rocicorp / repc

The canonical Replicache client, implemented in Rust.
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For discussion - deloop dispatch #192

Closed aboodman closed 4 years ago

aboodman commented 4 years ago

This PR doesn't work but shows my train of thought.

We change dispatch into a "normal" function that delegates directly to the "doer" functions. I already tested (see do_test) that the basic concept works -- the futures get executed and calls can overlap this way.

However, I rediscovered why we need the dispatch loop!

It's fundamentally because of the relationship between transactions and stores. Transactions have a reference to their store, so the store must outlive the transaction. In particular the RWLockGuard in kv::{Read,Write}Transaction.

My thought was that the RWLock would let us get around this, but it does not. What it weakens is the single writer requirement. The reference requirement remains.