Fix sample app to init Store on Application creation

app/src/main/AndroidManifest.xml

@@ -8,9 +8,10 @@
         android:icon="@mipmap/ic_launcher"
         android:label="@string/app_name"
         android:supportsRtl="true"
+        android:name=".SampleApp"
         android:theme="@style/AppTheme">
         <activity
-            android:name=".activity.PersistingStoreActivity">
+            android:name=".activity.StoreActivity">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN"/>
 

app/src/main/java/com/nytimes/android/sample/SampleApp.java

@@ -0,0 +1,100 @@
+package com.nytimes.android.sample;
+
+import android.app.Application;
+
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
+import com.nytimes.android.external.cache.CacheBuilder;
+import com.nytimes.android.external.fs.SourcePersisterFactory;
+import com.nytimes.android.external.store.base.Persister;
+import com.nytimes.android.external.store.base.impl.BarCode;
+import com.nytimes.android.external.store.base.impl.Store;
+import com.nytimes.android.external.store.base.impl.StoreBuilder;
+import com.nytimes.android.external.store.middleware.GsonParserFactory;
+import com.nytimes.android.sample.data.model.GsonAdaptersModel;
+import com.nytimes.android.sample.data.model.RedditData;
+import com.nytimes.android.sample.data.remote.Api;
+
+import java.io.IOException;
+import java.util.concurrent.TimeUnit;
+
+import okio.BufferedSource;
+import retrofit2.GsonConverterFactory;
+import retrofit2.Retrofit;
+import retrofit2.RxJavaCallAdapterFactory;
+import rx.Observable;
+
+public class SampleApp extends Application {
+
+    private Store<RedditData, BarCode> nonPersistedStore;
+    private Store<RedditData, BarCode> persistedStore;
+    private Persister<BufferedSource, BarCode> persister;
+
+    @Override
+    public void onCreate() {
+        super.onCreate();
+
+        initPersister();
+        this.nonPersistedStore = provideRedditStore();
+        this.persistedStore = providePersistedRedditStore();
+    }
+
+    private void initPersister() {
+        try {
+            persister = newPersister();
+        } catch (IOException exception) {
+            throw new RuntimeException(exception);
+        }
+    }
+
+    public Store<RedditData, BarCode> getNonPersistedStore() {
+        return this.nonPersistedStore;
+    }
+
+    public Store<RedditData, BarCode> getPersistedStore() {
+        return this.persistedStore;
+    }
+
+    private Store<RedditData, BarCode> provideRedditStore() {
+        return StoreBuilder.<RedditData>barcode()
+                .fetcher(barCode -> provideRetrofit().fetchSubreddit(barCode.getKey(), "10"))
+                .memory(CacheBuilder.newBuilder()
+                        .maximumSize(1)
+                        .expireAfterWrite(10, TimeUnit.SECONDS)
+                        .build())
+                .open();
+    }
+
+    private Store<RedditData, BarCode> providePersistedRedditStore() {
+        return StoreBuilder.<BarCode, BufferedSource, RedditData>parsedWithKey()
+                .fetcher(this::fetcher)
+                .persister(persister)
+                .parser(GsonParserFactory.createSourceParser(provideGson(), RedditData.class))
+                .open();
+    }
+
+    private Persister<BufferedSource, BarCode> newPersister() throws IOException {
+        return SourcePersisterFactory.create(getApplicationContext().getCacheDir());
+    }
+
+    private Observable<BufferedSource> fetcher(BarCode barCode) {
+        return provideRetrofit().fetchSubredditForPersister(barCode.getKey(), "10")
+                .map(responseBody -> responseBody.source());
+    }
+
+    private Api provideRetrofit() {
+        return new Retrofit.Builder()
+                .baseUrl("http://reddit.com/")
+                .addConverterFactory(GsonConverterFactory.create(provideGson()))
+                .addCallAdapterFactory(RxJavaCallAdapterFactory.create())
+                .validateEagerly(BuildConfig.DEBUG)  // Fail early: check Retrofit configuration at creation time in Debug build.
+                .build()
+                .create(Api.class);
+    }
+
+    Gson provideGson() {
+        return new GsonBuilder()
+                .registerTypeAdapterFactory(new GsonAdaptersModel())
+                .create();
+    }
+}

app/src/main/java/com/nytimes/android/sample/activity/PersistingStoreActivity.java

