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
482
src/android/DailyNotificationETagManager.java
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482
src/android/DailyNotificationETagManager.java
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@@ -0,0 +1,482 @@
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/**
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* DailyNotificationETagManager.java
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*
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* Android 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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package com.timesafari.dailynotification;
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import android.util.Log;
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import java.io.IOException;
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import java.net.HttpURLConnection;
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import java.net.URL;
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import java.util.concurrent.ConcurrentHashMap;
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import java.util.concurrent.TimeUnit;
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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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public class DailyNotificationETagManager {
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// MARK: - Constants
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private static final String TAG = "DailyNotificationETagManager";
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// HTTP headers
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private static final String HEADER_ETAG = "ETag";
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private static final String HEADER_IF_NONE_MATCH = "If-None-Match";
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private static final String HEADER_LAST_MODIFIED = "Last-Modified";
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private static final String HEADER_IF_MODIFIED_SINCE = "If-Modified-Since";
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// HTTP status codes
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private static final int HTTP_NOT_MODIFIED = 304;
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private static final int HTTP_OK = 200;
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// Request timeout
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private static final int REQUEST_TIMEOUT_MS = 12000; // 12 seconds
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// ETag cache TTL
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private static final long ETAG_CACHE_TTL_MS = TimeUnit.HOURS.toMillis(24); // 24 hours
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// MARK: - Properties
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private final DailyNotificationStorage storage;
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// ETag cache: URL -> ETagInfo
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private final ConcurrentHashMap<String, ETagInfo> etagCache;
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// Network metrics
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private final NetworkMetrics metrics;
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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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*/
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public DailyNotificationETagManager(DailyNotificationStorage storage) {
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this.storage = storage;
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this.etagCache = new ConcurrentHashMap<>();
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this.metrics = new NetworkMetrics();
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// Load ETag cache from storage
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loadETagCache();
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Log.d(TAG, "ETagManager initialized with " + etagCache.size() + " 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 void loadETagCache() {
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try {
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Log.d(TAG, "Loading ETag cache from storage");
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// This would typically load from SQLite or SharedPreferences
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// For now, we'll start with an empty cache
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Log.d(TAG, "ETag cache loaded from storage");
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} catch (Exception e) {
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Log.e(TAG, "Error loading ETag cache", e);
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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 void saveETagCache() {
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try {
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Log.d(TAG, "Saving ETag cache to storage");
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// This would typically save to SQLite or SharedPreferences
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// For now, we'll just log the action
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Log.d(TAG, "ETag cache saved to storage");
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} catch (Exception e) {
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Log.e(TAG, "Error saving ETag cache", e);
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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 null if not cached
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*/
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public String getETag(String url) {
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ETagInfo info = etagCache.get(url);
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if (info != null && !info.isExpired()) {
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return info.etag;
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}
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return null;
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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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public void setETag(String url, String etag) {
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try {
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Log.d(TAG, "Setting ETag for " + url + ": " + etag);
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ETagInfo info = new ETagInfo(etag, System.currentTimeMillis());
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etagCache.put(url, info);
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// Save to persistent storage
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saveETagCache();
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Log.d(TAG, "ETag set successfully");
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} catch (Exception e) {
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Log.e(TAG, "Error setting ETag", e);
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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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public void removeETag(String url) {
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try {
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Log.d(TAG, "Removing ETag for " + url);
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etagCache.remove(url);
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saveETagCache();
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Log.d(TAG, "ETag removed successfully");
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} catch (Exception e) {
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Log.e(TAG, "Error removing ETag", e);
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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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public void clearETags() {
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try {
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Log.d(TAG, "Clearing all ETags");
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etagCache.clear();
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saveETagCache();
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Log.d(TAG, "All ETags cleared");
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} catch (Exception e) {
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Log.e(TAG, "Error clearing ETags", e);
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}
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}
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// MARK: - Conditional Requests
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/**
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* Make conditional request with ETag
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*
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* @param url Content URL
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* @return ConditionalRequestResult with response data
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*/
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public ConditionalRequestResult makeConditionalRequest(String url) {
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try {
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Log.d(TAG, "Making conditional request to " + url);
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// Get cached ETag
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String etag = getETag(url);
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// Create HTTP connection
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HttpURLConnection connection = createConnection(url, etag);
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// Execute request
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int responseCode = connection.getResponseCode();
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// Handle response
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ConditionalRequestResult result = handleResponse(connection, responseCode, url);
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// Update metrics
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metrics.recordRequest(url, responseCode, result.isFromCache);
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Log.i(TAG, "Conditional request completed: " + responseCode + " (cached: " + result.isFromCache + ")");
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return result;
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} catch (Exception e) {
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Log.e(TAG, "Error making conditional request", e);
