Implement CHA-RL5a1 #147
Implement CHA-RL5a1 #147
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This spec point requires us to implement a special behaviour to handle the fact that multiple contributors can share a channel. I have decided, instead, to make it so that each channel has precisely one lifecycle contributor. I think this is a simpler, functionally equivalent approach and have suggested it in [1]. [1] ably/specification#240
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Actionable comments posted: 3
🧹 Outside diff range and nitpick comments (3)
Tests/AblyChatTests/DefaultRoomTests.swift (1)
67-67: LGTM! Consider enhancing the documentation.The spec point documentation clearly explains the implementation choice and provides a reference to the relevant discussion. To make it even more helpful for future maintainers, consider adding a brief explanation of why this approach is simpler/better than allowing multiple contributors to share a channel.
Sources/AblyChat/Room.swift (2)
73-73: Consider renamingchannelstofeatureChannelsfor clarityThe
channelsproperty holds the list of channels associated with room features. Renaming it tofeatureChannelsmay enhance code readability by making its purpose more explicit.
206-209: Enforce CHA-RC2e ordering offeaturesWithOptionsThe function
createFeatureChannelPartialDependenciesrelies onfeaturesWithOptionsbeing in CHA-RC2e order. To prevent potential misuse, consider adding a precondition or assertion to enforce this ordering, or document the requirement more prominently.
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📒 Files selected for processing (2)
Sources/AblyChat/Room.swift(6 hunks)Tests/AblyChatTests/DefaultRoomTests.swift(2 hunks)
🔇 Additional comments (3)
Tests/AblyChatTests/DefaultRoomTests.swift (2)
87-90: LGTM! Clear and precise test documentation.
The updated test documentation effectively explains the lifecycle manager initialization process and the feature assignment logic. This helps future maintainers understand the test's expectations and the implementation details.
90-92: LGTM! Consider adding additional test cases.
The test expectations correctly validate the new implementation approach where messages and presence share a channel. To strengthen the test coverage, consider adding test cases that verify:
- The behavior when attempting to create multiple contributors for the same channel
- The order of feature assignment when multiple features share a channel
Let's verify if there are any other test files that might need similar updates:
✅ Verification successful
Test coverage is sufficient, no additional test cases needed
The codebase already has comprehensive test coverage for channel sharing and feature assignment:
- The implementation explicitly follows spec point CHA-RL5a1, which prevents multiple contributors from sharing a channel
- The current test validates the core functionality where messages and presence share a channel
DefaultRoomLifecycleManagerTests.swiftcontains detailed tests for contributor management and channel detachment behavior- The comment in the test file clearly documents the design decision and links to the relevant specification discussion
🏁 Scripts executed
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rg "RoomFeature.*\[.*\].*messages.*reactions" -A 5 --type swift Tests/AblyChatTests/
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Sources/AblyChat/Room.swift (1)
305-305: Channel release logic conforms to specification
The channels are correctly released in the release method, adhering to CHA-RL3h. This ensures resources are properly cleaned up.
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Actionable comments posted: 0
🧹 Outside diff range and nitpick comments (1)
Tests/AblyChatTests/DefaultRoomTests.swift (1)
87-90: LGTM! Consider adding explicit channel-feature mapping assertionsThe test documentation and implementation effectively verify the new single-contributor-per-channel approach. The assertions properly check both the number of contributors and channel fetching.
Consider adding explicit assertions to verify the channel-feature mapping, for example:
#expect(Set(lifecycleManagerCreationArguments.contributors.map(\.feature)) == Set(expectedFeatures)) +// Verify specific channel-feature mappings +let messageContributor = try #require(lifecycleManagerCreationArguments.contributors.first { $0.feature == .messages }) +#expect(messageContributor.channel.name == "basketball::$chat::$chatMessages") +let reactionContributor = try #require(lifecycleManagerCreationArguments.contributors.first { $0.feature == .reactions }) +#expect(reactionContributor.channel.name == "basketball::$chat::$reactions")
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📒 Files selected for processing (2)
Sources/AblyChat/Room.swift(6 hunks)Tests/AblyChatTests/DefaultRoomTests.swift(2 hunks)
🚧 Files skipped from review as they are similar to previous changes (1)
- Sources/AblyChat/Room.swift
🔇 Additional comments (2)
Tests/AblyChatTests/DefaultRoomTests.swift (2)
Line range hint 90-101: LGTM! Well-integrated with existing test suite
The test case maintains consistency with the existing test patterns and effectively complements the existing test coverage. The assertions are clear and follow the established conventions.
67-67: Verify the alternative implementation approach
The comment clearly documents the alternative approach to implementing CHA-RL5a1. While this approach (preventing multiple contributors from sharing a channel) differs from the original spec, it appears to be a simpler solution.
Let's verify the discussion about this approach:
✅ Verification successful
Alternative implementation approach is well-documented and actively discussed
The implementation approach is verified through the GitHub issue #240. The issue provides clear context about why not allowing multiple contributors to share a channel is being considered as a simpler alternative:
- It addresses ambiguity in CHA-RL4a2 regarding attachment state tracking
- It simplifies the implementation by avoiding complex channel sharing scenarios
- It aligns with recent changes (issue #233) where rooms already handle unique channel fetching
The deviation from the original spec is being properly discussed through the specification repository's issue tracker, demonstrating good engineering practice in proposing and documenting alternative approaches.
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# Description: Check the GitHub issue discussing the alternative approach
gh issue view 240 --repo ably/specification
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This spec point requires us to implement a special behaviour to handle the fact that multiple contributors can share a channel. I have decided, instead, to make it so that each channel has precisely one lifecycle contributor. I think this is a simpler, functionally equivalent approach and have suggested it in ably/specification#240.
Summary by CodeRabbit
New Features
Bug Fixes
Documentation