feat: finish cacheé

Makefile

@@ -0,0 +1,13 @@
+
+all: run
+
+run:
+	./gradlew run --args="-l Bordeaux"
+
+test:
+	./gradlew test
+
+clean:
+	$(RM) *.cache.json
+
+.PHONY: all run clean

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

@@ -1,10 +1,13 @@
 package eirb.pg203;
 
+import java.io.File;
+import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.time.Instant;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
+import java.util.Scanner;
 
 public class Main {
 	private static class Option {
@@ -27,6 +30,7 @@ public class Main {
 			return value;
 		}
 	}
+
 	public static void main(String[] args) throws IOException, IllegalArgumentException{
 		HashMap<String, Option> options = new HashMap<>();
 		List<String> argsList = new ArrayList<>();
@@ -60,21 +64,25 @@ public class Main {
 		WeatherAPI weatherAPI = new WeatherAPI(WeatherAPIKey);
 		OpenMeteo openMeteo = new OpenMeteo();
 		OpenWeatherMap openWeatherMap = new OpenWeatherMap(OpenWMapKey);
-		WeatherDisplay display = new WeatherDisplayBasic();
-		WeatherDisplay display2 = new WeatherDisplayBasic();
-		WeatherDisplay display3 = new WeatherDisplayBasic();
 
-		display.addAPI(weatherAPI);
+		weatherAPI.loadCacheFromFile("wapi.cache.json");
+		openWeatherMap.loadCacheFromFile("owm.cache.json");
+		openMeteo.loadCacheFromFile("om.cache.json");
+
+		System.out.println(weatherAPI.toJSON().toString());
+
+		WeatherDisplay display = new WeatherDisplayBasic();
+
 		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);
+
+		weatherAPI.saveCacheToFile("wapi.cache.json");
+		openWeatherMap.saveCacheToFile("owm.cache.json");
+		openMeteo.saveCacheToFile("om.cache.json");
 	}
 }

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

@@ -14,10 +14,9 @@ import eirb.pg203.WeatherData.Condition;
 
 // https://api.open-meteo.com/v1/forecast?latitude=52.52&longitude=13.41&hourly=temperature_2m
 
-public class OpenMeteo implements WeatherDataAPI {
+public class OpenMeteo extends WeatherCachedAPI {
 	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 {
@@ -79,11 +78,7 @@ public class OpenMeteo implements WeatherDataAPI {
     return getTemperature(day, cityName);
   }
 
-	@Override
-	public ArrayList<WeatherData> getTemperatures(int days, String cityName) throws IOException {
-    if (!this.cache.needsUpdate(cityName, days))
-      return this.cache.get(cityName, days);
-
+	public ArrayList<WeatherData> fetchTemperatures(int days, String cityName) throws IOException {
 		JSONObject result = fetchWeather(days, new City(cityName));
 		ArrayList<WeatherData> weatherDatas = new ArrayList<>();
 
@@ -93,8 +88,6 @@ public class OpenMeteo implements WeatherDataAPI {
 		  );
 		}
 
-    this.cache.set(cityName, days, weatherDatas, Instant.now());
-
 		return weatherDatas;
 	}
 

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

@@ -16,10 +16,9 @@ import eirb.pg203.WeatherData.Condition;
 
 // https://api.open-meteo.com/v1/forecast?latitude=52.52&longitude=13.41&hourly=temperature_2m
 
-public class OpenWeatherMap implements WeatherDataAPI {
+public class OpenWeatherMap extends WeatherCachedAPI {
 	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;
@@ -110,11 +109,7 @@ public class OpenWeatherMap implements WeatherDataAPI {
     return getTemperature(day, cityname);
   }
 
-  @Override
-  public ArrayList<WeatherData> getTemperatures(int days, String cityName) throws IOException {
-    if (!this.cache.needsUpdate(cityName, days))
-      return this.cache.get(cityName, days);
-
+  public ArrayList<WeatherData> fetchTemperatures(int days, String cityName) throws IOException {
     JSONObject result = fetchWeather(days, new City(cityName));
     ArrayList<WeatherData> weatherDatas = new ArrayList<>();
 
@@ -124,8 +119,6 @@ public class OpenWeatherMap implements WeatherDataAPI {
 		);
     }
 
-    this.cache.set(cityName, days, weatherDatas, Instant.now());
-
     return weatherDatas;
   }
 

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

@@ -15,10 +15,9 @@ import java.util.ArrayList;
 /**
  * WeatherAPI implementation
  */
-public class WeatherAPI implements WeatherDataAPI{
+public class WeatherAPI extends WeatherCachedAPI {
     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;
@@ -91,11 +90,7 @@ public class WeatherAPI implements WeatherDataAPI{
         return getTemperature(day, cityName);
     }
 