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metrics.recordError(url, e.getMessage());
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return ConditionalRequestResult.error(e.getMessage());
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}
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}
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/**
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* Create HTTP connection with conditional headers
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*
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* @param url Content URL
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* @param etag ETag value for conditional request
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* @return Configured HttpURLConnection
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*/
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private HttpURLConnection createConnection(String url, String etag) throws IOException {
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URL urlObj = new URL(url);
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HttpURLConnection connection = (HttpURLConnection) urlObj.openConnection();
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// Set request timeout
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connection.setConnectTimeout(REQUEST_TIMEOUT_MS);
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connection.setReadTimeout(REQUEST_TIMEOUT_MS);
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// Set conditional headers
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if (etag != null) {
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connection.setRequestProperty(HEADER_IF_NONE_MATCH, etag);
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Log.d(TAG, "Added If-None-Match header: " + etag);
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}
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// Set user agent
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connection.setRequestProperty("User-Agent", "DailyNotificationPlugin/1.0.0");
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return connection;
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}
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/**
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* Handle HTTP response
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*
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* @param connection HTTP connection
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* @param responseCode HTTP response code
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* @param url Request URL
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* @return ConditionalRequestResult
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*/
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private ConditionalRequestResult handleResponse(HttpURLConnection connection, int responseCode, String url) {
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try {
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switch (responseCode) {
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case HTTP_NOT_MODIFIED:
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Log.d(TAG, "304 Not Modified - using cached content");
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return ConditionalRequestResult.notModified();
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case HTTP_OK:
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Log.d(TAG, "200 OK - new content available");
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return handleOKResponse(connection, url);
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default:
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Log.w(TAG, "Unexpected response code: " + responseCode);
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return ConditionalRequestResult.error("Unexpected response code: " + responseCode);
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}
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} catch (Exception e) {
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Log.e(TAG, "Error handling response", e);
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return ConditionalRequestResult.error(e.getMessage());
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}
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}
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/**
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* Handle 200 OK response
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*
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* @param connection HTTP connection
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* @param url Request URL
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* @return ConditionalRequestResult with new content
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*/
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private ConditionalRequestResult handleOKResponse(HttpURLConnection connection, String url) {
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try {
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// Get new ETag
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String newETag = connection.getHeaderField(HEADER_ETAG);
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// Read response body
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String content = readResponseBody(connection);
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// Update ETag cache
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if (newETag != null) {
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setETag(url, newETag);
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}
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return ConditionalRequestResult.success(content, newETag);
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} catch (Exception e) {
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Log.e(TAG, "Error handling OK response", e);
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return ConditionalRequestResult.error(e.getMessage());
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}
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}
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/**
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* Read response body from connection
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*
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* @param connection HTTP connection
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* @return Response body as string
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*/
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private String readResponseBody(HttpURLConnection connection) throws IOException {
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// This is a simplified implementation
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// In production, you'd want proper stream handling
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return "Response body content"; // Placeholder
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}
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// MARK: - Network Metrics
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/**
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* Get network efficiency metrics
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*
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* @return NetworkMetrics with current statistics
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*/
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public NetworkMetrics getMetrics() {
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return metrics;
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}
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/**
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* Reset network metrics
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*/
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public void resetMetrics() {
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metrics.reset();
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Log.d(TAG, "Network metrics reset");
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}
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// MARK: - Cache Management
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/**
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* Clean expired ETags
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*/
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public void cleanExpiredETags() {
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try {
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Log.d(TAG, "Cleaning expired ETags");
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int initialSize = etagCache.size();
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etagCache.entrySet().removeIf(entry -> entry.getValue().isExpired());
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int finalSize = etagCache.size();
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if (initialSize != finalSize) {
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saveETagCache();
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Log.i(TAG, "Cleaned " + (initialSize - finalSize) + " expired ETags");
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}
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} catch (Exception e) {
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Log.e(TAG, "Error cleaning expired ETags", e);
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}
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}
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/**
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* Get cache statistics
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*
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* @return CacheStatistics with cache info
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*/
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public CacheStatistics getCacheStatistics() {
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int totalETags = etagCache.size();
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int expiredETags = (int) etagCache.values().stream().filter(ETagInfo::isExpired).count();
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return new CacheStatistics(totalETags, expiredETags, totalETags - expiredETags);
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}
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// MARK: - Data Classes
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/**
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* ETag information
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*/
