docs: Add comprehensive implementation plan for callback system
- Create detailed implementation plan with task breakdown - Include realistic time estimates for each phase - Add technical implementation details and code examples - Include testing strategy and success criteria - Add risk mitigation strategies and timeline - Provide immediate next steps and action items Resolves: Implementation planning for callback system and dual scheduling
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Matthew Raymer
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docs/IMPLEMENTATION_PLAN.md
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docs/IMPLEMENTATION_PLAN.md
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# Implementation Plan: Callback System & Dual Scheduling
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**Document Created**: 2025-08-26 11:17:26 UTC
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**Author**: Matthew Raymer
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**Status**: 📋 **PLANNING PHASE**
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**Priority**: 🔴 **HIGH** - Core functionality enhancement required
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## 🎯 **IMPLEMENTATION OVERVIEW**
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### **Goal**
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Transform the Daily Notification Plugin from a single-method scheduler to a dual-method system with comprehensive callback support for external service integration.
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### **Key Changes**
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1. **Add callback system** for API, database, and reporting services
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2. **Implement dual scheduling methods**:
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- `scheduleContentFetch()` - API calls and database storage
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- `scheduleUserNotification()` - Database retrieval and user notification
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3. **Maintain backward compatibility** with existing API
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---
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## 🚀 **IMMEDIATE NEXT STEPS**
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### **Step 1: Create Feature Branch (Next 30 minutes)**
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```bash
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git checkout -b feature/callback-api-integration
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git push -u origin feature/callback-api-integration
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```
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### **Step 2: Interface Design (Next 2-4 hours)**
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- [ ] **Design callback interfaces**
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- [ ] **Create dual scheduling method signatures**
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- [ ] **Plan backward compatibility strategy**
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- [ ] **Document interface changes**
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### **Step 3: Implementation Planning (Next 2-3 hours)**
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- [ ] **Break down implementation into tasks**
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- [ ] **Estimate effort for each component**
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- [ ] **Identify dependencies and risks**
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- [ ] **Create testing strategy**
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---
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## 📋 **DETAILED IMPLEMENTATION TASKS**
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### **Phase 1: Interface Updates (Day 1)**
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#### **Task 1.1: Extend Existing Interfaces**
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**Estimated Effort**: 2-3 hours
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**Priority**: 🔴 **HIGH**
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```typescript
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// Update NotificationOptions interface
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interface NotificationOptions {
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// Existing properties...
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// New callback properties
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apiCallbacks?: APICallbacks;
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databaseCallbacks?: DatabaseCallbacks;
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reportingCallbacks?: ReportingCallbacks;
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}
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```
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**Subtasks**:
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- [ ] Define `APICallbacks` interface
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- [ ] Define `DatabaseCallbacks` interface
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- [ ] Define `ReportingCallbacks` interface
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- [ ] Update existing interface tests
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#### **Task 1.2: Create New Scheduling Interfaces**
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**Estimated Effort**: 2-3 hours
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**Priority**: 🔴 **HIGH**
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```typescript
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interface ContentFetchOptions {
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url: string;
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apiCallbacks: APICallbacks;
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databaseCallbacks: DatabaseCallbacks;
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retryConfig: RetryConfig;
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}
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interface UserNotificationOptions {
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contentId: string;
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notificationCallbacks: NotificationCallbacks;
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userInteractionCallbacks: UserInteractionCallbacks;
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}
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```
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**Subtasks**:
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- [ ] Design `ContentFetchOptions` interface
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- [ ] Design `UserNotificationOptions` interface
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- [ ] Create supporting interfaces (RetryConfig, etc.)
