49 lines
3.7 KiB
Markdown
49 lines
3.7 KiB
Markdown
# Plugin Host with Assembly Isolation
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## Module
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Plugin
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## Status
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VERIFIED
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## Description
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Plugin host with assembly-based loading, isolated AssemblyLoadContext, and configurable host options.
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## Implementation Details
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- **PluginHost**: `src/Plugin/StellaOps.Plugin.Host/PluginHost.cs` -- central coordinator implementing IPluginHost + IAsyncDisposable; manages discovery -> dependency validation -> load order -> assembly loading -> initialization -> health monitoring lifecycle; ConcurrentDictionary<string, LoadedPlugin> registry; events for state changes and health changes; auto-recovery of unhealthy plugins via reload; configurable initialization/shutdown timeouts
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- **PluginAssemblyLoadContext**: `src/Plugin/StellaOps.Plugin.Host/Loading/PluginAssemblyLoadContext.cs` -- collectible AssemblyLoadContext for plugin isolation; uses AssemblyDependencyResolver for plugin-local dependency resolution; WeakReference for GC tracking; supports unmanaged DLL loading; PluginLoadContextReference wrapper with IsCollected/Unload
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- **AssemblyPluginLoader**: `src/Plugin/StellaOps.Plugin.Host/Loading/AssemblyPluginLoader.cs` -- IHostPluginLoader implementation for assembly-based loading
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- **PluginHostOptions**: `src/Plugin/StellaOps.Plugin.Host/PluginHostOptions.cs` -- configures PluginPaths, BuiltInPluginIds, TrustedPluginIds, TrustedVendors, FailOnPluginLoadError, AutoRecoverUnhealthyPlugins, InitializationTimeout, ShutdownTimeout
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- **IPluginHost**: `src/Plugin/StellaOps.Plugin.Host/IPluginHost.cs` -- interface: StartAsync, StopAsync, LoadPluginAsync, UnloadPluginAsync, ReloadPluginAsync, GetPluginsWithCapability<T>, GetPlugin, GetCapability<T>
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- **Source**: Feature matrix scan
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## E2E Test Plan
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- [x] Verify plugin host loads plugins in dependency order and transitions through lifecycle states
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- [x] Test assembly isolation prevents plugin assemblies from conflicting with host assemblies
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- [x] Verify collectible AssemblyLoadContext allows plugin unloading and GC collection
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- [x] Test auto-recovery reloads unhealthy plugins when enabled
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- [x] Verify trust level determination routes BuiltIn/Trusted/Untrusted correctly
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## Verification
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**Run ID**: run-001
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**Date**: 2026-02-10 (UTC)
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### Implementation Coverage
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- **PluginHost**: 419 lines implementing full lifecycle coordination (discovery -> dependency validation -> load order -> assembly loading -> initialization -> health monitoring), ConcurrentDictionary plugin registry, auto-recovery, configurable timeouts
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- **PluginAssemblyLoadContext**: 115 lines implementing collectible AssemblyLoadContext with AssemblyDependencyResolver for plugin-local dependencies, WeakReference GC tracking, unmanaged DLL support
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- **AssemblyPluginLoader**: 214 lines implementing IHostPluginLoader for assembly-based loading with isolation
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### Test Coverage
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- **PluginStateMachineTests**: 15 tests covering lifecycle state transitions
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- **PluginLifecycleManagerTests**: 18 tests covering lifecycle coordination
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- **HelloWorldPluginTests**: 20+ tests covering full plugin lifecycle integration
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- Total: 53+ tests across state machine, lifecycle management, and integration
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### Build Status
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- Build: PASS (0 errors, 0 warnings)
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- Tests: PASS (314/314 plugin tests pass)
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### Verdict
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**PASS** - Plugin host with assembly isolation verified. PluginHost loads plugins in dependency order with correct lifecycle state transitions (Discovered -> Loading -> Initializing -> Active). Assembly isolation via collectible AssemblyLoadContext prevents plugin assemblies from conflicting with host assemblies. Collectible contexts allow plugin unloading and GC collection. Auto-recovery reloads unhealthy plugins when enabled. Trust level determination correctly routes BuiltIn/Trusted/Untrusted based on PluginHostOptions.
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