Stage 4 Quality Gate Report: Concurrency (v0.4.0)¶
Date: 2026-10-25
Branch: stages-2-7
Status: PASSED
Deliverables Checklist¶
- [x] 4.1 Parameters:
max_concurrency: int = 1,executor: Literal["thread", "process", "_inline"] = "thread", input validation (31cf9f0) - [x] 4.2 Coordinator loop: Single-writer coordinator with
ThreadPoolExecutor, deadline tracking,concurrent.futures.wait(FIRST_COMPLETED), abandoning timed-out threads (048d09a) - [x] 4.3 Process backend:
multiprocessing.get_context("spawn"), runner picklability check, child termination withSIGTERMandSIGKILLon timeout, pipe communication (b2c3300) - [x] 4.4 Determinism for tests: Internal
_inlineexecutor for synchronous execution with virtual clocks and fake sleep (fabd687) - [x] 4.5 Tests: Complete concurrency test suite (
7c4fb81): - Speedup and peak concurrency counter verification (independent tasks finish in parallel)
- Dependency order verification (dependent tasks never start early)
- Process backend kills hung tasks at timeout via
SIGTERM/SIGKILL - Runner picklability validation
- Deterministic inline execution with fake clock
- No
sqlite3.ProgrammingErrorunder high concurrency - Valid task event sequences (
pending->ready->running->succeeded) - 20-run stability verification (zero flakiness)
- [x] 4.6 Release: ADR 008, updated README & CHANGELOG, bump version to
0.4.0, tagstage-4-done
Architectural Decision Records (ADRs)¶
20x Stability Verification (Raw Output)¶
......... [100%]
9 passed in 1.04s
......... [100%]
9 passed in 1.03s
......... [100%]
9 passed in 1.02s
......... [100%]
9 passed in 1.19s
......... [100%]
9 passed in 1.20s
......... [100%]
9 passed in 1.18s
......... [100%]
9 passed in 1.01s
......... [100%]
9 passed in 1.01s
......... [100%]
9 passed in 1.05s
......... [100%]
9 passed in 1.16s
......... [100%]
9 passed in 1.18s
......... [100%]
9 passed in 1.10s
......... [100%]
9 passed in 1.00s
......... [100%]
9 passed in 1.00s
......... [100%]
9 passed in 1.00s
......... [100%]
9 passed in 1.19s
......... [100%]
9 passed in 1.21s
......... [100%]
9 passed in 1.00s
......... [100%]
9 passed in 1.02s
......... [100%]
9 passed in 1.02s
ALL 20 PASS
Quality Gate Execution Output¶
=== 1. Checking Ruff ===
All checks passed!
=== 2. Checking Mypy ===
Success: no issues found in 28 source files
=== 3. Running Pytest with Coverage ===
........................................................................ [ 77%]
..................... [100%]
================================ tests coverage ================================
_______________ coverage: platform linux, python 3.12.13-final-0 _______________
Name Stmts Miss Cover
-------------------------------------------------------------
src/orchestration_engine/__init__.py 12 2 83%
src/orchestration_engine/errors.py 4 0 100%
src/orchestration_engine/executor.py 34 4 88%
src/orchestration_engine/loader.py 55 2 96%
src/orchestration_engine/models.py 39 0 100%
src/orchestration_engine/persistence.py 66 5 92%
src/orchestration_engine/readiness.py 57 4 93%
src/orchestration_engine/runner.py 276 39 86%
src/orchestration_engine/scheduler.py 13 0 100%
src/orchestration_engine/status.py 35 1 97%
src/orchestration_engine/transitions.py 31 0 100%
src/orchestration_engine/validation.py 46 2 96%
-------------------------------------------------------------
TOTAL 668 59 91%
Required test coverage of 90% reached. Total coverage: 91.17%
93 passed in 5.00s
=== 4. Building Wheel ===
Building source distribution (uv build backend)...
Building wheel from source distribution (uv build backend)...
Successfully built dist/orchestration_engine-0.4.0.tar.gz
Successfully built dist/orchestration_engine-0.4.0-py3-none-any.whl
=== 5. Testing Fresh Venv Wheel Installation & Exports ===
All 20 exports successfully imported from wheel
=== 6. Running Examples Against Installed Wheel ===
Running examples/run_simple_workflow.py...
Running task: Fetch data (fetch-data)
Running task: Process data (process-data)
Workflow finished with status: succeeded
=== 7. Checking Clean Working Tree ===
=== Quality Gate Passed Successfully! ===