@@ -7,30 +7,17 @@ import android.support.v7.widget.RecyclerView;
 import android.support.v7.widget.Toolbar;
 import android.widget.Toast;
 
-import com.google.gson.Gson;
-import com.google.gson.GsonBuilder;
-import com.nytimes.android.external.fs.SourcePersisterFactory;
-import com.nytimes.android.external.store.base.Persister;
-import com.nytimes.android.external.store.base.impl.Store;
 import com.nytimes.android.external.store.base.impl.BarCode;
-import com.nytimes.android.external.store.base.impl.StoreBuilder;
-import com.nytimes.android.external.store.middleware.GsonParserFactory;
-import com.nytimes.android.sample.BuildConfig;
+import com.nytimes.android.external.store.base.impl.Store;
 import com.nytimes.android.sample.R;
+import com.nytimes.android.sample.SampleApp;
 import com.nytimes.android.sample.data.model.Children;
-import com.nytimes.android.sample.data.model.GsonAdaptersModel;
 import com.nytimes.android.sample.data.model.Post;
 import com.nytimes.android.sample.data.model.RedditData;
-import com.nytimes.android.sample.data.remote.Api;
 import com.nytimes.android.sample.reddit.PostAdapter;
 
-import java.io.IOException;
 import java.util.List;
 
-import okio.BufferedSource;
-import retrofit2.GsonConverterFactory;
-import retrofit2.Retrofit;
-import retrofit2.RxJavaCallAdapterFactory;
 import rx.Observable;
 import rx.android.schedulers.AndroidSchedulers;
 import rx.schedulers.Schedulers;
@@ -40,9 +27,9 @@ import static android.widget.Toast.makeText;
 
 public class PersistingStoreActivity extends AppCompatActivity {
 
-    private Persister<BufferedSource, BarCode> persister;
     private RecyclerView recyclerView;
     private PostAdapter postAdapter;
+    private Store<RedditData, BarCode> persistedStore;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
@@ -51,25 +38,24 @@ public class PersistingStoreActivity extends AppCompatActivity {
         setContentView(R.layout.activity_store);
         setSupportActionBar((Toolbar) findViewById(R.id.toolbar));
 
-        try {
-            persister = newPersister();
-        } catch (IOException exception) {
-            throw new RuntimeException(exception);
-        }
-
         postAdapter = new PostAdapter();
         recyclerView = (RecyclerView) findViewById(R.id.postRecyclerView);
         LinearLayoutManager layoutManager = new LinearLayoutManager(this);
         layoutManager.setOrientation(LinearLayoutManager.VERTICAL);
         recyclerView.setLayoutManager(layoutManager);
         recyclerView.setAdapter(postAdapter);
+    }
 
-        loadPosts();
+    private void initStore() {
+        if (this.persistedStore == null) {
+            this.persistedStore = ((SampleApp) getApplicationContext()).getPersistedStore();
+        }
     }
 
     public void loadPosts() {
         BarCode awwRequest = new BarCode(RedditData.class.getSimpleName(), "aww");
-        provideRedditStore()
+
+        this.persistedStore
                 .get(awwRequest)
                 .flatMap(this::sanitizeData)
                 .toList()
@@ -92,36 +78,10 @@ public class PersistingStoreActivity extends AppCompatActivity {
                 .map(Children::data);
     }
 
-    private Store<RedditData, BarCode> provideRedditStore() {
-        return StoreBuilder.<BarCode, BufferedSource, RedditData>parsedWithKey()
-                .fetcher(this::fetcher)
-                .persister(persister)
-                .parser(GsonParserFactory.createSourceParser(provideGson(), RedditData.class))
-                .open();
-    }
-
-    private Persister<BufferedSource, BarCode> newPersister() throws IOException {
-        return SourcePersisterFactory.create(getApplicationContext().getCacheDir());
-    }
-
-    private Observable<BufferedSource> fetcher(BarCode barCode) {
-        return provideRetrofit().fetchSubredditForPersister(barCode.getKey(), "10")
-                .map(responseBody -> responseBody.source());
-    }
-
-    private Api provideRetrofit() {
-        return new Retrofit.Builder()
-                .baseUrl("http://reddit.com/")
-                .addConverterFactory(GsonConverterFactory.create(provideGson()))
-                .addCallAdapterFactory(RxJavaCallAdapterFactory.create())
-                .validateEagerly(BuildConfig.DEBUG)  // Fail early: check Retrofit configuration at creation time in Debug build.
-                .build()
-                .create(Api.class);
-    }
-
-    Gson provideGson() {
-        return new GsonBuilder()
-                .registerTypeAdapterFactory(new GsonAdaptersModel())
-                .create();
+    @Override
+    protected void onResume() {
+        super.onResume();
+        initStore();
+        loadPosts();
     }
 }

