Jinwoo Hwang created GEODE-10510:
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Summary: Create Release Note for Apache Geode 2.0
Key: GEODE-10510
URL: https://issues.apache.org/jira/browse/GEODE-10510
Project: Geode
Issue Type: Improvement
Reporter: Jinwoo Hwang
Assignee: Jinwoo Hwang
Fix For: 2.0.0
h2. Summary
Upgrade JLine from 2.x to 3.x to modernize GFSH terminal capabilities and
support Spring Shell 3. This migration enhances command-line editing, history,
and completion features.
{*}Impact{*}: GFSH terminal interface | {*}Risk{*}: High | {*}Timeline{*}: 3
weeks
----
h2. Background
h3. Why Required
* {*}Spring Shell 3 dependency{*}: Spring Shell 3.x requires JLine 3.x
* {*}Modern terminal features{*}: Better Unicode support, improved completion
* {*}Active maintenance{*}: JLine 2.x is no longer actively maintained
* {*}Bug fixes{*}: JLine 3.x fixes many terminal handling issues
h3. Current State
* {*}Current{*}: JLine 2.x (legacy)
* {*}Target{*}: JLine 3.x (latest stable)
* {*}Affected Module{*}: {{geode-gfsh}}
* {*}Impact{*}: Terminal I/O, command history, tab completion
----
h2. Scope
h3. *In Scope*
* Terminal reader/writer integration
* Command-line editing (cursor movement, cut/paste)
* Command history management
* Tab completion rendering
* ANSI color support
* Terminal detection and configuration
* Windows/Unix terminal compatibility
h3. *Breaking Changes*
||Component||JLine 2.x||JLine 3.x||Migration Effort||
|*Package*|{{jline.*}}|{{org.jline.*}}|🟡 Import updates|
|*Terminal*|{{ConsoleReader}}|{{LineReader}} + {{Terminal}}|🔴 API rewrite|
|*Completion*|{{Completer}} interface|{{Completer}} + {{Candidate}}|🟡 Moderate
changes|
|*History*|{{History}} class|{{History}} interface|🟡 Refactoring needed|
|*ANSI Colors*|{{AnsiString}}|{{AttributedString}}|🟡 Color code updates|
|*Configuration*|System properties|{{LineReaderBuilder}}|🟡 Config migration|
----
h2. Implementation Plan
h3. *Phase 1: Dependency & Setup* (Week 1, Days 1-2)
* [ ] Update JLine dependency to 3.x in {{DependencyConstraints.groovy}}
* [ ] Resolve dependency conflicts
* [ ] Set up feature branch: {{jline-3-migration}}
* [ ] Create compatibility testing framework
h3. *Phase 2: Core Terminal Migration* (Week 1-2, Days 3-7)
* [ ] Replace {{ConsoleReader}} with {{LineReader}}
* [ ] Migrate {{Terminal}} initialization
* [ ] Update terminal detection logic
* [ ] Configure terminal attributes
* [ ] Migrate input/output streams
h3. *Phase 3: History & Completion* (Week 2, Days 8-10)
* [ ] Migrate command history implementation
* [ ] Update history file handling
* [ ] Migrate tab completion logic
* [ ] Update {{Candidate}} generation for completions
* [ ] Configure completion behavior
h3. *Phase 4: ANSI & Formatting* (Week 2-3, Days 11-12)
* [ ] Migrate ANSI color codes to {{AttributedString}}
* [ ] Update styled output rendering
* [ ] Configure color schemes
* [ ] Test color output on different terminals
h3. *Phase 5: Signal Handling & Advanced Features* (Week 3, Days 13-14)
* [ ] Migrate signal handlers (Ctrl+C, Ctrl+D)
* [ ] Update interrupt handling
* [ ] Configure key bindings
* [ ] Migrate custom widgets (if any)
* [ ] Update terminal size detection
h3. *Phase 6: Testing & Validation* (Week 3, Days 15)
* [ ] Unit tests for terminal I/O
* [ ] Integration tests with GFSH commands
* [ ] Cross-platform testing (Windows, Linux, macOS)
* [ ] Terminal emulator testing (various terminals)
* [ ] Performance testing
*Test Coverage:*
* Command-line editing (insert, delete, move cursor)
* History navigation (up/down arrows)
* Tab completion rendering
* ANSI color display
* Multi-byte character support (Unicode)
* Signal handling (interrupts)
----
h2. Technical Details
h3.