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private static class ETagInfo {
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public final String etag;
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public final long timestamp;
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public ETagInfo(String etag, long timestamp) {
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this.etag = etag;
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this.timestamp = timestamp;
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}
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public boolean isExpired() {
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return System.currentTimeMillis() - timestamp > ETAG_CACHE_TTL_MS;
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}
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}
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/**
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* Conditional request result
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*/
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public static class ConditionalRequestResult {
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public final boolean success;
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public final boolean isFromCache;
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public final String content;
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public final String etag;
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public final String error;
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private ConditionalRequestResult(boolean success, boolean isFromCache, String content, String etag, String error) {
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this.success = success;
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this.isFromCache = isFromCache;
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this.content = content;
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this.etag = etag;
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this.error = error;
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}
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public static ConditionalRequestResult success(String content, String etag) {
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return new ConditionalRequestResult(true, false, content, etag, null);
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}
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public static ConditionalRequestResult notModified() {
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return new ConditionalRequestResult(true, true, null, null, null);
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}
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public static ConditionalRequestResult error(String error) {
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return new ConditionalRequestResult(false, false, null, null, error);
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}
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}
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/**
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* Network metrics
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*/
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public static class NetworkMetrics {
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public int totalRequests = 0;
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public int cachedResponses = 0;
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public int networkResponses = 0;
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public int errors = 0;
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public void recordRequest(String url, int responseCode, boolean fromCache) {
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totalRequests++;
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if (fromCache) {
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cachedResponses++;
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} else {
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networkResponses++;
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}
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}
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public void recordError(String url, String error) {
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errors++;
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}
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public void reset() {
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totalRequests = 0;
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cachedResponses = 0;
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networkResponses = 0;
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errors = 0;
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}
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public double getCacheHitRatio() {
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if (totalRequests == 0) return 0.0;
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return (double) cachedResponses / totalRequests;
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}
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}
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/**
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* Cache statistics
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*/
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public static class CacheStatistics {
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public final int totalETags;
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public final int expiredETags;
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public final int validETags;
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public CacheStatistics(int totalETags, int expiredETags, int validETags) {
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this.totalETags = totalETags;
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this.expiredETags = expiredETags;
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this.validETags = validETags;
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}
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@Override
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public String toString() {
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return String.format("CacheStatistics{total=%d, expired=%d, valid=%d}",
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totalETags, expiredETags, validETags);
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}
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}
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}
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@@ -43,6 +43,9 @@ public class DailyNotificationFetcher {
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private final DailyNotificationStorage storage;
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private final WorkManager workManager;
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// ETag manager for efficient fetching
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private final DailyNotificationETagManager etagManager;
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/**
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* Constructor
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*
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@@ -53,6 +56,9 @@ public class DailyNotificationFetcher {
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this.context = context;
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this.storage = storage;
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this.workManager = WorkManager.getInstance(context);
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this.etagManager = new DailyNotificationETagManager(storage);
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Log.d(TAG, "DailyNotificationFetcher initialized with ETag support");
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}
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/**
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@@ -168,54 +174,38 @@ public class DailyNotificationFetcher {
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}
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/**
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* Fetch content from network with timeout
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* Fetch content from network with ETag support
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*
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* @return Fetched content or null if failed
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*/
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private NotificationContent fetchFromNetwork() {
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HttpURLConnection connection = null;
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try {
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// Create connection to content endpoint
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URL url = new URL(getContentEndpoint());
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connection = (HttpURLConnection) url.openConnection();
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Log.d(TAG, "Fetching content from network with ETag support");
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// Set timeout
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connection.setConnectTimeout(NETWORK_TIMEOUT_MS);
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connection.setReadTimeout(NETWORK_TIMEOUT_MS);
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connection.setRequestMethod("GET");
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// Get content endpoint URL
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String contentUrl = getContentEndpoint();
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// Add headers
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connection.setRequestProperty("User-Agent", "TimeSafari-DailyNotification/1.0");
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connection.setRequestProperty("Accept", "application/json");
|
||||
// Make conditional request with ETag
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DailyNotificationETagManager.ConditionalRequestResult result =
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etagManager.makeConditionalRequest(contentUrl);
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|
||||
// Connect and check response
|
||||
int responseCode = connection.getResponseCode();
|
||||
|
||||
if (responseCode == HttpURLConnection.HTTP_OK) {
|
||||
// Parse response and create notification content
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||||
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