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feat(Flag Dependency): Evaluate flags that depend on other flags - #240

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emyller merged 6 commits into
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linear/sdk-4-enable-flag-dependency-in-the-java-server-side-sdk-0bd0
Oct 29, 2026
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feat(Flag Dependency): Evaluate flags that depend on other flags#240
emyller merged 6 commits into
mainfrom
linear/sdk-4-enable-flag-dependency-in-the-java-server-side-sdk-0bd0

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@linear-code

@linear-code linear-code Bot commented Oct 21, 2026 •
edited by emyller
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With local evaluation, the Java SDK can now serve a segment override that depends on another flag, the same way flagsmith-engine does for the Edge API. Until now, a condition such as $.flags.<feature>.enabled never matched in the Java SDK, so those overrides were silently skipped.

Changes

  • Flag dependency is now supported.
  • engine-test-data bumped to v3.11.0, the first release with flag dependency cases. All 219 cases pass.

Contributes to SDK-4

Closes #224

Review effort: 3/5

@linear-code
feat(Flag Dependency): Evaluate flags that depend on other flags
f2c1ef0 
Port flagsmith-engine's flag dependency support: segment conditions on
`$.flags.<feature>.enabled`, `.value` and `.variant` read the evaluated
result of another flag, resolved lazily and transitively. Flags caught in
a dependency cycle are served with reason `ERROR; code=CIRCULAR_DEPENDENCY`,
and client-supplied `$.flags` are ignored.

Flag results now carry the selected multivariate `variant`, and engine-test-data
is bumped to v3.11.0, the first release with flag dependency cases.

Generated with [Linear](https://linear.app/flagsmith/agent-session/5657b1da-28c2-4081-a075-cae660cc325b)

Co-authored-by: linear-code[bot] <222613912+linear-code[bot]@users.noreply.github.com>
@linear-code
linear-code Bot requested a review from a team as a code owner October 21, 2026 17:35
@linear-code
linear-code Bot requested review from emyller and removed request for a team October 21, 2026 17:35
@matthewelwell Linear Code

matthewelwell commented Oct 21, 2026

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Why are there no unit tests in this PR?

@emyller @linear-code
perf(Flag Dependency): Read $.flags conditions without serialising …
edf50a0 
…the context

Generated with [Linear](https://linear.app/flagsmith/agent-session/5657b1da-28c2-4081-a075-cae660cc325b)

Co-authored-by: linear-code[bot] <222613912+linear-code[bot]@users.noreply.github.com>
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@emyller @claude
Merge remote-tracking branch 'github/main' into linear/sdk-4-enable-f…
6ff8b45 
…lag-dependency-in-the-java-server-side-sdk-0bd0

Co-Authored-By: Claude Opus 5.5 (1M context) <[email protected]>
@codspeed

codspeed Bot commented Oct 28, 2026 •
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Merging this PR will improve performance by 18.62%

⚡ 10 improved benchmarks
❌ 1 (👁 1) regressed benchmark
✅ 4 untouched benchmarks

Performance Changes

Benchmark BASE HEAD Efficiency
⚡ getIdentityFlagsWithTraits[small] 2.5 ms 1.7 ms +44.22%
⚡ getIdentitySegmentsWithTraits[small] 2.5 ms 1.7 ms +42.54%
⚡ getIdentityFlagsWithIdentityOverrides[small] 2.2 ms 1.6 ms +36.52%
⚡ getIdentityFlagsNoTraits[small] 2.1 ms 1.6 ms +34.12%
⚡ getIdentityFlagsWithTraits[medium] 43.3 ms 34.3 ms +26.17%
⚡ getIdentityFlagsWithIdentityOverrides[medium] 42.2 ms 33.7 ms +25.24%
⚡ getIdentitySegmentsWithTraits[medium] 43.3 ms 34.7 ms +24.96%
⚡ getIdentityFlagsNoTraits[medium] 41.7 ms 33.6 ms +24.04%
⚡ getIdentitySegmentsWithTraits[large] 2.5 s 2.3 s +11.25%
⚡ getIdentityFlagsWithIdentityOverrides[large] 2.6 s 2.3 s +10.52%
👁 getEnvironmentFlags[small] 9.6 µs 16.7 µs -42.3%

Tip

Curious why performance improved? Comment @codspeedbot explain why performance improved on this PR, or directly use the CodSpeed MCP with your agent.

Comparing linear/sdk-4-enable-flag-dependency-in-the-java-server-side-sdk-0bd0 (c19fa07) with main (3e778a5)

Open in CodSpeed

@emyller

emyller commented Oct 28, 2026 •
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Why are there no unit tests in this PR?

I think we rely on engine test data containing flag dependency test cases, and the new sdk-spec which is added with new flag dependency test cases.

@emyller
emyller merged commit 7f7f7ee into main Oct 29, 2026
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@emyller
emyller deleted the linear/sdk-4-enable-flag-dependency-in-the-java-server-side-sdk-0bd0 branch October 29, 2026 20:38
@flagsmithdev flagsmithdev mentioned this pull request Oct 28, 2026
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@khvn26 khvn26 khvn26 approved these changes
@emyller emyller Awaiting requested review from emyller emyller is a code owner automatically assigned from Flagsmith/flagsmith-back-end

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Support $.flags context values in segment conditions

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@matthewelwell @emyller @khvn26