Servlet Caching question
Hello, I wanted to know how Tomcat caches the output of Servlets/JSPs. Could someone direct me to where I could find some information on that? _ Atreya Basu Developer, Greenfield Research Inc. e-mail: atreya (at) greenfieldresearch (dot) ca
RE: Servlet Caching question
Howdy, Basically, tomcat doesn't. Yoav Shapira Millennium ChemInformatics -Original Message- From: Atreya Basu [mailto:[EMAIL PROTECTED] Sent: Friday, July 25, 2003 12:42 PM To: [EMAIL PROTECTED] Subject: Servlet Caching question Hello, I wanted to know how Tomcat caches the output of Servlets/JSPs. Could someone direct me to where I could find some information on that? _ Atreya Basu Developer, Greenfield Research Inc. e-mail: atreya (at) greenfieldresearch (dot) ca This e-mail, including any attachments, is a confidential business communication, and may contain information that is confidential, proprietary and/or privileged. This e-mail is intended only for the individual(s) to whom it is addressed, and may not be saved, copied, printed, disclosed or used by anyone else. If you are not the(an) intended recipient, please immediately delete this e-mail from your computer system and notify the sender. Thank you. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Servlet Caching question
Okay, So if I want to do some caching for say: GET requests. Is there a way to cache output based on URL? Is this kind of thing simply not supported, and I will have to go to some other application server. _ Atreya Basu Developer, Greenfield Research Inc. e-mail: atreya (at) greenfieldresearch (dot) ca -Original Message- From: Shapira, Yoav [mailto:[EMAIL PROTECTED] Sent: July 25, 2003 1:59 PM To: Tomcat Users List Subject: RE: Servlet Caching question Howdy, Basically, tomcat doesn't. Yoav Shapira Millennium ChemInformatics -Original Message- From: Atreya Basu [mailto:[EMAIL PROTECTED] Sent: Friday, July 25, 2003 12:42 PM To: [EMAIL PROTECTED] Subject: Servlet Caching question Hello, I wanted to know how Tomcat caches the output of Servlets/JSPs. Could someone direct me to where I could find some information on that? _ Atreya Basu Developer, Greenfield Research Inc. e-mail: atreya (at) greenfieldresearch (dot) ca This e-mail, including any attachments, is a confidential business communication, and may contain information that is confidential, proprietary and/or privileged. This e-mail is intended only for the individual(s) to whom it is addressed, and may not be saved, copied, printed, disclosed or used by anyone else. If you are not the(an) intended recipient, please immediately delete this e-mail from your computer system and notify the sender. Thank you. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Servlet Caching question
Just one question: The output from a servlet/JSP is dynamic, so why would you want to cache the output? -Original Message- From: Atreya Basu [mailto:[EMAIL PROTECTED] Sent: 25 July 2003 18:03 To: 'Tomcat Users List' Subject: RE: Servlet Caching question Okay, So if I want to do some caching for say: GET requests. Is there a way to cache output based on URL? Is this kind of thing simply not supported, and I will have to go to some other application server. _ Atreya Basu Developer, Greenfield Research Inc. e-mail: atreya (at) greenfieldresearch (dot) ca -Original Message- From: Shapira, Yoav [mailto:[EMAIL PROTECTED] Sent: July 25, 2003 1:59 PM To: Tomcat Users List Subject: RE: Servlet Caching question Howdy, Basically, tomcat doesn't. Yoav Shapira Millennium ChemInformatics -Original Message- From: Atreya Basu [mailto:[EMAIL PROTECTED] Sent: Friday, July 25, 2003 12:42 PM To: [EMAIL PROTECTED] Subject: Servlet Caching question Hello, I wanted to know how Tomcat caches the output of Servlets/JSPs. Could someone direct me to where I could find some information on that? _ Atreya Basu Developer, Greenfield Research Inc. e-mail: atreya (at) greenfieldresearch (dot) ca This e-mail, including any attachments, is a confidential business communication, and may contain information that is confidential, proprietary and/or privileged. This e-mail is intended only for the individual(s) to whom it is addressed, and may not be saved, copied, printed, disclosed or used by anyone else. If you are not the(an) intended recipient, please immediately delete this e-mail from your computer system and notify the sender. Thank you. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Servlet Caching question
