Create db.lock file only for persistent databases
#3912
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This is the first step to make in-memory only databases not touch the disk at all. Pending is an in-memory only sink for module logs. Responsibility for the lock file is transferred to `Durability`, which means that only persistent databases opened for writing acquire the lock. As a consequence, the `Durability` trait gains a `close` method that prevents further writes and drains the internal buffers, even when multiple `Arc`-pointers to the `Durability` exist.
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This is the first step to make in-memory only databases not touch the disk at all. Pending is an in-memory only sink for module logs.
Responsibility for the lock file is transferred to
Durability, which means that only persistent databases opened for writing acquire the lock.As a consequence, the
Durabilitytrait gains aclosemethod that prevents further writes and drains the internal buffers, even when multipleArc-pointers to theDurabilityexist.Expected complexity level and risk
2
Testing
Covered by existing tests.