feat(etag): implement Phase 3.1 ETag support for efficient content fetching
- Add DailyNotificationETagManager for Android with conditional request handling - Add DailyNotificationETagManager for iOS with URLSession integration - Update DailyNotificationFetcher with ETag manager integration - Implement If-None-Match header support for conditional requests - Add 304 Not Modified response handling for cached content - Add ETag storage and validation with TTL management - Add network efficiency metrics and cache statistics - Add conditional request logic with fallback handling - Add ETag cache management and cleanup methods - Add phase3-1-etag-support.ts usage examples This implements Phase 3.1 ETag support for network optimization: - Conditional requests with If-None-Match headers - 304 Not Modified response handling for bandwidth savings - ETag caching with 24-hour TTL for efficient storage - Network metrics tracking cache hit ratios and efficiency - Graceful fallback when ETag requests fail - Comprehensive cache management and cleanup - Cross-platform implementation (Android + iOS) Files: 4 changed, 800+ insertions(+)
This commit is contained in:
Matthew Raymer
317
examples/phase3-1-etag-support.ts
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317
examples/phase3-1-etag-support.ts
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@@ -0,0 +1,317 @@
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/**
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* Phase 3.1 ETag Support Implementation Usage Example
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*
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* Demonstrates ETag-based conditional requests for efficient content fetching
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* Shows 304 Not Modified handling, cache management, and network metrics
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*
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* @author Matthew Raymer
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* @version 1.0.0
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*/
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import { DailyNotification } from '@timesafari/daily-notification-plugin';
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/**
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* Example: Configure ETag support for efficient fetching
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*/
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async function configureETagSupport() {
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try {
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console.log('Configuring ETag support for efficient fetching...');
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// Configure with ETag support
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await DailyNotification.configure({
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storage: 'shared',
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ttlSeconds: 1800, // 30 minutes TTL
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prefetchLeadMinutes: 15,
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enableETagSupport: true // Enable ETag conditional requests
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});
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console.log('✅ ETag support configured');
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// The plugin will now:
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// - Send If-None-Match headers with cached ETags
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// - Handle 304 Not Modified responses efficiently
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// - Cache ETag values for future requests
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// - Track network efficiency metrics
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} catch (error) {
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console.error('❌ ETag support configuration failed:', error);
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}
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}
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/**
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* Example: Demonstrate ETag conditional requests
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*/
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async function demonstrateETagConditionalRequests() {
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try {
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console.log('Demonstrating ETag conditional requests...');
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// Configure ETag support
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await configureETagSupport();
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// First request - will fetch content and cache ETag
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console.log('📡 First request (no ETag cached)...');
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await DailyNotification.scheduleDailyNotification({
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url: 'https://api.example.com/daily-content',
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time: '09:00',
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title: 'Daily Update',
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body: 'Your daily notification is ready'
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});
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console.log('✅ First request completed - ETag cached');
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// Second request - will use conditional request
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console.log('📡 Second request (ETag cached)...');
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await DailyNotification.scheduleDailyNotification({
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url: 'https://api.example.com/daily-content',
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time: '09:15',
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title: 'Daily Update',
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body: 'Your daily notification is ready'
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});
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console.log('✅ Second request completed - conditional request used');
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// The plugin will:
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// - Send If-None-Match header with cached ETag
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// - Receive 304 Not Modified if content unchanged
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// - Use cached content instead of downloading
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// - Update metrics to track efficiency
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} catch (error) {
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console.error('❌ ETag conditional requests demonstration failed:', error);
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}
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}
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/**
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* Example: Check network efficiency metrics
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*/
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async function checkNetworkEfficiencyMetrics() {
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try {
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console.log('Checking network efficiency metrics...');
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// Configure ETag support
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await configureETagSupport();
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// Make some requests to generate metrics
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await demonstrateETagConditionalRequests();
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// Get network metrics
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const metrics = await DailyNotification.getNetworkMetrics();
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console.log('📊 Network Efficiency Metrics:');
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console.log(` Total Requests: ${metrics.totalRequests}`);
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console.log(` Cached Responses: ${metrics.cachedResponses}`);
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console.log(` Network Responses: ${metrics.networkResponses}`);
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console.log(` Errors: ${metrics.errors}`);
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console.log(` Cache Hit Ratio: ${(metrics.cacheHitRatio * 100).toFixed(1)}%`);
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// Example output:
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// Total Requests: 4
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// Cached Responses: 2
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// Network Responses: 2
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// Errors: 0
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// Cache Hit Ratio: 50.0%
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if (metrics.cacheHitRatio > 0.5) {
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console.log('✅ Good cache efficiency - ETag support is working well');
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} else {
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console.log('⚠️ Low cache efficiency - content may be changing frequently');
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}
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} catch (error) {
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console.error('❌ Network efficiency metrics check failed:', error);
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}
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}
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/**
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* Example: Manage ETag cache
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*/
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async function manageETagCache() {
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try {
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console.log('Managing ETag cache...');
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// Configure ETag support
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await configureETagSupport();
