Remove setHandler in NetworkStatsService

Currently, internal handler is set by setHandler after
constructing NSS object. This was introduced in ag/866187 to
access the handler in the unit test.

However, the design put NSS in a bad situation where all classes
that need handler or executor could not be final and need to be
dynamically allocated in order to get a valid handler.

Thus, since the usage of handler is removed in previous patch,
this change eliminate setHandler by initializing the handler in
the constructor.

Test: atest FrameworksNetTests
Bug: 150664039

Change-Id: I794a24d00b0ca9fdc78091e7b9ab7307e0f034b7

tests/net/java/com/android/server/net/NetworkStatsServiceTest.java

@@ -64,6 +64,7 @@ import static org.mockito.Mockito.times;
 import static org.mockito.Mockito.verify;
 import static org.mockito.Mockito.when;
 
+import android.annotation.NonNull;
 import android.app.AlarmManager;
 import android.app.usage.NetworkStatsManager;
 import android.content.Context;
@@ -191,15 +192,11 @@ public class NetworkStatsServiceTest extends NetworkStatsBaseTest {
         PowerManager.WakeLock wakeLock =
                 powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, TAG);
 
-        mService = new NetworkStatsService(
-                mServiceContext, mNetManager, mAlarmManager, wakeLock, mClock,
-                mServiceContext.getSystemService(TelephonyManager.class), mSettings,
-                mStatsFactory, new NetworkStatsObservers(),  mStatsDir, getBaseDir(mStatsDir));
         mHandlerThread = new HandlerThread("HandlerThread");
-        mHandlerThread.start();
+        final NetworkStatsService.Dependencies deps = makeDependencies();
-        Handler.Callback callback = new NetworkStatsService.HandlerCallback(mService);
+        mService = new NetworkStatsService(mServiceContext, mNetManager, mAlarmManager, wakeLock,
-        final Handler handler = new Handler(mHandlerThread.getLooper(), callback);
+                mClock, mServiceContext.getSystemService(TelephonyManager.class), mSettings,
-        mService.setHandler(handler, callback);
+                mStatsFactory, new NetworkStatsObservers(), mStatsDir, getBaseDir(mStatsDir), deps);
 
         mElapsedRealtime = 0L;
 
@@ -221,6 +218,16 @@ public class NetworkStatsServiceTest extends NetworkStatsBaseTest {
         mNetworkObserver = networkObserver.getValue();
     }
 
+    @NonNull
+    private NetworkStatsService.Dependencies makeDependencies() {
+        return new NetworkStatsService.Dependencies() {
+            @Override
+            public HandlerThread makeHandlerThread() {
+                return mHandlerThread;
+            }
+        };
+    }
+
     @After
     public void tearDown() throws Exception {
         IoUtils.deleteContents(mStatsDir);
@@ -233,6 +240,8 @@ public class NetworkStatsServiceTest extends NetworkStatsBaseTest {
 
         mSession.close();
         mService = null;
+
+        mHandlerThread.quitSafely();
     }
 
     @Test