I don't understand what you need a lock for. You can go get the report, and then put it in the cache under the same key. You don't need to lock the key. Until the new report is ready, client will get the old one from the cache. Simply put the new value in the cache under the smae key name and it will replace the old value.
Aaron --- emily chen <[EMAIL PROTECTED]> wrote: > Hi Aaron, > > I got you. I will implement the lock in my web > application. > > Many thanks, > > Lucy > > Aaron Smuts <[EMAIL PROTECTED]> wrote: > Of course JCS is Thread safe, if you mean that it > can > handle multiple threads accessing the same regions > at > the same time. > > It doesn't work the way you described, but it is > thread safe. You won't get a corrupted value for a > key. > > As for the memory cache, it is a reference cache. It > returns references to objects in memory. It does not > clone the values. If you are manipulating objects > that are in the cache, any other Thread could get a > reference to that same object. . .. It is best to > clone objects that are retrieved from the cache > prior > to modifying them or just don't modify objects that > have been put in the cache. > > Aaron > > --- emily chen wrote: > > > Hi there, > > > > I want to use JCS for my web application, and have > > some thread safe question. > > > > Here is scenario: > > > > I have a JCS cache named > �ePINBatchReportCache�? > > which is used to save the ePIN Batch Report data. > > > > Thread 1: > > 1) Get report data from Cache for key. > > 2) If not data found in the cache, then lock > > the cache for that key. > > 3) Get report data from database. > > 4) Put the report data in cache for key > > 5) Release lock for that key. > > > > Thread 2: > > 1) Get the data from cache for key. > > 2) Wait for lock to be released (should have > > max wait time here). > > 3) Get the data from cache. > > > > Does JCS have the above functionality -- lock the > > key of cache? Or I have to put lock on the key in > > my web application source code? > > > > Thank for your help. > > > > Lucy > > > > > > --------------------------------- > > Yahoo! Messenger with Voice. Make PC-to-Phone > Calls > > to the US (and 30+ countries) for 2�?min or less. > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: > [EMAIL PROTECTED] > For additional commands, e-mail: > [EMAIL PROTECTED] > > > > > --------------------------------- > Yahoo! Messenger with Voice. PC-to-Phone calls for > ridiculously low rates. --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