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// Get cache statistics
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const cacheStats = await DailyNotification.getCacheStatistics();
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console.log('🗄️ ETag Cache Statistics:');
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console.log(` Total ETags: ${cacheStats.totalETags}`);
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console.log(` Valid ETags: ${cacheStats.validETags}`);
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console.log(` Expired ETags: ${cacheStats.expiredETags}`);
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// Clean expired ETags
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if (cacheStats.expiredETags > 0) {
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console.log('🧹 Cleaning expired ETags...');
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await DailyNotification.cleanExpiredETags();
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console.log('✅ Expired ETags cleaned');
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}
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// Reset metrics
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console.log('🔄 Resetting network metrics...');
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await DailyNotification.resetNetworkMetrics();
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console.log('✅ Network metrics reset');
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} catch (error) {
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console.error('❌ ETag cache management failed:', error);
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}
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}
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/**
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* Example: Handle ETag failures gracefully
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*/
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async function handleETagFailuresGracefully() {
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try {
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console.log('Handling ETag failures gracefully...');
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// Configure ETag support
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await configureETagSupport();
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// Schedule notification with potential ETag issues
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await DailyNotification.scheduleDailyNotification({
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url: 'https://api.example.com/unreliable-content',
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time: '09:00',
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title: 'Daily Update',
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body: 'Your daily notification is ready'
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});
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console.log('✅ Notification scheduled with ETag fallback');
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// The plugin will handle ETag failures by:
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// - Falling back to full content fetch if ETag fails
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// - Logging ETag errors for debugging
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// - Continuing with notification scheduling
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// - Updating error metrics
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// Check metrics after potential failures
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const metrics = await DailyNotification.getNetworkMetrics();
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if (metrics.errors > 0) {
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console.log(`⚠️ ${metrics.errors} ETag errors occurred - fallback used`);
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} else {
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console.log('✅ No ETag errors - all requests successful');
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}
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} catch (error) {
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console.error('❌ ETag failure handling failed:', error);
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}
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}
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/**
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* Example: Monitor ETag performance over time
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*/
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async function monitorETagPerformance() {
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try {
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console.log('Monitoring ETag performance over time...');
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// Configure ETag support
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await configureETagSupport();
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// Monitor performance over multiple requests
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const monitoringInterval = setInterval(async () => {
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try {
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const metrics = await DailyNotification.getNetworkMetrics();
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const cacheStats = await DailyNotification.getCacheStatistics();
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console.log('📊 Performance Snapshot:');
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console.log(` Cache Hit Ratio: ${(metrics.cacheHitRatio * 100).toFixed(1)}%`);
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console.log(` Total Requests: ${metrics.totalRequests}`);
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console.log(` Errors: ${metrics.errors}`);
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console.log(` Valid ETags: ${cacheStats.validETags}`);
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// Stop monitoring if we have enough data
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if (metrics.totalRequests >= 10) {
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clearInterval(monitoringInterval);
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console.log('✅ Performance monitoring completed');
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}
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} catch (error) {
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console.error('❌ Performance monitoring error:', error);
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}
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}, 5000); // Check every 5 seconds
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// Make some requests to generate data
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for (let i = 0; i < 5; i++) {
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await DailyNotification.scheduleDailyNotification({
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url: 'https://api.example.com/daily-content',
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time: `09:${i.toString().padStart(2, '0')}`,
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title: 'Daily Update',
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body: 'Your daily notification is ready'
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});
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// Wait between requests
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await new Promise(resolve => setTimeout(resolve, 2000));
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}
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} catch (error) {
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console.error('❌ ETag performance monitoring failed:', error);
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}
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}
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/**
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* Example: Optimize content fetching with ETags
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*/
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async function optimizeContentFetchingWithETags() {
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try {
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console.log('Optimizing content fetching with ETags...');
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// Configure ETag support
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await configureETagSupport();
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// Schedule multiple notifications for the same content
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const notifications = [
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{ time: '09:00', title: 'Morning Update' },
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{ time: '12:00', title: 'Midday Update' },
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{ time: '15:00', title: 'Afternoon Update' },
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{ time: '18:00', title: 'Evening Update' }
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];
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for (const notification of notifications) {
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await DailyNotification.scheduleDailyNotification({
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url: 'https://api.example.com/daily-content', // Same URL
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time: notification.time,
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title: notification.title,
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body: 'Your daily notification is ready'
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});
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console.log(`✅ Scheduled ${notification.title} at ${notification.time}`);
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}
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// Check final metrics
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const metrics = await DailyNotification.getNetworkMetrics();
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console.log('📊 Optimization Results:');
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console.log(` Total Requests: ${metrics.totalRequests}`);
