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Storage.store calls can be pipelined when implementation can take advantage of
it (as Zeo does). This allows reducing the impact of (network-induced, mainly)
latency by sending all objects to storages without waiting for storage answer.

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Those "properties" were put in _threads_dict (cf __setattr__), but only for
the thread who instantiates ThreadContext (until next "clear" call from/for
that thread, where they are not inserted in cleared version).

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This causes isolation problems in tests (and was detected because of this)
but would have also caused problem if multiple Storage (and hence App class)
instances were used in a single process.

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Reorganize unimplemented methods, gather all at end of file.

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If ZODBTests is imported at module level, TestLoader handle it and find
dupliucates test cases.

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It is important that unregistering a response from dispatcher and putting
it in its queue are atomic at dispatcher level to support askStoreObject
pipelining.

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This fixes problems uncovered by current work on askStoreObject pipelining.

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This ensure the cluster is stop and will not alter next rounds.
Use -1 to indicate a failure instead of 0.

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Also, avoid using local variables when they are used just once.

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Same for local_var.tid.

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If the value evaluates to False, don't update preindex.
If the value is a string, update preindex entry for given oid.
Otherwise, iterate over it, it must contain (oid, serial) tuples.

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This increases performance noticeably - especially since it was enabled on
connection, where properties change very often (such as data buffers).

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This prepares support for asynchronous store.

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