Howdy, Actually, caching of servlet/JSP output is not a rare request, and is sometimes valid. Especially if there is a common set of request parameters (ViewPage?pageId=... where the pageId has three values that are very common). It would be fairly trivial to write a URL-based caching filter. One does not come with tomcat, but it's less than a 20 minutes effort to write I think. Yoav Shapira Millennium ChemInformatics -Original Message- From: Bodycombe, Andrew [mailto:[EMAIL PROTECTED] Sent: Friday, July 25, 2003 1:06 PM To: 'Tomcat Users List' Subject: RE: Servlet Caching question Just one question: The output from a servlet/JSP is dynamic, so why would you want to cache the output? -Original Message- From: Atreya Basu [mailto:[EMAIL PROTECTED] Sent: 25 July 2003 18:03 To: 'Tomcat Users List' Subject: RE: Servlet Caching question Okay, So if I want to do some caching for say: GET requests. Is there a way to cache output based on URL? Is this kind of thing simply not supported, and I will have to go to some other application server. _ Atreya Basu Developer, Greenfield Research Inc. e-mail: atreya (at) greenfieldresearch (dot) ca -Original Message- From: Shapira, Yoav [mailto:[EMAIL PROTECTED] Sent: July 25, 2003 1:59 PM To: Tomcat Users List Subject: RE: Servlet Caching question Howdy, Basically, tomcat doesn't. Yoav Shapira Millennium ChemInformatics -Original Message- From: Atreya Basu [mailto:[EMAIL PROTECTED] Sent: Friday, July 25, 2003 12:42 PM To: [EMAIL PROTECTED] Subject: Servlet Caching question Hello, I wanted to know how Tomcat caches the output of Servlets/JSPs. Could someone direct me to where I could find some information on that? _ Atreya Basu Developer, Greenfield Research Inc. e-mail: atreya (at) greenfieldresearch (dot) ca This e-mail, including any attachments, is a confidential business communication, and may contain information that is confidential, proprietary and/or privileged. This e-mail is intended only for the individual(s) to whom it is addressed, and may not be saved, copied, printed, disclosed or used by anyone else. If you are not the(an) intended recipient, please immediately delete this e-mail from your computer system and notify the sender. Thank you. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] This e-mail, including any attachments, is a confidential business communication, and may contain information that is confidential, proprietary and/or privileged. This e-mail is intended only for the individual(s) to whom it is addressed, and may not be saved, copied, printed, disclosed or used by anyone else. If you are not the(an) intended recipient, please immediately delete this e-mail from your computer system and notify the sender. Thank you. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Servlet Caching question
Because I might decide that hmm, this page's content really doesn't change very often, so why don't I cache its results for 5 minutes? For example, one page might contain many different 'pagelets', say a little weather box with the current weather conditions. If your weather conditions are only updated every hour, why are you dynamically generating that little pagelet every request (which can be anywhere from 2 in an hour to several thousand). You'd cache that pagelet, and set it to expire every hour. -Original Message- From: Bodycombe, Andrew [mailto:[EMAIL PROTECTED] Sent: Friday, July 25, 2003 12:06 PM To: 'Tomcat Users List' Subject: RE: Servlet Caching question Just one question: The output from a servlet/JSP is dynamic, so why would you want to cache the output? -Original Message- From: Atreya Basu [mailto:[EMAIL PROTECTED] Sent: 25 July 2003 18:03 To: 'Tomcat Users List' Subject: RE: Servlet Caching question Okay, So if I want to do some caching for say: GET requests. Is there a way to cache output based on URL? Is this kind of thing simply not supported, and I will have to go to some other application server. _ Atreya Basu Developer, Greenfield Research Inc. e-mail: atreya (at) greenfieldresearch (dot) ca -Original Message- From: Shapira, Yoav [mailto:[EMAIL PROTECTED] Sent: July 25, 2003 1:59 PM To: Tomcat Users List Subject: RE: Servlet Caching question