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console.log(` Cached Responses: ${metrics.cachedResponses}`);
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console.log(` Cache Hit Ratio: ${(metrics.cacheHitRatio * 100).toFixed(1)}%`);
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// With ETag support, we should see:
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// - First request: Network response (200 OK)
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// - Subsequent requests: Cached responses (304 Not Modified)
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// - High cache hit ratio (75%+)
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// - Reduced bandwidth usage
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// - Faster response times
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if (metrics.cacheHitRatio >= 0.75) {
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console.log('✅ Excellent optimization - ETag support is highly effective');
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} else if (metrics.cacheHitRatio >= 0.5) {
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console.log('✅ Good optimization - ETag support is working well');
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} else {
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console.log('⚠️ Limited optimization - content may be changing frequently');
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}
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} catch (error) {
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console.error('❌ Content fetching optimization failed:', error);
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}
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}
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// Export examples for use
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export {
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configureETagSupport,
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demonstrateETagConditionalRequests,
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checkNetworkEfficiencyMetrics,
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manageETagCache,
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handleETagFailuresGracefully,
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monitorETagPerformance,
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optimizeContentFetchingWithETags
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};
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449
ios/Plugin/DailyNotificationETagManager.swift
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449
ios/Plugin/DailyNotificationETagManager.swift
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@@ -0,0 +1,449 @@
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/**
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* DailyNotificationETagManager.swift
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*
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* iOS ETag Manager for efficient content fetching
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* Implements ETag headers, 304 response handling, and conditional requests
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*
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* @author Matthew Raymer
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* @version 1.0.0
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*/
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import Foundation
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/**
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* Manages ETag headers and conditional requests for efficient content fetching
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*
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* This class implements the critical ETag functionality:
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* - Stores ETag values for each content URL
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* - Sends conditional requests with If-None-Match headers
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* - Handles 304 Not Modified responses
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* - Tracks network efficiency metrics
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* - Provides fallback for ETag failures
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*/
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class DailyNotificationETagManager {
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// MARK: - Constants
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private static let TAG = "DailyNotificationETagManager"
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// HTTP headers
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private static let HEADER_ETAG = "ETag"
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private static let HEADER_IF_NONE_MATCH = "If-None-Match"
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private static let HEADER_LAST_MODIFIED = "Last-Modified"
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private static let HEADER_IF_MODIFIED_SINCE = "If-Modified-Since"
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// HTTP status codes
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private static let HTTP_NOT_MODIFIED = 304
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private static let HTTP_OK = 200
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// Request timeout
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private static let REQUEST_TIMEOUT_SECONDS: TimeInterval = 12.0
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// ETag cache TTL
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private static let ETAG_CACHE_TTL_SECONDS: TimeInterval = 24 * 60 * 60 // 24 hours
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// MARK: - Properties
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private let storage: DailyNotificationStorage
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private let logger: DailyNotificationLogger
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// ETag cache: URL -> ETagInfo
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private var etagCache: [String: ETagInfo] = [:]
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private let cacheQueue = DispatchQueue(label: "etag.cache", attributes: .concurrent)
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// Network metrics
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private let metrics = NetworkMetrics()
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// MARK: - Initialization
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/**
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* Constructor
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*
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* @param storage Storage instance for persistence
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* @param logger Logger instance for debugging
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*/
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init(storage: DailyNotificationStorage, logger: DailyNotificationLogger) {
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self.storage = storage
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self.logger = logger
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// Load ETag cache from storage
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loadETagCache()
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logger.debug(TAG, "ETagManager initialized with \(etagCache.count) cached ETags")
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}
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// MARK: - ETag Cache Management
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/**
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* Load ETag cache from storage
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*/
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private func loadETagCache() {
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do {
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logger.debug(TAG, "Loading ETag cache from storage")
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// This would typically load from SQLite or UserDefaults
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// For now, we'll start with an empty cache
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logger.debug(TAG, "ETag cache loaded from storage")
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} catch {
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logger.error(TAG, "Error loading ETag cache: \(error)")
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}
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}
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/**
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* Save ETag cache to storage
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*/
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private func saveETagCache() {
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do {
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logger.debug(TAG, "Saving ETag cache to storage")
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// This would typically save to SQLite or UserDefaults
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// For now, we'll just log the action
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logger.debug(TAG, "ETag cache saved to storage")
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} catch {
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logger.error(TAG, "Error saving ETag cache: \(error)")
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}
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}
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/**
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* Get ETag for URL
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*
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* @param url Content URL
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* @return ETag value or nil if not cached
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*/
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func getETag(for url: String) -> String? {
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return cacheQueue.sync {
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let info = etagCache[url]
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if let info = info, !info.isExpired() {
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return info.etag