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- [ ] Write interface documentation
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### **Phase 2: Core Implementation (Days 2-3)**
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#### **Task 2.1: Callback Registry System**
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**Estimated Effort**: 6-8 hours
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**Priority**: 🔴 **HIGH**
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```typescript
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class CallbackRegistry {
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registerCallback(type: CallbackType, callback: Function): string;
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unregisterCallback(type: CallbackType, id: string): boolean;
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executeCallback(type: CallbackType, data: any): Promise<void>;
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validateCallback(callback: Function): boolean;
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}
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```
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**Subtasks**:
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- [ ] Implement callback registration system
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- [ ] Add callback validation and security
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- [ ] Create callback execution engine
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- [ ] Add error handling and logging
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- [ ] Write comprehensive tests
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#### **Task 2.2: Dual Scheduling Methods**
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**Estimated Effort**: 8-10 hours
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**Priority**: 🔴 **HIGH**
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```typescript
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// New method 1: Content fetch and storage
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async scheduleContentFetch(options: ContentFetchOptions): Promise<void>
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// New method 2: User notification
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async scheduleUserNotification(options: UserNotificationOptions): Promise<void>
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```
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**Subtasks**:
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- [ ] Implement `scheduleContentFetch()` method
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- [ ] Implement `scheduleUserNotification()` method
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- [ ] Add API call handling with callbacks
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- [ ] Add database operation callbacks
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- [ ] Implement retry and fallback logic
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- [ ] Write method tests
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#### **Task 2.3: Backward Compatibility Layer**
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**Estimated Effort**: 4-6 hours
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**Priority**: 🟡 **MEDIUM**
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```typescript
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// Maintain existing method for backward compatibility
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async scheduleDailyNotification(options: NotificationOptions): Promise<void> {
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// Route to appropriate new method based on options
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if (options.apiCallbacks || options.databaseCallbacks) {
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return this.scheduleContentFetch(this.convertToContentFetchOptions(options));
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} else {
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return this.scheduleUserNotification(this.convertToUserNotificationOptions(options));
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}
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}
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```
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**Subtasks**:
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- [ ] Refactor existing method to use new system
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- [ ] Add deprecation warnings
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- [ ] Create migration path for existing users
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- [ ] Ensure existing functionality continues to work
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### **Phase 3: Platform Integration (Days 3-4)**
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#### **Task 3.1: Android Implementation**
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**Estimated Effort**: 6-8 hours
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**Priority**: 🔴 **HIGH**
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**Subtasks**:
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- [ ] Update Android plugin to support callbacks
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- [ ] Integrate with WorkManager for background tasks
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- [ ] Add database callback support
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- [ ] Implement API callback handling
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- [ ] Add error handling and logging
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#### **Task 3.2: iOS Implementation**
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**Estimated Effort**: 6-8 hours
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**Priority**: 🔴 **HIGH**
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**Subtasks**:
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- [ ] Update iOS plugin to support callbacks
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- [ ] Integrate with BGTaskScheduler
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- [ ] Add Core Data callback support
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- [ ] Implement API callback handling
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- [ ] Add error handling and logging
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#### **Task 3.3: Web Implementation**
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**Estimated Effort**: 4-6 hours
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**Priority**: 🟡 **MEDIUM**
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**Subtasks**:
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- [ ] Update web plugin to support callbacks
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- [ ] Integrate with Service Workers
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- [ ] Add IndexedDB callback support
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- [ ] Implement API callback handling
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- [ ] Add error handling and logging
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### **Phase 4: Testing & Documentation (Day 5)**
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#### **Task 4.1: Comprehensive Testing**
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**Estimated Effort**: 8-10 hours
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**Priority**: 🔴 **HIGH**
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**Subtasks**:
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- [ ] Write unit tests for callback system
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- [ ] Test dual scheduling methods
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- [ ] Test API integration scenarios
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- [ ] Test database callback scenarios
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- [ ] Test cross-platform compatibility
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- [ ] Performance testing
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#### **Task 4.2: Documentation Updates**
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**Estimated Effort**: 4-6 hours
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**Priority**: 🟡 **MEDIUM**
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**Subtasks**:
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- [ ] Update API documentation
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- [ ] Create callback usage examples
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- [ ] Add dual scheduling examples
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- [ ] Create migration guide
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- [ ] Update README and examples
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---
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## 🔧 **TECHNICAL IMPLEMENTATION DETAILS**
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### **Callback Execution Model**
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```typescript
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// Asynchronous callback execution with error handling
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async executeCallback(type: CallbackType, data: any): Promise<void> {
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try {
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const callbacks = this.getCallbacks(type);
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const promises = callbacks.map(callback =>
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this.executeSingleCallback(callback, data)
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);
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await Promise.allSettled(promises);
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} catch (error) {
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this.handleCallbackError(type, error);
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}
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}
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```
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### **Error Handling Strategy**
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```typescript
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// Comprehensive error handling for callbacks