h3. Architecture Changes
h3. Configuration Migration
h3. Key API Mappings
||JLine 2.x||JLine 3.x||Notes||
|{{ConsoleReader}}|{{LineReader}}|Main interface changed|
|{{readLine(prompt)}}|{{readLine(prompt)}}|✅ Same method|
|{{getHistory()}}|{{getHistory()}}|✅ Same method, different impl|
|{{addCompleter()}}|{{setCompleter()}}|Method name changed|
|{{CursorBuffer}}|{{Buffer}}|Internal buffer API changed|
|{{Terminal.getWidth()}}|{{Terminal.getSize().getColumns()}}|Size API changed|
----
h2. Risks & Mitigation
||Risk||Impact||Probability||Mitigation||
|*Terminal compatibility issues*|GFSH unusable on some
platforms|Medium|Extensive cross-platform testing|
|*History file format changes*|Lost command history|Low|Migration script for
history files|
|*Completion rendering broken*|Poor UX|Medium|Thorough completion testing|
|*Signal handling differences*|Ctrl+C doesn't work|Low|Test interrupt scenarios|
|*Performance regression*|Slow input response|Low|Benchmark testing|
|*Unicode issues*|Garbled characters|Medium|Multi-byte character testing|
----
h2. Dependencies
h3. *Blocked By*
* Spring Shell 3 migration (directly depends on JLine 3)
h3. *Blocks*
* Complete GFSH modernization
* Spring Framework 6 migration completion
h3. *Related*
* Spring Shell 3 migration
* Jakarta EE 10 migration
----
h2. Success Criteria
* [ ] JLine 3.x integrated and functional
* [ ] All terminal operations work (input, output, editing)
* [ ] Command history preserved and functional
* [ ] Tab completion rendering correct
* [ ] ANSI colors display properly
* [ ] Cross-platform compatibility (Windows, Linux, macOS)
* [ ] No performance regression
* [ ] All tests passing
* [ ] Signal handling (Ctrl+C, Ctrl+D) works
----
h2. Testing Strategy
h3. *Unit Tests*
* Terminal initialization
* Line reading functionality
* History management
* Completion rendering
* ANSI color formatting
h3. *Integration Tests*
* Full GFSH session
* Command execution with JLine
* History persistence across sessions
* Tab completion in real scenarios
h3. *Edge Cases*
* Very long command lines (> 1000 chars)
* Multi-byte characters (Chinese, Japanese, emoji)
* Terminal resize during input
* Interrupted input (Ctrl+C)
* End-of-file (Ctrl+D)
* Paste large text blocks
----
h2. Resources
* {*}Development{*}: 3 person-weeks (1 developer × 3 weeks)
* {*}QA{*}: 1 week (cross-platform testing)
* {*}Total Effort{*}: ~4 person-weeks
----
h2. References
h3. *Documentation*
* [JLine 3.x Documentation|https://github.com/jline/jline3/wiki]
* [JLine 2 to 3 Migration
Guide|https://github.com/jline/jline3/wiki/Migrating-from-JLine-2.x]
* [Spring Shell 3 + JLine 3
Integration|https://docs.spring.io/spring-shell/docs/current/reference/htmlsingle/]
h3. *Related Issues*
* Spring Shell 3 Migration
* Spring Framework 6 Migration
----
h2. Migration Checklist
h3. Pre-Migration
* [ ] Audit current JLine 2 usage in geode-gfsh
* [ ] Document custom terminal configurations
* [ ] Back up command history format
* [ ] Identify platform-specific code
h3. Migration
* [ ] Update dependencies
* [ ] Migrate ConsoleReader → LineReader
* [ ] Migrate Terminal initialization
* [ ] Update Completers
* [ ] Migrate History handling
* [ ] Update ANSI/color code
* [ ] Fix signal handlers
h3. Post-Migration
* [ ] Platform testing complete
* [ ] Performance validated
* [ ] User documentation updated
* [ ] Migration guide published
----
h2. Notes
h3. *Critical Integration Point*
JLine 3 migration *must be coordinated* with Spring Shell 3 migration, as
Spring Shell 3 has built-in JLine 3 integration. Consider migrating these
together.
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