From 31fc64bec1c5286c27bdc1f683d037ae0e91418d Mon Sep 17 00:00:00 2001
From: Trygve Laugstøl <trygvis@inamo.no>
Date: Sun, 4 Jan 2015 21:04:18 +0100
Subject: o Adding a method to run a transaction in the BtService's database.

---
 .../main/java/io/trygvis/android/bt/BtService.java |  5 ++++
 .../io/trygvis/android/bt/DefaultBtService.java    | 34 ++++++++++++++--------
 2 files changed, 27 insertions(+), 12 deletions(-)

(limited to 'app/src/main/java/io/trygvis/android')

diff --git a/app/src/main/java/io/trygvis/android/bt/BtService.java b/app/src/main/java/io/trygvis/android/bt/BtService.java
index ca8bcd9..fb11027 100644
--- a/app/src/main/java/io/trygvis/android/bt/BtService.java
+++ b/app/src/main/java/io/trygvis/android/bt/BtService.java
@@ -4,9 +4,12 @@ import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
+import android.database.sqlite.SQLiteDatabase;
 
 import java.util.Collection;
 
+import io.trygvis.android.Function;
+
 public interface BtService<A extends BtDevice.BtDeviceWrapper<A>> {
 
     boolean initialize(BtDbIntegration<A> btDbIntegration);
@@ -27,6 +30,8 @@ public interface BtService<A extends BtDevice.BtDeviceWrapper<A>> {
 
     Collection<A> getTags();
 
+    <T> T runTx(Function<SQLiteDatabase, T> action);
+
     public static interface BtDbIntegration<A extends BtDevice.BtDeviceWrapper<A>> {
         A createTag(BtDevice<A> a);
     }
diff --git a/app/src/main/java/io/trygvis/android/bt/DefaultBtService.java b/app/src/main/java/io/trygvis/android/bt/DefaultBtService.java
index 3c14c1f..205421b 100644
--- a/app/src/main/java/io/trygvis/android/bt/DefaultBtService.java
+++ b/app/src/main/java/io/trygvis/android/bt/DefaultBtService.java
@@ -26,6 +26,7 @@ import java.util.Date;
 import java.util.HashSet;
 import java.util.Set;
 
+import io.trygvis.android.Function;
 import io.trygvis.android.LocalBinder;
 import io.trygvis.soilmoisture.R;
 
@@ -160,6 +161,23 @@ public class DefaultBtService<A extends BtDevice.BtDeviceWrapper<A>> extends Ser
         return tags;
     }
 
+    @Override
+    public <T> T runTx(Function<SQLiteDatabase, T> action) {
+        SQLiteDatabase db = openBtDevices();
+        try {
+            db.beginTransaction();
+
+            T value = action.apply(db);
+
+            db.setTransactionSuccessful();
+
+            return value;
+        } finally {
+            db.endTransaction();
+            db.close();
+        }
+    }
+
     // -----------------------------------------------------------------------
     // Scanning
     // -----------------------------------------------------------------------
@@ -244,10 +262,7 @@ public class DefaultBtService<A extends BtDevice.BtDeviceWrapper<A>> extends Ser
 
         long now = System.currentTimeMillis();
 
-        SQLiteDatabase db = openBtDevices();
-        try {
-            db.beginTransaction();
-
+        btDevice = runTx(db -> {
             Cursor cursor = db.query("bt_device", new String[]{"id", "first_seen"}, "address=?",
                     new String[]{address}, null, null, null);
 
@@ -273,15 +288,10 @@ public class DefaultBtService<A extends BtDevice.BtDeviceWrapper<A>> extends Ser
             }
 
             Log.i(TAG, "New device: " + address + ", seenBefore=" + seenBefore);
-            btDevice = new BtDevice<>(this, bluetoothDevice, btDbIntegration, id, rssi, scanResult,
-                    seenBefore, firstSeen, lastSeen);
-
             cursor.close();
-            db.setTransactionSuccessful();
-        } finally {
-            db.endTransaction();
-            db.close();
-        }
+            return new BtDevice<>(this, bluetoothDevice, btDbIntegration, id, rssi, scanResult,
+                    seenBefore, firstSeen, lastSeen);
+        });
 
         devices.add(btDevice);
 
-- 
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