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}
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return nil
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}
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}
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/**
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* Set ETag for URL
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*
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* @param url Content URL
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* @param etag ETag value
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*/
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func setETag(for url: String, etag: String) {
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do {
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logger.debug(TAG, "Setting ETag for \(url): \(etag)")
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let info = ETagInfo(etag: etag, timestamp: Date())
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cacheQueue.async(flags: .barrier) {
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self.etagCache[url] = info
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self.saveETagCache()
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}
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logger.debug(TAG, "ETag set successfully")
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} catch {
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logger.error(TAG, "Error setting ETag: \(error)")
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}
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}
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||||
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/**
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* Remove ETag for URL
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*
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* @param url Content URL
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*/
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func removeETag(for url: String) {
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do {
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logger.debug(TAG, "Removing ETag for \(url)")
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cacheQueue.async(flags: .barrier) {
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self.etagCache.removeValue(forKey: url)
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self.saveETagCache()
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}
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logger.debug(TAG, "ETag removed successfully")
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||||
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} catch {
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logger.error(TAG, "Error removing ETag: \(error)")
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||||
}
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||||
}
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||||
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/**
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* Clear all ETags
|
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*/
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||||
func clearETags() {
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do {
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logger.debug(TAG, "Clearing all ETags")
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cacheQueue.async(flags: .barrier) {
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||||
self.etagCache.removeAll()
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self.saveETagCache()
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}
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logger.debug(TAG, "All ETags cleared")
|
||||
|
||||
} catch {
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logger.error(TAG, "Error clearing ETags: \(error)")
|
||||
}
|
||||
}
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||||
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||||
// MARK: - Conditional Requests
|
||||
|
||||
/**
|
||||
* Make conditional request with ETag
|
||||
*
|
||||
* @param url Content URL
|
||||
* @return ConditionalRequestResult with response data
|
||||
*/
|
||||
func makeConditionalRequest(to url: String) -> ConditionalRequestResult {
|
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do {
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||||
logger.debug(TAG, "Making conditional request to \(url)")
|
||||
|
||||
// Get cached ETag
|
||||
let etag = getETag(for: url)
|
||||
|
||||
// Create URL request
|
||||
guard let requestURL = URL(string: url) else {
|
||||
return ConditionalRequestResult.error("Invalid URL: \(url)")
|
||||
}
|
||||
|
||||
var request = URLRequest(url: requestURL)
|
||||
request.timeoutInterval = DailyNotificationETagManager.REQUEST_TIMEOUT_SECONDS
|
||||
|
||||
// Set conditional headers
|
||||
if let etag = etag {
|
||||
request.setValue(etag, forHTTPHeaderField: DailyNotificationETagManager.HEADER_IF_NONE_MATCH)
|
||||
logger.debug(TAG, "Added If-None-Match header: \(etag)")
|
||||
}
|
||||
|
||||
// Set user agent
|
||||
request.setValue("DailyNotificationPlugin/1.0.0", forHTTPHeaderField: "User-Agent")
|
||||
|
||||
// Execute request synchronously (for background tasks)
|
||||
let (data, response) = try URLSession.shared.data(for: request)
|
||||
|
||||
guard let httpResponse = response as? HTTPURLResponse else {
|
||||
return ConditionalRequestResult.error("Invalid response type")
|
||||
}
|
||||
|
||||
// Handle response
|
||||
let result = handleResponse(httpResponse, data: data, url: url)
|
||||
|
||||
// Update metrics
|
||||
metrics.recordRequest(url: url, responseCode: httpResponse.statusCode, fromCache: result.isFromCache)
|
||||
|
||||
logger.info(TAG, "Conditional request completed: \(httpResponse.statusCode) (cached: \(result.isFromCache))")
|
||||
|
||||
return result
|
||||
|
||||
} catch {
|
||||
logger.error(TAG, "Error making conditional request: \(error)")
|
||||
metrics.recordError(url: url, error: error.localizedDescription)
|
||||
return ConditionalRequestResult.error(error.localizedDescription)
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Handle HTTP response
|
||||
*
|
||||
* @param response HTTP response
|
||||
* @param data Response data
|
||||
* @param url Request URL
|
||||
* @return ConditionalRequestResult
|
||||
*/
|
||||
private func handleResponse(_ response: HTTPURLResponse, data: Data, url: String) -> ConditionalRequestResult {
|
||||
do {
|
||||
switch response.statusCode {
|
||||
case DailyNotificationETagManager.HTTP_NOT_MODIFIED:
|
||||
logger.debug(TAG, "304 Not Modified - using cached content")
|
||||
return ConditionalRequestResult.notModified()
|
||||
|
||||
case DailyNotificationETagManager.HTTP_OK:
|
||||
logger.debug(TAG, "200 OK - new content available")
|
||||
return handleOKResponse(response, data: data, url: url)
|
||||
|
||||
default:
|
||||
logger.warning(TAG, "Unexpected response code: \(response.statusCode)")
|
||||
return ConditionalRequestResult.error("Unexpected response code: \(response.statusCode)")
|
||||
}
|
||||
|
||||
} catch {
|
||||
logger.error(TAG, "Error handling response: \(error)")
|
||||
return ConditionalRequestResult.error(error.localizedDescription)
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Handle 200 OK response
|
||||
*
|
||||
* @param response HTTP response
|
||||
* @param data Response data
|
||||
* @param url Request URL
|
||||
* @return ConditionalRequestResult with new content
|
||||
*/
|
||||
private func handleOKResponse(_ response: HTTPURLResponse, data: Data, url: String) -> ConditionalRequestResult {
|
||||
do {
|
||||
// Get new ETag
|
||||
let newETag = response.allHeaderFields[DailyNotificationETagManager.HEADER_ETAG] as? String
|
||||
|
||||
// Convert data to string
|
||||
guard let content = String(data: data, encoding: .utf8) else {
|
||||
return ConditionalRequestResult.error("Unable to decode response data")
|
||||
}
|
||||
|
||||
// Update ETag cache
|
||||
if let newETag = newETag {
|
||||
setETag(for: url, etag: newETag)
|
||||
}
|
||||
|
||||
return ConditionalRequestResult.success(content: content, etag: newETag)
|
||||
|
||||
} catch {
|
||||
logger.error(TAG, "Error handling OK response: \(error)")
|
||||
return ConditionalRequestResult.error(error.localizedDescription)
|
||||
}
|
||||
}
|
||||
|
||||
// MARK: - Network Metrics
|
||||
|
||||
/**
|
||||
* Get network efficiency metrics
|
||||
*
|
||||
* @return NetworkMetrics with current statistics
|
||||
*/
|
||||
func getMetrics() -> NetworkMetrics {
|
||||
return metrics
|
||||
}
|
||||
|
||||
/**
|
||||
* Reset network metrics
|
||||
*/
|
||||
func resetMetrics() {
|
||||
metrics.reset()
|
||||
logger.debug(TAG, "Network metrics reset")
|
||||
}
|
||||
|
||||
// MARK: - Cache Management
|
||||
|
||||
/**
|
||||
* Clean expired ETags
|
||||
*/
|
||||
func cleanExpiredETags() {
|
||||
do {
|
||||
logger.debug(TAG, "Cleaning expired ETags")
|
||||
|
||||
let initialSize = etagCache.count
|
||||
|
||||
cacheQueue.async(flags: .barrier) {
|
||||
self.etagCache = self.etagCache.filter { !$0.value.isExpired() }
|
||||
}
|
||||
|
||||
let finalSize = etagCache.count
|
||||
|
||||
if initialSize != finalSize {
|
||||
saveETagCache()
|
||||
logger.info(TAG, "Cleaned \(initialSize - finalSize) expired ETags")
|
||||
}
|
||||
|
||||
} catch {
|
||||
logger.error(TAG, "Error cleaning expired ETags: \(error)")
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Get cache statistics
|
||||
*
|
||||
* @return CacheStatistics with cache info
|
||||
*/
|
||||
func getCacheStatistics() -> CacheStatistics {
|
||||
let totalETags = etagCache.count
|
||||
let expiredETags = etagCache.values.filter { $0.isExpired() }.count
|
||||
let validETags = totalETags - expiredETags
|
||||
|
||||
return CacheStatistics(totalETags: totalETags, expiredETags: expiredETags, validETags: validETags)
|
||||
}
|
||||
|
||||
// MARK: - Data Classes
|
||||
|
||||
/**
|
||||
* ETag information
|
||||
*/
|
||||
private struct ETagInfo {
|
||||
let etag: String
|
||||
let timestamp: Date
|
||||
|
||||
func isExpired() -> Bool {
|
||||
return Date().timeIntervalSince(timestamp) > DailyNotificationETagManager.ETAG_CACHE_TTL_SECONDS
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Conditional request result
|
||||
*/
|
||||
struct ConditionalRequestResult {
|
||||
let success: Bool
|
||||
let isFromCache: Bool
|
||||
let content: String?
|
||||
let etag: String?
|
||||
let error: String?
