Re: About Static Methods in Ofbiz
Personally I think it's because of the convenience in ftl. We try to use getInstance().method(...) to call methods instead of using static methods. 在 2009-09-09三的 16:36 +0530，Hemanth Kumar Kanamarlapudi写道： Hi Users, Can any one tell me the architectural reason why all the java methods are static and how these will be thread safe Also any implications or the things we need to handle when we are using some third party java objects with out static methods from ofbiz static methods. If any document about this is available please let me know the particular section or page number along with document url. Thanks in advance. Thanks Regards Hemanth http://www.mindtree.com/email/disclaimer.html
Re: About Static Methods in Ofbiz
I'm not the best communicator in these forums, I realize. I understand the service architecture pretty well, and have explored the applications that relate to my business requirement in some depth. I didn't intend to come across as skeptical of the design, but rather, curious as to whether there are performance and/or scaling considerations that are addressed by the static procedure calls. Are server JRE's happier with static members? Is there a lesser need for runtime optimizations? Does this make it simpler to scale the application by deploying multiple servers? It's early in our development effort, but we have been wondering about the scalability of OFBiz (or specifically, of the product/order applications for inventory control and supply chain). I shouldn't change the subject mid-thread this way, so I will try to formulate more specific questions about scaling. I'm hoping for more specific advice than is found here: http://docs.ofbiz.org/display/OFBADMIN/Scaling+and+Performance+Plan I also wonder if anyone can share a case study of OFBiz applied to industrial supply chain, say with multiple facilities or unusual product / work effort configurations. -- James McGill Able Engineering
Re: About Static Methods in Ofbiz
On Sep 10, 2009, at 8:48 PM, James McGill wrote: I'm not the best communicator in these forums, I realize. I understand the service architecture pretty well, and have explored the applications that relate to my business requirement in some depth. I didn't intend to come across as skeptical of the design, but rather, curious as to whether there are performance and/or scaling considerations that are addressed by the static procedure calls. Are server JRE's happier with static members? Is there a lesser need for runtime optimizations? Does this make it simpler to scale the application by deploying multiple servers? With these questions you are implying issues but not actually saying what you are worried about... What is it that concerns you? It's early in our development effort, but we have been wondering about the scalability of OFBiz (or specifically, of the product/order applications for inventory control and supply chain). I shouldn't change the subject mid-thread this way, so I will try to formulate more specific questions about scaling. I'm hoping for more specific advice than is found here: http://docs.ofbiz.org/display/OFBADMIN/Scaling+and+Performance+Plan I also wonder if anyone can share a case study of OFBiz applied to industrial supply chain, say with multiple facilities or unusual product / work effort configurations. Are you worried about the customization side of things, or the scaling side of things? Or, perhaps both? If you haven't already you could check out the OFBiz users wiki page to see some of the end-users and a bit about what they've done with OFBiz (usually not a lot of details, but general ideas and company names are sometimes enough). -David
Re: About Static Methods in Ofbiz
One of the top 10 banks in China (top 30 in Asia, top 300 worldwide) is building its core system on OFBiz. Many banks are waiting to see the result. If success, David can announce OFBiz has reached the goal on affecting 20% of world economy :). Hope this will come true soon. 在 2009-09-10四的 21:51 -0600，David E Jones写道： On Sep 10, 2009, at 8:48 PM, James McGill wrote: I'm not the best communicator in these forums, I realize. I understand the service architecture pretty well, and have explored the applications that relate to my business requirement in some depth. I didn't intend to come across as skeptical of the design, but rather, curious as to whether there are performance and/or scaling considerations that are addressed by the static procedure calls. Are server JRE's happier with static members? Is there a lesser need for runtime optimizations? Does this make it simpler to scale the application by deploying multiple servers? With these questions you are implying issues but not actually saying what you are worried about... What is it that concerns you? It's early in our development effort, but we have been wondering about the scalability of OFBiz (or specifically, of the product/order applications for inventory control and supply chain). I shouldn't change the subject mid-thread this way, so I will try to formulate more specific questions about scaling. I'm hoping for more specific advice than is found here: http://docs.ofbiz.org/display/OFBADMIN/Scaling+and+Performance+Plan I also wonder if anyone can share a case study of OFBiz applied to industrial supply chain, say with multiple facilities or unusual product / work effort configurations. Are you worried about the customization side of things, or the scaling side of things? Or, perhaps both? If you haven't already you could check out the OFBiz users wiki page to see some of the end-users and a bit about what they've done with OFBiz (usually not a lot of details, but general ideas and company names are sometimes enough). -David
Re: About Static Methods in Ofbiz
