2007/4/19, Peter Schröder <[EMAIL PROTECTED]>:
hi, i am currently investigating the use of cayennes cross jvm caching with jgroups, shown here http://cayenne.apache.org/doc12/object-caching.html and here http://cayenne.apache.org/doc12/configuring-caching-behavior.html my question is, if it is possible to implement a cross-jvm counter, that wont be bitten by concurrency issues. f.e.: synchronized incrementCount(){ myObject.setCount(myObject.getCount() + 1) } if properly used, this would be sufficent in a single jvm to avoid issues. can i achieve something like that within level-3-caching?
for concurrent issues , I highly suggest using the java.util.concurrent or (the old package from doug lea if JDK < 1.5) , it provides many high level abstractions ( Barrier,Mutex ...) ... another way for resolving your problem could be to put in place a JVM clustering tier with OpenTerracota...Don't know if someone ever tried with Cayenne..I should bring transparent cross JVM caching... HTH Jerome -- Jerome Moliere - Mentor/J http://romjethoughts.blogspot.com/ auteur Eyrolles
