draft: continue cache

src/main/java/eirb/pg203/Main.java

@@ -61,12 +61,20 @@ public class Main {
 		OpenMeteo openMeteo = new OpenMeteo();
 		OpenWeatherMap openWeatherMap = new OpenWeatherMap(OpenWMapKey);
 		WeatherDisplay display = new WeatherDisplayBasic();
+		WeatherDisplay display2 = new WeatherDisplayBasic();
+		WeatherDisplay display3 = new WeatherDisplayBasic();
 
+		display.addAPI(weatherAPI);
 		display.addAPI(weatherAPI);
 		display.addAPI(openMeteo);
 		display.addAPI(openWeatherMap);
 
+		display2.addAPI(weatherAPI);
+		display3.addAPI(weatherAPI);
+
 		// weatherAPI can't fetch for more than 3 days with free plan
 		display.display(days, city);
+    display2.display(days, city);
+    display3.display(days, city);
     }
 }

src/main/java/eirb/pg203/OpenMeteo.java

@@ -17,6 +17,7 @@ import eirb.pg203.WeatherData.Condition;
 public class OpenMeteo implements WeatherDataAPI {
 	private static final String forecastBaseURL = "https://api.open-meteo.com/v1/forecast";
 	private static final String dailyQuery = "weather_code,temperature_2m_max,temperature_2m_min,wind_speed_10m_max,wind_direction_10m_dominant";
+  private final WeatherDataCache cache = new WeatherDataCache();
 
 	// https://www.nodc.noaa.gov/archive/arc0021/0002199/1.1/data/0-data/HTML/WMO-CODE/WMO4677.HTM
   private JSONObject fetchWeather(int days, City city) throws IOException {
@@ -28,8 +29,7 @@ public class OpenMeteo implements WeatherDataAPI {
 			  )
 	  ).toURL();
 
-	  JSONArray jsonArray = JSONFetcher.fetchArray(url);
+	  return JSONFetcher.fetch(url);
-	  return jsonArray.getJSONObject(0);
   }
 
 	private static Condition getConditionFromCode(int WMOCode) {
@@ -44,7 +44,7 @@ public class OpenMeteo implements WeatherDataAPI {
 	}
 
 
-	private static WeatherData getWeatherDataFromForecast(JSONObject response, int day, String city) {
+	private static WeatherData getWeatherDataFromForecast(JSONObject response, int day, String cityName) {
 		JSONObject daily = response.getJSONObject("daily");
 		float max_temp = daily.getJSONArray("temperature_2m_max").getFloat(day);
 		float min_temp = daily.getJSONArray("temperature_2m_min").getFloat(day);
@@ -55,7 +55,7 @@ public class OpenMeteo implements WeatherDataAPI {
 		int conditionCode = daily.getJSONArray("weather_code").getInt(day);
 
         return new WeatherData(
-				new City(city),
+				new City(cityName),
 				Instant.now(),
 				temp_c,
 				windSpeed,
@@ -68,28 +68,33 @@ public class OpenMeteo implements WeatherDataAPI {
    * @param day Day, 0 ≤ day ≤ 14
    */
   @Override
-  public WeatherData getTemperature(int day, String city) throws IOException {
+  public WeatherData getTemperature(int day, String cityName) throws IOException {
-    JSONObject result = fetchWeather(day + 1, new City(city));
+    JSONObject result = fetchWeather(day + 1, new City(cityName));
 
-    return getWeatherDataFromForecast(result, day, city);
+    return getWeatherDataFromForecast(result, day, cityName);
   }
 
   @Override
-  public WeatherData getTemperature(int day, int hour, String city) throws IOException{
+  public WeatherData getTemperature(int day, int hour, String cityName) throws IOException{
-    return getTemperature(day, city);
+    return getTemperature(day, cityName);
   }
 
 	@Override
-	public ArrayList<WeatherData> getTemperatures(int days, String city) throws IOException {
+	public ArrayList<WeatherData> getTemperatures(int days, String cityName) throws IOException {
-		JSONObject result = fetchWeather(days, new City(city));
+    if (!this.cache.needsUpdate(cityName, days))
+      return this.cache.get(cityName, days);
+
+		JSONObject result = fetchWeather(days, new City(cityName));
 		ArrayList<WeatherData> weatherDatas = new ArrayList<>();
 
 		for (int day = 0; day < days; ++day) {
 			weatherDatas.add(
-			  getWeatherDataFromForecast(result, day, city)
+			  getWeatherDataFromForecast(result, day, cityName)
 		  );
 		}
 
+    this.cache.set(cityName, days, weatherDatas, Instant.now());
+
 		return weatherDatas;
 	}
 

src/main/java/eirb/pg203/OpenWeatherMap.java

@@ -19,6 +19,7 @@ import eirb.pg203.WeatherData.Condition;
 public class OpenWeatherMap implements WeatherDataAPI {
 	private static final String forecastBaseURL = "https://api.openweathermap.org/data/2.5/forecast";
 	private String APIKey;
+  private final WeatherDataCache cache = new WeatherDataCache();
 
