From e7ce5c669e03b1c89a83416834e858398e39b31f Mon Sep 17 00:00:00 2001
From: ByteHamster <info@bytehamster.com>
Date: Sat, 7 Apr 2018 16:21:57 +0200
Subject: [PATCH] Using Bill Pugh Singleton Implementation

---
 .../antennapod/core/storage/PodDBAdapter.java  | 18 +++++++-----------
 1 file changed, 7 insertions(+), 11 deletions(-)

diff --git a/core/src/main/java/de/danoeh/antennapod/core/storage/PodDBAdapter.java b/core/src/main/java/de/danoeh/antennapod/core/storage/PodDBAdapter.java
index 99f5a466f..e82252310 100644
--- a/core/src/main/java/de/danoeh/antennapod/core/storage/PodDBAdapter.java
+++ b/core/src/main/java/de/danoeh/antennapod/core/storage/PodDBAdapter.java
@@ -308,26 +308,22 @@ public class PodDBAdapter {
             KEY_CONTENT_ENCODED, KEY_FEED};
 
     private static Context context;
-    private static PodDBHelper dbHelper;
 
     private static volatile SQLiteDatabase db;
     private static int counter = 0;
-    private static PodDBAdapter instance;
 
     public static void init(Context context) {
         PodDBAdapter.context = context.getApplicationContext();
     }
 
-    private static class PodDBHelperholder {
-        public static final PodDBHelper dbHelper = new PodDBHelper(PodDBAdapter.context, DATABASE_NAME, null);
+    // Bill Pugh Singleton Implementation
+    private static class SingletonHolder {
+        private static final PodDBHelper dbHelper = new PodDBHelper(PodDBAdapter.context, DATABASE_NAME, null);
+        private static final PodDBAdapter dbAdapter = new PodDBAdapter();
     }
 
     public static PodDBAdapter getInstance() {
-        if (instance == null) {
-            instance = new PodDBAdapter();
-        }
-        dbHelper = PodDBHelperholder.dbHelper;
-        return instance;
+        return SingletonHolder.dbAdapter;
     }
 
     private PodDBAdapter() {
@@ -346,11 +342,11 @@ public class PodDBAdapter {
     private SQLiteDatabase openDb() {
         SQLiteDatabase newDb;
         try {
-            newDb = dbHelper.getWritableDatabase();
+            newDb = SingletonHolder.dbHelper.getWritableDatabase();
             newDb.enableWriteAheadLogging();
         } catch (SQLException ex) {
             Log.e(TAG, Log.getStackTraceString(ex));
-            newDb = dbHelper.getReadableDatabase();
+            newDb = SingletonHolder.dbHelper.getReadableDatabase();
         }
         return newDb;
     }