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The following page has been changed by DennisKubes: http://wiki.apache.org/nutch/Nutch2Architecture The comment on the change is: Changed DI for configuration and reflection utils ------------------------------------------------------------------------------ == Overview == * Reuse of existing Nutch codebase * While some things will change this architecture is more of a refactor than a complete re-write. Much of the existing codebase including plugin functionality should be reused. - * Dependency Injection - * Remove the plugin framework and use a DI framework, Spring for example, to create mapper and reducer classes that are auto injected with dependencies. This will take modifications to the Hadoop codebase. + * Remove the plugin framework + * After some experimenting, DI using spring or another similar framework presents problems. Good news is that we can achieve the same thing using the configuration objects from hadoop along with creating new instances using reflectionutils. This is more service locator than dependency injection but it still gives us the same benefits. + * Have the ability to change the jobconfiguration settings for tools. This can be accomplished through some type of properties file on the classpath and would be useful for testing, for example the ability to switch out an outputformat to see the output in text format. * Have mock objects that make it easy to test jobs. == Data Structures ==
