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Use PostgreSQL's NOTIFY/LISTEN for event pub/sub #100

Merged
merged 8 commits into from
Jan 21, 2018
Merged

Use PostgreSQL's NOTIFY/LISTEN for event pub/sub #100

merged 8 commits into from
Jan 21, 2018

Commits on Jan 15, 2018

  1. Use PostgreSQL's NOTIFY/LISTEN for event pub/sub 

    Using PostgreSQL for pub/sub removes need for EventStore to form a cluster of nodes. It can be used on a single node, or multiple nodes, but they don't need to be directly connected. Instead the database will be used to distribute events. This simplifies running EventStore on a cluster.
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    slashdotdash committed Jan 15, 2018
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  2. Use PG2 as distributed pub/sub 

    Listener module is now a cluster singleton so only one PostgreSQL `LISTEN` connection is used per event store cluster.
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  3. Use Elixir's GenStage to broadcast persisted events

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  4. [Test] Subscribe to all stream and single stream 

    Create PostgreSQL connection for notify test.
Allow short delay for distributed subscription tests.
Increase assert receive and refute timeouts in `distributed` env.
Use latest Elixir and Erlang versions in Travis CI config.
Use default logger format in test envs.
Additional subscription logging to help identify intermittent test failure in `:distributed` env.
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  5. [Doc] Cluster and PostgreSQL LISTEN / NOTIFY usage 

    Include #100 in CHANGELOG
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    slashdotdash committed Jan 15, 2018
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  6. Migration script for next release

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    slashdotdash committed Jan 15, 2018
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  7. Log subscription process activity

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  8. Use on_exit callback to stop :eventstore app in tests

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