Hei Landon, with respect to your questions to Erwan please have also a look on the google-doc document. As far as i know you were one of the persons having acceess to it ... In that doc is a very brief sketch of the system.
otherwise i send you a copy of the doc stefan Sunburned Surveyor schrieb: > Juliana, > > I'm not sure if you have posted to the mailing list before. If you > haven't I want to extend you a warm welcome. If you have, please forgive > me for my faulty memory. > > It sounds like we will have a solution to the memory problem in OpenJUMP > very soon! This is good news for you and I. :] > > Erwan, > > There is no way I'll be able to have my FeatureCache finished in a > month. So I am glad to hear your lab is working on a solution that will > be available much sooner. It would be foolish of me to continue work on > the FeatueCache if you are designing something similar. I know that you > said some documentation will be up in a few days, but I was wondering if > you would be able to answer a couple of quick questions. > > Will your solution allow us to work with different types of data > sources, or just ESRI Shapefiles? > > Will it incorporate an external database, and if so, which one? > > Thanks, > > The Sunburned Surveyor > > > On 4/14/07, *Stefan Steiniger* <[EMAIL PROTECTED] > <mailto:[EMAIL PROTECTED]>> wrote: > > > > Larry Becker schrieb: > > The best advice I can give on optimization is never do it until > you have > > working code. I have been working on JUMP for three years and > have only > > started looking at optimization the last month or so. > > > > See http://www.extremeprogramming.org/rules/optimize.html > > which does not only hold for optimization! > guess why i did not setup my pc again for 3 years, and only did now > because i got an ugly virus. > > if you have not at least one very strong reason (which is still strong > after you slept a night over), don't change "well running" systems. > > > > > When I said I didn't understand what problem you are trying to > solve, I > > wasn't talking about queues and such. I was asking (big picture) > what > > OpenJump deficiency are you trying to remedy? > > > > Larry > > > > On 4/13/07, *Sunburned Surveyor* <[EMAIL PROTECTED] > <mailto:[EMAIL PROTECTED]> > > <mailto: [EMAIL PROTECTED] > <mailto:[EMAIL PROTECTED]>>> wrote: > > > > Michael and Larry, > > > > Thank you for the responses. Please see my comments below. > > > > Michael wrote: "Did you have a look to java 5 documentation ? : > > you'll find interesting > > information in Queue interface and LinkedList implementation." > > > > Yes, I took a look at the Queue interface. It had the > > First-In-First-Out behavior, but I didn't see a way to limit the > > growth of the content, which I would need to do for my > purposes. If > > we decide to make the JUMP to a newer JDK version that supports > > generics I might take a look at this. > > > > Michael wrote: "I think there are also many open-source projects > > related to Cache > > management." > > > > Could you toss me a name or two? :] Remember that this > question was > > really about just the buffer, which is one part of the whole > > FeatureCache. > > > > Larry wrote: "Regarding specific suggestions, I'm afraid I > haven't > > yet understood exactly what problem you are trying to solve." > > > > I'm trying to find the most efficient and fast First-In-First-Out > > collection for in-memory representation of features. I was > > concerned the cost of object casting, since Java 1.4.2 doesn't > > support generics. Java 1.4.2 also does not contain a > collection that > > implements the "growth-to-a-limit" behavior that I need. > > > > I will visit the JDK Version topic in a new thread, because I > feel > > it is an important one. > > > > The Sunburned Surveyor > > > > > > On 4/13/07, *Larry Becker* < [EMAIL PROTECTED] > <mailto:[EMAIL PROTECTED]> > > <mailto: [EMAIL PROTECTED] > <mailto:[EMAIL PROTECTED]>>> wrote: > > > > Hi Sunburned, > > > > Michaël is correct. It is time to embrace the Java 5 > > enhancements. It may even be time to start considering > Java 6. > > My testing shows no problems with compatibility. > > > > Regarding specific suggestions, I'm afraid I haven't yet > > understood exactly what problem you are trying to solve. > > > > regards, > > Larry > > > > > > On 4/13/07, *Michaël Michaud* <[EMAIL PROTECTED] > <mailto:[EMAIL PROTECTED]> > > <mailto: [EMAIL PROTECTED] > <mailto:[EMAIL PROTECTED]>>> wrote: > > > > Hi, > > > > Did you have a look to java 5 documentation ? : > you'll find > > interesting > > information in Queue interface and LinkedList > implementation. > > I think there are also many open-source projects > related to > > Cache > > management. > > With java 5 generics cast is no more necessary. > > My advices : > > - read the javadoc first > > - use java 5 (this subject has not been discussed for > a long > > time, but > > my personnal feeling is that it is now time to use > java 5, > > specially for > > a new important project / feature) > > - do-it yourself is good to learn, but for general > problems and > > performance issues, existing libs is often a better > choice :-) > > > > My two cents > > > > Michaël > > > > > > Sunburned Surveyor a écrit : > > > > > I've been doing some more work on my FeatureCache > > implementation. I am > > > currently designing a "buffer" that will hold a > set number > > of features > > > from the feature cache in memory. This will increase > > performance when > > > a user is working with the same small group of > features. > > The maximum > > > number of features in the buffer will be set by > the user > > and can be > > > based on RAM of the computer running OpenJUMP and the > > user's need for > > > speed. (A default maximum feature count will be > provided.) > > > > > > I need some help from our more experienced Java > > developers. Larry > > > seems to have a nack for performance issues, so > perhaps he > > will have > > > some advice. Any suggestion are welocome. :] > > > > > > I'm trying to figure what type of > collection/container to > > use for the > > > buffer. I took a look at the existing Java Collection > > implementations, > > > and I don't see one that will work out of the box. > I need a > > > First-In-First-Out collection whose growth I can > limit. I > > think I have > > > three choices for the buffer's container: > > > > > > [1] Extend and modify an existing Collection > implementation. > > > [2] Write my own implementation of the Collection > > interface that > > > behaves the way I need it to. > > > [3] Write an implemenation that uses an array > internally, > > works > > > directly with objects that implement the Feature > > interface, but that > > > does not implement Collection. > > > > > > Option 1 is probably the easiest, but I don't think it > > will be the > > > most efficient or fast. Option #2 is great from a > reusability > > > standpoint, but it is a lot more work. I think > Option 3 > > will be the > > > fastest and most efficient, becuase I won't have > to make > > object casts, > > > but it will be more work than Option 1. > > > > > > How much speed will I gain if I avoid the Collection > > interface and the > > > resulting casts from Object to Feature? Do you think > > Option 2 will be > > > significantly faster? > > > > > > I think speed will be critical for this part of the > > FeatureCache > > > implementation. The only part more critical from a > speed > > point of view > > > will be the binary format reader/writer. > > > > > > Thanks, > > > > > > The Sunburned Surveyor > > > > > > > > > >------------------------------------------------------------------------ > > > > > > > > >------------------------------------------------------------------------- > > > > >Take Surveys. Earn Cash. 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