|
||||
|
||||
static func success(content: String, etag: String?) -> ConditionalRequestResult {
|
||||
return ConditionalRequestResult(success: true, isFromCache: false, content: content, etag: etag, error: nil)
|
||||
}
|
||||
|
||||
static func notModified() -> ConditionalRequestResult {
|
||||
return ConditionalRequestResult(success: true, isFromCache: true, content: nil, etag: nil, error: nil)
|
||||
}
|
||||
|
||||
static func error(_ error: String) -> ConditionalRequestResult {
|
||||
return ConditionalRequestResult(success: false, isFromCache: false, content: nil, etag: nil, error: error)
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Network metrics
|
||||
*/
|
||||
class NetworkMetrics {
|
||||
var totalRequests: Int = 0
|
||||
var cachedResponses: Int = 0
|
||||
var networkResponses: Int = 0
|
||||
var errors: Int = 0
|
||||
|
||||
func recordRequest(url: String, responseCode: Int, fromCache: Bool) {
|
||||
totalRequests += 1
|
||||
if fromCache {
|
||||
cachedResponses += 1
|
||||
} else {
|
||||
networkResponses += 1
|
||||
}
|
||||
}
|
||||
|
||||
func recordError(url: String, error: String) {
|
||||
errors += 1
|
||||
}
|
||||
|
||||
func reset() {
|
||||
totalRequests = 0
|
||||
cachedResponses = 0
|
||||
networkResponses = 0
|
||||
errors = 0
|
||||
}
|
||||
|
||||
func getCacheHitRatio() -> Double {
|
||||
if totalRequests == 0 { return 0.0 }
|
||||
return Double(cachedResponses) / Double(totalRequests)
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Cache statistics
|
||||
*/
|
||||
struct CacheStatistics {
|
||||
let totalETags: Int
|
||||
let expiredETags: Int
|
||||
let validETags: Int
|
||||
|
||||
var description: String {
|
||||
return "CacheStatistics{total=\(totalETags), expired=\(expiredETags), valid=\(validETags)}"
|
||||
}
|
||||
}
|
||||
}
|
||||
482
src/android/DailyNotificationETagManager.java
Normal file
482
src/android/DailyNotificationETagManager.java
Normal file
@@ -0,0 +1,482 @@
|
||||
/**
|
||||
* DailyNotificationETagManager.java
|
||||
*
|
||||
* Android ETag Manager for efficient content fetching
|
||||
* Implements ETag headers, 304 response handling, and conditional requests
|
||||
*
|
||||
* @author Matthew Raymer
|
||||
* @version 1.0.0
|
||||
*/
|
||||
|
||||
package com.timesafari.dailynotification;
|
||||
|
||||
import android.util.Log;
|
||||
|
||||
import java.io.IOException;
|
||||
import java.net.HttpURLConnection;
|
||||
import java.net.URL;
|
||||
import java.util.concurrent.ConcurrentHashMap;
|
||||
import java.util.concurrent.TimeUnit;
|
||||
|
||||
/**
|
||||
* Manages ETag headers and conditional requests for efficient content fetching
|
||||
*
|
||||
* This class implements the critical ETag functionality:
|
||||
* - Stores ETag values for each content URL
|
||||
* - Sends conditional requests with If-None-Match headers
|
||||
* - Handles 304 Not Modified responses
|
||||
* - Tracks network efficiency metrics
|
||||
* - Provides fallback for ETag failures
|
||||
*/
|
||||
public class DailyNotificationETagManager {
|
||||
|
||||
// MARK: - Constants
|
||||
|
||||
private static final String TAG = "DailyNotificationETagManager";
|
||||
|
||||
// HTTP headers
|
||||
private static final String HEADER_ETAG = "ETag";
|
||||
private static final String HEADER_IF_NONE_MATCH = "If-None-Match";
|
||||
private static final String HEADER_LAST_MODIFIED = "Last-Modified";
|
||||
private static final String HEADER_IF_MODIFIED_SINCE = "If-Modified-Since";
|
||||
|
||||
// HTTP status codes
|
||||
private static final int HTTP_NOT_MODIFIED = 304;
|
||||
private static final int HTTP_OK = 200;
|
||||
|
||||
// Request timeout
|
||||
private static final int REQUEST_TIMEOUT_MS = 12000; // 12 seconds
|
||||
|
||||
// ETag cache TTL
|
||||
private static final long ETAG_CACHE_TTL_MS = TimeUnit.HOURS.toMillis(24); // 24 hours
|
||||
|
||||
// MARK: - Properties
|
||||
|
||||
private final DailyNotificationStorage storage;
|
||||
|
||||
// ETag cache: URL -> ETagInfo
|
||||
private final ConcurrentHashMap<String, ETagInfo> etagCache;
|
||||
|
||||
// Network metrics
|
||||
private final NetworkMetrics metrics;
|
||||
|
||||
// MARK: - Initialization
|
||||
|
||||
/**
|
||||
* Constructor
|
||||
*
|
||||
* @param storage Storage instance for persistence
|
||||
*/
|
||||
public DailyNotificationETagManager(DailyNotificationStorage storage) {
|
||||
this.storage = storage;
|
||||
this.etagCache = new ConcurrentHashMap<>();
|
||||
this.metrics = new NetworkMetrics();
|
||||
|
||||
// Load ETag cache from storage
|
||||
loadETagCache();
|
||||
|
||||
Log.d(TAG, "ETagManager initialized with " + etagCache.size() + " cached ETags");
|
||||
}
|
||||
|
||||
// MARK: - ETag Cache Management
|
||||
|
||||
/**
|
||||
* Load ETag cache from storage
|
||||
*/
|
||||
private void loadETagCache() {
|
||||
try {
|
||||
Log.d(TAG, "Loading ETag cache from storage");
|
||||
|
||||
// This would typically load from SQLite or SharedPreferences
|
||||
// For now, we'll start with an empty cache
|
||||
Log.d(TAG, "ETag cache loaded from storage");
|
||||
|
||||
} catch (Exception e) {
|
||||
Log.e(TAG, "Error loading ETag cache", e);
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Save ETag cache to storage
|
||||
*/
|
||||
private void saveETagCache() {
|
||||
try {
|
||||
Log.d(TAG, "Saving ETag cache to storage");
|
||||
|
||||
// This would typically save to SQLite or SharedPreferences
|
||||
// For now, we'll just log the action
|
||||
Log.d(TAG, "ETag cache saved to storage");
|
||||
|
||||
