[jboss-user] [JBossCache] - Re: Write lock is not released

[vitamin-c]

"manik.surtani at jboss.com" wrote : 
  | It looks like the current WL holder and the RL requestor are not the same: 
  | 
  |   | ... could not be acquired by <zzz:4256>:162303 ...
  |   | 
  | and
  | 
  |   | ... Write lock owner: Thread[ReportDataTaskRunner-20521017-1,5,jboss] ...
  |   | 
  | 
Is it OK that RL requestor thread uses a GlobalTransaction, whereas WL owner thread doesn't?

Here's the code, where a GlobalTransaction is assigned to a thread requesting a lock (either RL or WL):

  | package org.jboss.cache.interceptors;
  | ...
  | public class LockInterceptor extends Interceptor {
  | ...
  |    public Object invoke(MethodCall m) throws Throwable {
  | ...
  |       GlobalTransaction gtx=null;
  | ...
  |       if(tx_mgr != null && (tx=tx_mgr.getTransaction()) != null && isValid(tx)) { // ACTIVE or PREPARING
  |          if(!transactions.contains(tx)) {
  |             gtx=cache.getCurrentTransaction(tx);
  |             if(gtx == null)
  |                throw new Exception("failed to get global transaction");
  | ...
  |          else {
  |             gtx=cache.getTransactionTable().get(tx);
  |          }
  | ...
  | 
Assuming that transaction manager presents, it is still unclear will a thread receive a non-null gtx, since cache.getTransactionTable().get(tx) doesn't check for null return value. According to metastaz's observations a thread may or may not receive a gtx, which looks like a bug, doesn't it?

Thanks,
Alexey

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