
> And let say that each my:img is supposed to download the image and
> save it locally or something like that, and I don't want tomcat to
> wait till the first tag is finished.
>
>
>
>
>
> Thanks
>
>
>
>
>
> Yair Ben-Meir
>
>
>
> Office: 073-7997801
>
> Fax: 073-7997800
>
> Mob: 054-5769681
>
>
>
>
>
>
---------------------------------------------------------------------
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Re: multithreaded with taglibs
Posted by David Cassidy <da...@twocats.co.uk>.
Hi
What is your tag going to produce ?
is it an <IMG SRC="....."> type tag ?
or how are you allowing the browser to access the image ?
Ta
D
On Thu, 2007-11-22 at 14:57 +0200, Yair Ben-Meir wrote:
> Hi
>
> Is there a way to write a taglib that will do a multithreading work?
> Meaning, that tomcatwill not wait till the first instance of the tag
> will end, and continue to the rest of the page, and maybe start with
> another instance, and than it will insert the result of each instance
> in the right place?
>
>
>
> Example:
>
> <my:img name=””/>
>
> …
>
> <my:img name=””/>
>
>
>
> And let say that each my:img is supposed to download the image and
> save it locally or something like that, and I don’t want tomcat to
> wait till the first tag is finished.
>
>
>
>
>
> Thanks
>
>
>
>
>
> Yair Ben-Meir
>
>
>
> Office: 073-7997801
>
> Fax: 073-7997800
>
> Mob: 054-5769681
>
>
>
>
>
>
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