Howdy, Basically, tomcat doesn't. Yoav Shapira Millennium ChemInformatics -Original Message- From: Atreya Basu [mailto:[EMAIL PROTECTED] Sent: Friday, July 25, 2003 12:42 PM To: [EMAIL PROTECTED] Subject: Servlet Caching question Hello, I wanted to know how Tomcat caches the output of Servlets/JSPs. Could someone direct me to where I could find some information on that? _ Atreya Basu Developer, Greenfield Research Inc. e-mail: atreya (at) greenfieldresearch (dot) ca This e-mail, including any attachments, is a confidential business communication, and may contain information that is confidential, proprietary and/or privileged. This e-mail is intended only for the individual(s) to whom it is addressed, and may not be saved, copied, printed, disclosed or used by anyone else. If you are not the(an) intended recipient, please immediately delete this e-mail from your computer system and notify the sender. Thank you. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Servlet Caching question
That makes sense. I'd always considered that it was too dangerous to cache servlet output. I might try implementing this Filter and try to gain some performance... -Original Message- From: Shapira, Yoav [mailto:[EMAIL PROTECTED] Sent: 25 July 2003 18:17 To: Tomcat Users List Subject: RE: Servlet Caching question Howdy, Actually, caching of servlet/JSP output is not a rare request, and is sometimes valid. Especially if there is a common set of request parameters (ViewPage?pageId=... where the pageId has three values that are very common). It would be fairly trivial to write a URL-based caching filter. One does not come with tomcat, but it's less than a 20 minutes effort to write I think. Yoav Shapira Millennium ChemInformatics -Original Message- From: Bodycombe, Andrew [mailto:[EMAIL PROTECTED] Sent: Friday, July 25, 2003 1:06 PM To: 'Tomcat Users List' Subject: RE: Servlet Caching question Just one question: The output from a servlet/JSP is dynamic, so why would you want to cache the output? -Original Message- From: Atreya Basu [mailto:[EMAIL PROTECTED] Sent: 25 July 2003 18:03 To: 'Tomcat Users List' Subject: RE: Servlet Caching question Okay, So if I want to do some caching for say: GET requests. Is there a way to cache output based on URL? Is this kind of thing simply not supported, and I will have to go to some other application server. _ Atreya Basu Developer, Greenfield Research Inc. e-mail: atreya (at) greenfieldresearch (dot) ca -Original Message- From: Shapira, Yoav [mailto:[EMAIL PROTECTED] Sent: July 25, 2003 1:59 PM To: Tomcat Users List Subject: RE: Servlet Caching question Howdy, Basically, tomcat doesn't. Yoav Shapira Millennium ChemInformatics -Original Message- From: Atreya Basu [mailto:[EMAIL PROTECTED] Sent: Friday, July 25, 2003 12:42 PM To: [EMAIL PROTECTED] Subject: Servlet Caching question Hello, I wanted to know how Tomcat caches the output of Servlets/JSPs. Could someone direct me to where I could find some information on that? _ Atreya Basu Developer, Greenfield Research Inc. e-mail: atreya (at) greenfieldresearch (dot) ca This e-mail, including any attachments, is a confidential business communication, and may contain information that is confidential, proprietary and/or privileged. This e-mail is intended only for the individual(s) to whom it is addressed, and may not be saved, copied, printed, disclosed or used by anyone else. If you are not the(an) intended recipient, please immediately delete this e-mail from your computer system and notify the sender. Thank you. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] This e-mail, including any attachments, is a confidential business communication, and may contain information that is confidential, proprietary and/or privileged. This e-mail is intended only for the individual(s) to whom it is addressed, and may not be saved, copied, printed, disclosed or used by anyone else. If you are not the(an) intended recipient, please immediately delete this e-mail from your computer system and notify the sender. Thank you. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Servlet Caching question
