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filter order [message #696857]

Fri, 15 July 2011 00:55

David

Messages: 6
Registered: July 2011

Junior Member

I was wondering if there was a way for the code to move to the next filter that matches the URLPattern if the snap name is not found. If not is there a way to say check this filter and if the URL Pattern doesn't match then move to this filter.

<?xml version="1.0" encoding="ISO-8859-1"?>
<web-app 
    version="2.5">

  
    <filter>
    	<filter-name>host-filter</filter-name>
    	<filter-class>org.eclipse.virgo.snaps.core.SnapHostFilter</filter-class>
    </filter>

    <filter-mapping>
        <filter-name>host-filter</filter-name>
        <url-pattern>/*</url-pattern>
        <dispatcher>REQUEST</dispatcher>
        <dispatcher>INCLUDE</dispatcher>
        <dispatcher>FORWARD</dispatcher>
    </filter-mapping>
    
	<listener>
		<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
	</listener>

	<context-param>
		<param-name>contextClass</param-name>
		<param-value>org.eclipse.virgo.web.dm.ServerOsgiBundleXmlWebApplicationContext</param-value>
	</context-param>
	
	<!-- Handles all requests into the slice -->
	<servlet>
		<servlet-name>standard</servlet-name>
		<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
		<load-on-startup>2</load-on-startup>
		<init-param>
			<param-name>contextClass</param-name>
			<param-value>org.eclipse.virgo.web.dm.ServerOsgiBundleXmlWebApplicationContext</param-value>
		</init-param>
	</servlet>

	<servlet-mapping>
		<servlet-name>standard</servlet-name>
		<url-pattern>*.htm</url-pattern>
	</servlet-mapping>

	<filter>
		<filter-name>httpMethodFilter</filter-name>
		<filter-class>org.springframework.web.filter.HiddenHttpMethodFilter</filter-class>
	</filter>

	<filter-mapping>
		<filter-name>httpMethodFilter</filter-name>
		<servlet-name>standard</servlet-name>
	</filter-mapping>
</web-app>

I want it to check the MethodFilter first. I don't mind if I put all methods in a /services subdir and then if the URL doesn't match /services then it checks the ssnaps.

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Re: filter order [message #697025 is a reply to message #696857]

Fri, 15 July 2011 10:40

Chris Frost

Messages: 230
Registered: January 2010
Location: Southampton, England

Senior Member

Hi,

Snaps is designed to work without affecting the normal flow of an application. So, the normal rules about filter ordering apply, they are given by the Servlet spec and are nothing to do with us. If the Snaps filter can't find a matching Snap then it simply does nothing and calls doFilter() on the filter chain to pass the request on. This means you have two choices and I'm not quite sure on your requirement so I'm not sure which is best.

1. Move the Snaps filter to come after the MethodFilter in your web.xml. This means the Method filter would get to look at requests firsts and the order of the Filter chain depends on the order in which they are defined in the web.xml

2. Put the Snaps filter under a sub-path so that only those requests will result in the Snaps filter going in the filter chain.

Hope that helps, please ask back if not

------------------------------------------------
Chris Frost, Twitter @cgfrost
Springsource, a divison of VMware.

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