 	OpenWeatherMap(String APIKey) {
 		this.APIKey = APIKey;
@@ -37,7 +38,7 @@ public class OpenWeatherMap implements WeatherDataAPI {
     return JSONFetcher.fetch(url);
   }
 
-	private static WeatherData getWeatherDataFromForecast(JSONObject response, int day, String city) {
+	private static WeatherData getWeatherDataFromForecast(JSONObject response, int day, String cityName) {
 		JSONArray list = response.getJSONArray("list");
 
 		DayOfWeek targetedDay = Instant.now().plusSeconds(day * 24 * 3600).atZone(ZoneId.systemDefault()).getDayOfWeek();
@@ -85,7 +86,7 @@ public class OpenWeatherMap implements WeatherDataAPI {
 
 
         return new WeatherData(
-				new City(city),
+				new City(cityName),
 				Instant.now().plusSeconds(day * 24 * 3600),
 				temp_c,
 				windSpeed,
@@ -98,29 +99,33 @@ public class OpenWeatherMap implements WeatherDataAPI {
    * @param day Day, 0 ≤ day ≤ 14
    */
   @Override
-  public WeatherData getTemperature(int day, String city) throws IOException {
+  public WeatherData getTemperature(int day, String cityName) throws IOException {
-    JSONObject result = fetchWeather(day+1, new City(city));
+    JSONObject result = fetchWeather(day+1, new City(cityName));
 
-    return getWeatherDataFromForecast(result, day, city);
+    return getWeatherDataFromForecast(result, day, cityName);
   }
 
   @Override
-  public WeatherData getTemperature(int day, int hour, String city) throws IOException{
+  public WeatherData getTemperature(int day, int hour, String cityname) throws IOException{
-    return getTemperature(day, city);
+    return getTemperature(day, cityname);
   }
 
   @Override
-  public ArrayList<WeatherData> getTemperatures(int days, String city) throws IOException {
+  public ArrayList<WeatherData> getTemperatures(int days, String cityName) throws IOException {
-    JSONObject result = fetchWeather(days, new City(city));
+    if (!this.cache.needsUpdate(cityName, days))
+      return this.cache.get(cityName, days);
 
+    JSONObject result = fetchWeather(days, new City(cityName));
     ArrayList<WeatherData> weatherDatas = new ArrayList<>();
 
     for (int day = 0; day < days ; ++day) {
 		weatherDatas.add(
-			getWeatherDataFromForecast(result, day, city)
+			getWeatherDataFromForecast(result, day, cityName)
 		);
     }
 
+    this.cache.set(cityName, days, weatherDatas, Instant.now());
+
     return weatherDatas;
   }
 

src/main/java/eirb/pg203/WeatherAPI.java

@@ -18,6 +18,7 @@ import java.util.ArrayList;
 public class WeatherAPI implements WeatherDataAPI{
     private final String weatherAPIKey;
 		private static final String forecastBaseURL = "https://api.weatherapi.com/v1/forecast.json";
+    private final WeatherDataCache cache = new WeatherDataCache();
 
     WeatherAPI(String weatherAPIKey) {
         this.weatherAPIKey = weatherAPIKey;
@@ -80,27 +81,32 @@ public class WeatherAPI implements WeatherDataAPI{
      * @param day Day, 0 ≤ day ≤ 14
      */
     @Override
-    public WeatherData getTemperature(int day, String city) throws IOException {
+    public WeatherData getTemperature(int day, String cityName) throws IOException {
-        JSONObject result = fetchWeather(day+1, city);
+        JSONObject result = fetchWeather(day+1, cityName);
-		return getWeatherDataFromForecast(result, day, city);
+		    return getWeatherDataFromForecast(result, day, cityName);
     }
 
     @Override
-    public WeatherData getTemperature(int day, int hour, String city) throws IOException{
+    public WeatherData getTemperature(int day, int hour, String cityName) throws IOException{
-        return getTemperature(day, city);
+        return getTemperature(day, cityName);
     }
 
     @Override
-    public ArrayList<WeatherData> getTemperatures(int days, String city) throws IOException {
+    public ArrayList<WeatherData> getTemperatures(int days, String cityName) throws IOException {
-        JSONObject result = fetchWeather(days, city);
+        if (!this.cache.needsUpdate(cityName, days))
+          return this.cache.get(cityName, days);
+
+        JSONObject result = fetchWeather(days, cityName);
         ArrayList<WeatherData> weatherDatas = new ArrayList<>();
 
         for (int day = 0; day < days; ++day) {
             weatherDatas.add(
-				getWeatherDataFromForecast(result, day, city)
+              getWeatherDataFromForecast(result, day, cityName)
             );
         }
 
+        this.cache.set(cityName, days, weatherDatas, Instant.now());
+
         return weatherDatas;
     }
 

src/main/java/eirb/pg203/WeatherCachedAPI.java

@@ -0,0 +1,10 @@
+package eirb.pg203;
+
+import org.json.JSONObject;
+
+abstract class WeatherCachedAPI implements WeatherDataAPI {
+    private final WeatherDataCache cache = new WeatherDataCache();
+
+    public void loadCache(JSONObject cache)
+
+}

src/main/java/eirb/pg203/WeatherData.java

@@ -7,9 +7,7 @@ import org.json.JSONObject;
 
 import com.sun.net.httpserver.Authenticator.Retry;
 