On Thu, Sep 10, 2009 at 8:51 PM, David E Jones d...@me.com wrote: With these questions you are implying issues but not actually saying what you are worried about... What is it that concerns you? My instincts tell me what I need to know personally, but I am anticipating questions from the people who drive my project, that's all. OFBiz isn't something with enough mindshare to build its own confidence among the suits, and it falls on me to sell it. I know there are plenty of people using OFBiz successfully, but none of them quite matches our particular square peg; a specialized type of supply chain management in aerospace engineering. Are you worried about the customization side of things, or the scaling side of things? Or, perhaps both? We are finding Product and Order to be a very good starting point, actually, and we just need to add some industry-specific details to the inventory process, and we have some work to do because our concept of work effort doesn't quite match what's defined in OFBiz out-of-the-box. It doesn't seem like a huge job so we are fairly confident (and wish to give kudos to you and everyone who has worked to get the application this far!) We don't even expect to face many scaling issues, just basic concerns about what will happen when we have to deploy in two or three facilities that might not be able to share a database instance, or what happens when inventory and order records get really large. Our senior management is understandably risk-averse, since the situation that leads us to a customized solution is a result of failure of other solutions to scale to our current needs. It's up to me to reassure them, but I'm mainly going on instincts and hope and my own evaluation of the framework. I've probably talked too much under the subject of Static methods, since that's not really my concern. I would still very much enjoy hearing from anyone who has done supply chain and inventory control work in OFBiz, especially if their model doesn't quite match what OFBiz's model of manufacturing. -- James McGill Able Engineering
Re: About Static Methods in Ofbiz
I don't know what you mean by all the Java methods are static. There are some static methods in utility classes, but that is standard practice in Java programming. The static methods are thread safe because there is no instance of the enclosing class. In other words, the utility class does not have a state that can be altered by threads. -Adrian Hemanth Kumar Kanamarlapudi wrote: Hi Users, Can any one tell me the architectural reason why all the java methods are static and how these will be thread safe Also any implications or the things we need to handle when we are using some third party java objects with out static methods from ofbiz static methods. If any document about this is available please let me know the particular section or page number along with document url. Thanks in advance. Thanks Regards Hemanth http://www.mindtree.com/email/disclaimer.html
Re: About Static Methods in Ofbiz
There is a little bit more to being thread-safe. The biggest danger comes when a static method refers to a static/class field because it may be used by multiple threads at the same time. This has happened a few times in the history of OFBiz, and hopefully there isn't anything like this in the code right now (and there are none that I am aware of), but there could be. -David On Sep 9, 2009, at 8:52 AM, Adrian Crum wrote: I don't know what you mean by all the Java methods are static. There are some static methods in utility classes, but that is standard practice in Java programming. The static methods are thread safe because there is no instance of the enclosing class. In other words, the utility class does not have a state that can be altered by threads. -Adrian Hemanth Kumar Kanamarlapudi wrote: Hi Users, Can any one tell me the architectural reason why all the java methods are static and how these will be thread safe Also any implications or the things we need to handle when we are using some third party java objects with out static methods from ofbiz static methods. If any document about this is available please let me know the particular section or page number along with document url. Thanks in advance. Thanks Regards Hemanth http://www.mindtree.com/email/disclaimer.html
Re: About Static Methods in Ofbiz
On Wed, Sep 9, 2009 at 7:52 AM, Adrian Crum adri...@hlmksw.com wrote: I don't know what you mean by all the Java methods are static. -Adrian With very few exceptions, all the service methods in all the applications, as far as I've seen, are static. I'm sure there's a solid rationale for this approach, but I'd like to know the details. It seems to make it more of a Class - function oriented design, not Object oriented, and it's unusual Java. -- James McGill Able Engineering Phoenix, Arizona
Re: About Static Methods in Ofbiz
On Sep 9, 2009, at 2:29 PM, James McGill wrote: On Wed, Sep 9, 2009 at 7:52 AM, Adrian Crum adri...@hlmksw.com wrote: I don't know what you mean by all the Java methods are static. -Adrian With very few exceptions, all the service methods in all the applications, as far as I've seen, are static. I'm sure there's a solid rationale for this approach, but I'd like to know the details. It seems to make it more of a Class - function oriented design, not Object oriented, and it's unusual Java. You're right, services are not object-oriented, they follow a service oriented architecture. You can use objects within the services, but the point of them is to operate in a more isolated and well-defined context. In other words they should only know about the parameters passed in and what they can find in the database or by calling another service, and likewise they should only persist in the database or by calling other services. To better understand the architecture of OFBiz and to get an idea of the big picture (which will help this make more sense), please watch the framework introduction videos available here: http://docs.ofbiz.org/display/OFBTECH/Framework+Introduction+Videos+and+Diagrams -David
