tree 90014c6e19886063749221ad6ddb9b74ec8232b8
parent d0840ac223cbd9bd4502af27bd0a183d2306cc77
author Martin Fick <mfick@codeaurora.org> 1487199955 -0700
committer Martin Fick <mogulguy10@gmail.com> 1506782586 +0000

Add a filesystem based persistent events store

This event store is currently very simplistic, and it is only safe to
use from a single node (not multi-master safe) at a time.  It relies on
java synchronized methods for synchronization which only works within
the same process.

The file system layout of this store is fairly simple, it uses
individual files to store the uuid, head, tail, and each event.  The
events are sharded in an extensible way that can scale to the full size
of a java long, with at most 1000 entries per directory.  It is
envisioned that a similar layout will eventually be used with additional
directories for transactions in a multi-master safe way.

Change-Id: I73e3a74ddce10ebf956e473d4bce7119c42d79a7