app/src/main/java/com/nytimes/android/sample/activity/StoreActivity.java

@@ -8,25 +8,17 @@ import android.support.v7.widget.Toolbar;
 import android.util.Log;
 import android.widget.Toast;
 
-import com.google.gson.Gson;
-import com.google.gson.GsonBuilder;
-import com.nytimes.android.external.store.base.impl.Store;
 import com.nytimes.android.external.store.base.impl.BarCode;
-import com.nytimes.android.external.store.base.impl.StoreBuilder;
-import com.nytimes.android.sample.BuildConfig;
+import com.nytimes.android.external.store.base.impl.Store;
 import com.nytimes.android.sample.R;
+import com.nytimes.android.sample.SampleApp;
 import com.nytimes.android.sample.data.model.Children;
-import com.nytimes.android.sample.data.model.GsonAdaptersModel;
 import com.nytimes.android.sample.data.model.Post;
 import com.nytimes.android.sample.data.model.RedditData;
-import com.nytimes.android.sample.data.remote.Api;
 import com.nytimes.android.sample.reddit.PostAdapter;
 
 import java.util.List;
 
-import retrofit2.GsonConverterFactory;
-import retrofit2.Retrofit;
-import retrofit2.RxJavaCallAdapterFactory;
 import rx.Observable;
 import rx.android.schedulers.AndroidSchedulers;
 import rx.schedulers.Schedulers;
@@ -38,6 +30,7 @@ public class StoreActivity extends AppCompatActivity {
 
     private RecyclerView recyclerView;
     private PostAdapter postAdapter;
+    private Store<RedditData, BarCode> nonPersistedStore;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
@@ -50,13 +43,18 @@ public class StoreActivity extends AppCompatActivity {
         layoutManager.setOrientation(LinearLayoutManager.VERTICAL);
         recyclerView.setLayoutManager(layoutManager);
         recyclerView.setAdapter(postAdapter);
+    }
 
-        loadPosts();
+    private void initStore() {
+        if (this.nonPersistedStore == null) {
+            this.nonPersistedStore = ((SampleApp) getApplicationContext()).getNonPersistedStore();
+        }
     }
 
     public void loadPosts() {
         BarCode awwRequest = new BarCode(RedditData.class.getSimpleName(), "aww");
-        provideRedditStore()
+
+        this.nonPersistedStore
                 .get(awwRequest)
                 .flatMap(this::sanitizeData)
                 .toList()
@@ -80,25 +78,10 @@ public class StoreActivity extends AppCompatActivity {
                 .map(Children::data);
     }
 
-    private Store<RedditData, BarCode> provideRedditStore() {
-        return StoreBuilder.<RedditData>barcode()
-                .fetcher(barCode -> provideRetrofit().fetchSubreddit(barCode.getKey(), "10"))
-                .open();
-    }
-
-    private Api provideRetrofit() {
-        return new Retrofit.Builder()
-                .baseUrl("http://reddit.com/")
-                .addConverterFactory(GsonConverterFactory.create(provideGson()))
-                .addCallAdapterFactory(RxJavaCallAdapterFactory.create())
-                .validateEagerly(BuildConfig.DEBUG)  // Fail early: check Retrofit configuration at creation time in Debug build.
-                .build()
-                .create(Api.class);
-    }
-
-    Gson provideGson() {
-        return new GsonBuilder()
-                .registerTypeAdapterFactory(new GsonAdaptersModel())
-                .create();
+    @Override
+    protected void onResume() {
+        super.onResume();
+        initStore();
+        loadPosts();
     }
 }