docs(02-02): complete diagram rendering plan
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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hsiegeln
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.planning/phases/02-transaction-search-diagrams/02-02-SUMMARY.md
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.planning/phases/02-transaction-search-diagrams/02-02-SUMMARY.md
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---
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phase: 02-transaction-search-diagrams
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plan: 02
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subsystem: api
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tags: [elk, jfreesvg, svg, diagram, layout, content-negotiation]
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requires:
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- phase: 01-ingestion-pipeline
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provides: DiagramRepository with findByContentHash for loading RouteGraph definitions
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provides:
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- DiagramRenderer interface in core module for SVG and JSON layout output
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- ElkDiagramRenderer implementation using ELK layered algorithm and JFreeSVG
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- DiagramRenderController with Accept header content negotiation
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- Color-coded node rendering matching route-diagram-example.html style
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- Compound node support for nested processors (CHOICE, SPLIT, TRY_CATCH)
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affects: [02-03, ui-rendering, execution-overlay]
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tech-stack:
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added: [org.eclipse.elk.core:0.11.0, org.eclipse.elk.alg.layered:0.11.0, org.jfree.svg:5.0.7, org.eclipse.xtext.xbase.lib:2.37.0]
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patterns: [ELK graph construction, JFreeSVG rendering, manual Accept header content negotiation]
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key-files:
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created:
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- cameleer3-server-core/src/main/java/com/cameleer3/server/core/diagram/DiagramRenderer.java
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- cameleer3-server-core/src/main/java/com/cameleer3/server/core/diagram/DiagramLayout.java
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- cameleer3-server-core/src/main/java/com/cameleer3/server/core/diagram/PositionedNode.java
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- cameleer3-server-core/src/main/java/com/cameleer3/server/core/diagram/PositionedEdge.java
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- cameleer3-server-app/src/main/java/com/cameleer3/server/app/diagram/ElkDiagramRenderer.java
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- cameleer3-server-app/src/main/java/com/cameleer3/server/app/controller/DiagramRenderController.java
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- cameleer3-server-app/src/main/java/com/cameleer3/server/app/config/DiagramBeanConfig.java
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- cameleer3-server-app/src/test/java/com/cameleer3/server/app/diagram/ElkDiagramRendererTest.java
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- cameleer3-server-app/src/test/java/com/cameleer3/server/app/controller/DiagramRenderControllerIT.java
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modified:
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- cameleer3-server-app/pom.xml
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key-decisions:
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- "Used ELK layered algorithm with top-to-bottom direction for route diagram layout"
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- "JFreeSVG for server-side SVG generation (lightweight, no Batik dependency)"
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- "Manual Accept header parsing for content negotiation -- JSON only when first preference, SVG as default"
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- "Added xtext xbase lib runtime dependency required by ELK 0.11.0 LayeredMetaDataProvider"
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- "Compound nodes detected via RouteNode.children rather than edge topology analysis"
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patterns-established:
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- "DiagramRenderer interface in core, implementation in app -- swappable rendering backend"
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- "Accept header content negotiation: check first media type preference, default to SVG"
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- "NodeType color mapping via EnumSet groupings for efficient lookup"
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requirements-completed: [DIAG-03]
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duration: 14min
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completed: 2026-03-11
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---
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# Phase 2 Plan 2: Diagram Rendering Summary
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**ELK-based route diagram rendering with color-coded SVG output, JSON layout API, and compound node swimlanes via content-negotiated REST endpoint**
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## Performance
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- **Duration:** 14 min
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- **Started:** 2026-03-11T15:03:12Z
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- **Completed:** 2026-03-11T15:17:22Z
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- **Tasks:** 2
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- **Files modified:** 10
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## Accomplishments
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- Route diagrams render as color-coded top-to-bottom SVG with ELK layered algorithm
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- JSON layout API returns positioned nodes and edges for client-side rendering
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- Compound nodes (CHOICE, SPLIT, TRY_CATCH) render in swimlane containers with children
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- Content negotiation: Accept: application/json returns JSON, everything else defaults to SVG
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- 11 unit tests and 4 integration tests verify layout, colors, content types, and 404 handling
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## Task Commits
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Each task was committed atomically:
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1. **Task 1: Add ELK/JFreeSVG dependencies and create core diagram rendering interfaces** - `6df7450` (feat)