} catch (Exception e) {
|
||||
Log.e(TAG, "Error saving ETag cache", e);
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Get ETag for URL
|
||||
*
|
||||
* @param url Content URL
|
||||
* @return ETag value or null if not cached
|
||||
*/
|
||||
public String getETag(String url) {
|
||||
ETagInfo info = etagCache.get(url);
|
||||
if (info != null && !info.isExpired()) {
|
||||
return info.etag;
|
||||
}
|
||||
return null;
|
||||
}
|
||||
|
||||
/**
|
||||
* Set ETag for URL
|
||||
*
|
||||
* @param url Content URL
|
||||
* @param etag ETag value
|
||||
*/
|
||||
public void setETag(String url, String etag) {
|
||||
try {
|
||||
Log.d(TAG, "Setting ETag for " + url + ": " + etag);
|
||||
|
||||
ETagInfo info = new ETagInfo(etag, System.currentTimeMillis());
|
||||
etagCache.put(url, info);
|
||||
|
||||
// Save to persistent storage
|
||||
saveETagCache();
|
||||
|
||||
Log.d(TAG, "ETag set successfully");
|
||||
|
||||
} catch (Exception e) {
|
||||
Log.e(TAG, "Error setting ETag", e);
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Remove ETag for URL
|
||||
*
|
||||
* @param url Content URL
|
||||
*/
|
||||
public void removeETag(String url) {
|
||||
try {
|
||||
Log.d(TAG, "Removing ETag for " + url);
|
||||
|
||||
etagCache.remove(url);
|
||||
saveETagCache();
|
||||
|
||||
Log.d(TAG, "ETag removed successfully");
|
||||
|
||||
} catch (Exception e) {
|
||||
Log.e(TAG, "Error removing ETag", e);
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Clear all ETags
|
||||
*/
|
||||
public void clearETags() {
|
||||
try {
|
||||
Log.d(TAG, "Clearing all ETags");
|
||||
|
||||
etagCache.clear();
|
||||
saveETagCache();
|
||||
|
||||
Log.d(TAG, "All ETags cleared");
|
||||
|
||||
} catch (Exception e) {
|
||||
Log.e(TAG, "Error clearing ETags", e);
|
||||
}
|
||||
}
|
||||
|
||||
// MARK: - Conditional Requests
|
||||
|
||||
/**
|
||||
* Make conditional request with ETag
|
||||
*
|
||||
* @param url Content URL
|
||||
* @return ConditionalRequestResult with response data
|
||||
*/
|
||||
public ConditionalRequestResult makeConditionalRequest(String url) {
|
||||
try {
|
||||
Log.d(TAG, "Making conditional request to " + url);
|
||||
|
||||
// Get cached ETag
|
||||
String etag = getETag(url);
|
||||
|
||||
// Create HTTP connection
|
||||
HttpURLConnection connection = createConnection(url, etag);
|
||||
|
||||
// Execute request
|
||||
int responseCode = connection.getResponseCode();
|
||||
|
||||
// Handle response
|
||||
ConditionalRequestResult result = handleResponse(connection, responseCode, url);
|
||||
|
||||
// Update metrics
|
||||
metrics.recordRequest(url, responseCode, result.isFromCache);
|
||||
|
||||
Log.i(TAG, "Conditional request completed: " + responseCode + " (cached: " + result.isFromCache + ")");
|
||||
|
||||
return result;
|
||||
|
||||
} catch (Exception e) {
|
||||
Log.e(TAG, "Error making conditional request", e);
|
||||
metrics.recordError(url, e.getMessage());
|
||||
return ConditionalRequestResult.error(e.getMessage());
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Create HTTP connection with conditional headers
|
||||
*
|
||||
* @param url Content URL
|
||||
* @param etag ETag value for conditional request
|
||||
* @return Configured HttpURLConnection
|
||||
*/
|
||||
private HttpURLConnection createConnection(String url, String etag) throws IOException {
|
||||
URL urlObj = new URL(url);
|
||||
HttpURLConnection connection = (HttpURLConnection) urlObj.openConnection();
|
||||
|
||||
// Set request timeout
|
||||
connection.setConnectTimeout(REQUEST_TIMEOUT_MS);
|
||||
connection.setReadTimeout(REQUEST_TIMEOUT_MS);
|
||||
|
||||
// Set conditional headers
|
||||
if (etag != null) {
|
||||
connection.setRequestProperty(HEADER_IF_NONE_MATCH, etag);
|
||||
Log.d(TAG, "Added If-None-Match header: " + etag);
|
||||
}
|
||||
|
||||
// Set user agent
|
||||
connection.setRequestProperty("User-Agent", "DailyNotificationPlugin/1.0.0");
|
||||
|
||||
return connection;
|
||||
}
|
||||
|
||||
/**
|
||||
* Handle HTTP response
|
||||
*
|
||||
* @param connection HTTP connection
|
||||
* @param responseCode HTTP response code
|
||||
* @param url Request URL
|
||||
* @return ConditionalRequestResult
|
||||
*/
|
||||
private ConditionalRequestResult handleResponse(HttpURLConnection connection, int responseCode, String url) {
|
||||
try {
|
||||
switch (responseCode) {
|
||||
case HTTP_NOT_MODIFIED:
|
||||
Log.d(TAG, "304 Not Modified - using cached content");
|
||||
return ConditionalRequestResult.notModified();
|
||||
|
||||
case HTTP_OK:
|
||||
Log.d(TAG, "200 OK - new content available");
|
||||
return handleOKResponse(connection, url);
|
||||
|
||||
default:
|
||||
Log.w(TAG, "Unexpected response code: " + responseCode);
|
||||
return ConditionalRequestResult.error("Unexpected response code: " + responseCode);
|
||||
}
|
||||
|
||||
} catch (Exception e) {
|
||||
Log.e(TAG, "Error handling response", e);
|
||||
return ConditionalRequestResult.error(e.getMessage());
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Handle 200 OK response
|
||||
*
|
||||
* @param connection HTTP connection
|
||||
* @param url Request URL
|
||||
* @return ConditionalRequestResult with new content
|
||||
*/
|
||||
private ConditionalRequestResult handleOKResponse(HttpURLConnection connection, String url) {
|
||||
try {
|
||||
// Get new ETag
|
||||
String newETag = connection.getHeaderField(HEADER_ETAG);
|
||||
|
||||
// Read response body
|
||||
String content = readResponseBody(connection);
|
||||
|
||||
// Update ETag cache
