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Servlets priority

Posted on 2003-11-16
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Last Modified: 2013-11-24
Hi all
Is it possible to priorities servlets?
I have two different servlets, I want to be able to control which clients handled first.
One of the servlets is more important.
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Question by:dannysh
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6 Comments
 
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Accepted Solution

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CEHJ earned 40 total points
ID: 9758760
The servlets will be called in the order your program flow decides. If you mean can you prioritise the order in which they load on startup then you can change the loadonstartup tag of the servlet in your web.xml. The lower the figure the earlier the load. Here's an example:

<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application
2.2//EN"
    "http://java.sun.com/j2ee/dtds/web-app_2_2.dtd">
<web-app>
 <servlet>
  <servlet-name>deegreewms</servlet-name>
  <servlet-class>org.deegree_impl.enterprise.WMSServlet</servlet-class>
  <init-param>
   <param-name>capabilities</param-name>

<param-value>file:///C:/daten/software/geotools/deegreewms/WEB-INF/xml/sample_wms_capabilities.xml</param-value>

  </init-param>
  <init-param>
   <param-name>debug</param-name>
   <param-value>ERRORS_AND_COMMENTS</param-value>
  </init-param>
  <load-on-startup>
   1
  </load-on-startup>
 </servlet>
 <servlet-mapping>
  <servlet-name>deegreewms</servlet-name>
  <url-pattern>/wms</url-pattern>
 </servlet-mapping>
</web-app>


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Expert Comment

by:objects
ID: 9759799
Am not aware of anything to achieve that, and thinking I'm not sure how you would achive it. Generally client requests are recieved by the server sequentially and each processed seperately, they don't wait for the previous request to be handled.
What is it exactly that you'd like to do instead?
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LVL 86

Expert Comment

by:CEHJ
ID: 9760025
If you're looking for a processing 'pipeline'  methodology/pattern, then a sequence of Struts Action may fit the bill
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LVL 92

Expert Comment

by:objects
ID: 9761998
load-on-startup has nothing to do with priority of client requests.
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Author Comment

by:dannysh
ID: 9762033
Hi Objects yes I know.
I close this question by mistake, sorry. I will open it again

http://www.experts-exchange.com/Programming/Programming_Languages/Java/Q_20800063.html
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LVL 86

Expert Comment

by:CEHJ
ID: 9763244
>>load-on-startup has nothing to do with priority of client requests.

I hope you or dannysh didn't think that I suggested that ;-)
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