Implemented fallback mechanism for unknown queries(#56)#61
Implemented fallback mechanism for unknown queries(#56)#61DhanashreePetare wants to merge 1 commit intodbpedia:masterfrom
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📝 WalkthroughWalkthroughThe changes enhance fallback handling in the chatbot by adding keyword extraction and DBpedia-based smart reply suggestions to the TextHandler, while updating RiveScript messaging and improving the visual presentation of smart reply components through flexible layout and enhanced interaction states. Changes
Sequence Diagram(s)sequenceDiagram
participant Client
participant TextHandler
participant RiveScript
participant DBpedia
Client->>TextHandler: Process user input
TextHandler->>RiveScript: Query RiveScript
RiveScript-->>TextHandler: Response (or FALLBACK_SCENARIO)
alt Fallback Detected or No Response
TextHandler->>TextHandler: Extract keyword from input
TextHandler->>DBpedia: Fetch smart reply suggestions
DBpedia-->>TextHandler: Return suggestions
TextHandler->>TextHandler: appendFallbackSuggestions()
TextHandler->>TextHandler: Add base prompt + suggestions
end
TextHandler-->>Client: Final response with suggestions
Estimated code review effort🎯 3 (Moderate) | ⏱️ ~22 minutes Pre-merge checks and finishing touches❌ Failed checks (1 warning)
✅ Passed checks (2 passed)
✨ Finishing touches
🧪 Generate unit tests (beta)
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Actionable comments posted: 1
🧹 Nitpick comments (1)
src/main/java/chatbot/lib/handlers/TextHandler.java (1)
12-12: Remove unused import.The
ResponseTypeimport is not used anywhere in this file.🔎 Proposed fix
-import chatbot.lib.response.ResponseType;
📜 Review details
Configuration used: Organization UI
Review profile: CHILL
Plan: Pro
📒 Files selected for processing (3)
app/src/less/modules/smart-reply.lesssrc/main/java/chatbot/lib/handlers/TextHandler.javasrc/main/resources/rivescript/scenario-text.rive
🧰 Additional context used
🧬 Code graph analysis (1)
src/main/java/chatbot/lib/handlers/TextHandler.java (4)
src/main/java/chatbot/lib/handlers/dbpedia/StatusCheckHandler.java (1)
StatusCheckHandler(21-117)src/main/java/chatbot/lib/response/ResponseData.java (1)
ResponseData(13-276)src/main/java/chatbot/lib/response/ResponseGenerator.java (1)
ResponseGenerator(17-116)src/main/java/chatbot/lib/Utility.java (1)
Utility(15-107)
🔇 Additional comments (9)
src/main/resources/rivescript/scenario-text.rive (2)
44-45: LGTM! Improved fallback messaging with actionable guidance.The updated fallback text provides clearer guidance to users and uses ASCII apostrophes to avoid encoding artifacts on Windows. This aligns well with the smart reply suggestions added in TextHandler.java.
48-48: LGTM! Consistent messaging improvements.The no-results text is now more concise and uses ASCII apostrophes consistently with the fallback text changes.
src/main/java/chatbot/lib/handlers/TextHandler.java (4)
31-31: LGTM! Good fallback tracking design.The
fallbackTriggeredfield effectively tracks when the bot enters a fallback path, enabling conditional augmentation of responses.
81-81: LGTM! Fallback flag set at appropriate point.The flag is correctly set when a FALLBACK_SCENARIO is detected, before the existing fallback handling logic executes.
110-127: All TemplateType constants are properly defined and have corresponding handlers.Verification confirms that all six TemplateType constants used in the
appendFallbackSuggestionsmethod (DBPEDIA_ABOUT,DBPEDIA_CONTRIBUTE,CHECK_SERVICE,DBPEDIA_DATASET,DBPEDIA_LOOKUP,DBPEDIA_MAPPINGS) are properly defined in the TemplateType interface and have appropriate handlers in TemplateHandler. The concatenation pattern on line 120 is correctly implemented—the payload is split bySTRING_SEPARATOR("__") and the second part is passed to StatusCheckHandler as expected.
