Hello,
First, thanks for putting this great project out.
I have a question regarding transaction behavior when creating new nodes. I'm
trying to figure out how to atomically create a node and update it within a
single transaction. Using a REPEATABLE_READ transaction level, the assertion
on line 8 below fails if node "/a/b" does not exist - is this expected?
The behavior I was expecting is that one of the transactions would throw an
exception on commit, such that only one transaction modified the node. If node
"/a/b/" exists at the start, then thread 2 will get an exception trying to
upgrade the read lock on line 6.
| T1 T2
| 1 tx1.begin()
| 2 tx2.begin()
| 3 get("/a/b", "foo") get("/a/b", "foo")
| 4 put("/a/b", "foo", "bar")
| 5 tx1.commit()
| 6 put("/a/b", "foo", "qux")
| 7 tx2.commit()
|
| 8 assertEquals("bar", get("/a/b", "foo"))
|
Thanks,
--
dave
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