Re: Struts Chain... seams similar to HiveMind ?EOM
It's possible that there is some overlap. You might be able to register Commands as HiveMind services. But HiveMind has a much broader scope than Commons Chain. Commons Chain is an implementation of the classic Chain of Command pattern. Period. It has no other scope or aspirations. People can drop it in wherever you might want to implement a Chain of Command. No muss, no fuss. HiveMind is a configuration framework that you could use throughout an application and within a Command. You might, for example, register the Catalog as a HiveMind service, and the Commands might use HiveMind to find the Catalog(s). But, that would be up to the developer. Commons Chain does not need to decided how the Catalog is discovered. People might also use HiveMind to load the Chain configuration file as an alternative to the Digester. Struts Chain is whiteboard reimplementation of the Request Processor using Commons Chain. I don't believe that the Request Processor would be easier to implement as a nest of HiveMind services. -Ted. Vic Cekvenich wrote: Struts Chain... seams similar to HiveMind ? Am I wrong? .V - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] -- Ted Husted, Junit in Action - http://www.manning.com/massol/, Struts in Action - http://husted.com/struts/book.html, JSP Site Design - http://www.amazon.com/exec/obidos/ISBN=1861005512. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Struts Chain... seams similar to HiveMind ?EOM
Struts Chain... seams similar to HiveMind ? Am I wrong? .V - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Struts Chain... seams similar to HiveMind ?EOM
While both concern wiring code together using xml, I think the similarity ends there. Hivemind, from my cursory overview, seems more like another Inversion of Control (IoC) framework like Avalon, PicoContainer, and Spring. It is takes services and manages their dependencies and lifecycle, allowing the developer to organize code as a series of services. Struts chain links commands together into to create a process flow. Commands are very simple objects, like Struts Actions, implementing the execute() method to perform its tasks. There is no concept of service contracts and implementations and all non-primitive dependencies, AFAIK, are satisifed by putting them in the Context object by a previous command rather than having the container manage service dependencies. Since they are solving two different problems, both actually work pretty good together. I've been using Spring lately and have found it a great compliment to a Struts application (http://struts.sf.net/struts-spring). I'm sure HiveMind would also serve a similar purpose well. Don On Wed, 29 Oct 2003, Vic Cekvenich wrote: Struts Chain... seams similar to HiveMind ? Am I wrong? .V - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Struts Chain... seams similar to HiveMind ?EOM
On Wed, 29 Oct 2003, Vic Cekvenich wrote: Struts Chain... seams similar to HiveMind ? If you mean in roughly the same way that apples are similar to oranges, then I'd agree with you. ;-) Otherwise, no, I don't see similarity. HiveMind is a services and configuration microkernel or a centralized registry of services and configuration points, depending on which part of the home page you read. (It also doesn't have any particular purpose. ;) Struts Chain is an attempt to refactor the request processor in terms of the GoF Chain of Responsibility pattern. It's certainly not a microkernel or a framework of any kind. The chain config itself (which is not part of Struts Chain per se) could be considered as a registry of sorts, but it's quite different to what HiveMind's registry is all about. -- Martin Cooper Am I wrong? .V - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Struts Chain... seams similar to HiveMind ?EOM
But... the chain has a set of steps that are pre-progrmed, and there was some discusion as to what those steps should be idealy. Yes, it can do return codes but If HiveMind (or an aproach like it) is used to do the chain, then I can easily add interceptors, and alterantice idea for consideration I found this very educational: http://jakarta.apache.org/~hlship/HiveMind.ppt ... and based on that I made a leap, that, hey, we can intercept the flow. A bit of AOP. (There are some other ideas in there, like code to the interface contract) .V - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Struts Chain... seams similar to HiveMind ?EOM
On Wed, 29 Oct 2003, Vic Cekvenich wrote: But... the chain has a set of steps that are pre-progrmed, and there was some discusion as to what those steps should be idealy. Yes, it can do return codes but If HiveMind (or an aproach like it) is used to do the chain, then I can easily add interceptors, and alterantice idea for consideration The chain supports the interceptors as well. A command can have any number of commands with each having commands and so on. I found this very educational: http://jakarta.apache.org/~hlship/HiveMind.ppt ... and based on that I made a leap, that, hey, we can intercept the flow. A bit of AOP. (There are some other ideas in there, like code to the interface contract) Since you can already intercept the flow with the chain, I don't see what an IoC, if even applicable, could offer. Struts needs a composible process flow that is easily manipulatable and pluggable. I agree all those other fancy service-oriented features are nice, but IMO, they belong in the action/form layer. Don .V - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
