| /* |
| * Copyright 2018 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package androidx.room; |
| |
| import android.content.ComponentName; |
| import android.content.Context; |
| import android.content.Intent; |
| import android.content.ServiceConnection; |
| import android.os.IBinder; |
| import android.os.RemoteException; |
| import android.util.Log; |
| |
| import androidx.annotation.NonNull; |
| import androidx.annotation.Nullable; |
| |
| import java.util.Set; |
| import java.util.concurrent.Executor; |
| import java.util.concurrent.atomic.AtomicBoolean; |
| |
| /** |
| * Handles all the communication from {@link RoomDatabase} and {@link InvalidationTracker} to |
| * {@link MultiInstanceInvalidationService}. |
| */ |
| class MultiInstanceInvalidationClient { |
| |
| /** |
| * The application context. |
| */ |
| // synthetic access |
| @SuppressWarnings("WeakerAccess") |
| final Context mAppContext; |
| |
| /** |
| * The name of the database file. |
| */ |
| // synthetic access |
| @SuppressWarnings("WeakerAccess") |
| final String mName; |
| |
| /** |
| * The client ID assigned by {@link MultiInstanceInvalidationService}. |
| */ |
| // synthetic access |
| @SuppressWarnings("WeakerAccess") |
| int mClientId; |
| |
| // synthetic access |
| @SuppressWarnings("WeakerAccess") |
| final InvalidationTracker mInvalidationTracker; |
| |
| // synthetic access |
| @SuppressWarnings("WeakerAccess") |
| final InvalidationTracker.Observer mObserver; |
| |
| // synthetic access |
| @SuppressWarnings("WeakerAccess") |
| @Nullable |
| IMultiInstanceInvalidationService mService; |
| |
| // synthetic access |
| @SuppressWarnings("WeakerAccess") |
| final Executor mExecutor; |
| |
| // synthetic access |
| @SuppressWarnings("WeakerAccess") |
| final IMultiInstanceInvalidationCallback mCallback = |
| new IMultiInstanceInvalidationCallback.Stub() { |
| @Override |
| public void onInvalidation(final String[] tables) { |
| mExecutor.execute(new Runnable() { |
| @Override |
| public void run() { |
| mInvalidationTracker.notifyObserversByTableNames(tables); |
| } |
| }); |
| } |
| }; |
| |
| // synthetic access |
| @SuppressWarnings("WeakerAccess") |
| final AtomicBoolean mStopped = new AtomicBoolean(false); |
| |
| // synthetic access |
| @SuppressWarnings("WeakerAccess") |
| final ServiceConnection mServiceConnection = new ServiceConnection() { |
| |
| @Override |
| public void onServiceConnected(ComponentName name, IBinder service) { |
| mService = IMultiInstanceInvalidationService.Stub.asInterface(service); |
| mExecutor.execute(mSetUpRunnable); |
| } |
| |
| @Override |
| public void onServiceDisconnected(ComponentName name) { |
| mExecutor.execute(mRemoveObserverRunnable); |
| mService = null; |
| } |
| |
| }; |
| |
| // synthetic access |
| @SuppressWarnings("WeakerAccess") |
| final Runnable mSetUpRunnable = new Runnable() { |
| @Override |
| public void run() { |
| try { |
| final IMultiInstanceInvalidationService service = mService; |
| if (service != null) { |
| mClientId = service.registerCallback(mCallback, mName); |
| mInvalidationTracker.addObserver(mObserver); |
| } |
| } catch (RemoteException e) { |
| Log.w(Room.LOG_TAG, "Cannot register multi-instance invalidation callback", e); |
| } |
| } |
| }; |
| |
| // synthetic access |
| @SuppressWarnings("WeakerAccess") |
| final Runnable mRemoveObserverRunnable = new Runnable() { |
| @Override |
| public void run() { |
| mInvalidationTracker.removeObserver(mObserver); |
| } |
| }; |
| |
| private final Runnable mTearDownRunnable = new Runnable() { |
| @Override |
| public void run() { |
| mInvalidationTracker.removeObserver(mObserver); |
| try { |
| final IMultiInstanceInvalidationService service = mService; |
| if (service != null) { |
| service.unregisterCallback(mCallback, mClientId); |
| } |
| } catch (RemoteException e) { |
| Log.w(Room.LOG_TAG, "Cannot unregister multi-instance invalidation callback", e); |
| } |
| mAppContext.unbindService(mServiceConnection); |
| } |
| }; |
| |
| /** |
| * @param context The Context to be used for binding |
| * {@link IMultiInstanceInvalidationService}. |
| * @param name The name of the database file. |
| * @param invalidationTracker The {@link InvalidationTracker} |
| * @param executor The background executor. |
| */ |
| MultiInstanceInvalidationClient(Context context, String name, |
| InvalidationTracker invalidationTracker, Executor executor) { |
| mAppContext = context.getApplicationContext(); |
| mName = name; |
| mInvalidationTracker = invalidationTracker; |
| mExecutor = executor; |
| // Use all tables names for observer. |
| final Set<String> tableNames = invalidationTracker.mTableIdLookup.keySet(); |
| mObserver = new InvalidationTracker.Observer(tableNames.toArray(new String[0])) { |
| @Override |
| public void onInvalidated(@NonNull Set<String> tables) { |
| if (mStopped.get()) { |
| return; |
| } |
| try { |
| final IMultiInstanceInvalidationService service = mService; |
| if (service != null) { |
| service.broadcastInvalidation(mClientId, tables.toArray(new String[0])); |
| } |
| } catch (RemoteException e) { |
| Log.w(Room.LOG_TAG, "Cannot broadcast invalidation", e); |
| } |
| } |
| |
| @Override |
| boolean isRemote() { |
| return true; |
| } |
| }; |
| Intent intent = new Intent(mAppContext, MultiInstanceInvalidationService.class); |
| mAppContext.bindService(intent, mServiceConnection, Context.BIND_AUTO_CREATE); |
| } |
| |
| void stop() { |
| if (mStopped.compareAndSet(false, true)) { |
| mExecutor.execute(mTearDownRunnable); |
| } |
| } |
| } |