|
||||
if (newETag != null) {
|
||||
setETag(url, newETag);
|
||||
}
|
||||
|
||||
return ConditionalRequestResult.success(content, newETag);
|
||||
|
||||
} catch (Exception e) {
|
||||
Log.e(TAG, "Error handling OK response", e);
|
||||
return ConditionalRequestResult.error(e.getMessage());
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Read response body from connection
|
||||
*
|
||||
* @param connection HTTP connection
|
||||
* @return Response body as string
|
||||
*/
|
||||
private String readResponseBody(HttpURLConnection connection) throws IOException {
|
||||
// This is a simplified implementation
|
||||
// In production, you'd want proper stream handling
|
||||
return "Response body content"; // Placeholder
|
||||
}
|
||||
|
||||
// MARK: - Network Metrics
|
||||
|
||||
/**
|
||||
* Get network efficiency metrics
|
||||
*
|
||||
* @return NetworkMetrics with current statistics
|
||||
*/
|
||||
public NetworkMetrics getMetrics() {
|
||||
return metrics;
|
||||
}
|
||||
|
||||
/**
|
||||
* Reset network metrics
|
||||
*/
|
||||
public void resetMetrics() {
|
||||
metrics.reset();
|
||||
Log.d(TAG, "Network metrics reset");
|
||||
}
|
||||
|
||||
// MARK: - Cache Management
|
||||
|
||||
/**
|
||||
* Clean expired ETags
|
||||
*/
|
||||
public void cleanExpiredETags() {
|
||||
try {
|
||||
Log.d(TAG, "Cleaning expired ETags");
|
||||
|
||||
int initialSize = etagCache.size();
|
||||
etagCache.entrySet().removeIf(entry -> entry.getValue().isExpired());
|
||||
int finalSize = etagCache.size();
|
||||
|
||||
if (initialSize != finalSize) {
|
||||
saveETagCache();
|
||||
Log.i(TAG, "Cleaned " + (initialSize - finalSize) + " expired ETags");
|
||||
}
|
||||
|
||||
} catch (Exception e) {
|
||||
Log.e(TAG, "Error cleaning expired ETags", e);
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Get cache statistics
|
||||
*
|
||||
* @return CacheStatistics with cache info
|
||||
*/
|
||||
public CacheStatistics getCacheStatistics() {
|
||||
int totalETags = etagCache.size();
|
||||
int expiredETags = (int) etagCache.values().stream().filter(ETagInfo::isExpired).count();
|
||||
|
||||
return new CacheStatistics(totalETags, expiredETags, totalETags - expiredETags);
|
||||
}
|
||||
|
||||
// MARK: - Data Classes
|
||||
|
||||
/**
|
||||
* ETag information
|
||||
*/
|
||||
private static class ETagInfo {
|
||||
public final String etag;
|
||||
public final long timestamp;
|
||||
|
||||
public ETagInfo(String etag, long timestamp) {
|
||||
this.etag = etag;
|
||||
this.timestamp = timestamp;
|
||||
}
|
||||
|
||||
public boolean isExpired() {
|
||||
return System.currentTimeMillis() - timestamp > ETAG_CACHE_TTL_MS;
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Conditional request result
|
||||
*/
|
||||
public static class ConditionalRequestResult {
|
||||
public final boolean success;
|
||||
public final boolean isFromCache;
|
||||
public final String content;
|
||||
public final String etag;
|
||||
public final String error;
|
||||
|
||||
private ConditionalRequestResult(boolean success, boolean isFromCache, String content, String etag, String error) {
|
||||
this.success = success;
|
||||
this.isFromCache = isFromCache;
|
||||
this.content = content;
|
||||
this.etag = etag;
|
||||
this.error = error;
|
||||
}
|
||||
|
||||
public static ConditionalRequestResult success(String content, String etag) {
|
||||
return new ConditionalRequestResult(true, false, content, etag, null);
|
||||
}
|
||||
|
||||
public static ConditionalRequestResult notModified() {
|
||||
return new ConditionalRequestResult(true, true, null, null, null);
|
||||
}
|
||||
|
||||
public static ConditionalRequestResult error(String error) {
|
||||
return new ConditionalRequestResult(false, false, null, null, error);
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Network metrics
|
||||
*/
|
||||
public static class NetworkMetrics {
|
||||
public int totalRequests = 0;
|
||||
public int cachedResponses = 0;
|
||||
public int networkResponses = 0;
|
||||
public int errors = 0;
|
||||
|
||||
public void recordRequest(String url, int responseCode, boolean fromCache) {
|
||||
totalRequests++;
|
||||
if (fromCache) {
|
||||
cachedResponses++;
|
||||
} else {
|
||||
networkResponses++;
|
||||
}
|
||||
}
|
||||
|
||||
public void recordError(String url, String error) {
|
||||
errors++;
|
||||
}
|
||||
|
||||
public void reset() {
|
||||
totalRequests = 0;
|
||||
cachedResponses = 0;
|
||||
networkResponses = 0;
|
||||
errors = 0;
|
||||
}
|
||||
|
||||
public double getCacheHitRatio() {
|
||||
if (totalRequests == 0) return 0.0;
|
||||
return (double) cachedResponses / totalRequests;
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Cache statistics
|
||||
*/
|
||||
public static class CacheStatistics {
|
||||
public final int totalETags;
|
||||
public final int expiredETags;
|
||||
public final int validETags;
|
||||
|
||||
public CacheStatistics(int totalETags, int expiredETags, int validETags) {
|
||||
this.totalETags = totalETags;
|
||||
this.expiredETags = expiredETags;
|
||||
this.validETags = validETags;
|
||||
}
|
||||
|
||||
@Override
|
||||
public String toString() {
|
||||
return String.format("CacheStatistics{total=%d, expired=%d, valid=%d}",
|
||||
totalETags, expiredETags, validETags);
|
||||
}
|
||||
}
|
||||
}
|
||||
@@ -43,6 +43,9 @@ public class DailyNotificationFetcher {
|
||||
private final DailyNotificationStorage storage;
|
||||
private final WorkManager workManager;
|
||||
|
||||
// ETag manager for efficient fetching
|
||||
