Hi Phil... Do you suggest to start a commons-concurrent as a commons sandbox project ?
On Sun, Sep 6, 2009 at 10:03 PM, Phil Steitz<phil.ste...@gmail.com> wrote: > Oliver Heger wrote: >> AIUI the mission of commons-lang is to provide extensions and >> improvements for existing Java API classes. The concurrent package in >> Java 5 is a great step forward in supporting multi-threaded programming >> in Java, nevertheless there is certainly still room for improvements. >> The proposed concurrent utilities for lang are not intended to reinvent >> the wheel, but to implement additional and convenience functionality on >> top of the existing API. > +1 >> >> @Ted: The proposed class is not high-sophisticated, but given the >> additional timing aspect it is not trivial either. Of course, it can be >> implemented using standard Java means (that's what I did), but having >> something that works out of the box is surely preferable than having to >> create your own implementation. This is the purpose of a library, isn't it? > > Agree on characterization of [lang]. I wonder though whether what > you have in mind might quickly grow to be too large for [lang]. How > about starting in the sandbox (once you have the grant) so we have > something concrete to talk about? Looks useful and interesting to me. > > Phil > > >> >> Oliver >> >> Ted Dunning schrieb: >>> In particular, why can this not be implemented using the Java 5 >>> primitives? >>> >>> For instance, a thread could be created that adds tokens at a fixed >>> rate to >>> a blocking queue up to a small maximum. Threads wishing to consume >>> the load >>> bounded resource would request a token before sending a query. This >>> would >>> enforce a maximum use rate. >>> >>> I could imagine a similar use of a semaphore as well. >>> >>> On Sat, Sep 5, 2009 at 3:03 PM, Mohammad Nour El-Din < >>> nour.moham...@gmail.com> wrote: >>> >>>> Sorry for the question, but why we need a new *concurrent* utils in >>>> commons-lang while we have the concurrent package in Java SE 5 ? >>>> >>>> On Sat, Sep 5, 2009 at 9:48 PM, Oliver >>>> Heger<oliver.he...@oliver-heger.de> wrote: >>>>> In my day job I have written a synchronization primitive that may be of >>>>> interest for the proposed concurrent package of the new version of >>>>> commons-lang. I first want to check whether there is interest in this >>>> stuff, >>>>> then I can talk to my employer about the code donation (which hopefully >>>>> should not be a problem). >>>>> >>>>> Now to the synchronization primitive: It is a class called >>>>> "LoadBarrier" >>>>> that is somewhat similar to a semaphor in that it allows a configurable >>>>> number of locks to be hold. But there is also a timing aspect: The >>>>> limit >>>> of >>>>> locks is enforced in a configurable time unit. If a thread requests >>>> another >>>>> lock when the maximum number of locks is already reached, it gets >>>>> blocked >>>>> until the time unit is over. After that all blocked threads are >>>>> freed and >>>>> can again try to aquire a lock. >>>>> >>>>> The background of this class is that it provides an easy way of >>>> controlling >>>>> the load produced by a process or enforcing a threashold. In our use >>>>> case >>>> we >>>>> had a background process running queries on a database for statistical >>>>> evaluations. To ensure that the database load does not affect the >>>>> system >>>> a >>>>> LoadBarrier was used that enforced a limit of database queries per >>>> second. >>>>> WDYT? If there is interest, I am going to address my employer and then >>>>> create a JIRA enhancement ticket. >>>>> >>>>> Oliver >>>>> >>>>> --------------------------------------------------------------------- >>>>> To unsubscribe, e-mail: dev-unsubscr...@commons.apache.org >>>>> For additional commands, e-mail: dev-h...@commons.apache.org >>>>> >>>>> >>>> >>>> >>>> -- >>>> Thanks >>>> - Mohammad Nour >>>> - LinkedIn: http://www.linkedin.com/in/mnour >>>> ---- >>>> "Life is like riding a bicycle. To keep your balance you must keep >>>> moving" >>>> - Albert Einstein >>>> >>>> --------------------------------------------------------------------- >>>> To unsubscribe, e-mail: dev-unsubscr...@commons.apache.org >>>> For additional commands, e-mail: dev-h...@commons.apache.org >>>> >>>> >>> >>> >> >> >> --------------------------------------------------------------------- >> To unsubscribe, e-mail: dev-unsubscr...@commons.apache.org >> For additional commands, e-mail: dev-h...@commons.apache.org >> > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: dev-unsubscr...@commons.apache.org > For additional commands, e-mail: dev-h...@commons.apache.org > > -- Thanks - Mohammad Nour - LinkedIn: http://www.linkedin.com/in/mnour ---- "Life is like riding a bicycle. To keep your balance you must keep moving" - Albert Einstein --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@commons.apache.org For additional commands, e-mail: dev-h...@commons.apache.org
