Yup - if you are adding an 'active' list to a new pipeline, then you need to honor locking semantecs. During list setup, the calls should be read-only (there may be exceptions to this, but I can't think of any). So grab a read lock on the list that you are building the pipeline against, build the pipeline, then drop the lock.
The write lock will block the read lock (or vice-versa) and you should be in business.
- K
----------------------- Original Message -----------------------
From: "Danilo Tuler" <
tuler@...>
To:
users@...
Cc:
Date: Thu, 29 May 2008 20:12:31 -0300
Subject: Need lock while building pipeline?
Hi guys,
I'm getting this exception while buildind a GL pipeline.
I think the problem is related to a lack of lock, because I think the
list is being populated (with the apropriate writeLock) while the
pipeline is being constructed.
Do I need to acquire a lock in this situation? Read or write?
java.lang.NullPointerException
at ca.odell.glazedlists.impl.adt.barcode2.SimpleTree.get(SimpleTree.java:151)
at ca.odell.glazedlists.SortedList.getSourceIndex(SortedList.java:372)
at ca.odell.glazedlists.TransformedList.get(TransformedList.java:103)
at ca.odell.glazedlists.impl.Grouper.groupTogether(Grouper.java:282)
at ca.odell.glazedlists.impl.Grouper.setComparator(Grouper.java:79)
at ca.odell.glazedlists.impl.Grouper.<init>(Grouper.java:64)
at ca.odell.glazedlists.UniqueList.<init>(UniqueList.java:93)
at ca.odell.glazedlists.UniqueList.<init>(UniqueList.java:67)
at br.com.investtools.trader.ui.filter.transaction.TransactionBrokerFilter.<init>(TransactionBrokerFilter.java:77)
Thanks,
Danilo
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