Grails on Groovy > Grails 2.X > How is the invocation sequence of Grails filters defined | Sequence of Filter Execution

I am using filters to handle authentication and some other pre-condition checks for a Grails application. I've run into a situation where it'd be nice to ensure that filter A is always invoked before filter B

If several filters are declared within one class, it's obvious that they'll be executed in the order that they were declared like below code block.

package com.pkm class SecurityFilters { def filters = { filter1(controller:'*', action:'*') { before = { println("FILTER-1") } after = { Map model -> } afterView = { Exception e -> } } filter2(uri: "/**") { before = { println("FILTER-2") } after = { Map model -> } afterView = { Exception e -> } } } }

Now what will happen if they would defined in different classes. Yes, there is a way around and that is dependsOn. You can define dependsOn on which filter it will depend on. Say I created another filter named Security2Filters and set my first filter named SecurityFilters to dependsOn. So SecirutyFilters will be execute before Security2Filters.

package com.pkm class Security2Filters { def dependsOn=[SecurityFilters] def filters = { all(controller:'*', action:'*') { before = { println("FILTER-3") } after = { Map model -> } afterView = { Exception e -> } } } }