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[ECO-5658] Switch to using ably-swift's EventEmitter#130

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lawrence-forooghian wants to merge 3 commits into
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2nd-attempt-fix-swift-liveobjects-subscriptions
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[ECO-5658] Switch to using ably-swift's EventEmitter#130
lawrence-forooghian wants to merge 3 commits into
mainfrom
2nd-attempt-fix-swift-liveobjects-subscriptions

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@lawrence-forooghian
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Removes the complicated updateSelfLater mutable state pattern and just wraps a EventEmitter class instead. No public API changes.

Resolves #102.

lawrence-forooghian and others added 3 commits February 20, 2026 16:25
Copy EventEmitter.swift, InternalEventEmitter.swift,
DefaultInternalEventEmitter.swift and its tests from ably-swift
commit 98996f1, making the EventEmitter protocol internal.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
The liveobjects plugin uses DispatchQueue-based concurrency, not
@mainactor. Adapt the EventEmitter (copied from ably-swift) to
match:

- Remove @mainactor from all protocols and classes
- Add Sendable conformance throughout
- Store mutable state in DispatchQueueMutex
- Prefix all methods with nosync_ (must be called on internal queue)
- Rename typealiases: MainActorEventListener → EventListener,
  MainActorNamedEventListener → NamedEventListener (now @sendable)
- SubscriptionController takes internalQueue in init, uses
  DispatchQueueMutex for its registrations
- DefaultInternalEventEmitter snapshots listeners inside withoutSync,
  calls them outside to avoid exclusivity violations on re-entry
- Update tests to use ably_syncNoDeadlock and nosync_ methods

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
SubscriptionStorage was a struct that manually managed subscription
bookkeeping. Because it was a value type, unsubscription required a
verbose updateSelfLater closure-threading pattern at every call site.

Replace it with a class wrapping DefaultInternalEventEmitter. A
private EmitData struct bundles the update with the dispatch queue so
nosync_emit can still accept a queue parameter. Each
nosync_subscribe creates a SubscriptionController whose signal is
passed to the emitter; the returned SubscribeResponse captures the
controller and synchronously dispatches nosync_off() on unsubscribe.

Because SubscriptionStorage is now a reference type, the
updateSelfLater closures throughout LiveObjectMutableState,
InternalDefaultLiveCounter, InternalDefaultLiveMap, and
InternalDefaultRealtimeObjects are no longer needed and are removed.
The subscription/emit methods on LiveObjectMutableState drop their
mutating qualifier and gain a nosync_ prefix for consistency.

TODO: Lawrence check that this resolves #102
TODO: There's still a mention of updateSelfLater

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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@lawrence-forooghian
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Replaced by #131.

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Switch to something simpler for subscription storage

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