Servlet inter-communication

[Samuli Elomaa <sa...@pp.inet.fi>]

Hi,
Is there any otherway for two servlets in same tomcat to communicate  
together except by http requests? Eg. could two servlets use somekind  
of shared memory? or send signals to each other?

Samuli

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Re: Servlet inter-communication

[Michael Echerer <me...@tngtech.com>]

Samuli Elomaa wrote:
> Hi,
> Is there any otherway for two servlets in same tomcat to communicate 
> together except by http requests? Eg. could two servlets use somekind 
> of shared memory? or send signals to each other?

Hi,

whatever others suggested, just use the Servlet Spec 2.3+ standard:

The webapp context scoped shared memory is here:

http://tomcat.apache.org/tomcat-5.5-doc/servletapi/javax/servlet/ServletContext.html#setAttribute(java.lang.String,%20java.lang.Object)
http://tomcat.apache.org/tomcat-5.5-doc/servletapi/javax/servlet/ServletContext.html#getAttribute(java.lang.String)

The event listener is here:

http://tomcat.apache.org/tomcat-5.5-doc/servletapi/javax/servlet/ServletContextAttributeListener.html

Singletons are evil, even more devilish for webapps. ;-)

Cheers,
Michael



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