Cache the call to the cat API

AllanHasegawa · Jul 30, 2017 · e39ee8c · e39ee8c
1 parent 0a6c8b1
commit e39ee8c
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Showing 2 changed files with 36 additions and 2 deletions.
diff --git a/app/src/main/java/io/catter2/ListActivity.java b/app/src/main/java/io/catter2/ListActivity.java
@@ -16,6 +16,7 @@
 
 import java.util.List;
 
+import io.catter2.cat_api.CacheTheCatAPI;
 import io.catter2.cat_api.FetchCatImagesUseCase;
 import io.catter2.cat_api.RetrofitTheCatAPI;
 import io.catter2.cat_api.TheCatAPI;
@@ -66,8 +67,9 @@ public void imageClicked(ImageView view, String url) {
 
         FavoritesRepository favoritesRepository = new SharedPrefFavoritesRepository(this, userToken);
         addFavoriteUseCase = new AddFavoriteUseCase(favoritesRepository);
-        TheCatAPI catAPI = new RetrofitTheCatAPI();
-        fetchCatImagesUseCase = new FetchCatImagesUseCase(catAPI);
+        TheCatAPI catAPIService = new RetrofitTheCatAPI();
+        TheCatAPI catAPICached = new CacheTheCatAPI(catAPIService);
+        fetchCatImagesUseCase = new FetchCatImagesUseCase(catAPICached);
 
         fetchCatImagesUseCase.getImagesUrls(new FetchCatImagesUseCase.Callback() {
             @Override

diff --git a/app/src/main/java/io/catter2/cat_api/CacheTheCatAPI.java b/app/src/main/java/io/catter2/cat_api/CacheTheCatAPI.java
@@ -0,0 +1,32 @@
+package io.catter2.cat_api;
+
+import android.util.Log;
+
+public class CacheTheCatAPI implements TheCatAPI {
+    private static String TAG = "CacheTheCatAPI";
+
+    private TheCatAPI service;
+    private CatImagesModel lastResponse;
+
+    public CacheTheCatAPI(TheCatAPI service) {
+        this.service = service;
+    }
+
+    @Override
+    public void getCatsWithHats(final Callback callback) {
+        if (lastResponse != null) {
+            Log.d(TAG, "Using cached response.");
+            callback.response(lastResponse);
+        } else {
+            Log.d(TAG, "Querying a new response.");
+            service.getCatsWithHats(new Callback() {
+                @Override
+                public void response(CatImagesModel response) {
+                    Log.d(TAG, "Saving response to cache.");
+                    lastResponse = response;
+                    callback.response(response);
+                }
+            });
+        }
+    }
+}