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private handleCallbackError(type: CallbackType, error: Error): void {
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// Log error for debugging
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this.logger.error(`Callback execution failed for type: ${type}`, error);
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// Execute error callbacks if available
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this.executeErrorCallbacks(type, error);
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// Fallback to default error handling
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this.executeDefaultErrorHandling(type, error);
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}
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```
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### **Retry and Fallback Logic**
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```typescript
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// Retry logic with exponential backoff
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async executeWithRetry<T>(
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operation: () => Promise<T>,
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maxRetries: number = 3,
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baseDelay: number = 1000
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): Promise<T> {
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for (let attempt = 1; attempt <= maxRetries; attempt++) {
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try {
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return await operation();
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} catch (error) {
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if (attempt === maxRetries) throw error;
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const delay = baseDelay * Math.pow(2, attempt - 1);
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await this.sleep(delay);
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}
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}
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throw new Error('Max retries exceeded');
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}
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```
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---
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## 🧪 **TESTING STRATEGY**
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### **Unit Testing**
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- **Callback Registration**: Test registration/unregistration
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- **Callback Execution**: Test successful and failed executions
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- **Error Handling**: Test various error scenarios
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- **Performance**: Test callback execution performance
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### **Integration Testing**
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- **API Integration**: Test with real external services
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- **Database Integration**: Test database callback scenarios
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- **Cross-Platform**: Test consistency across platforms
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- **End-to-End**: Test complete notification flow
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### **Performance Testing**
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- **Callback Latency**: Measure execution time
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- **Memory Usage**: Monitor memory impact
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- **Battery Impact**: Test battery usage
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- **Scalability**: Test with multiple callbacks
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---
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## 📊 **SUCCESS CRITERIA**
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### **Functional Requirements**
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- [ ] **Callback System**: 100% callback execution success rate
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- [ ] **Dual Scheduling**: Both methods working independently
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- [ ] **API Integration**: Successful external service integration
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- [ ] **Database Support**: Reliable callback-based storage operations
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- [ ] **Backward Compatibility**: Existing code continues to work
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### **Quality Requirements**
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- [ ] **Test Coverage**: 95%+ coverage for new functionality
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- [ ] **Performance**: No degradation in existing functionality
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- [ ] **Security**: Secure callback execution and validation
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- [ ] **Documentation**: Complete API documentation updates
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### **Platform Requirements**
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- [ ] **Android**: Full callback support with WorkManager
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- [ ] **iOS**: Full callback support with BGTaskScheduler
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- [ ] **Web**: Full callback support with Service Workers
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- [ ] **Cross-Platform**: Consistent behavior across platforms
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---
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## 🚨 **RISKS & MITIGATION**
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### **High-Risk Areas**
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1. **Interface Changes**: Breaking changes to existing API
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- **Mitigation**: Maintain backward compatibility with deprecation warnings
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2. **Performance Impact**: Callback overhead on notification delivery
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- **Mitigation**: Implement callback batching and optimization
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3. **Platform Differences**: Ensuring consistent behavior across platforms
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- **Mitigation**: Create platform-agnostic callback interfaces
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4. **Error Handling**: Complex callback failure scenarios
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- **Mitigation**: Comprehensive error handling with fallbacks
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### **Risk Mitigation Strategies**
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- **Phased Implementation**: Implement in small, testable units
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- **Comprehensive Testing**: Test all scenarios thoroughly
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- **Performance Monitoring**: Monitor impact throughout implementation
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- **Rollback Plan**: Maintain ability to revert changes if needed
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---
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## 📅 **TIMELINE & MILESTONES**
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### **Week 1: Foundation & Design**
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- **Day 1**: Interface design and planning
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- **Day 2**: Core implementation planning
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- **Day 3**: Begin core implementation
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### **Week 2: Implementation & Integration**
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- **Day 4**: Complete core implementation
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- **Day 5**: Begin platform integration
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- **Day 6**: Complete platform integration
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- **Day 7**: Begin testing
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### **Week 3: Testing & Documentation**
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- **Day 8**: Complete testing
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- **Day 9**: Documentation updates
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- **Day 10**: Final review and deployment
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---
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## 🎯 **NEXT IMMEDIATE ACTIONS**
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### **Today (Next 4-6 hours)**
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1. **Create feature branch** for implementation
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2. **Complete interface design** for callback system
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3. **Create implementation plan** with task breakdown
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4. **Set up testing framework** for new functionality
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### **Tomorrow (Next 8-10 hours)**
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1. **Begin core implementation** of callback registry
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2. **Implement dual scheduling methods**
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3. **Add backward compatibility layer**
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4. **Begin platform integration planning**
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---
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**Status**: 📋 **PLANNING PHASE** - Ready to begin implementation
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**Next Milestone**: Complete interface design and create feature branch
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**Estimated Completion**: 2-3 weeks for full implementation
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**Priority**: 🔴 **HIGH** - Core functionality enhancement required
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