98-101: Verify the fallback suggestion logic—clarify if appending guidance after existing responses is intentional.When
fallbackTriggeredis true (line 81), the code adds responses via Eliza (line 84) or NLHandler (line 88). The condition at line 99 (if(fallbackTriggered || responseGenerator.getResponse().size() == 0)) then appends a fallback prompt and smart reply suggestions viaappendFallbackSuggestions.The method adds guidance elements (a prompt text and UI smart replies), not duplicate responses. However, this means users receive:
- Eliza fallback scenario: [Eliza response] + [Fallback prompt] + [Smart replies]
- NLHandler fallback scenario: [NLHandler responses] + [Fallback prompt] + [Smart replies]
This design could be intentional to guide users in fallback scenarios. However, without tests or documentation clarifying the expected behavior, consider adding a comment explaining whether appending guidance after Eliza/NLHandler responses is intentional, especially if NLHandler already returns useful results.
app/src/less/modules/smart-reply.less (3)
3-6: LGTM! Excellent responsive layout improvement.The switch to flexbox with
flex-wrapandgapgreatly improves responsiveness and maintainability compared to fixed layout approaches. This ensures smart reply pills wrap naturally on smaller screens and maintain consistent spacing.
10-17: LGTM! Polished visual design with smooth transitions.The refined dimensions, explicit color, subtle shadow, and smooth 120ms transition create a more polished and modern appearance. These changes enhance the visual hierarchy and provide better user feedback.
20-26: LGTM! Enhanced interaction states improve usability.The consolidated selector for hover, active, and focus states ensures consistent visual feedback across different interaction modes. The enhanced shadow and explicit removal of text-decoration improve both accessibility and visual polish.
| private String extractKeyword(String text) { | ||
| if(text == null || text.trim().length() == 0) { | ||
| return null; | ||
| } | ||
| String cleaned = text.replaceAll("[^A-Za-z0-9 ]", " ").toLowerCase(); | ||
| String[] tokens = cleaned.split(" +"); | ||
| String[] stop = new String[]{"what","who","where","why","how","is","are","the","a","an","of","in","on","for","with","to","tell","me","about","please"}; | ||
| java.util.Set<String> stopSet = new java.util.HashSet<>(); | ||
| for(String s : stop) stopSet.add(s); | ||
|
|
||
| String best = null; | ||
| for(String t : tokens) { | ||
| if(t.length() < 3) continue; | ||
| if(stopSet.contains(t)) continue; | ||
| if(best == null || t.length() > best.length()) { | ||
| best = t; | ||
| } | ||
| } | ||
| return best; | ||
| } |
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🛠️ Refactor suggestion | 🟠 Major
Remove unused extractKeyword method.
The extractKeyword method is defined but never called anywhere in the codebase. This is dead code that should either be:
- Removed if not needed, or
- Integrated into the fallback logic if it was intended to be used
If this method was intended for future use or for extracting keywords to personalize fallback suggestions, please clarify the intended use case. Otherwise, it should be removed to avoid code bloat.
Do you want me to generate a script to verify it's truly unused across the entire codebase, or open an issue to track its proper integration?
🤖 Prompt for AI Agents
In src/main/java/chatbot/lib/handlers/TextHandler.java around lines 129 to 148,
the extractKeyword method is defined but unused; either remove it or integrate
it into the handler fallback flow. If removing: delete the method and run the
project build/tests to ensure nothing relied on it. If integrating: call
extractKeyword(text) from the fallback handling path that generates user
suggestions, use the returned keyword (when non-null) to personalize or
prioritize suggestions, and update unit tests accordingly. Also run a global
search to confirm no other references remain after the change.
1 participant
Summary
Restrict fallback smart replies to DBpedia-focused options to avoid slow/empty responses on unknown topics.
Refresh smart-reply pill layout (flex wrap, spacing, hover/focus) for clearer tap targets.
Use ASCII apostrophes in fallback/no-results text to avoid encoding artifacts on Windows.
Changes
Testing
Output
Summary by CodeRabbit
New Features
Improvements
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