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Refactor: remove isAvailable(), make build() return Skill<*>?#415

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Stypox merged 9 commits into
DicioTeam:mainfrom
mretallack:refactor/remove-isAvailable-race-condition
May 13, 2026
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Refactor: remove isAvailable(), make build() return Skill<*>?#415
Stypox merged 9 commits into
DicioTeam:mainfrom
mretallack:refactor/remove-isAvailable-race-condition

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Eliminates the race condition where a skill could be deemed available under one locale but then built/executed under a different locale after a language change.

By merging the availability check into build() and returning null when the skill cannot be constructed, there is no longer a window between checking availability and building the skill where state can change.

  • Remove SkillInfo.isAvailable() abstract method
  • Change SkillInfo.build() return type from Skill<> to Skill<>?
  • Update all 15 SkillInfo implementations to return null if unavailable
  • Update SkillHandler to use mapNotNull for building skills
  • Update SkillSettingsScreen to use build() != null
  • Update test mocks and preview providers

Addresses the root cause of the NPE in #412 at the architecture level.

Eliminates the race condition where a skill could be deemed available
under one locale but then built/executed under a different locale after
a language change.

By merging the availability check into build() and returning null when
the skill cannot be constructed, there is no longer a window between
checking availability and building the skill where state can change.

- Remove SkillInfo.isAvailable() abstract method
- Change SkillInfo.build() return type from Skill<*> to Skill<*>?
- Update all 15 SkillInfo implementations to return null if unavailable
- Update SkillHandler to use mapNotNull for building skills
- Update SkillSettingsScreen to use build() != null
- Update test mocks and preview providers

Addresses the root cause of the NPE in DicioTeam#412 at the architecture level.
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Thank you! I left some minor comments

Comment thread app/src/main/kotlin/org/stypox/dicio/eval/SkillHandler.kt Outdated
Comment thread app/src/main/kotlin/org/stypox/dicio/eval/SkillHandler.kt Outdated
Comment thread app/src/main/kotlin/org/stypox/dicio/eval/SkillHandler.kt Outdated
Comment thread app/src/main/kotlin/org/stypox/dicio/eval/SkillHandler.kt Outdated
Comment thread app/src/main/kotlin/org/stypox/dicio/skills/calculator/CalculatorInfo.kt Outdated
Comment thread app/src/main/kotlin/org/stypox/dicio/skills/flashlight/FlashlightInfo.kt Outdated
Comment thread app/src/main/kotlin/org/stypox/dicio/skills/joke/JokeSkill.kt Outdated
mretallack and others added 5 commits May 12, 2026 21:37
- Remove buildSkillFromInfo helper, inline fallback build
- CalculatorSkill: accept operators as constructor param, no runtime !!
- JokeSkill: accept resolved locale as constructor param, no runtime !!
- TelephoneInfo/TimerInfo: use ?: return null pattern, no !!
- FlashlightInfo: remove @SuppressLint("NewApi")
- SkillSettingsScreen: source availability from enabledSkillsInfo via
  view model instead of calling build() in composable
enabledSkillsInfo only contains skills that are enabled AND available.
A skill disabled by the user would incorrectly appear as unavailable
(greyed out). Now disabled skills are assumed available since we cannot
determine availability without building them.
Comment thread app/src/main/kotlin/org/stypox/dicio/settings/SkillSettingsScreen.kt Outdated
@mretallack
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Thank you! I left some minor comments

@Stypox thanks, new commits pushed, if you want to have a quick look to see its the right direction.

@mretallack mretallack marked this pull request as ready for review May 13, 2026 05:14
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Thanks for addressing the comments!

Comment thread app/src/main/kotlin/org/stypox/dicio/skills/telephone/TelephoneInfo.kt Outdated
Comment thread app/src/main/kotlin/org/stypox/dicio/skills/flashlight/FlashlightInfo.kt Outdated

val skills: List<SkillInfo> get() = skillHandler.allSkillInfoList

val enabledSkillsInfo = skillHandler.enabledSkillsInfo
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(this would have had to be a getter just like skills, or it will cache skillHandler.enabledSkillsInfo instead of always getting the latest one)

Comment thread app/src/main/kotlin/org/stypox/dicio/settings/SkillSettingsScreen.kt Outdated
FlashlightSkill uses API 23+ camera APIs. The annotation is needed
since minSdk is 21, but the call is guarded by the FEATURE_CAMERA_FLASH
check which ensures the code only runs on capable devices.
…ettings screen

- TelephoneSkill/TimerSkill: accept yesNoData as constructor param,
  pass through to ConfirmCallOutput/ConfirmCancel to eliminate runtime !!
- SkillSettingsScreen: revert to build() != null for availability check
  with comment noting potential performance concern
- Remove enabledSkillsInfo from ViewModel (no longer needed)
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LGTM, thank you!

(btw, when you pull in changes from main, I'd prefer if you rebase instead of creating a merge commit to keep the history clean; this is very minor so no worries)

@Stypox Stypox merged commit 18c96f1 into DicioTeam:main May 13, 2026
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2 participants