dcapwell commented on code in PR #136:
URL: https://github.com/apache/cassandra-accord/pull/136#discussion_r1833501764
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accord-core/src/main/java/accord/impl/AbstractConfigurationService.java:
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@@ -45,15 +48,16 @@ public abstract class
AbstractConfigurationService<EpochState extends AbstractCo
protected final EpochHistory epochs = createEpochHistory();
- protected final List<Listener> listeners = new ArrayList<>();
+ protected final List<Listener> listeners = new CopyOnWriteArrayList<>();
Review Comment:
there are now 2 different types of locking in this class: `listeners` that
use the copy-on-write, and `epochs` which does sync on the class.
One of the reasons to make this `CopyOnWrite` is that its accessed by
different threads (register, caller) and this is a simple way to make sure its
safe without needing this class to manage the locks for it (before we did class
level sync)
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