-import eirb.pg203.utils.JSONCachable;
+class WeatherData {
-
-class WeatherData implements JSONCachable {
 	enum Condition {
 		SUNNY("☀️"),
 		PARTIAL("🌤"),
@@ -188,7 +186,6 @@ class WeatherData implements JSONCachable {
 			);
 	}
 
-	@Override
 	public JSONObject toJSON() {
 		JSONObject jsonObject = new JSONObject();
 
@@ -203,8 +200,7 @@ class WeatherData implements JSONCachable {
 		return null;
 	}
 
-	@Override
+	public static WeatherData fromJSON(JSONObject data) {
-	public JSONCachable fromJSON(JSONObject data) {
 		return null;
 	}
 

src/main/java/eirb/pg203/WeatherDataCache.java

@@ -0,0 +1,94 @@
+package eirb.pg203;
+
+import java.time.Instant;
+import java.util.ArrayList;
+import java.util.HashMap;
+
+import org.json.JSONArray;
+import org.json.JSONObject;
+
+public class WeatherDataCache {
+  static class CacheValue {
+    private ArrayList<WeatherData> value;
+    private Instant timestamp;
+
+    CacheValue(ArrayList<WeatherData> value, Instant timestamp) {
+      this.value = value;
+      this.timestamp = timestamp; 
+    }
+
+    public ArrayList<WeatherData> getWeatherData() {
+      return value;
+    }
+
+    public Instant getTimestamp() {
+      return timestamp;
+    }
+
+    /*
+     *  Will parse CacheValues with { "api": apiName } from JSON
+     */
+    JSONObject toJSON(String apiName, String cityName) {
+      JSONObject jsonObject = new JSONObject();
+      JSONArray values = new JSONArray();
+
+      jsonObject.put("city", cityName);
+      jsonObject.put("api", apiName);
+      jsonObject.put("timestamp", this.timestamp.getEpochSecond());
+
+      for (int i = 0 ; i < this.value.size() ; ++i)
+        values.put(this.value.get(i));
+
+      jsonObject.put("value", values);
+
+      return jsonObject;
+    }
+
+    public static CacheValue fromJSON(JSONObject data) {
+      ArrayList<WeatherData> value = new ArrayList<>();
+
+      JSONArray values = data.getJSONArray("value");
+      for (int i = 0 ; i < values.length() ; ++i)
+        value.add(WeatherData.fromJSON(values.getJSONObject(i)));
+
+      Instant timestamp = Instant.ofEpochSecond(data.getLong("timestamp"));
+
+      return new CacheValue(value, timestamp);
+    }
+  }
+
+  private HashMap<String, CacheValue> cache = new HashMap<>();
+  private long cacheTTL = 3600;  // Cache data Time To Live
+
+	public boolean has(String cityName, int days) {
+    CacheValue cacheValue = this.cache.get(cityName);
+
+		return cacheValue != null;
+	}
+
+  public boolean needsUpdate(String cityName, int days) {
+    if (!has(cityName, days))  // if (cityName, days) isn't cached, needs udpate
+      return true;
+
+    CacheKey cacheKey = new CacheKey(cityName, days);
+    CacheValue cacheValue = this.cache.get(cacheKey);
+
+    long dt = Instant.now().getEpochSecond() - cacheValue.getTimestamp().getEpochSecond();
+
+    return dt > this.cacheTTL;  // if older than TTL, needs update
+  }
+
+	public ArrayList<WeatherData> get(String cityName, int days) {
+    CacheKey cacheKey = new CacheKey(cityName, days);
+    ArrayList<WeatherData> weatherData = this.cache.get(cacheKey).getWeatherData();
+
+		return weatherData;
+	}
+
+	public void set(String cityName, int days, ArrayList<WeatherData> value, Instant timestamp) {
+    CacheKey cacheKey = new CacheKey(cityName, days);
+    CacheValue cacheValue = new CacheValue(value, timestamp);
+
+    this.cache.put(cacheKey, cacheValue);
+	}
+}

src/main/java/eirb/pg203/WeatherDisplayBasic.java

@@ -97,7 +97,6 @@ class WeatherDisplayBasic implements WeatherDisplay {
 			displayWeatherDatas(api.getAPIName(), weatherDataAPIArrayListHashMap.get(api), startColumnString, sourceColumnSize, dayColumnSize);
 			this.displaySeparatorLine(days, sourceColumnSize, dayColumnSizeSeparator);
 		}
-
 	}
 
   public void display(int days, String city) {
@@ -110,6 +109,7 @@ class WeatherDisplayBasic implements WeatherDisplay {
 				System.err.println(e);
 			}
 		}
+
 		this.displayAllWeatherDatas(weatherDatasMap, days);
 	}
 

src/main/java/eirb/pg203/utils/JSONFetcher.java

@@ -21,6 +21,7 @@ public class JSONFetcher {
         result.append(line);
       }
     }
+    System.out.println(url);
 
     return result.toString();
   }