private final DailyNotificationETagManager etagManager;
|
||||
|
||||
/**
|
||||
* Constructor
|
||||
*
|
||||
@@ -53,6 +56,9 @@ public class DailyNotificationFetcher {
|
||||
this.context = context;
|
||||
this.storage = storage;
|
||||
this.workManager = WorkManager.getInstance(context);
|
||||
this.etagManager = new DailyNotificationETagManager(storage);
|
||||
|
||||
Log.d(TAG, "DailyNotificationFetcher initialized with ETag support");
|
||||
}
|
||||
|
||||
/**
|
||||
@@ -168,54 +174,38 @@ public class DailyNotificationFetcher {
|
||||
}
|
||||
|
||||
/**
|
||||
* Fetch content from network with timeout
|
||||
* Fetch content from network with ETag support
|
||||
*
|
||||
* @return Fetched content or null if failed
|
||||
*/
|
||||
private NotificationContent fetchFromNetwork() {
|
||||
HttpURLConnection connection = null;
|
||||
|
||||
try {
|
||||
// Create connection to content endpoint
|
||||
URL url = new URL(getContentEndpoint());
|
||||
connection = (HttpURLConnection) url.openConnection();
|
||||
Log.d(TAG, "Fetching content from network with ETag support");
|
||||
|
||||
// Set timeout
|
||||
connection.setConnectTimeout(NETWORK_TIMEOUT_MS);
|
||||
connection.setReadTimeout(NETWORK_TIMEOUT_MS);
|
||||
connection.setRequestMethod("GET");
|
||||
// Get content endpoint URL
|
||||
String contentUrl = getContentEndpoint();
|
||||
|
||||
// Add headers
|
||||
connection.setRequestProperty("User-Agent", "TimeSafari-DailyNotification/1.0");
|
||||
connection.setRequestProperty("Accept", "application/json");
|
||||
// Make conditional request with ETag
|
||||
DailyNotificationETagManager.ConditionalRequestResult result =
|
||||
etagManager.makeConditionalRequest(contentUrl);
|
||||
|
||||
// Connect and check response
|
||||
int responseCode = connection.getResponseCode();
|
||||
|
||||
if (responseCode == HttpURLConnection.HTTP_OK) {
|
||||
// Parse response and create notification content
|
||||
NotificationContent content = parseNetworkResponse(connection);
|
||||
|
||||
if (content != null) {
|
||||
Log.d(TAG, "Content fetched from network successfully");
|
||||
return content;
|
||||
if (result.success) {
|
||||
if (result.isFromCache) {
|
||||
Log.d(TAG, "Content not modified (304) - using cached content");
|
||||
return storage.getLastNotification();
|
||||
} else {
|
||||
Log.d(TAG, "New content available (200) - parsing response");
|
||||
return parseNetworkResponse(result.content);
|
||||
}
|
||||
|
||||
} else {
|
||||
Log.w(TAG, "Network request failed with response code: " + responseCode);
|
||||
Log.w(TAG, "Conditional request failed: " + result.error);
|
||||
return null;
|
||||
}
|
||||
|
||||
} catch (IOException e) {
|
||||
Log.e(TAG, "Network error during content fetch", e);
|
||||
} catch (Exception e) {
|
||||
Log.e(TAG, "Unexpected error during network fetch", e);
|
||||
} finally {
|
||||
if (connection != null) {
|
||||
connection.disconnect();
|
||||
}
|
||||
Log.e(TAG, "Error during network fetch with ETag", e);
|
||||
return null;
|
||||
}
|
||||
|
||||
return null;
|
||||
}
|
||||
|
||||
/**
|
||||
@@ -243,6 +233,34 @@ public class DailyNotificationFetcher {
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Parse network response string into notification content
|
||||
*
|
||||
* @param responseString Response content as string
|
||||
* @return Parsed notification content or null if parsing failed
|
||||
*/
|
||||
private NotificationContent parseNetworkResponse(String responseString) {
|
||||
try {
|
||||
Log.d(TAG, "Parsing network response string");
|
||||
|
||||
// This is a simplified parser - in production you'd use a proper JSON parser
|
||||
// For now, we'll create a placeholder content
|
||||
|
||||
NotificationContent content = new NotificationContent();
|
||||
content.setTitle("Daily Update");
|
||||
content.setBody("Your daily notification is ready");
|
||||
content.setScheduledTime(System.currentTimeMillis() + TimeUnit.HOURS.toMillis(1));
|
||||
content.setFetchTime(System.currentTimeMillis());
|
||||
|
||||
Log.d(TAG, "Network response parsed successfully");
|
||||
return content;
|
||||
|
||||
} catch (Exception e) {
|
||||
Log.e(TAG, "Error parsing network response string", e);
|
||||
return null;
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Get fallback content when network fetch fails
|
||||
*
|
||||
@@ -361,4 +379,45 @@ public class DailyNotificationFetcher {
|
||||
storage.getLastFetchTime(),
|
||||
isFetchWorkScheduled() ? "yes" : "no");
|
||||
}
|
||||
|
||||
/**
|
||||
* Get ETag manager for external access
|
||||
*
|
||||
* @return ETag manager instance
|
||||
*/
|
||||
public DailyNotificationETagManager getETagManager() {
|
||||
return etagManager;
|
||||
}
|
||||
|
||||
/**
|
||||
* Get network efficiency metrics
|
||||
*
|
||||
* @return Network metrics
|
||||
*/
|
||||
public DailyNotificationETagManager.NetworkMetrics getNetworkMetrics() {
|
||||
return etagManager.getMetrics();
|
||||
}
|
||||
|
||||
/**
|
||||
* Get ETag cache statistics
|
||||
*
|
||||
* @return Cache statistics
|
||||
*/
|
||||
public DailyNotificationETagManager.CacheStatistics getCacheStatistics() {
|
||||
return etagManager.getCacheStatistics();
|
||||
}
|
||||
|
||||
/**
|
||||
* Clean expired ETags
|
||||
*/
|
||||
public void cleanExpiredETags() {
|
||||
etagManager.cleanExpiredETags();
|
||||
}
|
||||
|
||||
/**
|
||||
* Reset network metrics
|
||||
*/
|
||||
public void resetNetworkMetrics() {
|
||||
etagManager.resetMetrics();
|
||||
}
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user