-    @Override
-    public ArrayList<WeatherData> getTemperatures(int days, String cityName) throws IOException {
-        if (!this.cache.needsUpdate(cityName, days))
-          return this.cache.get(cityName, days);
-
+    public ArrayList<WeatherData> fetchTemperatures(int days, String cityName) throws IOException {
         JSONObject result = fetchWeather(days, cityName);
         ArrayList<WeatherData> weatherDatas = new ArrayList<>();
 
@@ -105,8 +100,6 @@ public class WeatherAPI implements WeatherDataAPI{
             );
         }
 
-        this.cache.set(cityName, days, weatherDatas, Instant.now());
-
         return weatherDatas;
     }
 

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

@@ -1,10 +1,82 @@
 package eirb.pg203;
 
-import org.json.JSONObject;
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.FileReader;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.time.Instant;
+import java.util.ArrayList;
+import java.util.Scanner;
+
+import org.json.JSONArray;
 
 abstract class WeatherCachedAPI implements WeatherDataAPI {
     private final WeatherDataCache cache = new WeatherDataCache();
 
-    public void loadCache(JSONObject cache)
+		abstract ArrayList<WeatherData> fetchTemperatures(int days, String cityName) throws IOException;
+
+    public void loadCache(JSONArray data) {
+			this.cache.fromJSON(data, this.getAPIName());
+		}
+
+		private void updateCache(int days, String cityName) throws IOException {
+			ArrayList<WeatherData> data = fetchTemperatures(days, cityName);
+			Instant timestamp = Instant.now();
+
+			for (int i = 0 ; i < days ; ++i)
+				this.cache.set(cityName, i, data.get(i), timestamp);
+		}
+
+    public ArrayList<WeatherData> getTemperatures(int days, String cityName) throws IOException
+		{
+			ArrayList<WeatherData> result = new ArrayList<>();
+
+			for (int i = 0 ; i < days ; ++i)
+			{
+				if (this.cache.needsUpdate(cityName, i))
+				{
+					updateCache(days, cityName);
+				}
+			}
+
+			for (int i = 0 ; i < days ; ++i)
+				result.add(this.cache.get(cityName, i));
+
+			return result;
+		}
+
+		public JSONArray toJSON() {
+			return this.cache.toJSON(this.getAPIName());
+		}
+
+		public void loadCacheFromFile(String path)
+		{
+			try {
+				File file = new File(path);
+				Scanner scanner = new Scanner(file);
+				StringBuilder data = new StringBuilder();
+
+				while (scanner.hasNextLine()) {
+					data.append(scanner.nextLine());
+				}
+				scanner.close();
+
+				this.loadCache(new JSONArray(data.toString()));
+			} catch (FileNotFoundException e) {
+				System.err.println("An error occurred.");
+			}
 
 		}
+
+		public void saveCacheToFile(String path)
+		{
+			try {
+				FileWriter myWriter = new FileWriter(path);
+				myWriter.write(this.toJSON().toString());
+				myWriter.close();
+			} catch (IOException e) {
+				System.out.println("An error occurred while saving cache to " + path);
+			}
+		}
+}

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

@@ -190,18 +190,24 @@ class WeatherData {
 		JSONObject jsonObject = new JSONObject();
 
 		jsonObject.put("city", city.getCityName());
-		jsonObject.put("date", date.toString());
+		jsonObject.put("date", date.toEpochMilli());
 		jsonObject.put("temp", temp);
 		jsonObject.put("condition", condition.toString());
 		jsonObject.put("windSpeed", windSpeed);
 		jsonObject.put("windDirectionAngle", windDirectionAngle);
 		jsonObject.put("windDirection", windDirection.toString());
 
-		return null;
+		return jsonObject;
 	}
 
 	public static WeatherData fromJSON(JSONObject data) {
-		return null;
-	}
+		City city = new City(data.getString("city"));
+		Instant date = Instant.ofEpochMilli(data.getLong("date"));
+		float temp = data.getFloat("temp");
+		float windSpeed = data.getFloat("windSpeed");
+		float windDirectionAngle = data.getFloat("windDirectionAngle");
+		Condition condition = Condition.fromString(data.getString("windDirection"));
 
+		return new WeatherData(city, date, temp, windSpeed, windDirectionAngle, condition);
+	}
 }

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

@@ -3,21 +3,24 @@ package eirb.pg203;
 import java.time.Instant;
 import java.util.ArrayList;
 import java.util.HashMap;
+import java.util.Locale;
 
 import org.json.JSONArray;
 import org.json.JSONObject;
 
 public class WeatherDataCache {
-  static class CacheValue {
-    private ArrayList<WeatherData> value;
+  private static class CacheValue {
+    private WeatherData value;
+    private int day;
     private Instant timestamp;
 