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2. **Task 2: Implement ElkDiagramRenderer, DiagramRenderController, and integration tests** - `c1bc32d` (feat, TDD)
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## Files Created/Modified
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- `cameleer3-server-core/.../diagram/DiagramRenderer.java` - Renderer interface with renderSvg and layoutJson
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- `cameleer3-server-core/.../diagram/DiagramLayout.java` - Layout record (width, height, nodes, edges)
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- `cameleer3-server-core/.../diagram/PositionedNode.java` - Node record with position, dimensions, children
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- `cameleer3-server-core/.../diagram/PositionedEdge.java` - Edge record with waypoints
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- `cameleer3-server-app/.../diagram/ElkDiagramRenderer.java` - ELK + JFreeSVG implementation (~400 lines)
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- `cameleer3-server-app/.../controller/DiagramRenderController.java` - GET /api/v1/diagrams/{hash}/render
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- `cameleer3-server-app/.../config/DiagramBeanConfig.java` - Spring bean wiring for DiagramRenderer
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- `cameleer3-server-app/pom.xml` - Added ELK, JFreeSVG, xtext dependencies
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- `cameleer3-server-app/.../diagram/ElkDiagramRendererTest.java` - 11 unit tests
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- `cameleer3-server-app/.../controller/DiagramRenderControllerIT.java` - 4 integration tests
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## Decisions Made
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- Used ELK layered algorithm (org.eclipse.elk.alg.layered) -- well-maintained, supports compound nodes natively
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- JFreeSVG over Batik -- lightweight, no transitive dependency bloat, sufficient for server-side SVG generation
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- Manual Accept header parsing instead of Spring content negotiation -- simpler, avoids Spring's default JSON preference when Accept includes wildcards
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- Added xtext xbase lib as runtime dependency -- ELK 0.11.0's LayeredMetaDataProvider references CollectionLiterals at class init time
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- Compound node children detected from RouteNode.getChildren() rather than edge topology -- cleaner and matches the agent's graph model
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## Deviations from Plan
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### Auto-fixed Issues
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**1. [Rule 3 - Blocking] Added xtext xbase lib dependency for ELK compatibility**
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- **Found during:** Task 2 (ElkDiagramRenderer implementation)
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- **Issue:** ELK 0.11.0 LayeredMetaDataProvider references org.eclipse.xtext.xbase.lib.CollectionLiterals at class initialization, causing NoClassDefFoundError
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- **Fix:** Added org.eclipse.xtext:org.eclipse.xtext.xbase.lib:2.37.0 dependency to app pom.xml
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- **Files modified:** cameleer3-server-app/pom.xml
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- **Verification:** All unit tests pass after adding dependency
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- **Committed in:** c1bc32d (Task 2 commit)
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**2. [Rule 1 - Bug] Fixed content negotiation default format**
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- **Found during:** Task 2 (integration test for default Accept header)
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- **Issue:** TestRestTemplate sends Accept: text/plain, application/json, */* by default; simple contains("application/json") check returned JSON instead of SVG
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- **Fix:** Changed to check only the first media type in Accept header -- JSON only when explicitly first preference
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- **Files modified:** DiagramRenderController.java
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- **Verification:** Integration test getWithNoAcceptHeader_defaultsToSvg passes
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- **Committed in:** c1bc32d (Task 2 commit)
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**3. [Rule 1 - Bug] Adapted to actual NodeType enum naming (EIP_ prefix)**
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- **Found during:** Task 2 (ElkDiagramRenderer implementation)
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- **Issue:** Plan referenced CHOICE, SPLIT etc. but actual enum values are EIP_CHOICE, EIP_SPLIT etc.
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- **Fix:** Used correct enum names from decompiled cameleer3-common jar in all color mapping sets
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- **Files modified:** ElkDiagramRenderer.java
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- **Verification:** Unit tests verify correct colors for endpoint and processor nodes
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- **Committed in:** c1bc32d (Task 2 commit)
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---
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**Total deviations:** 3 auto-fixed (2 bugs, 1 blocking dependency)
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**Impact on plan:** All auto-fixes necessary for correctness. No scope creep.
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## Issues Encountered
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- ELK 0.11.0 has an undeclared runtime dependency on xtext xbase lib -- resolved by adding explicit dependency
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- RouteEdge.EdgeType uses FLOW/BRANCH/ERROR/CROSS_ROUTE (not NORMAL as plan implied) -- adapted tests accordingly
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## User Setup Required
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None - no external service configuration required.
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## Next Phase Readiness
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- Diagram rendering complete, ready for execution overlay in UI (v2)
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- DiagramRenderer interface can be swapped for alternative implementations
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- JSON layout format suitable for client-side interactive rendering
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---
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*Phase: 02-transaction-search-diagrams*
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*Completed: 2026-03-11*
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