Andrew, Our JSP/Servlets perform some calculations based on some input from a HTML Form. These calculations are a little bit complicated so they take time to perform. However the output that they produce is relatively small. The majority of our users will give the same input, so the output is also known for those cases. If we can map the input given in the form of a GET request (i.e. the URL) to a cache of outputs, we could save a lot of time. So that is why we would like to cache the output. Another question I have is, once a Servlet is executed, does it get stored in memory so that it doesn't have to be read off the disc next time? _ Atreya Basu Developer, Greenfield Research Inc. e-mail: atreya (at) greenfieldresearch (dot) ca -Original Message- From: Bodycombe, Andrew [mailto:[EMAIL PROTECTED] Sent: July 25, 2003 2:06 PM To: 'Tomcat Users List' Subject: RE: Servlet Caching question Just one question: The output from a servlet/JSP is dynamic, so why would you want to cache the output? -Original Message- From: Atreya Basu [mailto:[EMAIL PROTECTED] Sent: 25 July 2003 18:03 To: 'Tomcat Users List' Subject: RE: Servlet Caching question Okay, So if I want to do some caching for say: GET requests. Is there a way to cache output based on URL? Is this kind of thing simply not supported, and I will have to go to some other application server. _ Atreya Basu Developer, Greenfield Research Inc. e-mail: atreya (at) greenfieldresearch (dot) ca -Original Message- From: Shapira, Yoav [mailto:[EMAIL PROTECTED] Sent: July 25, 2003 1:59 PM To: Tomcat Users List Subject: RE: Servlet Caching question Howdy, Basically, tomcat doesn't. Yoav Shapira Millennium ChemInformatics -Original Message- From: Atreya Basu [mailto:[EMAIL PROTECTED] Sent: Friday, July 25, 2003 12:42 PM To: [EMAIL PROTECTED] Subject: Servlet Caching question Hello, I wanted to know how Tomcat caches the output of Servlets/JSPs. Could someone direct me to where I could find some information on that? _ Atreya Basu Developer, Greenfield Research Inc. e-mail: atreya (at) greenfieldresearch (dot) ca This e-mail, including any attachments, is a confidential business communication, and may contain information that is confidential, proprietary and/or privileged. This e-mail is intended only for the individual(s) to whom it is addressed, and may not be saved, copied, printed, disclosed or used by anyone else. If you are not the(an) intended recipient, please immediately delete this e-mail from your computer system and notify the sender. Thank you. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Servlet Caching question
Howdy, Our JSP/Servlets perform some calculations based on some input from a HTML Form. These calculations are a little bit complicated so they take time to perform. However the output that they produce is relatively small. The majority of our users will give the same input, so the output is also known for those cases. If we can map the input given in the form of a GET request (i.e. the URL) to a cache of outputs, we could save a lot of time. For this case, I would actually consider doing the pre-calculation and result caching in the calculator object or something hanging off of it, rather than the servlet output. That's because the output is small, so it's not like you're saving presentation/layout effort. Rather, you're trying to speed up business object creation. Another question I have is, once a Servlet is executed, does it get stored in memory so that it doesn't have to be read off the disc next time? This is a basic java question (or rather OS/JVM question). Once a class is loaded, it's kept in memory, in a special section of the memory allocated to the JVM (known as the Permanent Generation). However, the creation and destruction of servlet instances is up to the container, although those are in-memory operation. As an aside, the penalty for loading a class from disk is tiny and if that's your worst performance bottleneck, you should publish a paper about your application ;) Yoav Shapira This e-mail, including any attachments, is a confidential business communication, and may contain information that is confidential, proprietary and/or privileged. This e-mail is intended only for the individual(s) to whom it is addressed, and may not be saved, copied, printed, disclosed or used by anyone else. If you are not the(an) intended recipient, please immediately delete this e-mail from your computer system and notify the sender. Thank you. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