-    CacheValue(ArrayList<WeatherData> value, Instant timestamp) {
+    CacheValue(WeatherData value, int day, Instant timestamp) {
       this.value = value;
       this.timestamp = timestamp;
+			this.day = day;
     }
 
-    public ArrayList<WeatherData> getWeatherData() {
+    public WeatherData getWeatherData() {
       return value;
     }
 
@@ -28,67 +31,107 @@ public class WeatherDataCache {
     /*
      *  Will parse CacheValues with { "api": apiName } from JSON
      */
-    JSONObject toJSON(String apiName, String cityName) {
+    JSONObject toJSON(String apiName, String key) {
       JSONObject jsonObject = new JSONObject();
-      JSONArray values = new JSONArray();
 
-      jsonObject.put("city", cityName);
-      jsonObject.put("api", apiName);
+      jsonObject.put("key", key);
+      jsonObject.put("apiName", apiName);
+      jsonObject.put("day", day);
       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);
+      jsonObject.put("value", this.value.toJSON().toString());
 
       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"));
+			int day = data.getInt("day");
+			String valueString = data.getString("value");
+			JSONObject value  = new JSONObject(valueString);
 
-      return new CacheValue(value, timestamp);
+      return new CacheValue(
+					WeatherData.fromJSON(value),
+					day,
+					timestamp
+				);
     }
   }
 
   private HashMap<String, CacheValue> cache = new HashMap<>();
-  private long cacheTTL = 3600;  // Cache data Time To Live
+  private long cacheTTL = 3600;  // Cache data Time To Live in sec
 
-	public boolean has(String cityName, int days) {
-    CacheValue cacheValue = this.cache.get(cityName);
+	private String makeKey(String cityName, int day) {
+		return String.format(Locale.ENGLISH, "%s%d", cityName, day);
+	}
+
+	/*
+	 * Returns true the cache has the key (cityName, days)
+	 */
+	public boolean has(String cityName, int day) {
+    CacheValue cacheValue = this.cache.get(makeKey(cityName, day));
 
 		return cacheValue != null;
 	}
 
-  public boolean needsUpdate(String cityName, int days) {
-    if (!has(cityName, days))  // if (cityName, days) isn't cached, needs udpate
+	/*
+	 * Returns true if (cityName, day) needs to be udpated in the cache
+	 */
+  public boolean needsUpdate(String cityName, int day) {
+    if (!has(cityName, day))  // if (cityName, day) isn't cached, needs udpate
       return true;
 
-    CacheKey cacheKey = new CacheKey(cityName, days);
-    CacheValue cacheValue = this.cache.get(cacheKey);
+    CacheValue cacheValue = this.cache.get(makeKey(cityName, day));
 
     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();
+	/*
+	 * Get values from the cache
+	 */
+	public WeatherData get(String cityName, int day) {
+    String cacheKey = makeKey(cityName, day);
+    CacheValue weatherDatas = this.cache.get(cacheKey);
 
-		return weatherData;
+		if (weatherDatas == null)
+			return null;
+
+		return weatherDatas.getWeatherData();
 	}
 
-	public void set(String cityName, int days, ArrayList<WeatherData> value, Instant timestamp) {
-    CacheKey cacheKey = new CacheKey(cityName, days);
-    CacheValue cacheValue = new CacheValue(value, timestamp);
+	/*
+	 * Set a value in the cache
+	 */
+	public void set(String cityName, int day, WeatherData value, Instant timestamp) {
+    String cacheKey = makeKey(cityName, day);
+    CacheValue cacheValue = new CacheValue(value, day, timestamp);
 
 		this.cache.put(cacheKey, cacheValue);
 	}
+
+	public JSONArray toJSON(String apiName) {
+		JSONArray out = new JSONArray();
+
+		for (String key: this.cache.keySet()) {
+			CacheValue cacheValue = this.cache.get(key);
+			out.put(cacheValue.toJSON(apiName, key));
+		}
+
+		return out;
+	}
+
+	public void fromJSON(JSONArray data, String apiName) {
+		for (int i = 0 ; i < data.length() ; ++i) {
+			JSONObject entry = data.getJSONObject(i);
+
+			if (entry.getString("apiName").equals(apiName)) {
+				String key = entry.getString("key");
+
+				CacheValue cacheValue = CacheValue.fromJSON(entry);
+				this.cache.put(key, cacheValue);
+			}
+		}
+	}
 }

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

@@ -12,6 +12,7 @@ import org.json.JSONObject;
 public class JSONFetcher {
 
   private static String fetchString(URL url) throws IOException{
+		System.err.println("Requesting " + url);
     StringBuilder result = new StringBuilder();
     HttpURLConnection conn = (HttpURLConnection) url.openConnection();
     conn.setRequestMethod("GET");